35d3-3-79-1_Test.pdf

16. Install primary cup (7, Figure 7-24, Sheet 1 continued) and cup protector (10).

17. Install piston assembly (9) and stop plate (8).

18. Depress the stop plate (8) and install lock ring (7).

19. Service the master cylinder housing (17) with hydrau-lic fluid (No. 4, Table 2-3) or equivalent.

20. Open the bleeder screw (20).

21. Depress the piston assembly (9) and observe fluid coming out of the bleeder screw (20).

22. If air bubbles are observed, repeat step 21 until clear fluid comes out of the bleeder screw (20).

23. Close bleeder screw (20).

5-432. TESTING.

5-433. FUNCTIONAL TEST

PREPARATION.

NOTE

When a functional test is required, the following paragraphs must be accomplished in sequence.

1. Engage all handbrakes.

2. Clear area beneath lift trailer.

5-434. RAIL MOVEMENTS FUNCTIONAL TEST.

NOTE

Ensure lift trailer is on a smooth flat surface.

1. Operate lift trailer. Refer to paragraph 4-98.

w Load limit set on control pendant must always be above actual load before pressing RESET button.

Failure to set load limit on the control pendant will cause injury to personnel and damage to equip-ment.

NOTE

Two persons are required to perform this task.

Person (A) operates pendant and person (B) is on top of lift trailer.

2. Press LOAD LIMIT switch until pendant displays 17,500.

3. Press RESET button.

4. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 to 10 inches off the floor.

5. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

6. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

7. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

8. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

5-435. AXIAL MOVEMENT. Perform axial movement functional test as follows:

NOTE

Above 57 inches rail height, axial movement travel is 6 ± 0.5 inches.

1. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until the lift trailer reaches a rail height of 120 inches.

2. Using the AXIAL/ROLL joystick and TRAILER FWD END and TRAILER AFT END joysticks center the rails in the axial, lateral, and roll axis using the centering index marks on the lift trailer.

3. Set the AXIAL/ROLL joystick in the FWD position moving the rails in an axial direction to ensure 5 ± 0.5 inches of travel from center.

TO 35D3-3-79-1

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4. Set the AXIAL/ROLL joystick to the AFT position moving the rails to ensure 5 ± 0.5 inches of travel from center.

5. Center the rails back to the centering index marks.

5-436. LATERAL MOVEMENT. Perform lateral movement functional test as follows:

w Between rail heights of 58 to 96 inches the lift trailer upper platform must be centered. Failure to comply may result in damage to equipment.

NOTE

Lateral movement travel is 5 ± 0.5 inches from centering index marks.

1. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until the lift trailer reaches a rail height of 120 inches.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks to the LH position to ensure 5 ± 0.5 inches of travel from center at AFT end.

3. Set the TRAILER FWD END and TRAILER AFT END joysticks to the RH position to ensure 5 ± 0.5 inches of travel from center at AFT end.

4. Set the TRAILER FWD END and TRAILER AFT END joysticks to the LH position to ensure 5 ± 0.5 inches of travel at FWD end.

5. Set the TRAILER FWD END and TRAILER AFT END joysticks to the RH position to ensure 5 ± 0.5 inches of travel from center at FWD end.

6. Center the rails back to the centering index marks.

5-437. YAW MOVEMENT. Perform yaw movement functional test as follows:

NOTE

Yaw movement travel is 5 ± 0.5 inches from centering index marks.

1. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until the lift trailer reaches a rail height of 120 inches.

2. Set the TRAILER FWD END joystick to the LH position to ensure 5 ± 0.5 inches of travel from center.

3. Set the TRAILER FWD END joystick to the RH position to ensure 5 ± 0.5 inches of travel from center.

4. Center the rails back to the centering index marks.

5. Set the TRAILER AFT END joystick to the LH position to ensure 5 ± 0.5 inches of travel from center.

6. Set the TRAILER AFT END joystick to the RH position to ensure 5 ± 0.5 inches of travel from center.

7. Center the rails back to the centering index marks.

5-438. ROLL MOVEMENT. Perform roll movement functional test as follows:

NOTE

Roll movement travel range is ± 5 degrees from centering index marks.

1. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until the lift trailer reaches a rail height of 120 inches.

2. Position a straight, rigid bar across the rails.

3. Place an inclinometer (refer to Table 2-1) on the bar.

4. Record the roll angle.

NOTE

• The clock wise and counterclockwise markings are looking down the main shaft centerline.

• To ensure accurate calibration, upper frame assembly must be free of all maintenance equipment and personnel prior to adjustments.

5. Set the AXIAL/ROLL joystick in the CW position to ensure 5 ± 1 degrees of travel from center.

6. Set the AXIAL/ROLL joystick in the CCW position to ensure 5 ± 1 degrees of travel from center.

7. Center the rails back to the centering index marks.

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8. Remove the inclinometer (refer to Table 2-1) and bar from the rails.

5-439. PITCH MOVEMENT. Perform pitch movement functional test as follows:

NOTE

Pitch movement travel range is ± 5 degrees from centering index marks.

1. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until the lift trailer reaches a rail height of 120 inches.

2. Position an inclinometer (refer to Table 2-1) on the I-beam rail.

3. Record the pitch angle.

4. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP or DOWN positions until the inclinometer reads zero.

5. Set TRAILER FWD END joystick in the DOWN position to ensure a minimum 5 degrees of travel from recorded pitch angle

6. Set TRAILER AFT END joystick in the DOWN position to ensure a minimum 5 degrees of travel from recorded pitch angle

7. Center the rails back to the centering index marks.

8. Remove inclinometer (refer to Table 2-1) from the I-beam rails.

9. Perform power down procedure. Refer to paragraph 4-93.

10. Remove engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

5-440. LIFTING MECHANISM

FUNCTIONAL TEST.

NOTE

Ensure lift trailer is on a smooth flat surface.

1. Operate lift trailer. Refer to paragraph 4-98.

w Load limit set on control pendant must always be above actual load before pressing RESET button.

Failure to set load limit on the control pendant will cause injury to personnel and damage to equip-ment.

NOTE

Two persons are required to perform this task.

Person (A) operates pendant and person (B) is on top of lift trailer.

2. Press LOAD LIMIT switch until pendant displays 17,500.

3. Press RESET button.

4. Perform set up and positioning. Refer to paragraph 4-89.

5. Measure the distance from the top of the I-beam rail to the ground.

6. Set SPEED setting on control pendant to LOW.

7. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to maximum extension.

8. Observe the stabilizing pads extend smoothly and do not bind during operation.

NOTE

Average lift speed is 4 to 5 inches per minute and maximum rail height shall be 148 inches.

9. Measure and record the time required to reach maxi-mum height using calibrated stop watch and tape measure.

10. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 to 10 inches off the floor.

11. Observe the stabilizing pads retract smoothly and do not bind during operation.

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NOTE

Average lowering speed is between 4 to 5 inches per minute and minimum rail height shall be 54 inches.

12. Measure and record the time required to reach mini-mum height using calibrated stop watch and tape measure.

13. Set SPEED switch on pendant to HIGH.

14. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise lift trailer to maximum extension.

15. Observe the stabilization pad extends smoothly with-out binding during retraction.

NOTE

Average lift speed is between 14 to 30 inches per minute and maximum rail height shall be 148 inches.

16. Measure and record the time required to reach maxi-mum height using calibrated stop watch and tape measure.

17. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 to 10 inches off the floor.

18. Observe the stabilizing pads retract smoothly and do not bind during operation.

NOTE

Average lowering speed is between 14 to 30 inches per minute and minimum rail height shall be 54 inches.

19. Measure and record the time required to reach mini-mum height using calibrated stop watch and tape measure.

20. Raise lift trailer to a minimum of 57 inches of rail height; ensure all foot pads are extended and making solid contact with the ground.

21. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

22. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

23. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

24. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

25. Measure the distance from the top of the I-beam rail to the ground.

26. Set SPEED setting on control pendant to LOW.

27. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to maximum extension.

NOTE

Average lift speed is 4 to 5 inches per minute and maximum rail height shall be 148 inches.

28. Measure and record the time required to reach maxi-mum height using calibrated stop watch and tape measure.

NOTE

Average lowering speed is 4 to 5 inches per minute and maximum rail height shall be 148 inches.

29. Lower lift trailer to 57 inches rail height.

30. Measure and record the time required to reach mini-mum height using calibrated stop watch and tape measure.

31. Set SPEED switch on pendant to HIGH.

32. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise lift trailer to maximum extension.

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Average lift speed is 14 to 30 inches per minute and maximum rail height shall be 148 inches.

33. Measure and record the time required to reach maxi-mum height using calibrated stop watch and tape measure.

NOTE

Average lowering speed is 14 to 30 inches per minute and maximum rail height shall be 148 inches.

34. Lower lift trailer to rail height of 57 inches.

35. Measure and record the time required to reach mini-mum height using calibrated stop watch and tape measure.

36. Perform power down procedure. Refer to paragraph 4-93.

37. Remove engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

5-441. LIFTING/STABILIZING PADS

FUNCTIONAL TEST.

1. Perform lifting mechanism functional test. Refer to paragraph 5-439.

2. Observe the extension of the pads during lift mecha-nism testing.

3. Observe the retraction of the pads during lift mecha-nism testing.

5-442. RAIL DRIVER LOAD LIMITING

FUNCTIONAL TEST.

1. Operate lift trailer. Refer to paragraph 4-98.

w Load limit set on control pendant must always be above actual load before pressing RESET button.

Failure to set load limit on the control pendant will cause injury to personnel and damage to equip-ment.

NOTE

Two persons are required to perform this task.

Person (A) operates pendant and person (B) is on top of lift trailer.

2. Press LOAD LIMIT switch until pendant displays 17,500.

3. Press RESET button.

4. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 57 inches rail height.

5. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

6. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

7. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

8. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

9. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 120 inches rail height.

5-443. AXIAL LOAD.

5-444. Perform the axial load functional test as follows:

1. Wrap chain around center of engine and cradle mounted dummy load fixture (No. 3, Table 2-1) parallel with rails using shoring where chain contacts fixture.

2. Position forklift at trailer AFT end and raise forks to a height even with CG of fixture.

3. Attach chain to fixed point on forklift even with fixture

CG.

4. Install dial tensiometer (refer to Table 2-1) between forklift and fixture.

5. Remove slack from chains.

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6. Zero tensiometer.

7. Set AXIAL/ROLL joystick to FWD position.

8. Move lift trailer forward direction until alarm emits a slow intermittent tone.

9. Press RESET; alarm ends.

w Peak load shall not exceed 2000 pounds.

10. Continue lift trailer forward until movement ceases or tensiometer reads 2000 pounds.

11. When movement ceases observe tensiometer.

• Tensiometer shall read 1500 to 2000 pounds.

12. Position forklift at lift trailer forward end and raise forks to a height even with CG of fixture.

13. Attach chain to fixed point on forklift even with fixture

CG.

14. Install dial tensiometer (refer to Table 2-1) between forklift and fixture.

15. Remove slack from chains.

16. Zero tensiometer.

17. Set AXIAL/ROLL joystick to FWD position.

18. Move lift trailer AFT direction until alarm emits a slow intermittent tone.

19. Press RESET; alarm ends.

w Peak load shall not exceed 2000 pounds.

20. Continue forward until movement ceases or tensiom-eter reads 2000 pounds.

21. When movement ceases observe tensiometer.

• Tensiometer shall read 1500 to 2000 pounds.

5-445. LATERAL LOAD.

5-446. Perform the lateral load functional test as follows:

1. Wrap chain around center of engine and cradle mounted dummy load fixture (No. 3, Table 2-1) parallel with rails using shoring where chain contacts fixture.

2. Position forklift at lift trailer left side end and raise forks to a height even with CG of fixture.

3. Attach chain to fixed point on forklift even with fixture

CG.

4. Install dial tensiometer (refer to Table 2-1) between forklift and fixture.

5. Remove slack from chains.

6. Zero tensiometer.

7. Set TRAILER FWD END and TRAILER AFT END joysticks to RH position.

8. Move lift trailer RH direction until alarm emits a slow intermittent tone.

9. Press RESET; alarm ends.

w Peak load shall not exceed 2000 pounds.

10. Continue RH until movement ceases or tensiometer reads 2000 pounds.

11. When movement ceases observe tensiometer.

• Tensiometer shall read 1500 to 2000 pounds.

12. Position forklift at lift trailer right side and raise forks to a height even with CG of fixture.

13. Attach chain to fixed point on forklift even with fixture

CG.

14. Install dial tensiometer (refer to Table 2-1) between forklift and fixture.

15. Remove slack from chains.

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16. Zero tensiometer.

17. Set TRAILER FWD END and TRAILER AFT END joysticks to LH position.

18. Move lift trailer LH direction until alarm emits a slow intermittent tone.

19. Press RESET; alarm ends.

w Peak load shall not exceed 2000 pounds.

20. Continue LH until movement ceases or tensiometer reads 2000 pounds.

21. When movement ceases observe tensiometer.

• Tensiometer shall read 1500 to 2000 pounds.

5-447. ROLL.

5-448. Perform the roll functional test as follows:

1. Wrap chain around right side center of engine and cradle mounted dummy load fixture (No. 3, Table 2-1) using shoring where chain contacts fixture.

2. Route chain over top of fixture; ensure chain is centered on fixture.

3. Attach chain to left side center frame even with fixture

CG.

4. Install dial tensiometer (refer to Table 2-1) between fixture chain and chain on center frame.

5. Remove slack from chains.

6. Zero tensiometer.

7. Set AXIAL/ROLL joystick to CW position.

8. Move trailer CW direction until alarm emits a slow intermittent tone.

9. Press RESET; alarm ends.

w Peak load shall not exceed 1000 pounds.

10. Continue CW until movement ceases or tensiometer reads 1000 pounds.

11. When movement ceases observe tensiometer.

• Tensiometer shall read 750 to 1000 pounds.

12. Wrap chain around left side center of engine and cradle mounted dummy load fixture (No. 3, Table 2-1) using shoring where chain contacts fixture.

13. Route chain over top of fixture; ensure chain is centered on fixture.

14. Attach chain to right side center frame even with fixture CG.

15. Install dial tensiometer (refer to Table 2-1) between fixture chain and chain on center frame.

16. Remove slack from chains.

17. Zero tensiometer.

18. Set AXIAL/ROLL joystick to CCW position.

19. Move trailer CCW direction until alarm emits a slow intermittent tone.

20. Press RESET; alarm ends.

w Peak load shall not exceed 1000 pounds.

21. Continue CCW until movement ceases or tensiometer reads 1000 pounds.

22. When movement ceases observe tensiometer.

• Tensiometer shall read 750 to 1000 pounds.

5-449. HYDRAULIC MAINTENANCE

PLATFORM ASSEMBLY FUNCTIONAL

TEST.

5-450. Perform the hydraulic maintenance platform as-sembly functional test as follows:

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1. Operate lift trailer. Refer to paragraph 4-98.

2. Perform setup and positioning. Refer to paragraph 4-89.

3. Pull pin on aft lateral end work platform assembly.

4. Slide lockbar and swing AFT lateral end work plat-form out.

5. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 60 inches rail height.

6. Press PLATFORM UP switch on control pendant.

7. Verify the hydraulic maintenance platform assembly extends throughout its full length of travel.

8. Press the PLATFORM DOWN switch.

9. Verify the hydraulic maintenance platform assembly retracts throughout its full length of travel.

10. Perform power down procedure. Refer to paragraph 4-93.

5-451. WEIGHING SYSTEM

FUNCTIONAL TEST.

5-452. Perform the weighing system functional test as follows:

1. Operate lift trailer. Refer to paragraph 4-98.

2. Ensure lift trailer is in lowered position.

3. Set control pendant NULL switch to CG position and observe weight indicated on pendant is less than 250 pounds.

4. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 60 inches rail height.

5. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

6. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

7. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

8. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

NOTE

Weight of dummy load fixture is approximately 14,000 pounds.

9. Record the weight of the dummy load fixture indicated on the control pendant.

10. Set pendant NULL switch to LOAD position and observe weight indicated on pendant is less than 250 pounds.

11. Press LOAD LIMIT switch on pendant and set load limit to 17,500 pounds.

12. Remove engine and cradle mounted dummy load fixture (No. 3, Table 2-1) from lift trailer.

13. Perform power down procedure. Refer to paragraph 4-93.

5-453. OVERLOAD REVERSAL SYSTEM

FUNCTIONAL TEST.

5-454. Perform the overload reversal system functional test as follows:

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 57 inches rail height.

3. Press LOAD LIMIT switch on pendant and set load limit to 17,500 pounds.

4. Press RESET button.

5. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

6. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

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7. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

8. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

9. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 120 inches rail height.

10. Press EMERGENCY STOP button; trailer movement stops and alarm continues to sound.

11. Press LOAD LIMIT switch until 17,500 is displayed.

12. Press RESET button; alarm stops.

5-455. OUT OF BALANCE ALARM

FUNCTIONAL TEST.

5-456. Perform the out of balance functional test as follows:

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 57 inches rail height.

3. Ensure rail stops are up and locked.

4. Press LOAD LIMIT switch on pendant and set load limit to 17,500 pounds.

5. Press RESET button.

6. A four-leg chain sling with grab hooks (No. 4, Table 2-1) (or equivalent) is required to lift the dummy load unto the trailer. Each leg of the sling has to be adjusted to 13 feet.

7. Attach four-leg chain sling with grab hooks (No. 4, Table 2-1) to dummy load fixture rails (No. 3, Table 2-1).

8. Position the chain angle as measured between the load and the chain leg shall be 60 ±3 degrees using the digital protractor (refer to Table 2-2).

9. Install engine and cradle mounted dummy load fixture (No. 3, Table 2-1) on lift trailer.

10. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 120 inches rail height.

11. Wrap chain around upper rail AFT of left AFT load cell.

12. Wrap chain through left aft tie down ring on torsion link (57, Figure 7-1, Sheet 8).

13. Install tensiometer (refer to Table 2-1) between chains and remove slack.

14. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer.

NOTE

At 700 to 750 pounds a slow intermittent beep will be heard and a LED display will be displayed out of bounds on the control pendant box. Alarm can be silenced by pressing RESET button.

15. Ensure alarm sounds and lift trailer movement stops at 1800 to 2200 pounds.

NOTE

Corner that is chained must be lower within five seconds of pressing RESET button.

16. Press RESET button.

17. Set the TRAILER FWD END and TRAILER AFT END joysticks to the DOWN position and lower the lift trailer.

• Alarm silences and tensiometer reads 0.

18. Remove engine and cradle mounted dummy load fixture (No. 3, Table 2-1) from lift trailer.

19. Perform power down procedure. Refer to paragraph 4-93.

5-457. NEGATIVE LOAD FUNCTIONAL

TEST.

5-458. Perform the negative load functional test as fol-lows:

1. Operate lift trailer. Refer to paragraph 4-98.

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2. Perform setup and positioning. Refer to paragraph 4-89.

3. Press LOAD LIMIT switch on pendant and set load limit to 17,500 pounds.

4. Press RESET button.

5. Wrap chain around overhead hoist.

6. Wrap chain around upper rails at center of lift trailer.

7. Install tensiometer (refer to Table 2-1) between chains and remove slack.

8. Set the TRAILER FWD END and TRAILER AFT END joysticks to the DOWN position and lower the lift trailer.

9. Ensure lift trailer movement stops.

10. Perform power down procedure. Refer to paragraph 4-93.

5-459. CALIBRATION OF T0001 THRU

T0004.

5-460. Perform calibration of t0001 thru t0004 as follows (see Figure 7-20 and refer to Table 5-65):

1. Operate lift trailer. Refer to paragraph 4-98.

2. Perform setup and positioning. Refer to paragraph 4-86.

3. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the lift trailer to 101 ± 2 inches rail height.

4. Press EMERGENCY STOP button.

5. Remove four bolts securing cover on load cell amp junction box.

NOTE

• By pressing the BUILT IN TEST button, you put the control pendant in a mode where all buttons have completely different functions. To exit Built In Test (BIT) mode, the RESET button may be pressed.

• Do not operate any controls on the control pendant while in BIT mode.

6. Press the BUILT IN TEST button and hold it until the display reads “t0001” then release the button.

NOTE

• The operator is in BIT mode and on channel 1.

The value should read 4300 ± 1 which is actually the ‘‘zero” mode. Channels “t0001” thru “t0004” are used for calibrating the load cells.

• Turning load cell potentiometers CW increases value and CCW decreases value.

7. Adjust R14 on load cell amp CCA to achieve 4300 ± 1 reading on pendant.

8. Press BUILT IN TEST switch until t0002 is displayed.

9. Adjust R26 on load cell amp CCA to achieve 4300 ± 1 reading on pendant.

10. Press BUILT IN TEST switch until t0003 is displayed.

11. Adjust R34 on load cell amp CCA to achieve 4300 ± 1 reading on pendant.

12. Press BUILT IN TEST switch until t0004 is displayed.

13. Adjust R42 on load cell amp CCA to achieve 4300 ± 1 reading on pendant.

14. Press RESET to exit BIT mode.

15. Install cover and secure with four bolts on load cell amp junction box.

16. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 inches off the floor.

17. Perform power down procedure. Refer to paragraph 4-93.

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Table 5-66. BIT Operations Calibration Table

BIT Channel Desired Value Function t0001 4300 * Ensure that load cell 1 (FWD LEFT) is operating properly t0002 4300 * Ensure that load cell 2 (FWD RIGHT) is operating properly t0003 4300 * Ensure that load cell 3 (AFT RIGHT) is operating properly t0004 4300 * Ensure that load cell 4 (AFT LEFT) is operating properly t0005 4300 **

(at lower limit=9 inches off floor) 7100 ± 100 **

(at upper limit=148 inches rail height)

Displays and allows setting of FWD limit of travel of lift trailer for both the upper and lower limits BIT Operations

Calibration Table

BIT Channel Desired Value Function t0006 4300 **

(at lower limit=9 inches off floor) 7100 ± 100 **

(at upper limit=148 inches rail height)

Displays and allows setting of AFT limit of travel of lift trailer for both the upper and lower limits t0007 4300 ± 5 * FWD lower limit check t0008 4300 ± 5 * AFT lower limit check t0009 7100 ± 100 * FWD upper limit check t0010 7100 ± 100 * AFT upper limit check t0011 See Table 5-66 for main pendant and 5-67 for remote pendant

Pendant switch verification test t0012 Alternating t9876 and t6789 Pendant cable self-test and display test t0013 4450 ± 50 * FWD off-center limit check t0014 4450 ± 50 * AFT off-center limit check

* At 0 pounds, 1 volt, and 101 inch rail height (Value increases incrementally with weight)

** At 1 volt (Value increases and decreases incrementally with movement)

5-461. CALIBRATION OF LOWER

LIMITS FOR T0005, T0006, T0007, AND

T0008.

5-462. Perform calibration of lower limits for t0005, t0006, t0007, and t0008 as follows (see Figure 7-20 and refer to Table 5-65):

1. Operate lift trailer. Refer to paragraph 4-98.

2. Perform setup and positioning. Refer to paragraph 4-89.

3. Set TRAILER FWD END and TRAILER AFT END joysticks to UP position and raise lift trailer to 57 inches rail height.

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4. Ensure tires are inflated to 70 to 80 pounds.

5. Stow support pads on forward and aft rails.

NOTE

MAINTENANCE ENABLE will remain engaged for 5 minutes maximum. If trailer stops operating, the MAINTENANCE ENABLE switch may re-quire activation.

6. Momentarily activate MAINTENANCE ENABLE switch and release.

7. Set TRAILER FWD END joystick in DOWN position until the fwd rails are fully retracted and fwd foot pads are off the floor.

8. Press BUILT IN TEST button until t0005 is displayed to set lower limit of forward feet.

9. Press and hold PLATFORM DOWN pushbutton to override forward lower limit setting.

10. Toggle FORWARD UP/DOWN joystick to position foot pads 8 inches from the floor.

11. Press BUILD IN TEST button to enter new setting.

• Reading shall be 4300 ± 50.

12. Release PLATFORM DOWN pushbutton and BUILT IN TEST button to secure setting and record.

13. Press BUILT IN TEST button until t0007 is displayed.

14. Compare t0005 reading to t0007 reading.

• Readings shall be ± 5.

• If readings are not ± 5, repeat steps 7 thru 14.

15. Press BUILT IN TEST button until t0006 is displayed to set lower limit of aft feet.

16. Press and hold PLATFORM DOWN button to over-ride aft lower limit setting.

17. Toggle AFT UP/DOWN joystick to position foot pads 8 inches from the floor.

18. Press BUILT IN TEST button to enter new setting.

• Reading shall be 4300 ± 50.

19. Release PLATFORM DOWN and BUILT IN TEST buttons to secure setting and record.

20. Press BUILT IN TEST button until t0008 is displayed.

21. Compare t0006 reading to t0008 reading.

• Readings shall be ± 5.

• If readings are not ± 5, repeat steps 15 thru 21.

22. Press RESET pushbutton to exit built in test.

23. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP positions until the foot pads touch the floor.

24. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN position until the rails are fully retracted and foot pads are eight to ten inches off the floor.

25. Press BUILT IN TEST button until t00005 is dis-played.

• If reading is not 4300 ± 50, adjust fwd and aft transmission potentiometers. Refer to para-graph 5-252.

26. Press BUILT IN TEST button until t0006 is displayed.

• If reading is not 4300 ± 50, adjust fwd and aft transmission potentiometers. Refer to para-graph 5-252.

27. Press BUILT IN TEST button until t0007 is displayed.

• Reading shall be 4300 ± 5 of t0005.

28. Press BUILT IN TEST button until t0008 is displayed.

• Reading shall be 4300 ± 5 of t0006

29. Press RESET pushbutton to exit built in test.

30. Coat mating surface of duct (119, Figure 7-20, Sheet

3) with technical petrolatum (No. 28, Table 2-3) and close lid of enclosure (143, Sheet 1).

31. Install 40 washers (3) and 40 bolts (2) securing lid of enclosure (143) to bottom of enclosure (143). Torque bolts to 312 to 336 in-lb.

32. Operate lift trailer. Refer to paragraph 4-98.

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33. Perform power down procedure. Refer to paragraph 4-93.

5-463. CALIBRATION OF UPPER LIMITS

FOR T0005, T0006, T0009, AND T0010.

5-464. Perform calibration of upper limits for t0005, t0006, t0009, and t0010 as follows (see Figure 7-20 and refer to Table 5-65):

1. Operate lift trailer. Refer to paragraph 4-98.

2. Perform setup and positioning. Refer to paragraph 4-89.

3. Set TRAILER FWD END and TRAILER AFT END joysticks to UP position and raise lift trailer to upper most limits.

NOTE

MAINTENANCE ENABLE will remain engaged for 5 minutes maximum. If trailer stops operating, the MAINTENANCE ENABLE switch may re-quire activation.

4. Momentarily activate MAINTENANCE ENABLE switch and release.

NOTE

By pressing the BUILT IN TEST button, the control pendant is in a mode where all buttons have completely different functions. To exit built in test mode, the RESET button may be pressed.

5. Press BUILT IN TEST button until t0005 is displayed.

6. Press and hold PLATFORM UP button.

7. Toggle FORWARD UP/DOWN joystick to position forward I-beam rails 148 inches from the floor.

8. Press BUILT IN TEST button to enter new setting and record.

9. Release BUILT IN TEST and PLATFORM UP but-tons.

• Reading shall be 7100 ± 100.

10. Press BUILT IN TEST button until t0009 is displayed.

11. Compare t0005 reading to t0009 reading.

• Readings should read within 5.

• If readings are not within 5, repeat steps 6 thru 12.

12. Press BUILT IN TEST button until t0006 is displayed.

13. Press and hold PLATFORM UP button.

14. Toggle AFT UP/DOWN joystick to position aft I-beam rails 148 inches from the floor.

15. Press BUILT IN TEST button to enter new setting and record.

16. Release BUILT IN TEST and PLATFORM UP but-tons.

• Reading shall be 7100 ± 100.

17. Press BUILT IN TEST button until t0010 is displayed.

18. Compare t0006 reading to t0010 reading.

• Readings should read within 5.

• If readings are not within 5, repeat steps 13 thru 18.

19. Press RESET button to exit built in test.

20. Set TRAILER FWD END and TRAILER AFT END joysticks to DOWN positions until the rails are fully retracted and foot pads are 8 inches off the floor.

21. Operate lift trailer. Refer to paragraph 4-98.

22. Perform power down procedure. Refer to paragraph 4-93.

5-465. CALIBRATION OF OFF CENTER

LIMITS FOR T0013 AND T0014.

5-466. Perform calibration of off center limits for t0013 and t0014 as follows (see Figure 7-20 and refer to Table 5-65):

1. Operate lift trailer. Refer to paragraph 4-98.

2. Perform setup and positioning. Refer to paragraph 4-89.

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3. Set TRAILER FWD END and TRAILER AFT END joysticks to UP position and raise lift trailer to 57 ± 1 inches rail height.

NOTE

MAINTENANCE ENABLE will remain engaged for 5 minutes. If trailer stops operating, the MAIN- TENANCE ENABLE switch may require activa-tion.

4. Momentarily activate MAINTENANCE ENABLE switch and release.

NOTE

By pressing the BUILT IN TEST button, the control pendant is in a mode where all buttons have completely different functions. To exit built in test mode, the RESET button may be pressed.

5. Press BUILT IN TEST button until t0013 is displayed.

6. Press and hold PLATFORM UP button.

7. Press BUILT IN TEST button to enter new setting and record.

8. Release BUILT IN TEST and PLATFORM UP buttons to set forward off center limit.

• Reading shall be 4450 ± 50.

9. Press BUILT IN TEST button until t0014 is displayed.

10. Press and hold PLATFORM UP button.

11. Press BUILT IN TEST button to enter new setting and record.

12. Release BUILT IN TEST and PLATFORM UP buttons to set aft off center limit.

• Reading shall be 4450 ± 50.

13. Press RESET button to exit built in test.

14. Position FORWARD UP/DOWN and AFT UP/DOWN joysticks UP and raise upper frame ap-proximately 2 inches.

15. Position AXIAL/ROLL joystick FWD to move upper frame forward approximately 2 inches.

16. Position FORWARD UP/DOWN and AFT UP/DOWN joysticks DOWN until movement stops.

17. Press BUILT IN TEST button until t0013 is displayed.

• Reading is within 15 of recorded reading in step 7.

• If reading is not within 15, repeat steps 5 thru 17.

18. Press BUILT IN TEST button until t0014 is displayed.

• Reading is within 15 of recorded reading in step 11.

• If reading is not within 15, repeat steps 5 thru 18.

19. Press RESET button to exit built in test.

20. Position FORWARD UP/DOWN and AFT UP/DOWN joysticks UP and raise upper frame ap-proximately 2 inches.

21. Position AXIAL/ROLL joystick AFT and center the upper frame.

22. Position TRAILER FWD END and TRAILER AFT END joysticks to DOWN position until the rails are fully retracted and foot pads are 8 inches off the floor.

23. Operate lift trailer. Refer to paragraph 4-98.

24. Perform power down procedure. Refer to paragraph 4-93.

5-467. BRAKE BURNISHING.

5-468. Perform brake burnishing procedures as follows (see Figure 7-17):

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until all lift trailer wheel and tire assemblies (37, Sheet 1) are off the ground.

3. Rotate wheel and tire assembly (37) and adjust hand-brake lever (2, 70, Figure 7-26, Sheet 2, 4).

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4. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 inches off the floor.

5. Turn off and disconnect power supply.

6. Connect tug to drawbar assembly (32, 33, Figure 7-17, Sheet 1).

7. Tow lift trailer approximately 10 miles per hour for ten laps counter clockwise periodically applying brakes.

8. Disconnect tug from drawbar assembly (32, 33).

9. Connect and turn on power supply.

10. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until all lift trailer wheel and tire assemblies (37) are off the ground.

11. Rotate wheel and tire assembly (37) and adjust hand-brake lever (2, 70, Figure 7-26, Sheet 2, 4).

12. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 inches off the floor.

13. Turn off and disconnect power supply.

14. Connect tug to drawbar assembly (32, 33, Figure 7-17, Sheet 1).

15. Tow lift trailer approximately 10 miles per hour for ten laps clockwise periodically applying brakes.

16. Disconnect tug from drawbar assembly (32, 33).

17. Connect and turn on power supply.

18. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until all lift trailer wheel and tire assemblies (157) are off the ground.

19. Rotate wheel and tire assembly (37) and adjust hand-brake lever (2, 70, Figure 7-26, Sheet 2, 4).

20. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN positions until the rails are fully retracted and foot pads are 8 inches off the floor.

21. Perform brake operational check. Refer to paragraph 5-7.

5-469. HYDRAULIC SYSTEM PRESSURE

TEST.

5-470. Perform hydraulic system pressure test as follows:

1. Install tee fitting and pressure gauge (refer to Table 2-2) in hydraulic line to isolate hydraulic system pump (142, Figure 7-18, Sheet 18).

2. Attach a manually operated hydraulic pump (refer to Table 2-2) and pressurize system from 1764 to 1836 PSI for a minimum of 10 minutes.

3. Check hydraulic system for evidence of leakage.

4. Depressurize hydraulic system and remove manually operated hydraulic pump (refer to Table 2-2).

5. Remove pressure gauge (refer to Table 2-2) and tee fitting.

5-471. LIFT TRAILER TOWING AND

STEERING TEST.

5-472. Perform lift trailer towing and steering test as follows:

w

• The MB-2/U30 tow vehicles are the only au-thorized tow vehicles for towing the lift trailer on flat surfaces and up to 15% slopes. The bobtail vehicle shall only be used for towing on flat surfaces and up to 3% slopes. When these vehicles are not available, refer to (Table 3-1) Towing Force Calculations for Engine Trailer Towing Vehicle to determine an equivalent vehicle. Failure to comply could cause injury to personnel or damage to equipment.

• The MB-4 tow vehicle shall not be used for towing of the lift trailer until completion of TCTO 35D3-3-79-511 is complied with on that specific lift trailer due to the dynamic braking and hard stops of this vehicle. Failure to comply could cause injury to personnel or damage to equipment.

5-230

• Forklift type vehicles with clevis drop pin shall not be used for towing of the lift trailer. Failure to comply could cause injury to personnel or damage to equipment.

1. Connect tow vehicle to lift trailer drawbar.

NOTE

Lift trailer should tow in a straight line without yawing, swaying or skidding.

2. Tow lift trailer at 10 miles per hour for approximately 100 yards.

NOTE

Lift trailer should turn without tire squeal or wheel hop.

3. Tow lift trailer at 10 miles per hour and execute a right turn.

NOTE

Lift trailer should turn without tire squeal or wheel hop.

4. Tow lift trailer at 10 miles per hour and execute a left turn.

NOTE

Lift trailer should back up without wobble, hunting or jerking.

5. Back the lift trailer for approximately 100 feet.

6. Set parking brakes.

7. Disconnect tow vehicle from lift trailer drawbar.

5-473. PERIODIC LOAD TEST.

5-474. Perform lift trailer periodic load test as follows:

NOTE

This task will be performed every 365 days or when any lifting linkages, stabilizing pads or any other major parts are repaired or replaced.

1. Perform the following rail movements functional test:

a. Paragraph 5-345 Functional Test Preparation.

b. Paragraph 5-346 Rail Movements Functional Test.

c. Paragraph 5-347 Axial Movement.

d. Paragraph 5-348 Lateral Movement.

e. Paragraph 5-349 Yaw Movement.

NOTE

Maximum rail height shall be 148 inches.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise lift trailer to maximum extension.

3. Lower lift trailer to rail height of 57 inches.

4. Center the trailer back to the centering index marks.

5. Remove engine/cradle dummy load fixture from lift trailer.

6. Raise all four foot pads so the trailer is in the fully retracted position.

7. Disconnect electrical power from lift trailer. Refer to paragraph 4-93.

8. Disconnect main and remote control pendants and stow in storage box.

5-475. LOWER LIMIT SWITCH

ADJUSTMENT.

5-476. The following procedure describes adjustment and verifies proper lower limit switch operation.

NOTE

There is one forward and one aft lower limit switch. The following procedure describes adjust-ment of one lower limit switch but applies to both.

1. Perform operation. Refer to paragraph 4-98.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks in the UP position until all support pads are touching the floor.

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3. Set the TRAILER FWD END and TRAILER AFT END joysticks in the DOWN position until foot pad movement stops or are eight to 10 inches off the floor.

4. Adjust limit switch by loosening arm clamp screw and rotating the arm until arm contacts roller pad.

5. Tighten arm clamp screw and recheck clearance.

6. Remove 40 bolts (2, Figure 7-20, Sheet 1) and 40 washers (3) securing lid of enclosure (143) to bottom of enclosure (143).

NOTE

Failure of an LED to illuminate could indicate a faulty switch or improper wiring, which should be corrected prior to proceeding.

7. Manually actuate each switch and verify correspond-ing LED illuminates (Located adjacent to J4 plug on A1A1A1 Relay CCA, (Figure 6-8, Sheet 3).

w Extreme care shall be taken when checking limit switch operation. Do not exceed 10 inch limit of the following steps. Failure to comply could cause injury to personnel or damage to equipment.

8. Momentarily activate the SAFETY INTERLOCK OVERDRIVE switch and release. A warning horn will sound while override is activated.

w Do not exceed 10 inches. If trailer fails to stop, further adjustment of the switch may be necessary to activate 8 to 10 inch requirement.

9. Set TRAILER FWD END and TRAILER AFT END joysticks in DOWN position until foot pad movement stops at eight to 10 inches off the floor.

10. Press RESET on control pendent to exit override mode.

11. Coat mating surfaces of enclosure (143, Figure 7-20, Sheet 1) with technical petrolatum (No. 28, Table 2-3) and close enclosure lid of enclosure (143).

12. Install 40 bolts (2) and 40 washers (3) securing enclosure lid of enclosure (143) to bottom enclosure (143).

13. Set TRAILER FWD END and TRAILER AFT END joysticks in UP position until all foot pads are fully seated on the ground.

14. Set TRAILER FWD END and TRAILER AFT END joysticks in DOWN position until lift trailer move-ment stops (Foot pads are eight to 10 inches off the ground).

15. Perform power down procedure (Refer to paragraph 4-93).

• Lift trailer stops.

16. Disconnect electrical power.

5-477. UPPER LIMIT SWITCH

ADJUSTMENT.

5-478. The following procedure describes adjustment and verifies upper limit switch operation.

NOTE

There is one forward and one aft upper limit switch. The following procedure describes adjust-ment of upper limit switches.

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise trailer until movement stops or to maximum extension of 148 inches.

3. Adjust limit switch by loosening roller arm clamp screw and adjust arm to contact actuating angle without rotating switch shaft.

4. Tighten roller arm clamp screw and recheck clearance.

5. Remove 40 bolts (2, Figure 7-20, Sheet 1) and 40 washers (3) securing lid of enclosure (143) to bottom of enclosure (143).

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Failure of an LED to illuminate could indicate a faulty switch or improper wiring which should be corrected prior to proceeding.

6. Manually actuate each switch and verify correspond-ing LED illuminates (Located adjacent to J4 plug on A1A1A1 Relay CCA, (Figure 6-8, Sheet 3).

w Extreme care shall be taken when checking limit switch operation. Do not exceed 151 inch limit of the following steps. Failure to comply could cause injury to personnel or damage to equipment.

7. Momentarily activate the SAFETY INTERLOCK OVERDRIVE switch and release. A warning horn will sound while override is activated.

w Do not exceed 151 inches. If trailer fails to stop, further adjustment of the switch may be necessary to activate 148 to 151 inch requirement.

8. Set the TRAILER FWD END and TRAILER AFT END joysticks to the UP position and raise the trailer until movement stops at a rail height between 148 and 151 inches.

9. Press RESET on control pendent to exit override mode.

10. Coat mating surfaces of enclosure (143, Figure 7-20, Sheet 1) with technical petrolatum (No. 28, Table 2-3) and close enclosure lid of enclosure (143).

11. Install 40 bolts (2) and 40 washers (3) securing lid of enclosure (143) to bottom of enclosure (143).

12. Set TRAILER FWD END and TRAILER AFT END joysticks in DOWN position until foot pad movement stops 8 to 10 inches off the ground.

13. Perform power down procedure (Refer to paragraph 4-93).

• Lift trailer stops.

14. Disconnect electrical power.

5-479. AXIS LIMIT SWITCH

ADJUSTMENT.

5-480. The following procedure describes adjustment to the axis limit switches.

NOTE

There is one forward left, one forward right, one aft left and one aft right axis limit switch. The following procedure describes adjustment of one axis limit switch but applies to all.

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set TRAILER FWD END and TRAILER AFT END joysticks UP until rails are above 57 inches.

3. Set TRAILER FWD END and TRAILER AFT END joysticks to LH or RH until thickest area of forward and aft axis limit switches is 0.500 to 0.750 inches from actuating arm stricker bar.

4. Loosen actuating arm bolt and rotate actuating arm until roller contacts stricker bar.

5. Tighten actuating arm bolt.

6. Position TRAILER FWD END and TRAILER AFT END joysticks to LH or RH until actuating arm rollers clear stricker bars.

7. For aft axis limit switch, position TRAILER FWD END joystick LH or RH to obtain full travel in opposite direction.

8. For forward axis limit switch, position TRAILER FWD END joystick LH or RH to obtain full travel in opposite direction.

9. Set TRAILER FWD END or TRAILER AFT END joysticks to LH or RH until adjusted switch stops positioning frame movement and error code is dis-played.

• E0016, E0017, E0018, or E0019

10. Toggle TRAILER FWD END and TRAILER AFT END joysticks to LH or RH to center positioning frame.

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11. Set TRAILER FWD END and TRAILER AFT END joysticks to DOWN position until the rails are fully retracted and foot pads are eight inches off the floor.

5-481. AFT LIMIT SWITCH

ADJUSTMENT.

5-482. The following procedure describes adjustment of the aft limit switch.

1. Operate lift trailer. Refer to paragraph 4-98.

2. Set TRAILER FWD END and TRAILER AFT END joysticks to UP until rails are above 57 inches.

3. Set TRAILER AXIAL/ROLL joystick to FWD until upper assemblies actuator (44, Figure 7-1, Sheet 1) is fully retracted.

4. Set TRAILER AXIAL/ROLL joystick to AFT until upper assemblies actuator (44) is extended 11.25 to

11.50 inches.

5. Loosen actuating arm bolt and adjust actuating arm until roller contacts stricker bar.

6. Tighten bolt.

7. Position TRAILER AXIAL/ROLL joystick to FWD until actuating arm clears stricker bar.

8. Position TRAILER AXIAL/ROLL joystick to AFT until movement stops and error code E0020 appears.

• Upper assemblies actuator extension is 11.875 to 12.125 inches.

9. Position TRAILER AXIAL/ROLL joystick to FWD to center positioning frame.

10. Set TRAILER FWD END and TRAILER AFT END joysticks to DOWN position until the rails are fully retracted and foot pads are eight inches off the floor.

5-483. CENTERING POSITION SENSOR

AND CUP HOLDING MAGNET

ASSEMBLY ADJUSTMENT.

5-484. The following procedure describes adjustment of the centering position sensor and magnet (see Figure 7-19).

NOTE

There is one forward and one aft centering position sensor and cup holding magnet assembly. The following procedure describes adjustment of one sensor and magnet but applies to both.

1. Loosen two bolts (292, Figure 7-19, Sheet 13) secur-ing bracket (291) and magnet (287).

2. Slide bracket (291) down to its lowest position and tighten bolts (292).

3. Center trailer to centering marks. Refer to paragraph 4-91.

4. Loosen two bolts (292) securing sensor enclosure bracket (291) and position sensor (279) over magnet (287). Tighten bolts (292).

5. Adjust bracket (291) and magnet (287) to maximum

0.125 inch. Torque bolts (292) to 64-76 ft-lb.

6. Loosen nut (290) securing magnet (287) to bracket

(291) and adjust lateral position until magnet (287) is centered under sensor. (279) Tighten nut (290).

NOTE

When the lift trailer is lowered from 56 inches to 54 inches the upper and lower centering position sensors must be aligned by the operator before the trailer can be lowered.

7. Center trailer to centering marks. Refer to paragraph 4-91.

5-485. LOAD LADDER LOGIC TO

CENTRAL PROCESSING UNIT

CONTROLLER (CPU).

5-486. The following procedure describes uploading the ladder logic program from EEPROM card to the internal memory of the CPU.

1. Remove 40 bolts (2, Figure 7-20, Sheet 1) and 40 washers (3) securing lid of enclosure (143) to bottom of enclosure (143).

2. Ensure serviceable EEPROM card (60, Sheet 5) is properly inserted into the auxiliary memory (aux mem) socket located on the front panel of the CPU (59). Refer to paragraph 5-302.

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3. The EEPROM card (60) remains in the aux mem socket after uploading the program.

NOTE

Step 3 allows the logic program stored on the EEPROM card to replace the corrupted program stored in the internal memory of the CPU when power is off.

4. Move the memory protection (MEM PROT) slide switch down to the OFF position.

5. Momentarily remove 3.6V lithium battery (No. 24, Table 2-3) from CPU (59, Figure 7-20, Sheet 1).

6. Replace or reinstall 3.6V lithium battery (No. 24, Table 2-3).

w Before applying electrical power, depress the con-trol pendant emergency stop button (12.