Attachment_0001-_D-30_Acceptance_Test_Plan.pdf

PDF 3 MB Posted May 10, 2016

Attached to: D-30 Repair Parts
Solicitation number: W15QKN-16-R-0103
Issued by: Department of the Army Materiel Command Contracting Command Picatinny Arsenal

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Attachment 0001- D-30 Acceptance Test Plan

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W15QKN16R0103-0002.pdf	PDF	Jun 2, 2016
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Exhibit_A-_DD1423_CDRLS_A001-A008.pdf	PDF	May 11, 2016
Attachment_0005-_Clearance_of_Technical_Information_for_Public_Release.pdf	PDF	May 10, 2016
Attachment_0002-_D-30_Inspection_Criteria.docx	DOCX document	May 10, 2016
Attachment_0004-_Standard_Form_LL_Disclosure_of_Lobbying_Activities.pdf	PDF	May 10, 2016
Attachment_0003-_Past_Performance_Questionnaire.docx	DOCX document	May 10, 2016
D-30_Acceptance_Test_Plan.pdf	PDF	May 9, 2016
D-30_Inspection_Criteria.docx	DOCX document	May 9, 2016
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This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part

POST OVERHAUL ACCEPTANCE TEST PLAN FOR D-30 HOWITZER dated September 18, 2010

Table of Contents

TEST EQUIPMENT FOR THE INSPECTION OF D-30(A) HOWITZER (PHOTO 1)

Travel Mode Checks

TRAVEL Mode to COMBAT Mode Checks

Combat Mode Checks

Hydro-firing test

ORDER of works for testing of D-30(A) howitzer by hydro-round firing

Safety precautions

ORDER FOR CORRECTION DETERMINING ON TARGET DISTRACTION LINE OF D-30 SIGHT

FIGURES

Fig. 1 Trails

Fig. 2. Cannon:

Fig. 3. king bolt ring

Fig. 4. Ballistic shield

Fig. 5.1. Shielding with locking mechanism

Fig. 5.2. Shielding with locking mechanism

Fig. 6. Wheel raising mechanism:

Fig. 7. Bottom carriage:

Fig. 8. Cradle:

Fig. 9. Recuperator mechanism

Fig. 9.1. Recoil absorber

Fig. 9.2. Recoil Absorber 2А18.Сб108

Fig. 10.1. Breechblock assembly

Fig. 10.2. Diagram of breechblock and sear lock parts coupling

GD-OTS letter No. RA-11-005 Submitted: January 11, 2011 Contract No. W91CRB-09-C-0125 abraham Line abraham Typewritten Text January 10, 2011

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part

Fig. 11. Traversing mechanism

Fig. 12. Undercarriage

Fig. 13. Mechanical Sight Д726-45

Fig. 14. Equilibrator mechanism

Fig.15. Shield with crosslines for testing boresight datum line

Fig. 16. ОП4М-45 optical sight deflection mechanism:

Fig. 17. Optical sight ОП4М-45:

Fig. 18. Crosshairs mechanism

Fig. 19. ОП4М-45 crosshairs:

PHOTOS

REFERENCES TO UDC TECHNICAL LITERATURE

GD-OTS letter No. RA-11-005 Submitted: January 11, 2011 Contract No. W91CRB-09-C-0125

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part

TEST EQUIPMENT FOR THE INSPECTION OF D-30(A) HOWITZER (PHOTO 1).

Caliber (rod) for checking barrel straightness M-480012 (1)

T-connector (Sb.42-25) with manometer

(pressure gauge MCA-100) to test the pressure in recoil brake, counter-recoil mechanism and balancing gear (2)

Instrument (PZK) for chamber measurement

(3)

Beam compass (caliper) GOST 166-73 (4)

Gauge board for measuring of the protrusion

/movement of firing pin (5)

Caliber (disk) for measuring hammer force of firing pin (6)

Set of gauge probes for gap measurement

GOST 882-75 (7)

Star gauge (8)

Borescope (9)

Dynamometer – used for measuring force

(not shown on the photo).

Power adapter for checking of signal lights

(electrical equipment) (not shown).

Artillery quadrant (10)

Standard tools

Reference level (not shown)

Aiming circle (11) or transit compass

(theodolite).

Testing target for setting zero line (not shown)

Ruler 12

Chalk (not shown)

Gauge for stargauge (13)

Gauge for muzzle break alighnment (14)

GD-OTS letter No. RA-11-005 Submitted: January 11, 2011

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part

. 11

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part

D-30 howitzer No.

Mechanical sight D-726-45-

U64 No.

PG-1M-U64 No.

OP4M-45 No.

The tube and chassis serial number of the howitzer

№ Check Technical requirement/results References to 122 mm howitzer D-30 (2A18) Guide to the average repair Remarks

TRAVEL MODE CHECKS

(1) Borescope examination

No splits or cracks are allowed Copper plating should be removed

-check the interior surface by borescope for splits, cracks and copper plating.The interiror surface is examined by borescope (Photo 2)

Chamber depth examination

- Check the length of the charge case with PZK instrument for chamber measurement.

Within 591-594mm (+20 mm)

Remove the breechblock. Insert the PZK instrument (tool #3 on the photo) from the breech end till stop is reached. Read the indication on the ruler tool#12 (Photo 3).

(52) Stargauge test

Land 121.92 mm

Groove 123.95 mm

Max localized bulge is allowed D=126.5 mm

Ch.2 paragraph 2 p.14 To determine the barrel bore condition the barrel is examined with the stargauge (Photo 1). Set stargauge to 121.92 using gauge. Insert stargauge into breech end of tube insuring the gauge tracks into the rifling. Take measurements every 100 mm of tube depth (Photo 4).

4. (51) Cannon bending

-check the barrel curvature by gauge L=610мм D=121,85+0.003

Caliber rod (tool #1) (Photo 1) should be inserted in the barrel from the breech end. The barrel condition is acceptable if the caliber passes freely trrough the entire tube (Photo 5 )

(83) Strike pin protrusion beyond the wedge surface 2,0 – 2,38 mm

Ch.3. paragraph 15 a, p.31 Extract the breechblock wedge out of the breech seating, release the striker pin, measure the strike pin protrusion beyond the wedge surface using the gauge No 5 (Photo 1). There are two cuts on the gauge with height 2 and 2,38 mm correspondingly. Check the passing of the striker for both cuts.

Normal striker protrusion: 2,0—2,38 mm. (Photo 6 )

(7) Locking moving trails in travel position The mounting should be secure

Ch.9. paragraph 2, p77.

Close moving trails to the fixed one 35 (fig.1) and try to lock them.

(Photo 7)

(16) Muzzle recoil compensator looseness Looseness is not allowed

Ch.2. paragraph 4,p14 Lock tipping part (cannon tube) in travel position. Using manual force, ensure muzzle brake is not loose.

(8) Locking the tipping part

(cannon tube) in travel position

The mounting should be secure Ch.9. paragraph3, p 77 Lay tipping part (cannon tube) onto frame 4 (fig. 1) and attempt to fix it with use of the trunnion cap 7 and screw 20 with nut 10. Attempt to secure nut 10 from self-unscrewing with lock pin 15. (Photo 8).

(9) Vertical looseness of the tipping part (cannon tube) locked in travel position Not more than 0-03

Ch.9. paragraph 4, p 77 Lock the tipping part (cannon tube) into travel position. Turn the elevating mechanism handwheel any direction all the way, and take a elevation measurement.

Turn the elevating mechanism handwheel all the way in the other direction, and take another elevation measurement. The difference between two measurements cannot exceed 0-03 mil.

10. (10) Check travel lock for gaskets looseness Looseness is not allowed

Ch.9. paragraph 5, 79 Check gaskets 8 (fig. 1) for looseness. No looseness is allowed.

11. (11) Check (travel lock) yoke locking in travel position The yoke should be held in position by the detent.

Ch.9. paragraph 7, p84 In the travel position yoke 23 (fig.1) must be securely retained by lock 5.

12. (12) Check spades locking in Shovels should be securely Ch.9. paragraph 9, p84 In travel position spades 2 must be securely locked by mounts 27

13. (15) Maximum elevation angle in travel position Max 30º

Ch.7. paragraph 5, p71 Place howitzer in travel position. Elevate howitzer tipping part to max elevation angle. Take an elevation measurement. Elevation must not exceed 30°.

14.

15. (18) Draw-bar looseness

(lunette, towing eye) 20-25 mm

Applies to non-D-30 2A18M models only Ch.2. paragraph 6, p15 Test draw-bar for looseness; permitted looseness must not exceed 20

- 25 mm.

The testing shall be made in two positions of the draw-bar attachment: the travel (stowed) position and the firing position

(Fig.2).

16.

(20) King bolt ring wall thickness (lunette, towing eye) Min 42,4 mm

Ch.2. paragraph 8, p21 Measure thickness of the king bolt ring wall which contacts with the tractor pintle hook by caliper (tool #4, photo 1).

The wall thickness must equal or exceed 42,4mm (Fig.3).

17. (38) Check for recoil shield bending

Shield bending that obstructs the howitzer mechanisms operation is not allowed.

Verify that the shield does not obstruct operation of the howitzer..

(UDC -03-140510, Ch4 Paragraph G

18. (40)Recoil shield looseness Looseness is not allowed By manual effort check the shield for looseness.

No looseness is allowed. Photo 10

19.

(39) Check whether left and right halves of the ballistic shield are fastened securely Looseness is not allowed

Ch.12. paragraph 1 p92 Check looseness of the left and the right halves of the shield in mating areas of the end caps and the latch.

No looseness is allowed.

20. (41) Ballistic shield doors looseness Looseness is not allowed

Ch.12. paragraph 2 p92 The doors must not be loose when handles 6 (fig. 4) are closed.

Check for looseness of handle 6 on the button axle 5 and on axle in holes of doors 7 and 8. No looseness is allowed

21. (42) Ballistic shield doors Looseness is not allowed Ch.12. paragraph 3, p92 Doors 7 (fig. 4) and 8 must be firmly fastened with lock pins 16.

22. (43) Looseness of the bottom ballistic shield Looseness is not allowed

Ch.12. paragraph 4, p92 Looseness of the bottom shield 13 (fig. 4) is not allowed.

23.

(28) Check for free movement of the recoil indicator pointer slider

The pointer slider must be movable by hand with a visible effort.

Ch.5. paragraph 4, p49 To obtain correct indication of the recoil length, test movement of the recoil indicator pointer (fig. 5) with plate along the recoil indicator shaft. The pointer slider must be movable by hand with a visible effort. (Photo11)

TRAVEL MODE TO COMBAT MODE CHECKS

24. (13) Moving trails sagging Max 16 mm

Ch.9. paragraph 10, p 84 Bring together the moving trails without locking them in travel position, using the ruler tool # photo 1, measure the distance of the moving trails to the fixed trails using the flat table tops od each as the reference. Repeat this measurement pulling up on each of the mivuing trails. Difference between measurements shall not exceed 16 mm.

25.

(35) Check whether jack handle tube is fastened securely Looseness is not allowed

Ch.10. paragraph 3 p85 Ensure that jack tube handle (Photo 12) is secured by detent when not in use

26. (36) Jack pan condition

Some deformation to the ribs is acceptable provided operation of the hydraulic pump is not impeded.

Move down the hydraulic jack. Visually examine the condition of pan.(Photo 13)

27.

(44) Jack function

Check there are no visible leaks on the tube joints of the hydraulic jack

No leak is allowed

UDC-10 Ch5. Paragraph 1 p13

Check for fluid leaks in the hydraulic system connections. Fluid leakage is not allowed.

In case leakage is found, investigate the cause and

28.

This mechanism should safely lift the howitzer, with a force of not more than 35 Kgs on the handle of hydraulic pump, once the howitzer is fully raised, which should extend for a distance of

950mm (with dynamometer).

The force on the handle should not exceed 35 Kgs

The howitzer must beelevated by the hydraulic jackuntil the wheels are raised offthe ground.When the howitzer is fullyraised by the hydraulic jack(the out stroke of cylinder androd of the hydraulic elevatorram at 540±4 mm), and thehandle work continues, therelief valve must go off.The effort on the hydraulicpump handle at time of therelief valve action must notexceed 35 Kgs. Photo 15 and Photo 16

29. (46) Play of the jack right handle under load Not more than 1/2 -3/4 turn

Applies to non-D-30 (2A18M) model Ch.10. paragraph 4, a, p88 Increased play of the jack right handle is not allowed. The right handle play is allowed within 1/2 – 3/4 turns.

30.

(45) Check whether howitzer lowers arbitrarily while in jacked up position

Arbitrary howitzer lowering is not allowed

Ch.10. paragraph 2, p85 Jack up the howitzer. Wait 5 min. Ensure howitzer has not been lowered Photo 17

31.

Check the operability of hoisting lines.

Also check for any damage to wire strands.

hoisting lines should be properly secured Move down the hydraulic jack. Visually examine the condition of hoisting lines of hydraulic jack. Wire strands should be not damaged.

32.

(33) Check whether coupling is engaged with the halfcoupling and the toothed hub of the travel axle shaft

The coupling should be secured

Ch.8. paragraph 3, 72 After jackin up the howitzer, up raise the wheels and ensure that coupling 6 (fig.6) is engaged with halfcoupling 18 and the toothed hub of the travel axle shaft 6 (Photo

18)

33. (47) Wheel raising mechanism function

The mechanism should support the transition of the howitzer from travelling mode to arming and vice versa

During transferring of the howitzer from arming mode to travel and vice versa check the function of wheel raising mechanism.

(Photo 19)

34. (34) Check whether the wheel lift coupling is locked The coupling should be secured by detent

Ch.8. paragraph 4, p72 Ensure wheels can be fully raised.

Fasten coupling 6 (fig. 6) with lock 4 while transferring howitzer from travel to firing position, and back. Additionally ensure that handle is retained by clips.

35. (48) Check moving trails lock in firing position

In firing position the detent should cover both holes on the eyelet of the bottom carriage

Ch.9. paragraph 1, p77 Jack up howitzer. Open movable trails and try to close them again.

The trails must be retained by lock 3 (fig. 7) and not close.

36. (49) Frame (yoke) locking in firing position Lock must fully engage

Ch.9. paragraph 6, p83.

In the firing position frame 4 (fig.1) must be retained by lock 29.

37. (50) Spades locking in firing position Lock must fully engage

Ch.9. paragraph 8, p84 Photo 20 Before releasing jack pressure, insert spades into the ends of the movable trails. Ensure spades are licked securely (fig.1)

38.

Check the amount of the oil in the tank. The level should be tested immediately after movement of the jack, and the jack being fully raised.

The level of the oil should t be between the marks of the oil level gauge.

Fully stow jack then check fluid volume in the reservoir by removing dipstick (Photo 21). The level of fluid in the reservoir must be between the marks

COMBAT MODE CHECKS

39. (14) Breakage of quadrant and pinion shaft teeth) Breakage is not allowed

Ch.6. paragraph 6, p66 Elevating the howitzer if necessary, examine all the gear teeth

40. (17) Tube recoil compensator cranking

The matchmark on the fully screwed down recoil compensator must be positioned between the matchmarks on the tube.

Applies to non-D-30 (2A18M) model only Ch.2. paragraph 5, p14

Unscrew retainers from the recoil compensator and screw down the recoil compensator against the stop at the muzzle end face of the tube.The matchmark on the fully screwed down recoil compensator must be positioned between the matchmarks

41.

(19) Check draw-bar fastening in travel and in firing position

The fastening should be secure

Applies to non-D-30 (2A18M) model only Ch.2. paragraph 7 p.19

The testing shall be made in two positions of the draw-bar attachment: the travel (stowed) position and the firing position.

42. (21) Is the cradle jacket fastened securely?

The mounting should be securely fastened by retaining bolts.

Ch.5. paragraph12, p54 Ensure jacket 3 (fig. 7) is fastened securely by bolts.

Photo 22.

43. (22) Cover assembly free movement Smooth movement by hand

Ch.5. paragraph 13, p54 fig.8 Unscrew the fixing of the cover assembled, manually move the cover. Hand effort should sufficient to move the cover. (Photo 23)

44. Movement of cradle covers No binding of covers is allowed Manually check clean movement of cradle covers in direction of travel, and that there is no lateral play in the mechanism.

45.

(54) Clearance between the nut on the recoil compensator rod and the cradle plane surface.

Max 0,2 mm

Ch.15. paragraph 5, b, p110 The cradle cover is unscrewed and opened. The clearance is measured by 0.2 mm gauge probe (tool #2) for gap measurement

(photo 1).An excessive clearance more than 0.2 mm between nut 30

(Fig.9.1) 2 Fig.9.2. and cradle side surface is unacceptable.

46.

(55) Clearance between the nut on the recuperator rod and the cradle plane surface.

Local clearance max 0,05 mm is allowed

Ch.15. paragraph 6, b, p110 Using the feeler gauge #7 (Photo 1) measure the distance between the recuperator nut 2 (Fig.9.1) and the cradle surface. Permissible value of the local clearance shall not exceed 0,05 mm. (Photo 24)

47.

Check the fuid leakage inside cradle and nut of the recuperator The nut should be sufficiently tight to cradle

48. Movement of cradle covers No binding of covers is allowed Manually check clean movement of cradle covers in direction of travel, and that there is no lateral play in the mechanism.

49. (66) Check breech-block can Breech-block must be Ch.3. paragraph 1 and 2, p 23 Push onto rod 1 (fig. 10.1) and swing the breechblock opening handle

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part requirement/results References to 122 mm howitzer D-30 (2A18) Guide to the average repair Remarks be opened by hand opened by hand to the utmost rear right position, at this time, the lower end of lever 7 must drop into slot of the crank axle (54). By swinging the handle forward, try to open the breechblock.

50.

(67) Clearance between the breech end face of the tube and the block surface Max 6,5 mm

Ch.3. paragraph 1 a, p23 Using an empty canister with 5 mm lip place the canister into the chamber and close the breech. Using the feeler gauge tool#7 (Photo

1) , ensure that any remaining cumulative clearance between the canister and the breechblock and the tube does not exceed 1.5 mm.

51.

(68) Check if breech opening handle is retained by the sear claw

Opening handle shall be retained by the sear

Ch.3. paragraph 3, p 26 Without pushing on rod 1, try to move the handle; the handle must not move, it shall be retained by the sear 4 claw engaged with the handle stop 5 (fig.10.1)

52.

(69) Check if breechblock wedge is held in the lower position

The extractors must hold the breechblock wedge in the lower position.

Ch.3. paragraph 4, p26 Open the breech manually and check whether the extractors hold the breechblock wedge in the lower position.

53.

(70) Check if extractors release the breechblock wedge

Extractors must release the breechblock wedge.

Ch.3. paragraph 5, p26 Open the breech manually and check whether the extractors release the wedge. When breechblock release handle is pulled (photo 23)

54. (74) Check if hammer arms upon breech opening

The striker pin must not project beyond the block surface.

Ch.3. paragraph 8, p 27 Open and close the breech. With use of a metal ruler (tool #12), check whether the striker pin of the hammer projects beyond the block surface.

55. (75) Check if hammer arms by the re-arming mechanism.

The striker pin must not project beyond the block surface.

Ch.3. paragraph 9,p 28 While breech is closed and hammer is set off, turn re-arming handle

13(fig.5.1) all way up to against stop 11.

With use of a metal ruler, check whether the striker pin of the hammer projects beyond the block surface.

56.

(77) Check if re-arming handle returns to its initial position

Re-arming handle must return to its initial position

Ch.3. paragraph 10 a, p 28 Pull rearm handle 13 down against stop 11, and release it.

Actuated by the spring, the handle must jump to its initial position

(Photo 25)

57. (78) Check for self-induced hammer release Self –induced hammer release is not allowed.

Ch. 3, paragraph 11, p 29 Manually lower the breechblock and then close. Pull manual release handle. An audible pop should be heard when handle is pulled.

Self –induced hammer release during breech closing is not allowed.

58.

(79) Hammer release when breech is not completely closed

Hammer must not release when breech is not completely closed

Ch.3. paragraph 12, p29 Pull the rearm handle. Lower the breechblock apporox 5 cm.pull manual release handle. Hammer must not release i.e. no pop should be heared.

59. (80)Check to insure that the hammer releases An audible clack should be heard.

Ch.3. paragraph 13, p 30 Open and close breech.

Check if the hammer cocked. Release hammer by pushing handle 13

(fig. 10.1) of the manual release; at this, an audible clack should be heard.

60. (84) Striker pin slapping off-centered

Not more than 6,5 mm

If striker pin is off-centered, check twice. The distance between two strokes is measured

Ch.3. paragraph 15d, p31 Check proper position of striker pin imprint on the percussion primer.

Perform the procedure twice spinning the primer 90°. Distance between two imprint boundaries shall not exceed 6,5 mm (Photo 26)

61. (85) Does breechblock stop return to its initial position?

Actuated by the spring, the breechblock stop must jump to its initial position.

Ch.3. paragraph 16, p32 Open the breech, push the breechblock wedge stop 19 Fig 10.1, and then release it. Stop must return to its initial position

62.

(86) Does retainer return to its initial position ?

Actuated by the spring, the cap must return to its initial position

Ch.3. paragraph 17, p32 Push retainer 18 Fig 10.1 all the way down against stop, and release.

Actuated by the spring, the retainer must jump back to its initial position.

63.

(87) Does manual release handle returns to its initial position?

The handle should return to its initial position Ch.4. paragraph 4, p 38 Pull and release the handle 20 Fig.10.1.

The handle should return to its initial position.

64.

(88) Manual release handle effort Max 20 kgf Ch.4. paragraph 4 c , Check the effort for handle release by dynamometer. Manual release handle 13 (Fig 10.1.) effort should not exceed 20 kgf.

65.

(89)Does the handle return to its initial position?

The handle should return to its initial position Ch.5. paragraph 14, p.54 Swing the handle Fig.10.2.aside, and release, the handle should return to its initial position, i.e. to reach stop 8

66.

(90) Locking mechanism action when cannon elevation angle exceeds +22°

The locking mechanism must block the hammer release when the breech ring is on one of the trails, and should not block when the breechblock is between the trails.

Ch.4. paragraph 1 and 2, p.34 Set the howitzer into firing position. Elevate cannon to + 22° and direct it so that the breech ring is above one of the trails; at this time, the locking mechanism roller 7 (fig. 5.1) must be positioned on the shoulder flange 8 (fig.5.1.). When manual trigger handle 13 is pulled, the hammer must not be triggered, i.e. no pop should be heard.

Check this when the breech ring is above all three trails and verufy that is does trigger when not above trails Photo 27

67.

(91) Clearance between the bearing surface of guide plate with the slide and lock lever arm when the breech ring is on one of the trails and elevation angle exceeds +22°

0,2 – 2,5 mm Ch.4. paragraph 1, b, p34 Using the feeler gauge #7 (Photo 1), measure gap between the bearing surface of the guide plate and the lock lever arm.

The clearance must fall within 0,2-2,5 mm range.

(Photo 28)

68.

(31) The traversing mechanism drive fastening secure?

The drive should be secured in supporting bracket

Ch.7. paragraph 4, p71 Move traversing handwheel (fig. 11). Ensure howitzer moves left and right and ensure that the support bracket does not move.

69. (32) Check whether the howitzer is spring-cushioned

Clearance between cranks and bumpers, which must fit within limits of 0,5-6 mm

Ch.8. paragraph 1, p72 Place howitzer in travel position. Check whether the mounting pads of the right 1 (fig. 12) and the left crank (road arm) touch the top and the bottom bumpers, items 3 and 5 respectively; measure clearance between cranks and bumpers, which must fit within limits of 0,5-6 mm.

70.

(92) Effort on the elevation handwheel at set motion Max 7,5 kgf Ch.6. paragraph 3,p61

Check the elevating mechanism performance by elevating the tipping part of howitzer from —7° to +70°, and then from +70° to —7°. The mechanism must work smoothly.

The effort on the handwheel at set motion must not exceed 7,5 kgf measured by dynamometer.

71.

(93) Full vertical looseness of the howitzer tipping part

(cannon tube)

Max 0 -07 mils Ch 6, paragraph 4 p63 The looseness check shall be performed in the firing position of the howitzer at the tipping part elevation from 0 to 2°.

Check the initial position of level bubbles. Apply the manual pressure on muzzle brake upward and downward. Check the position of level bubbles. Variance should not exceed 0-07mils.

72.

(94) Backlash of the elevating mechanism Shall not exceed 1/4 of the handwheel turn Ch.6. paragraph 5, p64 Check play of the elevating mechanism. Perform checking at the following elevation angles of the howitzer tipping part: 0°, 30° and

70°. The mechanism play should not exceed 1/4 turn of the handwheel.

73.

(95) Effort on the traversing handwheel at set motion The effort on the handwheel shall not exceed

6.5 kgf

Ch.7. paragraph 1, p 67 Check the traversing mechanism operation by turning the rotating part to different traversing angles.

The mechanism must work smoothly. Check the effort on the handwheel by dynamometer.

The effort on the handwheel at set motion must not exceed 6.5 kgf.

74.

(96) Full horizontal looseness of the howitzer traversing part Max 0 -08 mil Ch.7. paragraph 2, p 70

Push the muzzle end of the howitzer all the way the right. Line up the vertical cross-hair of the pantel with a known vertical reference note the measurement on the pantel. Push the howitzer all the way left and again align the pantel with the known vertical reference. The difference in the pantel measurements shall not exceed 0-08mil.

75.

(97) Backlash of the traversing mechanism The mechanism backlash should not exceed 1/3 turn of the handwheel.

Ch.7. paragraph 3, p.71 Check play of the traversing mechanism.

Elevate howitzer to 0°. Move the traverse handle and measure the backlash by threads and compare to the length of the handwheel.The mechanism backlash should not exceed 1/3 turn of the handwheel.

76.

(99) Wheels and brakes functionality test Wheels should move smoothly without jumps and jamming and break should securely hold the wheel

Ch.11. paragraph 1, p 90 Place howitzer from travel to firing position. Test wheel rotation by hand. Wheels rotation must be smooth and not stiff.

UDC=08-0710 Ch14 paragraph6.1 p111 Connect a pneumatic air source (tractor) and ensure brakes engage.

The brake should securely hold the wheel.Listen for leaking air.

Leakage is not allowed.

Check that hoses in the pneumatic system of the wheel brake are air-tight. No mechanical damages or torn hoses are allowed.

Check the performance of wheel brake assembly. UDC-08-0710 Ch

5 paragraph2 pp30-34

Check tire pressures are 4,3± 0,2 kgs/sm2.

Check tire condition UDC-08-0710 Ch.13 paragraph10.3.p101

Always maintain the necessary pressure in the tires, avoid contact of fuel and lubricant with the tires, and don't allow the howitzer to be parked on wheels for over ten days. In case of long parking, the howitzer should be positioned on chokes.

To prevent valve insides from contamination and damage and to avoid escape of air from the chamber, the valve should have a cap.

Examine the tires before and after movement.

77.

Check that lights function properly

All lights must function properly UDC -8-0710 Ch.14.paragraph6.4.p111

Examine the state of the cables, lamps and cable box. Connect the plug to the power (tractor) adapter socket; the perimeter lights should be lit when the light switch is flipped in the tractor; the stop lights should be lit when the tractor brake pedal is pressed. When the turning switch is flipped, the appropriate turning light should be lit.

78.

(100) Axial looseness of wheels Not allowed Ch.11. paragraph 2, p90

Transfer howitzer from travel to firing position. Check for axial looseness on wheels (manually by hand effort move the wheel in axial direction).

79.

(101) Д726-45 Sighting

Equipment secure fastening and correct installation

Sighting Equipment must be secure Ch.7 paragraph 1 p46 (UDC-08-060710)Ch.10 paragraph 4 p72 Check the fixing of Д-726-45 and ОП4М-45 sights to the howitzer and examine the sights. The sights should be operational; the sight mechanisms should work smoothly, with no excessive effort required on the handwheels.

Fig. 13 Photo 29

80.

(102) Vertical looseness of pantel in the telescope mount.

Vertical looseness is not allowed Ch.14. paragraph 1, p98 Pull up on the pantel.Vertical looseness of pantel with respect to the mount is not permitted.

81.

(103) Horizontal/ torsional looseness of pantel in the telescope mount.

Horizontal/torsional looseness is not allowed Ch.14. paragraph 2, p98 Pull, push and twist pantel.

Horizontal/torsional looseness of pantel inrespect to the moint is not permitted.

82.

(104) Does the distance drum indicator pointer hold in set position on the guide plate?

Indicator pointer must hold in set position on the guide plate

Ch.14. paragraph 3, p 98 Indicator pointer 1 (Fig. 13) must be held in set position on the guide plate 2 by spring 3

83.

(105) Easy movement of the position angle mechanism?

Ch.14. paragraph 4 , p98

Move position angle mechanism trhough full range of motion.

Motion should be smooth without binding.

84.

(106) Easy movement of the cross-level (cant) mechanism?

Ch.14. paragraph 5, p98 Move cross –level mechanism trhough full range of motion. Motion should be smooth without binding.

85. Easy movement of the elevation mechanism Move elevation mechanism through the full range. Also mechanism should be retained by detent

86.

(107) Sighting level vials sensitivity UDC-08-0710, Ch.10 paragraph 4 p72

Move both position angle mechanism and the cross-level mechanism.

Ensure that the level vials move accordingly

87.

(108) Unrecoverable axial looseness of sight (surging) Max 0-01mil Ch.14. paragraph 6, p98

UDC-08-0710, Ch.14.paragraph.8 p115 To determine the nonrecoverable surging of Д-726-45 sight, do the following:

- use the sight mechanisms or the howitzer elevating mechanism move the longitudinal level air bubble to the middle; push the telescope holder forwards using an effort of 7-8 kgf, then release it and note the position of the longitudinal level air bubble relative to the tube graduation marks;

- push the telescope holder backwards using an effort of 7-8 kgf and release it, noting down the longitudinal level air bubble position relative to the tube graduation marks.

The value of the nonrecoverable surging of Д-726-45 sight should not exceed 0-01; the surging value is measured by the longitudinal

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part requirement/results References to 122 mm howitzer D-30 (2A18) Guide to the average repair Remarks level tube graduation marks; one mark equals one mil.The unrecoverable axial looseness of sight should not exceed 0-01 mil.

88.

(109)Unrecoverable transversal looseness of sight

(heaving)

Max 0-02 mil Ch.14. paragraph 7, p101 UDC-08-0710, Ch.14.paragraph.8 p115 To determine the nonrecoverable heaving of Д-726-45 sight, do the following:

- use the sight mechanisms or the howitzer elevating mechanism move the lateral level air bubble to the middle; push the telescope holder leftwards using an effort of 7-8 kgf, then release it and note the position of the lateral level air bubble;

- push the telescope holder rightwards using an effort of 7-8 kgf and release it, noting down the lateral level air bubble position.

The value of the nonrecoverable heaving of Д-726-45 sight should not exceed 0-02; the surging value is measured by the lateral level tube graduation marks; one mark equals one mil.

The unrecoverable transversal looseness of sight should not exceed 0-

02 mil

89.

(110) Unrecoverable looseness of the position angle mechanism

Max 0-01 mil Ch.14. paragraph 8, p 103 UDC-08-0710, Ch.14.paragraph 8.2 p113-114 -set position angle mechanism in zero -Level the weapon so buble is centered -manually twist the longitudional level bubble and allow it to return to its initial position -the bubble should return to within graduation of center

90.

(111) Axial level vial instability The bubble shall not reach the edge marks on the vial Ch.14. paragraph 9, p 103 UDC-08-0710, Ch.14 paragraph 8.4 p 116 The stability of Д-726-45 sight longitudinal level is checked as follows:

-level the Д-726-45 with resepect to cant and elevation

- turn the fixing screw of the cant mechanism to tip the sight all the way to the right, and then all the way to the left; the longitudinal level bubble should not reach either edge of the vial;

91. (112) Transversal level instability during cannon tube

The bubble shall not reach the edge marks on the vial Ch.14. paragraph 10 UDC-08-0710, Ch.14 paragraph 8.4 p 116

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part requirement/results References to 122 mm howitzer D-30 (2A18) Guide to the average repair Remarks elevation The stability of Д-726-45 sight lateral level is checked as follows:

-level the Д-726-45 with resepect to cant and elevation

- turn the elevation angle mechanism handwheel to change the sighting angle from 0-00 to 11-70; the lateral level bubble should not reach the edge marks on the vial

92.

(113) Backlash of the angle-of-elevation mechanism not more than 0-01 mil Ch.14. paragraph 11, p104

UDC-08-0710 Ch14 paragraph8 p114 To determine the backlash of the sighting angle mechanism of Д-

726-45 sight, do the following:

-in a clockwise motion, set the elevation angle mechanism to zero -level the weapon usin the gun’s elevation mechanism -in a clockwise motion turn the elevation anlge mechanism 40-50 mils, then back to 0 counterclockwise motion

- the bubble should return to center within graduation.

93.

(115) Backlash of the position angle mechanism not more than 0-01 mil Ch.14. paragraph 13, p105 Same as angle of elevation mechanism

113 (119)

-turn knob 20 (Fig.14) counterclockwise to 20 mils

- elevate cannon to center the level bubble

Then knob 20 past 20 a minimum of 20 mils counterclockvise

-then clockwise back to 20 without passing 20

-the level bubble should return to center within 1 graduation of center

-return the position angle mechanism to zero

94.

(120) Line of sight climb during cannon not more than 0-03 mil

See ORDER FOR CORRECTION DETERMING ON TARGET

DISTRACTION LINE OF D-30 SIGHT

95.

Overall condition of the howitzer, condition of the paint

Visually check the overhauled howitzer for accurate painting. Ensure that all nuts and washers are present as well as all wire lacing is present.

96. Overall condition of the howitzer, condition of the Visually check the overhauled howitzer for accurate painting. Ensure that all nuts and washers are present as well as all wire lacing is

97.

(72) Check if breechblock closes during loading After the shell moves the knockout pin, the breechblock wedge should vigorously return to its maximum upward position.

Ch.3. paragraph 6, p27 Send regular cartridge to the cannon charge case; during this operation, the breechblock wedge must close completely (fig. 10.2).

For additional information See ORDER of works for testing of D-

30(A) howitzer by hydro-round firing Photo 30

98.

(73) Check if breech opens automatically

NOT ALLOWED:

-self induced breechblock closing;

-self-induced shot;

-sticking and breechblock half-closing;

-self-induced breechblock lever opening;

-failure to fire due to the fault of firing pin release mechanism.

Ch.3. paragraph 7, p25 Check breech opening during fire or during simulated cannon recoil at distance of 790-900 mm.

During cannon recuperation (counterrecoil) the breechblock must open and the breechblock wedge must take the extreme lower position.

HYDRO-FIRING TEST

99.

During the Hydro Round test fire, after each shot record the length of the recoil of the cradle on the data sheet.

Recoil length should be at the limit of 740-930 mm

30(A) howitzer by hydro-round firing

100.

After each shot, inspect the recoil cylinder and recuperator cylinder areas for leaks of fluid or other damage.

Not Allowed

30(A) howitzer by hydro-round firing

101.

Check the cradle during the recoil.

Visually inspect the top left corner of the breech ring for evidence of scraping on the

Not Allowed

Visually inspect the top left corner of the breech ring for evidence of scraping on the cradle during recoil

102.

Measure the recuperator pressure after firing.

No drop from initial pressure allowed The pressure in counterrecoil mechanism must be 46+2 kg/sm2.

For additional information See ORDER of works for testing of D-30

(A) howitzer by hydro-round firing

103.

Check the muzzle break alignment and looseness.

Use the gauge for muzzle break and canon tube alighnment tool# 14 (Photo 3) UDC-08-060710 Ch.14.2, p/105 Check the fixing of the muzzle recoil compensator. It should be fixed securely by a nut and locked by a spline. The nut should be locked with a stop lock, and stop lock screws and planks tied with a wire. The muzzle recoil compensator must not be loose either in the axial or the radial direction.

IN PROCESS CHECKS

104.

(2) Breaks in cannon and cracks on the cannon exterior surface No breaks are allowed

In process checks.

When painting is removed, exterior surface is visually checked for breaks. No breaks are allowed Verify by the record for ordnance.

105. (3) Dents on the cannon exterior surface Allowed as per schedule 3

In process checks. The external surface is visually examined for dents when painting is removed. Verify by the record for ordnance.

106. (23) Check for rifts, nicks and dents of the cradle surface

Rifts and nicks are not allowed. Dents of up to 5 mm deep and up to 30 mm in diameter are allowed

In process check.

Ch.5. paragraph15, p54 When painting is removed the surface is examined visually for rifts, nicks and dents.

If there are rifts and nicks on the surface of the cradle, the cradle should be replaced (fig.8).

107.

(24) Check for rifts in the recuperator mechanism working cylinders, in the recoil absorber cylinder

Not allowed

In process check.

Cylinders are visually examined when the painting is removed during the overhaul. (Photo31) Ch.5. paragraph.8, p52 Allowable rift sizes admitted for repair:

— in the recuperator mechanism outside cylinder 11 (fig. 9) -not larger than 55x80 mm;

— in the recoil absorber cylinder 14 (fig. 9.1 and 9.2) - not larger than 70x105 mm;

If rifts dimensions exceed those mentioned above, replace the recoil absorber, the recuperator mechanism and the replenisher.

Verify by the record for ordnance

108.

(25) Dents in the recuperator mechanism outside cylinder and in the recoil absorber cylinder

Dents in the recuperator mechanism cylinder are permitted if they do not obstruct the dismantling, assembling and mounting onto the howitzer; dents in the recoil absorber cylinder are not allowed.

In process check.

Visually examine the outside cylinder for dents when painting is removed

109. (29) Dents and rifts in the equilibrator outside cylinder Dents and rifts are not allowed

In process checks. Ch.6. paragraph7, p66Dents and rifts in the outside cylinder 3 shall be repaired.UDC-08-0710 Ch.14 paragraph5.5 p111With the mechanisms dismantled, examine all their components, check theircompleteness and condition. Replace any damaged or worn parts. No rust can be present on theparts.

Rough up any burrs, only removing the elevated metal. The equilibrator outer cylindermay have small dents, provided they do not interfere with assembly and operation.Verify by the record for ordnance.

110. (30) Dents and rifts in the equilibrator inside cylinder Dents and rifts are not allowed

In process check. Ch.6. paragraph7, p66 UDC-08-0710 Ch.14 paragraph5.5 p111 With the mechanisms dismantled, examine all their components, check their completeness and condition.

Check the chrome plating of the inner cylinder; it should not be

Dents and rifts on the inside cylinder 4 (fig. 14) are not allowed In process checks. Verify by the record for ordnance.

111.

(53) Clearance between the inserts and the bottom surface of the cradle guide railings Max 0,97 mm

In process check. Verify by the record for ordnance Ch.2 paragraph9, p21.

Set the cannon in horizontal position. Measure clearance between the inserts and the bottom surface of the cradle guide railings.

The clearance between the inserts and the bottom surface of the cradle guide railings must not exceed 0,97 mm.

112. (5) Breaks and cracks on the recoil compensator

Breaks and cracks are not allowed In process check.

Both chambers (front and rear) of the recoil compensator is examined for breaks and cracks when painting is removed. No breaks and cracks are allowed.

113. (6) Dents on the recoil compensator

Cavity dimensions must not exceed the following: Front aperture walls: surface–

6mm×5 mm, depth - 4 mm;

Rear Aperture; surface –

4mm × 3 mm, depth - 3,5 mm.

In process check. When painting is removed the recoil compensator is visually examined and existing cavities are measured.

114. (56) Initial pressure in the

46-48 kgf/cm

In process check. Chapter 5 paragraph 4 p50

UDC-08-060710

To determine the pressure in the recuperator, do the following:

a) position the tipping part of the howitzer at a descent angle of 3-5°;

b) unscrew caps 58 using wrench A52840-65;

c) open locking valve 59 by ¼ revolution using wrench A72930-53, let out the liquid packing fluid from tube 54 and close the valve;

d) screw in the T-junction; unscrew the plug from one of its spurs and install the pressure gauge in its place;

e) using wrench A72930-53, carefully open the valve by one revolution and read the pressure off the pressure gauge scale, then close the valve. The pressure in the recuperator should equal 46+2 kgf/cm2.

The air (nitrogen) pressure must be within 46—48 kgf/cm2. Verify by the record for ordnance

115. (57) Volume of liquid in the recuperator 9,77-9,97 L

In process check. Chapter 5 paragraph 4 p50 UDC -08-0710 Ch.10 paragraph 3pp 69-70 To determine the amount of fluid in the recuperator, do the following:

UDC-08-060710 - 70 -

a) close the breech block assembly and position the tipping part of the howitzer at a descent angle of 3-5°;

b) unscrew cap 58 using wrench A52840-65 c) open locking valve 59 by ¼ revolution using wrench A72930-53, let out the liquid packing fluid from tube 54 and close the valve immediately;

d) position the tipping part of the cannon horizontally;

e) screw T-junction 2A18.Сб 42-45 into the recuperator seat;

unscrew plug 3 from the T-junction spur and screw the pressure gauge in its place;

f) install the air-hydraulic pump into the trail rack; unscrew plug 34 from cap 36 ,screw in the nipple with the fitting and connect the pump; set the pump to LIQUID (ЖИДКОСТЬ) and pump Steol-M from the mug to the recuperator to retract the cannon until the end face of front magazine 10 is aligned with the first matchmark on the left cradle slide (the matchmarch is labeled zero);

g) use wrench A72930-53 to open the valve by one revolution, read the pressure value off the pressure gauge scale, memorize or write the value down, then close the valve;

h) continue pumping to retract the cannon until the rear face of the front magazine is aligned with the second matchmark on the cradle slide (labeled 250); as a result, the cannon and the recoil absorber cylinders will be retracted by 250 mm.

The cannon can also be retracted by using device 2A18.Сб 42-49

(retractor device) by doing the following: remove locking wire 55

(fig. 19-UDC-7), loosen screw 56 using a screwdriver, remove boltstop 57 and unscrew cap 36 with ring 33 using wrench 2A18.Сб

42-13, install nut 2 (fig. 69 –UDC-07) with screw 3 in place of cap

36 using wrench 2A18.Сб 42-13, install bolt stop 57 (fig. 19 UDC

07) and fix it with screws 56; retract the cannon to the above degree by tightening screw 3 using ratchet 4 i) open the valve to one revolution using wrench A72930-53 and read the pressure gauge

This document is UDC proprietary and includes information that shall not be disclosed outside of GD-OTS and its customers and shall not be duplicated, used, or disclosed – in whole or in part requirement/results References to 122 mm howitzer D-30 (2A18) Guide to the average repair Remarks value again, then close the valve; open the fitting valve and drain the fluid. This will cause the cannon to recuperate and return to the initial position;

j) using the two pressure gauge readings (taken with the cannon retracted to the first and second matchmarks) in the graph (fig. 75

UDC -07), determine the amount of fluid in the recuperator by doing the following:

- on the graph, find the vertical line that corresponds to the pressure in the recuperator with the cannon being retracted to the 250 matchmark;

- on the graph, find the horizontal line corresponding to the pressure in the recuperator with the cannon being retracted to the first matchmark, and extend this line until it intersects with the vertical line described above.

If the intersection point of the horizontal and vertical lines is in the area limited with slanted lines, the amount of fluid in the recuperator is within the norm. The lower slanted line corresponds to 9.77 l of fluid, and the upper slanted line – to 9.97 l.

Verify by the record for ordnance

116. (58) Volume of liquid in the recoil compensator 10,3 L

In process check.

To determine the amount of fluid in the recoil…

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