Allied_Crane_Manual_2.pdf

TECHNICAL MANUAL

OPERATION, MAINTENANCE

SERVICE AND PARTS

MARINE CRANE /

MODEL TB 9-37

TjqD ALLIED MARINE CRANE -'

SHERWOOD, OREGON

MILITARY SEALIFT CQMMAND

T-AGOS-13"'THRU \ 18

CONTRACT NO. N00024-85-C-2046

1 SEP 1987

TECHNICAL MANUAL V A L I DAT I ON CE RT I F I CATE

NAVSEA TECHNICAL M A N U A L NUMBER

TG811-AG-MMC-010/60848

TECHNICAL M A N U A L TITLE

DATE

1 SEP 1987

MARINE CRANE MODEL TB 9-37

CO NT R ACT/MCR NO.

N00024-85-C-2046

I-VA L I DATION

Except as stated in I I , the technical manual identified above has been satisfactorily validated. The technical manual is hereby certified to be accurate and complete, and the information, instructions, text, and illustrations conform in all respects to the applicable general and detailed specifications.

I !-EXCEPTIONS

EXCEPT I 0 NS AUTHORIZED BY

ALL1 ED SYSTEMS COMPANY TECHNICAL PUBLlCATl ON S DEPART MEN T DATE

I S SF? 537

b

DATE 4-22-87 SERIAL NO.1639-40 tl 43

O P E R A T I O N & S E R V I C E I N D E X

80-299 Operation & Service Manual 80-282 A P I Certificate

- - - - - - Operation & Maintenance o f Offsh

- - - - - - Hydraulic Pump Service (I-3155- 80-296 Hydraulic Valve Service

- - - - - - Hydraulic Motor Service (RS 80-313 Gear Reducer (Power Wheel) 80-326 Spring/Hydraulic Brake Serv

- - - - - - Hydraulic Winch Service

-ITHO IN U.S.A. Specifications subject to change withour notice.

OPERATION &

@ SERVICE MANUAL

TB 9-37

MODEL NO.

~iiiedmdRillE A Division 01 Allied Systems Company (Mi:

a

Designers and Manufacturers of Marine Cranes 13985 S.W. Tualatin Shetwood Rd., Shetwood, Oregon 97140 USA Telex: RCA 261985 ASCWAGNER MARINE Telephone: 503/625-2560 Printed in USA FORM 80-209

A W A N T ALLIED SYSTEMS CO. referred to as the Company, warrants i t s products to be free from defects in material and workmanship under normal use in service foi- a period of one hundred eighty (180) days after being placed in service by dealer or user, or within one year from shipment from the factory, whichever occurs first. Within the warranty period, the company will replace, F.O.E. i t s factory, or allow credit a t the current dealer net price, any part that shall be proved defective, to the staisfaction of the Company. Upon the Company's request, all parts claimed defective must be properly identified and returned to the factory, freight prepaid. This policy make:; no allowance for freight, travel, expense or labor. ALLIED SYSTEMS CO. will honor properly documented and described warranty claims ONLY ON UNITS FOR WHICH

A COMPLETED WARRANTY VALIDATION FORM IS

IN THE COMPANY'S POSSESSION AT THE TIME WHEN

SUCH CLAIM IS FILED:

This warranty is expressly in lieu of any other warranties, expressed or implied, including any implied warranty of merchantability of fitness for a specific purpose, and of any other obligations 0 1 liabilities on the part of ALLIED SYSTEMS CO. No person, agent, distributor, or dealer is authorized to assume, for or on behalf of the Company any different or additional obligations in connection with the product. The Company's liability under this Warranty is limited to treatment of parts as set forth in the above paragraph, All other liabilities expressed or implied, arising under statute, through neglect or otherwise, including any warranty of merchantability or fitness for a particular pur-pose are hereby expressly waived.

This Warranty covers only new equipment in the possession of i t s original owner, which after shipment from the factory has not been modified, manufactured upon, altered, fitted with parts other than those specified in the parts book, or improperly repaired in any manner whatsoever, without written consent of the Company. This Warranty is restrict-ed to use within the specified performance rating or capacity in effect a t the time of sale of equipment and excludes equipment which has been abused, misused, or operated under conditions other than those specified by ALLIED

SYSTEMS CO.

Hydraulic and electrical components, engines, batteries, tools and similar equipment not manufactured by ALLIED SYSTEMS CO., are covered only by the standard warranty of the manufacturers of such equipment. Such items are not warranted by ALLIED SYSTEMS CO.

i

HOW TO USE THIS MANUAL

INTRODUCTION

This manual has been prepared to assist you in the operation and maintenance of your Marine Crane. This crane has been engineered and manufactured to the highest quality of workmanship. With proper installation, periodic maintenence maintenance, and operation in the prudent manner, a long life of [rouble-free service should be obtained.

HOW TO USE THIS MANUAL

This manual illustrates service procedures and illustrates service, replacement parts for the crane.

The manual is divided into two sections: The Service Section, with manufacturers service information; and the Parts Section.

The Service Section provides the installation instructions, periodic maintenance requirements, troubleshooting pro-cedures, and service guides for the ciane.

The Parts Section provides all the replacement parts for the entire crane including accessories.

TO LOCATE A SERVICE REPLACEMENT PART FOR

THE CRANE, FOLLOW THE STEPS BELOW.

1. Locate Nameplate

The nameplate is attached to the turret near the hydrau-lic control valve.

2. Note the Serial Number Record the four-digit number. See the example.

3. When ordering replacement G r spare parts, to ensure receipt or correct components, please furnish the following information.

A. Crane Model Number

6. Crane Serial Numoer C. Description of Part D. Part Number E. Quantity Required.

4. To order service replacement parts please contact:

(~ocated In the cab when so equipped 1

' LOAD

CAPACITY

CHART

REEVING

CHART ;hr;

J MODEL DT45-35

SERIAL NO. 5555

MANUFACTURED BY ALLIED SYSTEMS CO.

13985 S.W. TUALATIN - SHERWOOD ROAD

SHERWOOD. OREGON 97140 U S A .

TELEX 151731 ASCMARINE SHOD

ALLIED MARINE CRANE

13985 S.W. Tualatin Shemood Rd.

Shemood, Oregon 97140 USA Telex RCA 261985 ASCWAGNER MARINE Telephone: 503/62!5-2560

Con tents

SECTION 1 INTRODUCTION

Component Identification and Special Instructions Special Instruction Definitions Crane System Requirements

General Pedestal Installation Crane Assembly

Preliminary Crane Startup AeratiodCavitation Noise a t Pump Reeving and Final Operations Crane Operation Safety Precautions

General Hydraulic Controls Winch Operation Hand Signals

HOWTOFIGURE LINEPARTS

Sling Angles

ANGLEINDICATOR-OVERLOAD

Overtoming Overload Conditions

HYDRAULIC OVERLOAD SAFETY SYSTEM

SECTION 2 INSTALLATION

SECTION 3 CRANE OPERATIONS

OPERATING THE CRANE

What is the overload safety system How theoverloadsafety Works How the Unloader Controls the Pilot Relief .

PREVENTATIVE MAINTENANCE

SECTION 4 LUBRICATION AND

LU B R I CAT I ON

General Maintenance Rules Turntable Bearing and Pinion Lubrication .

Lubrication Charts and Lube Points Lubrication Instructions

PREVENTIVE MAINTENANCE

General Maintenance Preventive Maintenance Recornmendat ions .

RECOMMENDED TORQUE VALUES . .

Hydraulic Oil Specifications General Field Maintenance Tracing Hydraulic System Internal Leaks . .

Hoist System Flow Control Adjustments . .

Swing System Flow Control Adjustments . .

Swing Brake Flow Control Adjustments . .

HYDRAULIC SYSTEM MAINTENANCE

HYDRAULIC FLOW CONTROLS

i . . 1 . . 1 . . 2

. . 3

. . 3

. . 3

. . 5

. . 5

. . 5

. . 5

. . 5

. . 6

. . 6

. . 7

. . 9

. . 9

. . 10

. . 11

. . 12

. . 12

. . 12

. . 12

. . 15

. . 15

. . 15

. . 16

. . 17

. . 17

. . 18

. . 18

. . 19

. . 19

. . 19

. . 20

. . 20

. . 21

. . 21

SECTION 5 TROUBLE SHOOTING

General

TROUBLESHOOTING CHART

SECTION 6 SERVICE AND REPAIR

General Test Procedures General Service Procedures W E L D I N G P R E C A U T I O N Hydraulic System Relief Valves

WINCH OPERATIONS

How it Operates

LIFTANDEXTENSION CIRCUITS

SWING CIRCUIT

LIFT CYLINDER TEST AND REPAIR

Piston Packing Test Load Hold Valve Test Cylinder Repair

EXTENSION BOOM CYLINDER TEST AND REPAIR

Cylinder Removal

(Single Exrension Telescoping Booms Only) . .

Cylinder Service Cylinder Removal

(Dual Extension Telescoping Booms Only) . .

Cylinder Service

MANUFACTURERS SERVICE LITERATURE FOLLOWS

THE SERVICE SECTION

294B iii

Section 1 Introduction SHEAVE ASSY 60M PONENT IDENTI FlCATlON

AND SPECIAL INSTRUCTIONS

BOOM EXTENSION

SECTION (PRIMARY/SECONDARV)

TELESCOPING BOOM (TB Series)

WINCH

SWING

SHEAVE ASSV

LIFTING HOOK

SWING GEAR

AND BEARING

SWING PINION

DOUBLE TAPER BOOM (DT Series)

1 I

0 Special Instruction Definitions

This crane has been designed and constructed to meet the highest safety standard of the material handling industry Every effort has been made by the manufacturer to supply an easy-to-operate and dependable crane.

OUS IF OPERATED OR MAINTAINED INCORRECTLY

This crane, as all hydraulically operated mechanical equip-ment, must be operated by experienced personnel ANY

CRANE IS ONLY AS SAFE AS ITS OPERATOR.

This Servce Manual contains instructions on the operation, CAUTION: ALL CRANES ARE EXTREMELY DANGER-p!LGiG] A statement preceded by AWARNING is information that should be acted upon to prevent bodily injury. A WARNING

IS ALWAYS INSIDE A RULED BOX.

CAUTION:

information that should be acted opon to prevent machine damage.

IMPORTANT: A statement preceeded by IMPORTANT is information that possesses special significance.

A statement preceeded by CAUTION is preventative maintenance and servicing of this crane.

Sufficient descriptive material, together with illustrations, are included in the service section to enable the operator to

NOTE:

that will make your job easier.

A statement preceeded by NOTE is information understand the basic crane functions turers publications of major crane componets have been in-

The operator should familiarize himself thoroughly with the contents of this manual before operating the crane, making adjustment, or carrying out any maintenance procedures

In addition, Manufac-c cluded to complete the service information

Section 1 Introduction

Crane System Requirements The following information is Critical to the performance of the crane.

CRANE SUPPLY SYSTEM

G P M ~ 1 PSI[ 1

SWING SYSTEM ~~~1171 PSI 122081 . - ,

NOTE: I f you have questions concerning these ratings, call

ALLIED SYSTEM SERVICE DEPARTMENT (503)625-2560.

Q In order to conform to industry standard practice, the hoses should be connected to the crane hydraulic valve as indicated in the chert below.

Function, in Motion of the operator's hand when actuating the crane hydrau-the control handles.

Raise Boom P u l l Rearward

Lower Boom Push Fo rward

Pu l l Rearward

Lower Load Push Fo rward

Sw ing Right P u l l Rearward

Swing Le f t Push Forward

TELESCOPE Ex tend Boom Push Forward

Retract Boom P u l l Rearward r;;: 1 Raise Load 1

~ _ _ ~ ~ ~ ' 2 Installation

Section

General All effort by ALLIED MARINE CRANE has been made to provide a smooth and satisfactory installation. Be aware of the following information.

1. Have a crane available of the lifting capacity that will safely l i f t the heaviest portion of the crane assembly as indicated on the shipping information.

2. I f the turret is a continuous rotation type, the ladder on the operators platform needs to swing clear of any deck protrusions.

3. A boom should have a boom rest with side ears to stow the boom when the crane is not in use and to assist in the installation procedures. The site for the boom rest and its construction should be located prior to the crane installation.

4. If the turret is a non-continuous type, the turret stops must be oriented in the direction away from the area the crane needs to swing in. Also, the ladder on the operators platform needs to swing clear of any deck protrusions.

Pedestal Installation

TURRET BOLTS AND

Parts Section bolt and pecifications

TURRET . I

SWING GEAR

\ k*' AND BEARING

BEARING BOLT

to specifications or1 < Page 18.)

PEDESTAL

BOLT (See Parts Section for size and torque to specifications on Page 18.)

BOLT-ON

PEDESTAL

WELD F U L L

DEPTH OF

PEDESTAL

PLATE

I WELD-ON

PEDESTAL

Once the crane location has been determined, two procedures can be used to install the pedestal, depending on the custom-er specifications.

BOLT-ON If the crane is to be mounted by means of bolts, they must be of grade 8 strength and should be Cadmium-plated. Corrosion resistant paint should be applied to these bolts before and after installation.

The bolts used must be as per ALLIED SYSTEMS recommen-dations and torqued according to their size as specified by S.A.E. standard. (See Torque Chart, Page 18.)

WELD-ON When welding pedestal to steel decking, always use AWS E701 8 rod. Pre-heat metal to 300°-350° and weld around the base FULL DEPTH OF PEDESTAL PLATE. Make sure you protect any hydraulic hoses or hydraulic components from weld splatter and remove any inflamable liquids from the welding area.

NOTE: Inspect the turret/pedestal fastening bolts for proper torquing. These bolts are set a t the factory and are critical fasteners which hold the crane assembly to the pedestal.

Consult the Parts Section for the size of the bolts and check the torque chart on page 18 for proper torquing.

Crane Assembly

CAPSC REW

(See Parts Section and torque to specifications on page 18.)

TURRET

BOOM END

CYLINDER ROD

END ANCHOR PIN

Follow these procedures to assemble the crane components.

1. Set the base end of the boom lifting cylinder into alignment with the cylinder mounting holes on the turret. The cylinder should be set so that the counter-balance valve is up on top of the cylinder.

Install the cylinder base end anchor pin and secure the :

pin with the keeper bolt. (Some cranes utilize two cy1 inders) .

The cylinder rod end should rest onto supports for the boom installation and no hydraulic hoses should be attached a t this time.

BOOM TRUNNION

BEARING

ASSEMBLIES

CAPSCREW

Torque to specifications

TRUNNION BLOCK

TRUNNION CAP

PIVOT BEARING / - Y e

GREASE FITTIN1

..I.

2. Utilizing the boom lifting eyes, set the boom into the turret trunnion blocks and set the trunnion caps over the boom bearing caps, securing them with the fasteners.

Consult the Parts Section for the bolt size and torque according to the Torque Chart on Page 18.

Set the sheave end of the boom on a suitable Boom Rest.

Remove the capscrew in the boom pivot pin bearing cap and replace with a pipe plug. This capscrew is for ship-ping purposes only.

Section 2 Installation

RAISE CYLINDER WITH COME-A-LONG

3. With the boom in place raise the rod end of the cylinder with the use of a come-a-long until the cylinder rod end and the cylinder anchor of the boom ar aligned. After aligning the cylinder rod end with the boom anchor holes, drive the cylinder anchor pin into place and secure the pin with the keeper bolt through the anchor pin collar and anchor pin.

4. Attach accessories such as platforms, ladders, power packs, seats, operator cages, operator cabs, etc. onto the crane turret assembly in accordance with customers specifications.

All operator cabs should be weatherstripped with 3M Super Weatherstrip Adhesive between the cab and platform.

Caution should be exercized when lowering the cabs so as not to damage any electrical or hydraulic lines.

5. Grease the entire crane assembly in accordance with the chart in the lubrication section of this Service Manual.

6. Attach a l l hydraulic hoses as follows:

A. Winch Hoses - attach the hoses to the winch first (fixed male O-ring ends). Route the hoses down the side of the turret to the control valve (Consult the hydraulic dia-gram in the Parts Section for correct valve connections) and secure the hoses in place at the boom pivot with the hose clamp provided.

B. Attach the cylinder hoses at the cylinder counter-balance valve body in accordance with the hydraulic diagram in the Parts Section. Attach cylinder hoses to the control valve.

C. ( I f applicable to your crane) Attach the hoses to the extension cylinder in accordance with the hydraulic dia-gram in the parts section. Attach the extension cylin-der hoses to the control valve.

D. ( I f applicable to your crane) Attach power pack hoses to the proper fitrings in accordance with the power pack hydraulic diagram in the Parts Section. Attach the pressure and return lines to the control valve.

E. Be sure that all hoses are secured with the supplied clamp locations on the boom, boom pivot, turret,etc.

Consult the hydriwlic diagrams in the Parts Section to be sure that all hoses and drain lines are installed in the correct positions.

CAUTION: Do not overtighten any hoses to their respective fit ti ngs.

F. ( I f applicable to your crane) Consult Section 6 of the Parts Section and install any electrical cables and wir-ing being sure that the cable connectors are attached properly and all wires are installed in accordance with the elect r i ca I diagram (s) .

Install any heater hoses to window defrost hoses.

Install any power pack controls carefully.

Connect any fuel lines tc the power pack in accordance with instruction diagremis in Section 6.

Install any floodlight lamps, operators seat, pilot lines, or wire rope cable guides. Fasten a l l the armored cable onto the hanger clamps provided on the turret. Once all electrical cables have been connected, the supply power (440 VAC ~ 3 Phase) to the entrance box on the pedestal can be connected.

Finally, the circuit breaker in the turret junction box should be OFF for the initial startup of the crane.

I f Power Pack is electric motor - Test for Rotation.

Section 3-Crane 0-peratwns -

Before proceding with the following instructions, refer to any SPECIAL INSTALLATION INSTRUCTIONS that are applicable to this crane model

0 -

Preliminary Crane Startup 1 . Check each piping connection for tightness (DO NOT

OVERTIGHTEN.

2. Trace the hydraulic systems with the diagram(s) that are in the Parts Sections to verify proper installation

3. Check all hydraulic, fuel, coolant, lubrication levels to insure adequate operating conditions.

LEVELS in air cleaners and crankcases are as per the manufacturers specifications.

4. Operate all control valve handles to insure that they return to neutral position when released.

5. Refer to any power pack operators manual and in-structions and start the power pack, or engine. The engine should be running smoothly and at half throttle before attempting any crane operations.

pressure gauges to be sure they have attained the specified pressures and flow in accordance with the hydraulic specifications of the crane system require-ments (See Page 2.)

NOTE: On some engine starting circuits an anti-starting switch is uti!ized to prevent engine startup accidentally.

In such cases, the winch lever will require pushing forward and holding while the ignition key is turned to the start position. Once the engine is started, the winch lever must be released or else cable will be payed out.

Be sure any OIL

Check all

In ,the case of ELECTRICAL POWER PACKS, be sure the motor is wired correctly for proper rotation.

6. While the engine is running (or motor operating) check all gauges for proper function and reaching specified operating levels.

draulic control valve and check all connections. Verify again that all hydraulic lines are sealed by slowly operating the crane functions.

the boom slowly; pay winch line out for reeving; ( i f applicable to your crane) extend and retract the boom.

9. In accordance with the operators instructions, shut of f the power supply.

operations if the power supply continues to run.

e

7. Check the hydraulic system for leaks. Observe the hy-

8. Swing the crane slowly left and right; raise and lower

If necessary, apply emergency

Aeration/Cavitation Noise at Pump

Cavitation results when the pump is trying to pump more fluid, than i t is receiving through the suction line.

Aeration results when excessive air is mixed into the hyd-raulic fluid. Sound of aeration or cavitation i s very similar Slight aeration or cavitation sounds as i f the pump were skipping or chips were passing through. In worse cases, the pump may run with a jerky or uneven movement and sour/d as if gravel was mixed in with the fluid.

CAUTION: Cavitation is a dangerous condition that can quickly destroy the pump and other components. SHUT THE

HYDRAULIC SYSTEM DOWN BY STOPPING THE ENGINE

OR ELECTRICAL MOTOR AND CORRECT PROBLEM

EMMEDIATELY. Refer to the manufactuers corrective instructions and warnings.

Reeving and Final Operations

After running the crane for some time and watching for leakage, winch out the wire rope and reeve the hook block or lifting device to the proper number of line parts desired.

Be sure to pass the wire rope through any cable guides or set the wire rope into place on the weight load indica-tor (if utilized). If there is a counterweight assembly on the sheave assembly, be sure that the end of the counter-weight is looped on the wire rope coming off the last load sheave, and the weight is sliding freely the length of the rod so that the microswitch is activated properly.

I f the crane is equiped with electrical accessories, turn the circuit breaker to the ON position.

WARNING

Make sure the power to the crane is OFF A before opening the circuit box.

Start the crane power and check the warning lights and any other electrical accessories.

Crane Operation Safety Precautions An experienced operator should familiarize himself with the unit before attempting any type of crane operation.

h e crane should be checked for obvious defects.

A WARNING

A N e v e r allow anyone under the load.

Never swing over personnel A Always wear appropriate head gear. A When moving the boom, the operator should always be A sure the boom has a clear swing radius.

Always operate within the capacity of your crane and its reeving components.

In case of hydraulic pressure line breakage, do not attempt to stop the leak with any part of the body or the use of the hand. High pressure hydraulic fluid could cause serious physical damage.

Do not operate a crane near electrical cables without extreme caution.

A A A

OPERATING THE CRANE

Genera I During operation, the handles should be metered slowly when starting or stopping an operation in order to prevent high stresses on the equipment. All movements must be smooth to avoid jerking. Extra caution should be taken when the boom is a t its full horizontal position or when moving the load.

to neutral position or to be held in full open position after a cylinder has reached maximum travel, in either direction. Th is will cause excess strain on the hydraulic components, and will cause oil to flow through the relief valve creating a heat problem.

Do not allow the handles to “snap back”

Sect ion 3 Crane Operations

An experienced operator should perform the various crane functions to develop a "feel" for the controls. The valve controls are designed to return to their neutral position when released. When control levers are released and the hydraulic system is properly serviced and maintained, all motion functions of the crane should stop immediately.

Hydraulic Controls The illustration below shows the various hydraulic lever and and their crane functions.

RIGHT

LOWER

SWING

RAISE

BOOM EXTEND

TELESCOPE

WINCH

WALK-AROUND

CONTROLS

WINCH LOAD UP J K /

TELESCOPE RETRACT

BOOM UP ctiiir.ir

WINCH LOAD DOWN

TELESCOPE EX 4

Winch Operation

When winding the line back on the winch drum, or re-placing the cable, avoid tangled "Bird Nests" and trapped loops. I f the line is to be spooled without a load, have a constant tension to the line to ensure even winding. The downhaul weight on the swivel hook or multi-part hook block should maintain a tension on the load line when the boom is raised and the line is paid out.

WARNING

National standards require that a t least four wraps of cable must be on the drum for any lifting or pulling opera-tions. CABLE CLAMPS ARE NOT

DESIGNED TO HOLD LOADS.

TEND

CABLE

WEDGE

E l

BIRD NEST WRAP

(not acceptable) a

SITTING CONTROLS

TRAPPED LOOPS

(not acceptable)

Section 3 Crane Operations--- ~

HAND SIGNALS

These hand siqnals are internationallv standard and should be used in clear vision of the crane operator.

WARNING

Be sure that the signal person IS clear of the load, boom, or hook, to prevent bodily injury.

'HOIST - With forearm vertical, forefinger pointing ,up, move hand in small horizontal circle.

RAISE BOOM - Arm extended, fingers closed, ' thumb pointing upward.

RAISE THE BOOM AND LOWER THE LOAD -

With arm extended, thumb pointing up, f lex fingers in and out as long as load movement is desired.

MOVE SLOWLY - Use one hand to give any motion signal and place other hand motionless in front of hand giving the motion signal.

as example.)

(Hoist slowly shown

U

LOWER - With arm extended downward, forefinger pointing down, move hand in small horizontal circle.

LOWER BOOM - Arm extended, fingers closed, thumb pointing downward.

LOWER THE BOOM AND RAISE THE LOAD -

With arm extended, thumb pointing down, flex fingers in and out as long as load movement is desi red.

Section 3 Crane Operations

EXTEND BOOM - (Telescoping Booms) Both fists in front of body with thumbs pointing outward.

EXTEND BOOM (ONE HAND SIGNAL) -

(Telescoping Boom) thumb tapping chest.

One fist in front of chest with

SWING - Arm extended point with finger in the direction of swing of boom. (LH swing shcwn)

STOP - Arm extended, palm down, hold posi-tion rigidly.

RETRACT BOOM - (Telescoping Booms) in front of body with thumbs pointing inward.

Both fists

RETRACT BOOM (ONE HAND SIGNAL)

(Telescoping Boom) chest, thumb pointing outward and heel of fist tapping chest.

One fist in front of

DOG EVERYTHING - Clasp hands in front of body.

EMERGENCY STOP - Arm extended, palm down, move hand rap.idly right and left.

Section TCrane O p e 2

, 7

HOW TO FIGURE LINE PARTS

To help fiqure the number of parts of line to be used for following ratio table is provided with examples of how to

4.71 5.60 6.47 7.32 8.16 8.98 a given lo id or the line pull use it.

RATIO FOR

OF LINE BEARING

Example:

1 PART

OF LINE

2 PARTS

OF LINE

3 PARTS

OF LINE

4 PARTS

OF LINE

5 PARTS

OF LINE

USING THE RATIO TABLE RATIO FORMULA

= RATIO TOTAL LOAD TO BE LIFTED

SINGLE LINE PULL I N POUNDS

Example:

To find the number of parts of line needed when weight of load and single line pull is established.

Sample Problem: Sample Problem:

72,480 Ibs. (load to be lifted) 8,000 Ibs. (single line pull) = 9.06 RATIO Refer to ratio 9.06 in table or number nearest to it, then check column under heading "Number of Parts of Line" . . .

11 parts of line to be used for this load.

To find single line pull needed when weight of load and number of parts of line are established.

68,000 Ibs. (load to be lifted)

6.60 (ratio of 8 part line) = 10,300 Ibs. (single line pull) 10,300 Ibs. single line pull required to l i f t this load on 8 parts of line.

Sling Angles

15'

Oecreasing the angle between the sling leg and horizontal in-creases the stress on each leg of the sling even though the load stays the same.

ANGLE INDICATOR - OVERLOAD

The ANGLE INDICATOR is mounted on the boom in view of the operator. The POINTER which is controlled by gravity will indicate the ANGLE of the boom as it is raised from Oo to the maximum angle (85O).

In order to calculate the CRANE'S CAPACITY at any ANGLE shown on the INDICATOR, proceed as follows:

1. Position the hook directly over the load, NOTE THE

ANGLE. Then move the crane to where the load will be deposited. NOTE THE ANGLE. The SMALLEST of the two ANGLES is then compared with the HYDRAULIC CAPACITY CHART (See Hydraulic Capacity Chart as provided by Allied Systems in front of the Service Section.)

2. On the HYDRAULIC CAPACITY CHART find the ANGLE of the boom, then read the WEIGHT listed for that ANGLE

3. Check the REEVING CHART (Inserted just prior to these instructions) to determine that there are the correct number of LINE PARTS to handle the load safely.

4. I f the HYDRAULIC CAPACITY CHART and the REEVING CHART show that the load can be handled safely, move the crane back to the load and hook up.

(See Slings Page 9.) .

Example:

STEP 1 - Know the weight of the LOAD to be lifted.

STEP 2 - Position the hook over the load.

STEP 3 - Move the crane to where the load will be delivered.

STEP 4 - Compare the SMALLEST ANGLE (45O) with the

For example assume 4.,900 Ibs.

NOTE THE ANGLE. For example 60°.

NOTE THE ANGLE. For example 45O.

HYDRAULIC CAPACITY CHART to find that the cranes hydraulic capacity will pick up a load of 5,000 Ibs. (example) at 45O.

INDICATOR is now a t 60° and the HYDRAULIC CAPACITY CHART shows the crane can pick up 6,400 Ibs.

(example) a t 60°.

STEP 6 - Check the REEVING CHART. If you have for example %" diameter WIRE ROPE and a TWO PART LINE, the REEVING CHART could show that the wire rope could hold 8,000 Ibs. with a 5: 1 SAFETY FACTOR.

CAPACITY (5,000 Ibs.)

STEP 5 - Move the crane back to the load. The ANGLE

STEP 7 - Subtract the LOAD from the HYDRAULIC

5,000 I bs.

-4.900 Ibs.

= l00Ib.

STEP 8 - Subtract the LOAD from the REEVING (8,000 Ibs.)

8,000 Ibs.

4,900 Ibs.

=3,100 Ibs.

STEP 9 - Now you know .that the LOAD is under the HYDRAULIC CAPACITY by 100 Ibs.,and that the REEVING exceeds the LOAD by 3,100 Ibs. So it is safe to go ahead and l i f t the load.

NOTE: A t NO TIME should the crane's load be allowed to swing out to a larger load radius than is indicated safe on the

HYDRAULIC CAPACITY CHART.

Bverco m i ng Overload Conditions When the crane is in the overloaded condition, the crane can not:

SWING FROM SIDE TO SIDE

BOOM DOWN

EXTEND THE TELESCOPE BOOM

WINCH UP

When the crane is in an overloaded condition, there are three methods of returning to a nonoverloaded condition. To return to normal operation use one of the following procedures.

1. Raise the Boom to a shorter load radius

2. Lower the load to the deck with the winch and divide the load.

3. Retract the Boom (Telescopic Booms only) to a shorter radius.

OVERLOAD - BOOM

WILL NOT LOWER

DOUBLE TAPER

(DT Series Booms)

LONG RADIUS SHORTER RADIUS

POWER

BOOM UP

LOAD O.K.

POWER BOOM UP

TELESCOPING 4 RETRACT UNTIL

(TB Series Booms)

OR

LOAD I S O.K.

LONG RADIUS SHORTER RADIUS

HYDRAULIC OVERLOAD SAFETY SYSTEM

What is the Overload Safety System

The hydraulic overload safety system prevents boom lowering or winching up (with any given load) a t a radius that creates an overload condition. When this happens, the hydraulic system automatically locks the boom in place and the winch in a brake condition. The operator retains the ability to raise the boom to reduce radius, or to lower the load with the winch.

The basic components of the safety system are as follows:

( 1 ) Unloading Valve

(2) Pilot Control Line

(3) Flow Control Valve

(4) Pilot Port Relief

(5) Load Hold Valve

(6) Boom Cylinder

(7) Control Valve

(8) Boom Pressure Cylinder Gauge

How the Overload Safety Works The hydraulic overload safety system is controlled by the boom cylinder pressure. The unloading valve, item ( l ) , senses the hydraulic pressure in the boom cylinder, Item (61, through the pilot control line, item (2). When the pressure exceeds a the unloader valve setting, item ( 1 ),the unloading valve opens to allow oil to flow from the pilot port relief valve, item (41 to the tank.

NOTE: If the Boom Cylinder is at i ts lowest point (bottomed out), the Overload System will not operate.

How the Unloader Controls the Pilot Relief

When the oil flows from the pilot port relief valve, item (41, the pressure drops and the pilot port relief valve opens to divert the oil from the output port of the control valve, item ( 7 ) , to the return channel of the control valve, back to the hydraulic tank.

I f the flow control valve, item (3). i s shut off, the overload safety system and the hoist pressure, item (8). will not work.

This can easily be checked by changing the load on the boom and observing the hoist cylinder gauge, item (8). I f a change of load does not vary the pressure reading of the gauge, the flow control valve, item (3 ) . i s closed too tight. I t should be open one quarter (1 /4) turn or until the pressure changes showing on the hoist pressure gauge.

NOTE: This flow control valve, item (3), may also be used to isolate the system in order to make the crane overload tests. Be sure that valve is reset to original position for normal operation.

PI LOT FLOW

CONTROL VALVE

NOTE: SYSTEMS SHOWN ARE TYPICAL

From Pilot Relief of WINCH.SWING.

or TELESCOPE control valves sections

CONTROL

To Pilot Flow Control Valve (3)

HIGH PRESSURE

LOW PRESSURE (return)- --

PRESSURE (NO FLOW)

control valve

PUMP PRESSURE

BOOM UP

BOOM

PUMP PRESSURE -TO TANK

OVERLOAD

BOOM UP ONLY

OVERLOAD

BOOM DOWN ONLY 13

Section 4 Lubrication and Preventative Maintenance I

LU BR lCATl0 N General Marine cranes are lubricated at the factory prior to shipment.

We recommend a thorough inspection of all lubrication points as a safety measure. Periodic lubrication is necessary to insure long l i fe and proper function of the crane components.

Required frequency of lubrication varies with application and amount of use. The lubrication chart show lube points, and frequency of lubrication required.

Maintenance Rules

1. Service components of the crane in a clean work area, that is dust-free. This is of utmost importance when servicing any hydraulic equipment.

2. Inspect all replacement parts, prior to assembly, to detect any damage which might have occured in operation or in shipping.

3. Use only manufacturer certified replacement parts for the the best results.

Never re-use expendable parts such as oil seals, back-up rings, O-rings, etc. Although they may appear to be in good condition, they can be defective.

4. Clean all metal parts with diesel oil or an approved cleaning solvent, and inspect al l machined surfaces for excessive wear or damage before reassembly of parts.

5, Lubricate all O-rings and oil seals with an approved petrol-eum jelly or lubricant prior to installation.

CAUTION: Do not usecleaning solvents on any hydraulic o-ri ngs, seal s,or packing.

Turntable Bearing and Pinion Lubrication

1. TURNTABLE BEARING The turntable bearing is externally lubricated by means of zerk fittings around the bearing ring. It is necessary to distribute the grease into the shear-ball portion of the bearing by injecting grease through the fitting as the crane is rotated. The crane should be rotated from the left to the right as far as possible and one (1) pump of an authorized grease gun should be applied in 30 degree intervals as the crane is rotated in i t s full swing.

Lithium base greasewith EP additive and rust inhibitors is acceptable. A No. 2 grade should be used at temperatures above 32 degrees F. and a No. 1 grade should be used below 32 degrees F.

Lubricate the turntable bearing at least once each month.

Under extremely severe working conditions, sufficient grease should be added to flush out contaminated grease. '

2. SWING GEAR PINION. Lubrication of the swing gear pinion(s) and the gearing around the face of the turn-table bearing is accomplished through the access in the pedestal. I t is necessary to distribute the lubrication around the gear face of the turn-table bearing and pinions.

I 1

WARNING

Turn off power supply to prevent accidental activation of the hydraulic A control levers.

CHEVRON

SRI N o 2

Lubrication Points and Charts - NOTE: Lube point numbers refer to Lubrication Charts and Lubrication Instruction Paragraphs.

ISCOPING BOOMS

*CLOSED TYPE RING GEAR ONLY,

Pocoht So hit ran Alvania EP No. 1 EP No. 2 EP No. 2 EP No. 742

MOBIL TEXACO UNION OIL SUNOCO

Mobilux Mutifak Unoba Presige EP No. 2 EP No. 2 EP No. 2

DOUBLE TAPER BOOMS

CHEVRON

Pinion

MS

CONTROL VALVE LINKAGE (NOT SHOWN)

LUBRICATE WITH A GENERAL. PURPOSE

20W OIL AS NEEDED.

SOHIO SHELL

Sohitac Omala No. 150

MOB1 L TEXACO SUNOCO PURE

Mobil Crater No. 407 Poco TAC-E Compound Compound Gear

5 X Fluid Shield

MOBlL

Mobilube

H D 8OW-90

SHELL

Stirex No. 85140

Section 4 Lubrication and Preventative Maintenance-

Lubrication Instructions TURNTABLE BEARING - Grease the race through any fitting as the machine is rotated. (Preferably every 30°) Rotate a t least two complete revolutions. When complete rotation is not possible, use each fitting, rotating the crane back and forth as far as possible as each fitting is greased. Lithium based grease with EP additives and rust inhibitors are recommended. A No. 2 grade grease should be used at temperatures above 32oF. and a No. 1 grade grease a t below 32OF.

PINION AND RING GEAR -

OPEN TYPE RING GEAR - Lubricate weekly or as required. Inspect daily.

as required. Inspect CLOSED TYPE RING GEAR - Lubricate yearly or

BOOM PIVOT - Lubricate before each 8 hour shift or daily as required.

SHEAVE PINS - Lubricate before each 8 hour shift or daily as required. Add until grease appears a t each end of pivot pin. @

WINCH CABLE AND HOOK - Oil with a light penetrating oil to prevent internal friction. When Qperating in extreme climates, wipe cable dry to prevent buildup of foreign material. The inspection, lubrication, care and maintenance of the winch cable should comply with current safety rules as specified by local, state, and federal regulations.

CYLINDER PIVOT PINS - Lubricate before each 8 hour shift or daily as required.

BOOM ANGLE INDICATOR - Lubricate as needed.

I f arrow sticks when boom is raised, remove indicator arrow and clean assembly. Then relube.

SWING GEAR REDUCER - The oil level in the swing drive gear box should be checked monthly i f there is no sign of leakage. The fill plug and the level plug are locat-ed on the top of the gear box and the oil must be visible in the level plug. I f there is any visible leakage around the gear reducer assembly the unit must be serviced and resealed. Also check the swing gear pinion for wear.

Lubricate as needed. I f the boom jerks during exten-sion or retraction apply several squirts of grease to the wear pads as boom is moved in and out slowly.

NOTE: In sandy areas the pads should be dry.

WEAR PADS (TELESCOPE BOOMS ONLY) -

PREVENTIVE MAINTENANCE

General Maintenance Marine Cranes are designed and built to give many trouble free hours of operation, however, any piece of equipment is only as good as the operator or maintenance man.

"Common Sense" maintenance and good servicing wil I reduce costly down time. Follw maintenance and lubrication schedules, give the crane a "Walk Around" inspection before operation; keep bolts, nuts, fittings, etc., properly torqued Replace worn or damaged hydraulic hoses.

In most applications, some seating of bolt threads and mating surfaces will occur during initial hours of machine operation.

Bolts should be retightened after initial break-in period.

Periodic checking and retightening of fasteners is advisible regardless of any locking device which might be used.

Seating of threads may lead to loss of bolt tension even though the capscrew or the nut has not rotated. Failure to keep bolts properly tightened may lead to fatigue failure of bolts and consequent machine damage. Check all nuts and bolts on rotation gear box and turn table bearing for proper torque. (See Torque Chart on Page 18.)

Clean Filter Area - Clean filter area to prevent dirt from entering tank.

Clean Breather Cap - Breather cap on hydraulic reservoir tank should be cleaned ever 250 hours of operation (or.

more often as required). Clean with solvent and use air to blow dry. Cleaning allows system to breathe without taking in added dirt from a clogged breather line.

Remove and Clean Filter Screen - Filter screen under the breather cap should be cleaned every 1000 hours to 180 days service. Remove screen from tank, wash with solvent and use air to blow dry. Be sure the screen i s not damaged and make sure i t is ALWAYS in place.

Return Line Filters - (EXTERNAL LINE FILTERS) Change filter cartridges every 250 hours of operation or when filter gauge shows 15 PSI after oil is warm. When changing the filter cartridges, make sure the groove is clean and the "0"-ring is properly seated. Do not overtighten the retaining bolt.

This will damage the "0"ring and cause leakage. Install new seals and gaskets with each new cartridge change.

FI L l

O-RING

VI v BY PASS VALVE

BOLT

NOTE: For IN-TANK filters see manufacturers publications a t end of Service Manual.

SEAL

FILTER

ELEMENT

CHANGE

FILTER

Preventive Maintenance Recommendations TURNTABLE MOUNTING BOLTS - The crane turntable bearing mounting bolts must be checked after three (3) to four

(4) hours of operation. Thereafter check the tightness of the proper bolt torque every 500 hours of operation.

The winch gear box and drive motor bolts must be checked for tightness every six (6) months.

FASTENERS AND CAPSCREWS - All fasteners and cap-screws must be checked for tightness every six (6) months.

All hydraulic fittings and hose connections must be visually inspected for tightness every thirty (30) days and tightened as required to prevent leakage. Replace any hose or fitting that is leaking during operations that cannot be corrected by normal tightening.

HYDRAULIC CYLINDER - The hydraulic cylinder must be

. checked every thirty (30) days for leakage around the cylinder

WINCH GEAR BOX AND DRIVE MOTOR MOUNTING -

HYDRAULIC FITTINGS AND HOSE CONNECTIONS -

rod or around the packing gland. I f there is excessive leakage around the cylinder rod, repair must be performed.

Check the packing gland bolts for tightness to prevent leakage every thirty (30) days. I f there is any leakage around the gland, repair procedures must be performed. See Repair Section 6, Page 26.

BOOM HOIST CABLE - The total length of the hoist cable must be checked every ninety (90) days for fraying, proper drum security and for hook wear, cracks or worn compon-ents. I f any fraying or broken cable strands are found, the entire cable must be r e p l i ~ ~ d .

The inspection, care, and maintenance of the winch cable should comply with current safety rules as specified by the U.S. Coast Guard. Federal. State and Local regulations

RECOMMENDED TORQUE VALUES

For SAE Grade Capscrews and Bolts.

Torques listed are suggested values on parts carrying residual oil of manufacture.

These values apply to CADMIUM PLATED AND LUBRICATED Darts.

SAE %I S0C

I DENTI FlCATlON

S.A.E GRADE 8

(Used for Load Carrying bolts only)

S.A.E. GRADE 5

(General pupose bolts)

BOLT SIZE

1/4-20

114-2EI

511 6-1 8 511 6-24

318-1 6 3/8-24

711 6-1 4 711 6-20

112-1 3 1/2-20

9116-1 2 911 6-1 8

518-1 1 5/8-18

314-1 0 314-1 6

718-9 718-1 4

1-8 1-12 1-14

1 114

1 112

TORQUE

S.A.E.

GRADE 5

7 ft.-lbs.

8 ft.-lbs.

14 ft.-lbs.

15 ft.-lbs.

24 ft.-lbs.

28 ft.-lbs.

40 ft.-lbs.

44 f t . - I ts .

60 ft.-lbs.

82 ft.-lbs.

88 ft.-lbs.

96 ft.-lbs.

120 ft.-lbs.

144 ft.-lbs.

216 ft.-lbs.

240 ft.-lbs.

31 5 ft.-lbs.

370 ft.-lbs.

475 ft.-lbs.

520 ft.-lbs.

525 ft.-lbs.

1005 ft.-lbs.

1740 ft.-lbS.

S.A.E.

GRADE 8

10 ft.-lbs.

12 ft.-lbs.

21 ft.-lbs.

24 ft.-lbs.

36 ft.-lbs.

40 ft.-lbs.

60 ft.-lbs.

63 ft.-lbs.

84 ft.-lbS.

96 ft.-lbs.

124 ft.-lbs.

136 ft.-lbs.

168 ft.-lbs.

192 ft.-lbs.

310 ft.-lbs.

338 ft.-lbs.

490 ft.-lbs.

550 ft.-lbs.

768 ft.-lbs.

800 ft.-lbs.

813 ft.-lbs.

1680 ft.-lbs.

2920 ft.-lbs.

3600 ft.-lbs.

Section 4 LubriGKon-and Preventative Maintenance

MINIMUM

TEMPERATURE BRAND NAME

HYDRAULIC $YSTEM MAINTENANCE

MAXIMUM

TEMPERATURE * *

Hydraulic Oil Specifications 0 Allied Marine Cranes are tested with Mobil DTE 13 or 15 hvdraulic fluid with rust and oxidation inhibitors.

Operating temperatures based on Commercial Shearing pumps, showinq the temDerature ranqe of some hydraulic fluids usinq:

MOB1 L DTE 15

SAE Grade 10

SHELL Tellus 33

SAE Grade 20

Any equivalent grade of hydraulic fluid may be used.

- 00 + 22OoF

- 00 + 194OF

+ 250 + 220°F

+ 200 + 215OF

(50 S.U.S. 'minimum a t operating temperature) (7500 S.U.S. maximum a t starting temperature)

I M O B I L D T E 13 I -10' I +185OF I

NOTE: Before starting the crane for the first time or when pumps or filters are removed for maintenance

PRIME all pumps and filters

CHECK tank for adequate supply of hydraulic fluid.

*"Maximum temperature of 18OoF. (82.2OC.I RECOMMENDE Higher temperatures will result in rapid oil deterioration.

It is recommended that 5% MOBlL VAPOR TEC be used in the hydraulic systems to prevent corrosion of metal caused by moisture in the hydraulic tank. This moisture can be transfered to cylinders or other components of the hydraulic system, and can cause rapid deteriation of seals and O-rings.

D.

General Tkis crane has been functionally tested for conformance to IN-OPERATION CARE

Proper In-Operation care of hydraulic fluid includes

1. Prevent contamination by keeping the system tight and using proper air and fluid filtration.

2. Establish fluid change intervals so the fluid will be replaced before i t breaks down. I f necessary, the supplier can test samples in the laboratory at intervals to help establish the frequency of change.

3. Keep the reservoir filled properly to take advantage of its heat dissipating characteristics and prevent moisture from condensing on inside walls.

4. Repair all leaks immediately.

5. Watch filter indicators and replace In-Tank filter elements

6. Clean or replace wire mesh suction filters every 6 months.

all, specifications a t the factory. I t is recommended that Mobil DTE 13 or 15 hydraulic fluid or its equivalent be used for normal working conditions.

Field Maintenance Hydraulic fluid of any kind k n o t an inexpensive item.

Changing the fluid and flushing or cleaning improperly maintained systems is time consuming and very costly.

Therefore, it is important to care for the fluid in the proper manner.

STORAGE AND HANDLING

?e following rules should be used to prevent contamination of the fluid during storage and handling.

I: Storedrums on their sides. I f possible, keep them inside or or return line filters. See Return Line Filters, page 18.

under a roof.

I 7. Tank should be full, check sight glasses BEFORE daily operation of crane, with all components, booms, etc. I stowed.

2. Before opening a drum, clean the top and the bung (plug) , thoroughly so no dirt can enter.

8. Extreme caution must be taken when removing the tank 3. Use only clean containers, hoses, etc. to transfer the fluid from the drum to the hydraulic reservoir. An oil transfer pump equipped with a 25 micron filter is recommended. cover to prevent dirt and foreign objects from falling into the tank. Clean the area around the filler and access hole Keeping the Fluid clean and free from moisture will help it last much longer and avoid contamination damage to close-fitting parts in the hydraulic components.

BEFORE removing cover.

Tracing Hydraulic System Internal Leaks

INSTRUMENTS - Flow rate, pressure and temperature mea-surements are required in evaluating the performance of the hydraulic components. All three can be helpful in setting up or troubleshooting a hydraulic system. Due to the difficulty in installing a flow meter in the circuit, flow measurements can often be determined by timing the travel or rotation of an actuator. Pressure and temperature are determined in the usual manner by means of gauges and thermometer.

PRESSURE GAUGES - Pressure gauges are supplied on each crane for adjusting pressure control valves to required values and for determining the forces being exerted by cylinder(s).

The pressure gauges register the main hydraulic control valve pressures and the cylinder overload valve pilot system.

(See hydraulic schematic) INTERNAL LEAKS - The first reference to consider for im-proper hydraulic system operation should always be the system Troubleshooting Chart on page 23. Where references are made in the chart to pump speed setting and hydraulic relief valve setting, consult the final test listings on page 2. I f after a thorough inspection the trouble is not detected or corrected within those Units. it is likely that an internal leak has developed due to worn parts.

Internal leaks are usually evidenced by extremely slow opera-tion and boom creep when the boom is loaded near its rated capacity and careful adjustment of hydraulic com-ponents fails to remedy the situation.

MAIN RELIEF - (See Manufacturers publications a t the end of this Service Section for further instructions). The hydraulic system is equipped with adjustable relief valve(s) mounted on INLET and MID-INLET SECTIONS of the hydraulic valve.

These relief valves are pre-set at the factory and should not be disturbed unless replaced or the valve serviced.

NOTE: Operating pressure will not build up until a control valve is held open,with the cylinder actuated by the control reaching the end of i t s stroke. The relief valve may be checked with the system pressure gauge or a test gauge connected to the inlet of the control valve. With the system in operation a t the normal operating temperature, actuate the boom control to DOWN position while (observing the gauge. I f the hydraulic pressure does not relieve at the proper pressure, the main relief valve can be adjusted in the following manner:

1. ( I f applicable) remove the relief valve locking cap.

2. Loosen the locking nut from the relief valve.

3. Actuate the boom conirol handle in the DOWN position.

4. Use a screw driver and turn the adjustment screw clockwise to increase pressure or counter-clockwise to decrease. Make adjustments slowly while observing the gauge.

CAUTION: SET RELIEF VALVES PROPERLY.

OPEN CENTERED VALVES should be set 50 PSI higher than the required pressures. This assures enough pressure to l i f t the maximum load and s t i l l not damage any hydrau-

0 lic components.

CLOSED CENTER VALVES should be set 250 PSI higher than the required pressures

HYDRAULIC FLOW CONTROLS

Hoist System Flow Control Adjustments Swing System Flow Control Adjustments

NOTE: Since the Load Lock Valves are PRE-SET AT THE FACTORY, no adjustments are necessary.

USE THESE PROCEDURES FOR VALVE REPLACEMENT

ONLY.

The flow controls in the swing system are used to restrict oil on the return side of the motor only (See illustration below).

By controling the flow of oil when swinging the crane either left or right, you can control the maximum speed of the swing operation of the crane.

How to make the adjustments

1. To slow the swing operation, turn the adjustment stem of the flow control valve clockwise.

2. To speed-up the swing operation, turn the adjustment stem of the flow control valve counterclockwise.

NOTE: Both valves must be adjusted equally to obtain the same speed when swinging the boom right or left.

The pressure control in the hoist system IS used to prevent boom lowering without power. By controling the pressure of the oil when retracting the cylinder and lowering the boom assembly you can control the lowering speed and smoothness of the operation.

How to make the adjustments

1 .

2.

To increase the hydraulic pressures (hold loads), turn the adjustment screw clockwise.

To decrease the hydraulic pressures (release loads), turn

FREE FLOW

PRESSURE

the adjustment screw counterclockwise.

CAUTION: The adjustment screw has no internal stop and may be blown OUT if unscrewed too far.