TANDEM GEAR PUMP TEST/REPLACEMENT

TM 10-3930-673-20-2

18-3. TANDEM GEAR PUMP TEST/REPLACEMENT

This Task Covers:

a. Testing

b. Removal

c. Installation

INITIAL SETUP

Materials/Parts

Tools and Special Tools

Oil, Lubricating, Transmission/Hydraulic (Item 23,

Tool Kit, General Mechanic's: Automotive

Appendix C)

(Item 18, Appendix F)

Rags (Item 26, Appendix C)

Lifting Device, 5 ton (435.92 kg) capacity

Tags (Item 39, Appendix C)

Wrench, Adjustable (Item 21, Appendix F)

Caps and Plugs

Test Equipment

Container, 1 gal (3.8 l) capacity

In-Line Flowmeter (Item 5, Appendix F)

Lockwasher (2)

STE/ICE-R (Item 17, Appendix F)

Preformed Packings (5)

Test Hose (Item 5, Appendix F)

References

Equipment Condition

TM 10-3930-673-10

Wheels chocked

Boom raised and blocked (TM 10-3930-673-10)

Transmission cover removed (Para 16-5)

Hydraulic tank drained

a. Testing.

WARNING

Hydraulic oil in system can be under pressures over 3000 psi (20685 kPa) with engine OFF. ALWAYS

relieve pressure in hydraulic hoses before attempting to remove any component in hydraulic system. With

engine OFF, starter switch in RUN position, and attachment on ground, move control levers through all

operating positions several times to relieve hydraulic pressure. Relieve pressure in hydraulic oil tank by

loosening filler cap very slowly. Failure to follow these precautions could result in serious injury or death

to personnel.

At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injury to personnel.

Allow hydraulic oil to cool before disconnecting any hydraulic hoses.

CAUTION

Wipe area clean around all hydraulic connections to be opened during removal and disassembly. Cap oil

hoses and plug holes. Contamination of hydraulic system could result in equipment failure.

NOTE

If more than one hydraulic hose is to be removed, tag and mark hoses to ensure proper installation. Use

suitable container to catch any hydraulic oil that may drain from system.

Remove caps and plugs as hoses are installed. Wipe all sealing surfaces on hydraulic components and

hoses clean and dry. Apply light coating of clean hydraulic oil to all seals as installed.

Both large pump section and small pump section of tandem gear pump are tested the same way.

18-6