18-3. TANDEM GEAR PUMP TEST/REPLACEMENT
This Task Covers:
Tools and Special Tools
Oil, Lubricating, Transmission/Hydraulic (Item 23,
Tool Kit, General Mechanic's: Automotive
(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
Container, 1 gal (3.8 l) capacity
In-Line Flowmeter (Item 5, Appendix F)
STE/ICE-R (Item 17, Appendix F)
Preformed Packings (5)
Test Hose (Item 5, Appendix F)
Boom raised and blocked (TM 10-3930-673-10)
Transmission cover removed (Para 16-5)
Hydraulic tank drained
· 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
· 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.
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.
· 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.