HYDRAULIC SYSTEM SERVICE

TM 10-3930-673-20-2

18-2. HYDRAULIC SYSTEM SERVICE

This Task Covers:

a. Purging air from piston pump.

b. Purging-air from tandem gear pump.

INITIAL SETUP

Materials/Parts

Tools and Special Tools

Oil, Lubricating, Transmission/Hydraulic (Item 22,

Tool Kit, General Mechanic's: Automotive

Rags (Item 25, Appendix C)

Cap and Plug Set (Item 3, Appendix F)

Tags (Item 38, Appendix C)

Container, 1 gal (3.8 l) capacity

Equipment Condition

Transmission cover removed (Para 16-5)

Personnel Required

Wheels chocked

Two

References

TM 10-3930-673-10

a. Purging Air from Piston Pump.

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.

To prevent internal damage to piston pump ensure pump housing is filled with oil before beginning

purging procedures.

NOTE

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.

Piston pump supplies hydraulic pressure to the attachment cylinder assembly, carriage tilt cylinder,

and fork sideshift cylinders.