18-11. HYDRAULIC JOYSTICK CONTROL VALVE REPLACEMENT
This Task Covers:
Tools and Special Tools
Compound, Sealing (Item 28, Appendix C)
Tool Kit, General Mechanic's: Automotive
Rags (Item 26, Appendix C)
(Item 18, Appendix F)
Tags (Item 39, Appendix C)
Container, 6 gal (22.71 l) capacity
Transmission cover removed (Para 16-5)
Packings, Preformed (10)
· Hydraulic oil in system can be under pressures over 3000 psi (20685 kPa) with engine OFF.
ALWAYS relieve pressure in hydraulic lines 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 line pressure. Relieve
pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these
precautions could result in serious injury to personnel.
· At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injuries to
personnel. Allow hydraulic oil to cool before disconnecting any hydraulic lines.
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.