PARKING BRAKE VALVE REPLACEMENT

TM 10-3930-673-20-2

12-4. PARKING BRAKE VALVE REPLACEMENT

This Task Covers:

a. Removal

b. Installation

INITIAL SETUP

Materials/Parts

Tools and Special Tools

Locknuts (2)

Tool Kit, General Mechanic's: Automotive

Preformed Packings (3)

Equipment Condition

Vehicle parked on level ground

Wheels chocked

a. Removal.

WARNING

Ensure wheels are chocked before removing parking brake valve, or injury or death to personnel

could result.

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

Use suitable container to catch hydraulic oil draining from system.