Brake System Air - Purge
When the axles are serviced, purge the air from the brake system.
Two people are required to perform the following procedures.
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| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 1 | g00923728 |
Axle Housing (1) Plug (oil filler). (2) Dipstick. (3) Plug (brake wear). (4) Plug (breather and brake wear). (5) Brake cylinders. | |
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| Illustration 2 | g00562305 |
Brake Cylinder (1) Brake cylinder. (6) Breather valve (parking brake). (7) Breather valve (service brake). | |
Purging Air from the Parking Brake
- Place wheel chocks in front of the tires and behind the tires in order to prevent the machine from moving. Start the engine. Move the parking brake switch to the OFF position.
- Move the direction selector switch to the FORWARD or the REVERSE position.
- Slowly push down the accelerator pedal until the machine barely moves. This releases the parking brake.
- Slowly unscrew breather valve (6). When only oil flows out of this port, screw in breather valve (6) .
- Release the accelerator pedal and allow the machine to idle.
- Repeat Step 3, Step 4, and Step 5 for the other three breather valves.
- Stop the engine.
Purging Air from the Service Brake
- Place wheel chocks in front of the tires and behind the tires in order to prevent the machine from moving. Start the machine. Ensure that the direction selector switch is in the NEUTRAL position.
- Push down on the service brake pedal. This engages the service brake by sending hydraulic oil to the brake piston.
- Slowly unscrew breather valve (7) on the rear axle. When only oil begins to flow out of this port, screw in breather valve (7) .
- Release the service brake pedal.
- Repeat Step 2, Step 3, and Step 4 for the other three breather valves.
- Stop the engine.
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