| |
| Illustration 1 | g03676341 |
Note: The parking brakes are spring-applied. The parking brakes are released by brake oil pressure that is stored in the secondary brake accumulator. The brake oil pressure in the secondary brake accumulator is developed when the engine is running.
The parking brakes will engage when any of the following conditions are met:
- Shift control lever (5) is in the P position.
- Engine start switch (4) is in the OFF position.
- The brake oil pressure from the secondary brake accumulator is exhausted.
|
Parking Brake Indicator (3) - When the parking brakes are applied, the parking brake indicator will illuminate. |
Note: The service brakes are applied by brake oil pressure that is stored in the service brake accumulator. The brake oil pressure in the service brake accumulator is developed when the engine is running. The service brakes are released by spring pressure.
During normal operation, depress service brake control pedal (2) in order to engage the service brakes. Use the service brakes for reducing ground speed or for stopping the machine.
The pedal is fully variable. The amount of force that is applied to the brakes is proportional to the amount of force that is applied to the pedal.
Note: Repeated engagement of the service brakes on downgrades may cause excessive wear and overheating of the service brakes. Refer to Operation and Maintenance Manual, "Retarding".
The retarder can be used to reduce ground speed. The electrical retarding that is provided by the rear traction motors is more economical than the braking system because of the reduced wear to the brake discs.
During normal braking operation, use the retarder lever for speeds greater than
| NOTICE |
|---|
|
Do not use the retarder control as a parking brake or to stop the machine. |
| NOTICE |
|---|
|
Do not use the anti-rollback function as a parking brake. |
The service brakes will be automatically applied when the machine speed passes through zero and exceeds
After the anti-rollback function is engaged, the anti-rollback function must be disengaged before propeling the machine. Any of the following actions will disengage the anti-rollback function:
- Apply 90% of the service brake
- Move the shift lever into the P position
 |
|
Personal injury or death can result from a brake system malfunction. If the secondary brake is required in order to stop the machine, block the wheels securely before servicing the brake system or leaving the machine unattended. Do not operate the machine until the entire braking system has been checked and until all necessary repairs have been made. |
Note: The secondary brake system utilizes the parking brake system to apply braking force to all wheels.
In case of failure of the service brakes, depress secondary brake control pedal (1) in order to engage the secondary brake system. The amount of force that is applied to the brakes is proportional to the amount of force that is applied to the pedal.
To obtain the maximum available braking force to the machine in an emergency stop condition, apply both the service and secondary brake control pedals simultaneously.