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Personal injury can result if the machine moves while testing the parking brake. If the machine begins to move during the test, reduce the engine speed immediately and apply the service brakes. |
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| NOTICE |
|---|
If the machine moved while testing the parking brake, inspect the parking brake components for wear or damage. Repair or replace the worn or damaged parking brake components as required before returning the machine to service. |
Specifications
| 980H Engine Idle Speeds | ||
|---|---|---|
| Engine Idle Speeds | Standard | Actual |
| Low Idle | 800 ± 20 RPM | |
| High Idle | 2200 ± 20 RPM | |
Introduction
The following test is used to determine if the parking brake is functional. This test is intended to measure the maximum brake holding effort. The brake holding effort that is required to prevent a machine from moving at a specific engine rpm varies depending on the machine. The variations are the differences in the engine setting, in the power train efficiency, and in the brake holding ability.
This information includes the following test:
- Parking Brake - Test
Test Preparation
ReferenceTest and Adjust, "Parking Brake Actuator - Adjust"
Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
Make sure that the steering frame lock is in the STORED position. Not the Locked position.
Test the parking brake on a dry, level concrete or asphalt surface. This test should not be on any loose surface such as gravel or soil.
Fasten the seat belt before testing the parking brake.
Test Procedure
- Start the engine. Raise the bucket slightly.
- Engage the parking brake. Place the autoshift control switch in the MANUAL position. Place the transmission direction and speed control lever in the THIRD SPEED FORWARD position.
- Gradually increase the engine speed to high idle 2200 ± 20 RPM. The machine should not move.
Note: When the transmission is shifted to the THIRD SPEED FORWARD position and the parking brake is engaged, a Warning Category 3 will occur.
- Reduce the engine speed to low idle 800 ± 20 RPM. Place the transmission direction and speed control lever in the NEUTRAL position.
- Lower the bucket to the ground. Stop the engine.