Low and Reverse Brake Preinspection
Low and Reverse Brake PreinspectionBrake operation
Caution: Applying compressed air to the assembled clutch pack for longer than 3 s at a time will damage the seal. Do not apply compressed air for more than the aforementioned time when testing the system.
1. Inspect the brake operation by applying compressed air as shown.
Air pressure:
392 kPa (4.0 kgf-cm2, 57 psi) max.
2. If not as specified, replace parts as necessary.
Brake clearance
1. Measure the low and reverse brake clearance.
1) Set the dial gauge to the low and reverse brake.
2) Set the measuring point of the dial gauge to the low and reverse brake piston.
3) Apply compressed air to the part indicated in the figure and let the low and reverse brake piston stroke three times.
Air pressure:
98.1 kPa (1.0 kgf-cm2, 14 psi)
4) Apply compressed air and operate the low and reverse brake piston. Read the value when the indicator of the dial gauge stops.
5) Release the compressed air and read the dial gauge when the low and reverse brake piston is not operating.
6) Calculate the low and reverse brake clearance according to the following formula: Step (4) value - Step (5) value = low and reverse brake clearance.
7) Measure the clearances at four locations (90° apart) by following the steps from (3) to (6). Verify that the average value is within the specification below:
Low and reverse brake clearance:
2.20-2.50 mm (0.087-0.098 in)
2. If not as specified, replace parts as necessary.