OPERATION TROUBLESHOOTING
3-137
RELEASING BRAKE
CAUTION
When a machine is towed, the brakes must be fully released. If the brakes are partially applied, this may
lead to overheating and damage to the brakes.
To release the brakes, set the pump pressure to 2.7 to 3.1 MPa (28 to 32 kg/cm2, 398 to 454 PSI).
If the pump pressure exceeds 3.1 MPa (32 kg/cm2, 454 PSI), the components of the brake may be dam-
aged.
When towing, leakage from the oil pressure circuit will cause the pump pressure to go down with time.
Always keep the pump pressure above 1.8 MPa (18 kg/cm2, 213 PSI) when towing. If the pressure goes
below 1.8 MPa (18 kg/cm2, 213 PSI) during the towing
operation, stop the operation, pump the handle of the brake release pump, and raise the pump pressure to
2.7 to 3.1 MPa (28 to 32 kg/cm2, 398 to 454 PSI).
When towing, do not use the brakes to control the travel speed of the machine. This will further damage
the brakes and there may be defective operation of the brake system.
1. Operate handle (1) of the brake release pump and send
pressure oil to the brake circuit until it reaches the specified
pressure.
Specified pump pressure: 2.75 to 3.14 MPa (28.0 to 32.0
kg/cm2, 398 to 454 PSI)
REMARK
If it is necessary to move the brake release pump during the
operation, hold lever (2) under handle (1) and move the pump.
2. It is now possible to tow the machine.
Remove the blocks, and tow the machine at a speed of
less than 2 km/h (1.2 MPH).
OPERATING BRAKE
After completion of the towing operation, apply the brake to prevent the machine from moving.
To apply the brake, turn relief handle (1) of the brake release
pump to release the pressure.
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