When Engine Can Be Used; When Engine Cannot Be Used; Releasing Parking Brake - Komatsu WA470-5H Operation & Maintenance Manual

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TROUBLESHOOTING

WHEN ENGINE CAN BE USED

! If the transmission and steering wheel can be operated, and the engine is running,it is possible to tow the
machine out of mud or to move it for a short distance to the edge of the road.
! The operator should sit on the machine being towed and operate the steering in the direction that the machine
is towed.

WHEN ENGINE CANNOT BE USED

When towing a machine with the engine stopped, use the following procedure.
1. The transmission oil does not lubricate the system, so remove the front and rear drive shafts. If necessary,
block the tires to prevent the machine from moving.
2. The steering cannot be operated, so remove the steering cylinder.
Even if the brakes are in good condition, the brakes can only be used a limited number of times. There is no
change in the operating force for the brake pedal, but the braking force is reduced each time the pedal is
depressed.
3. Connect the towing equipment securely. When carrying out towing operations, use two machines of at least
the same class as the machine being towed. Connect one machine each to the front and rear of the machine
being towed, then remove the blocks from the tires and tow the machine.
4. Parking brake
The parking brake cannont be turned OFF. To release the parking brake, do as follows.

RELEASING PARKING BRAKE

! When releasing the parking brake, stop the machine on level ground and check that the surrounding
area is safe. If it is necessary to release the brake on a slope in an emergency, block the tires before
starting the operation.
! If the parking brake is released, the brake cannot be used, so check the safety carefully when moving
the machine.
If the engine will not run for some reason, use the following methods to release the parking brake and tow the
machine.
METHOD OF RELEASING PARKING BRAKE WITH EMERGENCY PARKING BRAKE RELEASE
VALVE
When the parking brake switch is at the OFF position and the emergency parking brake release valve is
opened, the parking brake is released immediately.
In this condition, even if you feel danger and try to stop the machine, the parking brake will not be applied
immediately even if you close the emergency parking brake release valve.
If the pressure in the brake accumulator is high, do as follows.
1. Turn the starting switch to the OFF position.
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WARNING
CAUTION
OPERATION
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