OPERATION TROUBLESHOOTING
3-115
WHEN ENGINE DOES NOT START 3
WARNING
q If action has been taken to release the brakes, the brakes cannot be used, so never let anyone travel
on the machine when it is being towed.
q When towing a machine downhill, connect another machine behind the machine being towed and use
the brakes on this machine to control the braking.
q When carrying out the towing operation, do not let any person enter the area around the machine
being towed.
If the engine does not work and the machine is to be moved, it is necessary to carry out preparatory work to install
a pump to release the brakes.
For details of the equipment needed to tow a machine when the engine does not work, please contact your
Komatsu distributor.
To release the brakes, install a brake release pump on the machine to be towed and connect the hose at the pres-
sure side of the pump to the brake valve. Use the pressure of the pump to apply pressure to the brake valve and
release the brake. For details, see the next page. Follow the procedure and carry out the operation correctly.
CONNECTING BRAKE RELEASE PUMP
It is possible to use a service hydraulic pump to release the brakes on the problem machine and tow it.
q Part number of hydraulic pump: 790-190-1500
Main specifications of hydraulic pump
Discharge amount: 25 cc/stroke
Discharge pressure: 60 kg/cm2 (5.88 MPa)
Tank capacity: 20 liters
Oil used: SAE10W
Weight: 9.5 kg
Hose length: 1.5 m
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