Caterpillar 72H Pipelayer Brake Release Guide

This illustration show you guide on how to release brake for Caterpillar 72H Pipelayer.

Caterpillar Diagnostic Tool

Procedures:
1. Turn bypass valve handle (5) to the closed position.


 

2. Initially, rapidly move the pump handle. This will produce a large volume of oil flow.
3. The brake piston seal must be fully seated. The seating of the seal is evident by a sudden rise in the oil pressure.
When the seal is properly seated, the pressure rises to the relief valve setting. The setting is 3030  70 kPa (440 10 psi).CAT SIS 2021
4. Now, the machine can be towed.

NOTICE
Do not allow pressure to drop below 2756 kPa (400 psi) while towing.
Partial brake engagement could occur and can result in brake damage.
Brakes must be fully released when towed machine is moving.
Open bypass valve (5) in order to apply the brakes.
This will completely dump the oil.
The brake system can only be applied by turning the bypass valve. The service brake pedal and the steering levers do not function.
After towing, remove the brake release pump.CAT ET
Repair the machine. Install the floorplate and the seat.





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