Repair manual

RD 27 Troubleshooting the Drive System
wc_tx000949gb.fm 63
4.9 Testing the Parking Brakes
Prerequisites Hydraulic oil must be warm
Background The brakes on this machine are spring-activated and hydraulically released. By
removing the hydraulic supply hose from the brakes, the spring and mechanical
portion of the brakes may be tested.
Procedure Follow the procedure below to test the parking brakes.
1. Start the engine and operate the machine at high idle until the hydraulic oil
temperature reaches 43±5.6°C (110±10°F).
2. Position the machine on a smooth, horizontal surface.
3. Stop the engine.
4. Disconnect the brake oil supply hose (a) from each motor. To reduce the risk of
hydraulic system contamination, cap the hoses and motor fittings immediately
after disconnecting them.
5. Start the engine.
6. Move the parking brake switch to the OFF position.
7. Slowly move the FWD/REV control lever fully forward. Then, move it fully
backward.
Do the brakes keep the machine from moving?
8. Stop the engine.
9. Remove the caps from hydraulic hoses and fittings. Reconnect the hydraulic
hoses to the motors.
Result The parking brakes have now been checked.
Yes ____ No ____
The brakes are OK. The brakes portion of the hydraulic motor is
in need of repair.