Repair manual

RD 27 Troubleshooting the Drive System
wc_tx000949gb.fm 61
4.8 Testing Drive Motor Integrity
Prerequisites  Hydraulic oil must be warm
 207 bar (3000 psi) pressure gauge
 Graduated container and tubing
Background By checking the drive motor case drain flow, the integrity of the drive motor can be
determined. Test both drive motors, one at a time, as described below.
Procedure Follow the procedure below to test the drive motor integrity.
1. Start the engine and operate the machine at high idle until the hydraulic oil tem-
perature reaches 43±5.6°C (110±10°F).
2. Position the machine facing up a 19-degree or less slope. Or, block the drums
so they do not move.
3. Stop the engine.
4. Disconnect the case drain hose (a) from the drive motor. To reduce the risk of
hydraulic system contamination, cap the case drain hose immediately after
disconnecting it. Dispose of spilled hydraulic oil in accordance with local
environmental protection policy.
5. Connect one end of the tubing to the case drain of the hydraulic motor. Connect
the other end to a graduated container (b).
6. Connect a 207 bar (3000 psi) pressure gauge to the forward port (c) of the drive
pump.
This procedure continues on the next page.