Repair manual

RD 27 Troubleshooting the Drive System
wc_tx000949gb.fm 53
4.2 Determining Where to Begin
Prerequisites  Engine must be able to start
 Multimeter
Procedure Follow the procedure below to determine where to begin and the sequence of
checking the drive system.
1. Disconnect the seat switch solenoid (a).
2. With the engine running, measure the voltage between wire 307-OR-16 and
ground.
f If 10–12.5 VDC is not measured, the problem is within the electrical compo-
nents. Follow the sequence below to troubleshoot the electrical components of
the drive system.
f If 10–12.5 VDC is measured, the problem is within the hydraulic components.
Follow the sequence below to troubleshoot the hydraulic components of the
drive system.
Step Task See Topic
1. Check the brake switch. 3.9
2. Check the interlock relay. 4.3
3. Check the seat switch. 4.4
Step Task See Topic
1. Check the seat switch solenoid valve. 4.5
2. Check the neutral brake solenoid valve. 4.6
3. Check the pressure of the drive system. 4.7
4. Check the drive motor case drain flow. 4.8