Repair manual

RD 27 Troubleshooting the Drive System
wc_tx000949gb.fm 57
4.4 Checking the Seat Switch
Prerequisites  Machine shut down
 An assistant
Background There are two seat switches. If one fails, the other will allow machine operation.
The procedure to check either seat switch is the same.
Procedure Follow the procedure below to check the seat switch.
1. Check that the wiring to each seat switch is secure. If it is not, reconnect the
wiring and retry drive system operation. If the wiring is secure, continue.
2. Disconnect the wires from the seat switch (a).
.
3. Check the seat switch for continuity across its two terminals. (The seat switch is
a normally open (NO) switch.)
Is there continuity between the two terminals?
4. Have an assistant sit in the operator’s seat.
5. Recheck the seat switch for continuity across its two terminals.
Is there continuity between the two terminals?
The seat switch has now been checked. Reconnect the wiring.
If the problem has not been resolved, continue with the next topic.
Yes ____ No ____
The seat switch has failed; replace it. Continue.
Yes ____ No ____
The seat switch is OK. The seat switch has failed; replace it.