Service Manual

Groundsmaster 3500 Page 6 − 11 Electrical System
Check Operation of Interlock Switches
CAUTION
The interlock switches are for the operator’s
protection; do not disconnect them. Check the
operation of the interlock switches daily for
proper operation. Replace any malfunctioning
switches before operating the machine.
The machine is equipped with a number of interlock
switches. The engine will not start, or if the engine is run-
ning, the engine will stop if one or more of the interlock
conditions are met.
To start the engine:
 The PTO switch must be in the DISENGAGE posi-
tion.
 The traction pedal must be in neutral (with pedal and
switch properly adjusted)
 An operator must be in the seat or the parking brake
must be engaged.
When the engine is running, the engine should stop in
1−3 seconds if:
 The operator leaves the seat without engaging the
parking brake.
 The traction pedal is depressed with the parking
brake engaged.
Use the Standard Control Module (SCM) to check oper-
ation of the interlocks.
1. Remove the cover over the instrument panel to ex-
pose the Standard Control Module (SCM) (Fig. 8).
2. Turn the ignition switch to the on RUN position
1. Standard Control Module
Figure 8
1
3. Sit in the operators seat and the In Seat LED on the
SCM should be on. Remove your weight from the seat
and the In Seat LED on the SCM should be off.
4. The Parking Brake LED on the SCM should be on
when the parking is disengaged and go off when the
parking brake is engaged.
5. The PTO LED on the SCM should be off when the
PTO switch is in the DISENGAGED position and go on
when the PTO switch is in the ENGAGED position.
6. The Neutral LED on the SCM should be on when the
traction pedal in in the neutral position and off when the
traction pedal in the forward or reverse position.
7. Take corrective action immediately if any of the inter-
locks do not perform as described.
Electrical
System