Service Manual

Groundsmaster 4500--D/4700--D Page 5 -- 11 Electrical System (Rev. A)
Seat Switch
The seat switch is normally open and closes when the
operator is on the seat. If the traction system or PTO
switch is engaged when the operator raises out of the
seat, the engine will stop. The seat switch and its electri-
cal connector are located directly under the seat. Test-
ing of the switch can be done without seat removal by
disconnecting the seat wire from the machine wiring
harness.
1. Make sure the engine is off.
2. Disconnect electrical connector for the seat switch.
3. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
4. With no pressure on the seat, there should be no
continuity between the seat switch terminals.
5. Press directly onto the seat switch through the s eat
cushion. There should be continuity as the seat cushion
approaches the bottom of its travel.
6. Replace switch as needed. Reconnect switch con-
nector.
1. Electrical connector 2. Seat switch
Figure 12
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Parking Brake Switch
The switch used for the parking brake is a normally open
proximity switch. The parking brake switch is located un-
der the steering tower cover (Fig. 13) and closes when
the parking brake is released. The sensing plate for the
switch is an integral component of the parking brake rod.
Switch Testing
1. Make sure the engine is off. Locate switch for testing.
2. Disconnect electrical connector from the switch.
3. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
4. With the parking brake released, there should be
continuity across the switch terminals.
5. Apply the parking brake. There should be no continu-
ity across the switch terminals.
6. Replace switch as needed. Reconnect switch.
Switch Adjustment
1. Adjust switch to have 1/16 in (1.6 mm) clearance be-
tween switch and sensing plate on the brake rod when
the parking brake is released.
1. Parking brake switch
2. Sensing plate
3. Brake rod (brake ON)
Figure 13
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Electrical
System