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, theengine 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
2
1.
2.
3.
multimeter (ohms setting) across the connector termi-
nals.
Make sure the engine is off.
Disconnect electrical connector for the seat switch.
Check the continuity of the switch by connecting a
Figure 12
2.
1.
Electrical connector
Seat switch
4.
continuity between the seat switch terminals.
With no pressure on the seat, there should be no
5.
cushion. There should be continuity as the seat cushion
approaches the bottom of its travel.
Press directly onto the seat switch through the seat
6.
Replace switch as needed. Reconnect switch con-
nector.
Parking Brake Switch
Theswitchusedfortheparkingbrakeisanormally open
proximityswitch.Theparkingbrakeswitchislocatedun-
der the steering tower cover (Fig. 13) and closes when
the parking brake is released. The sensing plate for the
switchisanintegralcomponentoftheparkingbrakerod.
3
2
Switch Testing
1
1.
2.
3.
multimeter (ohms setting) across the connector termi-
nals.
Makesuretheengineisoff.Locateswitchfortesting.
Disconnect electrical connector from the switch.
Check the continuity of the switch by connecting a
Figure 13
4.
continuity across the switch terminals.
With the parking brake released, there should be
1.
2.
Parking brake switch
Sensing plate
3. Brake rod (brake ON)
5.
Applytheparkingbrake.Thereshouldbenocontinu-
ity across the switch terminals.
6.
Replace switch as needed. Reconnect switch.
Switch Adjustment
Adjust switch to have 1/16 in (1.6 mm) clearance be-
1.
tween switch and sensing plate on the brake rod when
the parking brake is released.
Groundsmaster 4500--D/4700--D
Page 5 -- 11
Electrical System (Rev. A)
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| Document Type | Service Manual |
| Language | English |
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