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Workman HD SeriesPage 8 − 32Electrical System
Interlock Switch (1/3 Area Lift Platform Kit)
A proximity switch is attached to the frame under the
dash of units with a 1/3 area lift platform installed. The
switch is in its closed position as long as the parking
brake is released. When the parking brake is engaged,
the brake lever moves away from the switch causing the
contacts to open. The switch is used in the starting inter-
lock system to make sure that the lift platform is not in
use during engine startup.
Testing
1. Park vehicle on a level surface, shut engine off, re-
move key from ignition switch and chock wheels. Locate
the interlock switch (Fig. 47).
2. Remove knob from gear shift lever, then remove boot
plate and shifter boot from seat base (Fig. 48). Additional
access may be necessary and can be obtained by re-
moving the control plate.
3. Use a multimeter (ohms setting) to test continuity
across the switch terminals. Disconnect the wire har-
ness connector from switch. Check continuity across the
two (2) switch terminals. There should be continuity
(zero ohms) when the parking brake is released and
there should not be continuity (infinite ohms) when the
parking brake is engaged.
4. After switch testing is completed, connect the wire
harness connector(s) to the switch.
5. Secure shifter boot and boot retainer to seat base
with removed screws. Install knob on gear shift lever.
Figure 47
1. Parking brake 2. Interlock switch
1
2
1. Screw
2. Control plate
3. Boot plate
4. Shifter boot
Figure 48
1
2
3
4