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Groundsmaster 5900/5910Page 5 -- 50Electrical System
Parking Brake Switch
The switch used for the parkingbrake is a normallyopen
proximity switch that is located under the steering tower
cover ( Fig. 90). The parking brake switch is an input for
the TEC--5002controller.When theparking brake isnot
applied, a tab on the brake rod is positioned near the
switch sense zone which causes the s witch to close.
When the parking brake is applied, the brake rod tab is
positioned away from the switch allowing the switch to
be in its normal, open position (no continuity).
Testing
1. Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC controller inputwith the Info Center Diagnostic
Display (see Info Center Display in this section).
2. If the Diagnostic Display verifies that the parking
brake switch and circuit wiring are functioning correctly,
no further switch testing is necessary.
3. If the Diagnostic Display determines that the parking
brake switch and circuit w iring are not functioning cor-
rectly, test brake switch.
4. Make sure ignition switch is OFF. Remove key from
ignition switch.
5. Remove front steering tower cover (see Steering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis).
6. Locate parking brake switch and unplug wire har-
ness connector from switch.
7. Disconnect switch electrical connector from the ma-
chine wire harness.
8. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
9. When the parking brake is not applied (brake rod tab
away from brake switch), there shouldbe no continuity
(infinite resistance) between the switch terminals.
10.When the parking brake is applied (brake rod tab
close to brake switch), there should be continuity (zero
resistance) between the switch terminals.
11.Replace switch if necessary.
12.Correctly connect the wire harness connector to the
parking brake switch after testing is completed.
13.Install front steering tower cover (see Steering Tower
Assembly inthe Service and Repairs section of Chapter
7 -- Chassis).
1. Lock nut
2. Parking brake switch
3. Switch plate
4. Carriage bolt
5. Parking brake rod
6. Steering tower cover
Figure 90
1
3
2
4
5
6
34 to 42 in--lb
(3.9 to 4.7 N--m)
Adjustment
With the parking brake not applied (brake rod tab near
the switch), there should be a 0.062” (1.6 mm) gap be-
tween the switch and the brake rod tab.