Parking Brake Switch
Theswitchusedfortheparkingbrakeisanormally open
proximity switch that is located under the steering tower
cover (Fig. 90). The parking brake switch is an input for
theTEC--5002controller.Whentheparkingbrake isnot
applied, a tab on the brake rod is positioned near the
switch sense zone which causes the switch 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).
34
(3.9
to 42 in--lb
to 4.7 N--m)
6
1
Testing
2
3
4
1.
Before disconnecting the parking brake switch for
5
testing, the switch and its circuit wiring should be tested
as aTECcontroller inputwith theInfo Center Diagnostic
Display (see Info Center Display in this section).
2.
brake switch and circuit wiring are functioning correctly,
If the Diagnostic Display verifies that the parking
no further switch testing is necessary.
Figure 90
1.
2.
3.
Lock nut
Parking brake switch
Switch plate
4.
5.
6.
Carriage bolt
3.
brake switch and circuit wiring are not functioning cor-
If the Diagnostic Display determines that the parking
Parking brake rod
Steering tower cover
rectly, test brake switch.
Adjustment
4.
Make sure ignition switch is OFF. Remove key from
ignition switch.
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.
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.
multimeter (ohms setting) across the connector termi-
nals.
Check the continuity of the switch by connecting a
9.
away frombrake switch), there should be nocontinuity
When the parking brake is not applied (brake rod tab
(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
frontsteeringtowercover(seeSteeringTower
Assembly in the Service and Repairs section ofChapter
7
-- Chassis).
Electrical System
Page 5 -- 50
Groundsmaster 5900/5910
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