Service Manual

Rev. A
Groundsmaster 7200/7210 Page 5 - 17 Electrical System
Parking Brake Switch (Serial Number Above 310000000)
The parking brake switch on machines with serial num-
ber above 310000000 is a normally open, powered
proximity switch. The parking brake switch is located un-
der the front panel in front of the operator seat (Fig. 19).
When the parking brake is released, a tab on the parking
brake shaft is positioned near the target end of the park-
ing brake switch so the switch is closed. The tab on the
parking brake shaft is moved away from the switch when
the parking brake is applied causing the switch to open.
The Standard Control Module (SCM) monitors the sta-
tus of the parking brake switch. If the ignition switch is
in the ON position and the parking brake is released, the
SCM Parking Brake Off input LED should be illuminated.
Testing
1. Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a SCM input (see Standard Control M odule in this
section). If the SCM verifies that t he brake switch and
circuit wiring are functioning correctly, no further brake
switch testing is necessary. If the SCM determines that
the brake switch and circuit wiring are not functioning
correctly, test switch using the following steps.
2. Remove front panel to access parking brake switch.
3. Turn ignition switch to the ON/PREHEAT position (do
not start engine) and check LED on cable end of parking
brake switch.
A. TheswitchLEDshould be illuminated when the
parking brake is not applied.
B. TheswitchLEDshould not be illuminated when
the parking brake is applied.
4. If the parking brake switch LED did not function cor-
rectly:
A. Make sure that parking brake switch is properly
adjusted (see Parking Brake Switch in the Adjust-
ments section of this chapter). If necessary, adjust
switchandreturntostep2above.
B. Make sure ignition switch is OFF a nd disconnect
the parking brake switch connector f rom the ma-
chinewireharness.
C. Using a multimeter, verify that the machine wire
harness connector terminal for black wire is closed
(continuity) to ground.
D. Turn ignition switch to the ON/PREHEAT position
(do not start engine) and verify with a multimeter that
machine wire harness connector terminal for parking
brake switch pink wire has system voltage (12 VDC)
present.
E. Turn ignition switch to the OFF position.
F. If black wire is closed to ground, pink wire has
system voltage present and switch LED did not func-
tion, r eplace parking brake switch. Adjust switch dur-
inginstallation(seeSwitchAdjustmentbelow).
5. If the parking brake switch tests correctly and a cir-
cuit problem still exists, check circuit wire harness (see
Electrical Schematic and Wire Harness Drawings in
Chapter 8 - Foldout Drawings).
6. Make sure that wire harness electrical connector is
connected to the parking brake switch.
Switch Adjustment
The distance between the parking brake switch and the
tab on the parking brake shaft should be from 0.110” to
0.150” (2.8 to 3.8 mm) when the parking brake is re-
leased. If distance is incorrect, loosen jam nuts that se-
curebrakeswitchtobracket.Positionswitchwithjam
nuts to allow correct clearance between switch and
brake shaft tab. Jam nuts should be torqued from 162 to
198in-lb(18.4to22.4N-m). After jam nuts are tight-
ened, make sure that clearance has not changed.
After adjustment to the parking brake switch, use the
Standard Control Module to verify that brake switch and
circuit wiring are functioning correctly.
1. Parking brake switch
2. Lock washer (2 used)
3. Jam nut (2 used)
4. Shaft tab
5. Brake pedal
Figure 19
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Electrical
System