SkyTrak 8042 Service Manual - Manual (Page 840)

9.249 Model 8042, 10042, 10054 Legacy Rev. 10/03
Electrical System
c. Service Brake Switch Adjustment
Note: The service brake switch adjustment will require
two people. Enlist the help of an assistant before
attempting to follow the adjustment procedure.
1. Remove lower access panel (14).
2. Loosen locknut (9) securing the switch body (10) to
the service brake switch bracket (11).
3. Connect a 1000 psi (69 bar) pressure gauge to the
test port (15) on the service brake valve (16).
4. Block both front tires.
5. Start the engine and run it at low idle.
6. Position the boom above 40°, have the engine
running at idle, the transmission in forward 4th gear
and the park brake released.
7. Slowly depress and hold the brake pedal (17) to
maintain 150 ±50 psi (10,3 ±3,4 bar) brake
pressure.
8. Using the switch dust cover (12) and the locknut (9)
in combination, position the brake switch so the
Stabil-TRAK dash light comes ON at the 150 ±50 psi
(10,3 ±3,4 bar) brake pressure.
9. Repeat steps 6 through 8 until the Stabil-TRAK dash
light comes ON at the 150 ±50 psi (10,3 ±3,4 bar)
brake pressure.
10. After the required pressure is achieved, use a
wrench and fully tighten the locknut (9) against the
service brake switch bracket (11).
In order to test the switch for proper operation, the boom
must be raised above the 40° position, the parking brake
switch must be in the OFF position and the vehicle must
be in a forward or reverse gear mode. Proper operation
of the switch will activate the Stabil-TRAK dash panel
indicator. If the Stabil-TRAK indicator does not activate
when all conditions are met, the sensor must be adjusted.
(Refer to Section 9.14.17, b. “Boom Angle Sensor
Installation.”)
11. Shut off the engine.
12. Remove blocking from front tires.
13. Remove the pressure gauge.
14. Replace lower access panel (14).
WARNING:
NEVER attempt to adjust
the service brake switch without an assistant.
Anytime the engine is running and the parking
brake is disengaged, there must be an
operator located in the cab and the two front
tires must be blocked. Death or serious
personal injury could result from the vehicle
lurching forward or backward and running over
the person attempting to adjust the service
brake switch.
OH1760
14
MA7060
15
16
17