OM3012.3 Operation - Section 3 Instrument Panel and Controls Page 3-25 (49) and (52) Brake ON (55) Circuit Breaker This 30 amp circuit breaker protects the heater blower motor and the air conditioning system from overloads. The circuit breaker can be reset manually by pushing the red reset button. When the Parking Brake switch (50) or Brake Lock switch (53) is in this position, the brake is ON. (50) Parking Brake Switch Promptly report to maintenance personnel any burnt out fuses or circuit breakers that need re- peated resetting. These may be indications of se- rious problems that may result in fire or damage to components if neglected.
To apply parking brake, press right side of switch to "On" position (49). To release, press left side of switch to the "Off" position (51). When the parking brake is actuated, an indica- tor light (33) will be illuminated on the instrument panel. (56) Circuit Breaker The parking brake is spring-applied and hydraulically released. The parking brake can be applied only when the keyswitch is in the "Run" position and the transmis- sion range selector is in the NEUTRAL position. It will not apply if truck speed is above 0.5 mph (0.8 kph). This 15 amp circuit breaker protects the steering bleed- down timer from overloads.
If a malfunction in the circuitry occurs, the breaker will open the circuit. The circuit breaker can be reset manually by pushing the red reset button. The parking brake is automatically applied when the engine is shut-down and hydraulic pressure is bled down (keyswitch "Off"). (57) Circuit Breaker This 5 amp circuit breaker protects the warning cluster and the sound alarm from overloads. If a malfunction occurs, the breaker will open to protect the circuit from overcurrent condition. The circuit breaker can be reset manually by pushing the red reset button. (51) and (54) Brake OFF When the Parking Brake switch (50) or Brake Lock switch (53) is in this position, the brake is OFF.
(58) Turn Signal Fuse Holder This is a 15 amp.- dual element, time delay (slow blow) type fuse. Replacement with any other type is not recom- mended. (53) Brake Lock Switch The Brake Lock Switch actuates the hydraulic oil disc brakes on the rear of the truck. Apply the brake lock switch only when truck is dumping or being loaded. Do not use for parking ! When pulling into the shovel or dump area, do not apply the brake lock switch until truck is completely stopped . (59) Windshield Wiper Fuse Holder This is a 15 amp.- dual element, time delay (slow blow) type fuse. Replacement with any other type is not recommended. To apply the brake lock, press right side of switch to "On" position (52).
To release, press left side of switch to the "Off" position (54). When the brake lock is actuated, an indicator light (31) will be illuminated on the instrument panel.