ACCUMULATOR & MTG GP-RIDE CONT 1622298 - Caterpillar

Illustration 1 g01046950
Parking brake circuitThe components of the parking brake circuit are the parking brake switch, the transmission oil pressure sensor, the parking brake solenoids, the Power Train Electronic Control Module (Power Train ECM), the Caterpillar Monitoring System ECM, the parking brake oil pressure switch, and the brake accumulator oil pressure switch for brake application.
Illustration 2 g00986814
Dash panel (1) Parking brake switch
Illustration 3 g00992524
Rear view of transmission (2) Transmission oil pressure sensor
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View of transmission bay (3) Parking brake solenoid #1 (4) Parking brake solenoid #2
Illustration 5 g01047308
Cab (5) Power Train ECMWith the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker #9 to the Power Train ECM and via circuit breaker #1 to the Caterpillar Monitoring System ECM, and the transmission oil pressure sensor.
Illustration 6 g01047302
Dash panel (6) Caterpillar Monitoring System ECM (behind display) (7) Parking brake alert indicator
Illustration 7 g01047303
View of transmission bay (8) Brake accumulator oil pressure switch for brake application
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View below parking brake solenoid control valve block (9) Parking brake oil pressure switchWhen parking brake switch (1) is moved to the ON position, 24 volt power from Power Train ECM (5) to parking brake solenoids (3) and (4) will be interrupted. The pressure oil in the wheel brakes is returned to the hydraulic tank and the parking brake is engaged. In this condition, parking brake oil pressure switch (9) sends a signal to the Power Train ECM. The Power Train ECM sends a signal via the CAT Data Link to Caterpillar Monitoring System ECM (6). The Caterpillar Monitoring System ECM turns on parking brake alert indicator (7) .When the key start switch is in the ON position and the parking brake switch is in the OFF position, the parking brake switch must be cycled to allow the parking brake to be disengaged.When the oil pressure decreases in the brake system, brake accumulator oil pressure switch for brake application (8) will activate. The brake accumulator oil pressure switch then sends a signal to the Power Train ECM to engage the parking brake.When the oil pressure in the transmission decreases below a set value, transmission oil pressure sensor (2) sends a signal to the Power Train ECM. The Power Train ECM illuminates the low transmission oil pressure indicator and engages the parking brake.When the parking brake switch is moved to the OFF position, power from the Power Train ECM is supplied to activate the parking brake solenoids. This will allow pressure oil to flow to the wheel brakes to disengage the parking brake. The parking brake alert indicator will be off.