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PIPE 0878432 - Caterpillar

0878432 PIPE Caterpillar parts PIPE
Alternative (cross code) number:
Caterpillar 0878432 PIPE

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Illustration 3 g03715497
Propel Hydraulic System Reverse Travel
(1) Forward solenoid
(2) Reverse solenoid
(3) Metering spool
(4) Forward multifunction valve
(5) Pressure limiter
(6) Main relief valve
(7) Makeup valve
(8) From auxiliary hydraulic system
(9) Parking brake cylinder
(10) Final drive
(11) From auxiliary hydraulic system
(12) Shift cylinder
(13) Servo piston
(14) Left propel pump
(15) To cooler bypass manifold port "A"
(16) From hydraulic tank suction return filter
(17) Charge pump
(18) Charge relief valve
(19) Reverse multifunction valve
(20) Left propel motor
(21) Flushing relief valve
(22) Flushing spool
(23) To port "E" of cooler bypass manifold
(24) Motor output shaft When the machine is traveling in reverse, reverse solenoid (2) is energized. The condition of the reverse solenoid is determined by the signal that is sent from the transmission ECM. The transmission ECM analyzes the input signals to determine the magnitude of the output signal which the ECM then sends to the reverse solenoid.Charge pressure flows across reverse solenoid (2) and acts against metering spool (3). The metering spool moves, and charge oil is metered across the spool to the reverse chamber of servo piston (13). The charge oil causes the servo piston to shift. This shift changes the angle of the swashplate in left pump (14), and the pump generates flow in the reverse circuit. While the machine is traveling in reverse, the following occurs:
Reverse multifunction valve (19) limits system pressure.
Oil from the forward circuit flows through flushing spool (22).
Makeup valve (7), in forward multifunction valve (4), allows charge oil to flow into the forward circuit.When the propel system is in the travel mode and the parking brake is off, the transmission ECM energizes the shift solenoid. Under these conditions the transmission ECM also energizes the brake solenoid. Oil from auxiliary system (8) and (11) is directed in

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