143H and 163H Motor Graders All Wheel Drive Caterpillar

Hydraulic Schematic (All Wheel Drive)

Usage:

143H APN

The hydraulic schematic for the all wheel drive system is shown in the following state:

The engine is running.
No hydraulic functions have been activated.

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Illustration 1	g01076836
(1) Right all wheel drive accumulator (2) Right all wheel drive piston motor (3) Control valve (4) Displacement solenoid (5) Drive solenoid (6) Charge solenoid (7) Check valve (8) Charge pressure sequence valve (9) Purge pressure sequence valve (10) Shuttle spool (11) Solenoid for the pump pressure (12) Flushing and cooling control valve (13) Control piston (14) Makeup and line relief valve (15) Piston pump (16) Servo valve (17) Pressure sensor (18) Pilot spool (19) Left all wheel drive accumulator (20) Left all wheel drive piston motor (21) Flow divider and combiner valve (22) Crossover relief valve (23) Drive spool (24) Charge spool (25) Proportional solenoids (26) Centershift lock (27) Solenoid valve for the centershift lock (28) Gear pump (29) All wheel drive filter (30) Oil cooler (31) Oil cooler bypass valve (A) Line to the fan drive (B) Line to the centershift control valve (C) Line from the hydraulic tank (D) Line to the case drain

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