HOSE AS 9R9221 - Caterpillar

Illustration 2 g01149839
Pilot Manifold (2) Pilot manifold (3) Pressure tap (swing brake pressure) (4) Flow control valve (medium pressure)Gear pump (1) supplies oil to the pilot system, the brake system, the steering system, and the auxiliary tool system. The main pump provides flow for the implements and travel circuits. Flow from the pilot system is used to operate different functions on the M300C Series machines. The major functions of the pilot system are listed below:
Activate all hydraulic control valves.
Release the swing parking brake.
Activate the oscillating axle cylinders.
Control engagement of the transmission clutches.
Operate the creeper speed.
Change gears.
Generate power shift pressure for the main hydraulic pump.
Illustration 3 g01149841
Pilot Manifold (5) Pilot pressure relief valve (6) Medium pressure solenoid valves (7) Medium pressure reducing valve (8) Primary relief valve (9) Transmission shift solenoid valve (10) Hydraulic lockout solenoid valve (11) Travel lockout solenoid valve (12) Swing brake release solenoid valve (13) Creeper speed solenoid valve (14) Oscillating axle lock solenoid valve (15) Swing pump pilot signal limiter (16) Main pump PRV (17) Pilot accumulator (18) Flow control valve (medium pressure (check valve))
Illustration 4 g01146783
(5) Pilot pressure relief valve (9) Transmission shift solenoid valve (10) Hydraulic lockout solenoid valve (11) Travel lockout solenoid valve (12) Swing brake release solenoid valve (13) Creeper speed solenoid valve (14) Oscillating axle lock solenoid valve (15) Swing pump pilot signal limiter (16) Main pump PRV (17) Pilot accumulatorThe pilot control system for the M300C series machines is similar to the former machines. Flow for the pilot system comes from pump (1). The pilot circuit has a separate filter, pilot accumulators (17), and