PULLEY GP 8N8603 - Caterpillar

Ride control valve (3) is an optional control valve. This function provides dampening for the forces that are produced by the bucket as the machine travels over rough terrain. Ride control valve (3) has three operating modes: AUTO, OFF and SERVICE. Details about the three operating modes of the ride control valve can be found in Systems Operation, "Ride Control System".Ride control valve (3) contains solenoid valve (24) which is controlled by an on/off output driver from the machine ECM. Solenoid valve (24) works with shuttle valve (19) in order to charge ride control accumulator (7). When accumulator (7) is being charged, check valve (23) allows pump oil to enter ride control valve (3) through shuttle valve (19). Oil exits the ride control valve through port (39) in order to charge ride control accumulator (7). Solenoid valve (24) also balances the ride control system prior to activation.When ride control accumulator (7) is not being charged, check valve (23) keeps oil from the circuit from returning to the main hydraulic system. If oil pressure rises above the setting of ride control relief valve (16), the relief valve opens. Excess pressure drains to the hydraulic tank through tank port (A). Ride control valve (3) also contains solenoid valves (10) and (14). When ride control is activated, solenoid valve (10) allows oil to enter the valve from the rod end of the lift cylinder at port (36). Oil exits the ride control valve at tank port (A). Solenoid valve (14) and check valve (38) allow oil from the lift cylinder head end to mix with oil from accumulator (7) at port (37). Nitrogen gas in ride control accumulator (7) acts as a shock absorber for the lift circuit.ReferenceThe operation of ride control valve (3) is explained in Systems Operation, "Ride Control System".ReferenceFor more information on the operation or the solenoid valves, refer to Systems Operation, "Implement Electronic Control System".Auxiliary Control Valve
Illustration 6 g02431216
Auxiliary Control Valve in the OPEN position (11A) 272-2334 Relief Valve (Line) Head end (11B) 272-2334 Relief Valve (Line) Rod end (15) 313-7668 Solenoid Valve (Pilot Proportioning) (20) 260-6736 Valve Stem (Auxiliary) (21) 260-8590 Shuttle Valve Load Signal Resolver (26) Compensation and Load Check Valve (40) Work port to head end of auxiliary cylinder (41) Work port to rod end of auxiliary cylinder (42) Bridge Passage (A) Tank Port (B) Pump PortAuxiliary control valve (4) is an optional control valve. The auxiliary control valve has all of the components that are in the tilt control valve minus the solenoid valve for drift reduction (10). The auxiliary valve controls auxiliary implements such as a logging fork, a side dump bucket, or a multipurpose bucket.Oil from the implement piston pump flows to the auxiliary control valve at port (B). Auxiliary valve stem (20) is controlled by solenoids (15). Auxiliary valve stem (20) is spring centered with a closed center. Auxiliary valve stem (20) has three positions: CLOSE, HOLD and OPEN.HOLD Position
Springs keep auxiliary valve stem (20) in