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| Illustration 1 | g03083176 |
Main control valve (2-Function, with ride control and optional auxiliary) schematic (1) 363-8114 Main Control Valve Gp (2-Function with Ride Control) (2) 366-8542 Bank Valve Gp (Auxiliary Third Function) (3) 370-5764 Relief Valve Gp (Margin) (4) 333-8242 Solenoid Valve Gp (Pilot on off) (5) 332-1985 Relief Valve Gp (Tilt head end) (5A) 332-1986 Relief Valve Gp (Tilt rod end) (6) 9T-1573 Check and Relief Valve Gp (Auxiliary function) (7) 224-4530 Relief Valve Gp (Ride control) (8) 373-9483 Relief Valve Gp (Ride control pressure limiting) (9) 313-7668 Solenoid Valve Gp (Dump) (9A) 313-7668 Solenoid Valve Gp (Rack) (9B) 313-7668 Solenoid Valve Gp (Lower) (9C) 313-7668 Solenoid Valve Gp (Raise) (9D) 313-7668 Solenoid Valve Gp (Auxiliary port B) (9E) 313-7668 Solenoid Valve Gp (Auxiliary port A) (10) 277-8863 Solenoid Valve Gp (Ride control activation) (11) 251-3268 Solenoid Valve Gp (Ride control charge balance) (12) 375-3789 Relief Valve Gp (Load sense) (13) 367-8969 Pressure Reducing Valve (14) 123-4750 Check Valve (Load sense boost) (15) 6E-4701 Check Valve Gp (Pilot accumulator) (16) 355-9981 Pilot Oil Accumulator Gp (17) 362-8659 Accumulator Gp (Ride control) (18) 112-1817 Manual Valve Gp (Dead engine lower) (19) 349-8844 Check Valve Gp (Backpressure implement return) (20) 368-7045 Valve Stem (Tilt) (21) 368-7044 Valve Stem (Lift) (22) 356-8561 Valve (Anti-drift poppet) (23) 356-8603 Check Valve Gp (Anti-drift Lift) (23A) 356-8603 Check Valve Gp (Anti-drift Tilt) (24) 388-4493 Check Valve Gp (Load sense lift) (24A) 388-4493 Check Valve Gp (Load sense tilt) (25) Compensator and load check valve (26) 305-4563 Shuttle Valve Gp (Load sense duplicating auxiliary) (27) 371-1784 Relief Valve Gp (Auxiliary) (28) Compensator and load check auxiliary (29) 234-4869 Makeup Valve (Lift) (30) Tilt cylinder (31) Lift cylinders (32) Breather (33) Hydraulic tank (34) Piston pump implement (A) Primary pilot supply (B) Implement ECM (C) Power Train ECM (D) Tilt lever position sensor (E) Lift lever position sensor (F) Auxiliary lever position sensor (G) Fine modulation switch (H) Kickout set switch (J) Autodig trigger switch (K) Dig mode switch (L) Operation mode switch (Autodig System) (M) Autodig kickout set switch (N) Position sensor (lift) (P) Position sensor (tilt) (R) Position sensor (auxiliary) (S) Pressure sensor (lift) | |
Note: Illustration 1 shows a machine with an auxiliary function. Machines without auxiliary functions (logging fork, side dump bucket, multipurpose bucket) will not have auxiliary cylinders. Machines without an auxiliary function will not have auxiliary section (2) on main control valve (1). Machines without ride control will not have the ride control valve.
The electrohydraulic system is composed of the following systems:
- Implement electronic control system
- Pilot hydraulic system
- Main hydraulic system
- Ride control system
- Kickout system
Hydraulic tank (33) is common to all of the systems.
The implement electronic control system is made up of the following components:
- (9-9E) solenoid valves (pilot proportioning)
- (13) pressure reducing valve
- (34) implement piston pump
- (B) implement ECM
- (D-F) control levers or joystick control
- (G-M) switches
- (N-S) sensors
ReferenceFor additional information about the implement electronic control system, refer to the Service Manual module Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.
The main hydraulic system is made up of the following components:
- (1) main control valve
- (12) load sensing signal relief valve
- (30) tilt cylinder
- (31) lift cylinders
- (34) implement piston pump
- Auxiliary cylinders if equipped
ReferenceFor additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.
The ride control system is made up of the following components:
- (17) ride control accumulator
- (31) lift cylinders
- (C) power train ECM
- Ride control valve
ReferenceFor additional information about the ride control system, refer to the Service Manual module Systems Operation, "Ride Control System" for the machine that is being serviced.
The kickout system is made up of the following components:
- (13) pressure reducing valve
- (B) implement ECM
- (D or E) control levers or joystick control
- (N) lift linkage position sensor
- (P) tilt linkage position sensor
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| Illustration 2 | g03085276 |
Right Side View of the Machine (1) Main Control Valve (17) Ride control accumulator (18) Manual valve dead engine lower (30) Tilt cylinder (31) Lift cylinders (33) Hydraulic tank (43) Piston pump implement pilot (B) Implement ECM (C) Power Train ECM (D) Tilt lever position sensor (E) Lift lever position sensor (F) Auxiliary lever position sensor (H) Kickout set switch (J) Autodig trigger switch (K) Dig mode switch (L) Operation mode switch (Autodig System) (M) Autodig kickout set switch (N) Position sensor (lift) (P) Position sensor (tilt) | |
Implement piston pump (43) is located under the cab. Pump (43) is mounted to the rear of the steering pump. The pump stack is mounted in-line to the torque converter housing.
Hydraulic tank (33) is located behind the cab.
The ride control system provides a means for dampening the bucket forces which produce a pitching motion as the machine travels over a rough terrain.
ReferenceFor additional information on the operation of the ride control system, refer to Systems Operation, "Ride Control System" for the machine that is being serviced.
Manual valve (18) for the dead engine lower is located in front of the articulation joint. The manual valve is used in order to lower the lift arms when there is an electrical failure.
Implement ECM (B) is located in the cab behind the operator seat.
Implement piston pump (43) provides pump supply oil to main control valve (1). A remote pressure tap for measuring implement pressure is located at the articulation joint on the right side.
Implement piston pump (43) also supplies pilot oil pressure to the pilot system. A pressure tap for measuring pilot pressure is located by the main control valve near the pilot oil accumulator.
Main control valve (1) is mounted on the front-end frame.
Load sensing signal relief valve (12) is mounted on the main control valve. Line relief valves (5) and (5A) are also attached to the main control valve. The main control valve controls the pump supply oil to the implement cylinders.
ReferenceFor additional information about the main control valve, refer to the Service Manual module Systems Operation, "Main Control Valve" for the machine that is being serviced.
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| Illustration 3 | g03342006 |
(T) Tilt control (U) Lift control (V) Auxiliary control | |
The tilt control lever (T), lift control lever (U), and auxiliary control lever (V) are located to the right of the operator seat.
Note: Illustration 2 shows a machine with an auxiliary function. Machines without an auxiliary function will not have auxiliary control lever (V) .
ReferenceFor information on the implement control levers, refer to Systems Operation, "Implement Electronic Control System" for the machine that is being serviced.