950G Wheel Loader
• Electro-Hydraulic Implement System
• Command Control Steering System
STEERING SYSTEM COMPONENTS
STEERING HYDRAULIC TANK STEERING SHAFT
CONTROL VALVE PILOT SYSTEM
MAIN SYSTEM
NEUTRALIZER SECONDARY SYSTEM
STEERING VALVES
PUMP COMMON TO
PILOT VALVE ALL SYSTEMS
PILOT/BRAKE STEERING SECONDARY STEERING SECONDARY
PUMP CYLINDER PUMP AND MOTOR STEERING VALVE
PUMP AND COMPENSATOR OPERATION
ENGINE OFF
SIGNAL PASSAGE PUMP OUTPUT
LARGE YOKE
ACTUATOR PAD
SWASHPLATE
DRIVE
SHAFT
FLOW COMPENSATOR PRESSURE
(MARGIN) SPOOL COMPENSATOR SMALL ACTUATOR
(CUTOFF) SPOOL AND BIAS SPRING
PISTON AND
BARREL ASSEMBLY
PUMP AND COMPENSATOR OPERATION
LOW PRESSURE STANDBY
SIGNAL PASSAGE PUMP OUTPUT
LARGE ACTUATOR YOKE PAD
SWASHPLATE
DRIVE
SHAFT
FLOW COMPENSATOR PRESSURE
(MARGIN) SPOOL COMPENSATOR
(CUTOFF) SPOOL
SMALL ACTUATOR PISTON AND
AND BIAS SPRING BARREL ASSEMBLY
PUMP AND COMPENSATOR OPERATION
UPSTROKING
SIGNAL PUMP OUTPUT
REDUCED PRESSURE LARGE ACTUATOR YOKE PAD
SWASHPLATE
DRIVE
SHAFT
FLOW COMPENSATOR PRESSURE
(MARGIN) SPOOL COMPENSATOR SMALL ACTUATOR
(CUTOFF) SPOOL AND BIAS SPRING
PISTON AND
BARREL ASSEMBLY
PUMP AND COMPENSATOR OPERATION
DESTROKING
SIGNAL PUMP OUTPUT
LARGE ACTUATOR YOKE PAD
SWASHPLATE
DRIVE
SHAFT
FLOW COMPENSATOR PRESSURE
(MARGIN) SPOOL COMPENSATOR
(CUTOFF) SPOOL PISTON AND
BARREL ASSEMBLY
SMALL ACTUATOR
AND BIAS SPRING
PUMP AND COMPENSATOR OPERATION
HIGH PRESSURE STALL
SIGNAL AT PUMP OUTPUT
MAX. PRESSURE AT MAX. PRESSURE
LARGE ACTUATOR YOKE PAD
SWASHPLATE
DRIVE
SHAFT
FLOW COMPENSATOR PRESSURE
(MARGIN) SPOOL COMPENSATOR SMALL ACTUATOR
(CUTOFF) SPOOL AND BIAS SPRING
PISTON AND
BARREL ASSEMBLY
STEERING TO STEERING
CONTROL VALVE
A
PILOT VALVE
HOLD
TO STEERING PILOT OIL PORTS
WHEEL
DIRECTIONAL
INPUT SHAFT CONTROL VALVE
A TO STEERING
CONTROL VALVE
CAM
PLUNGER
REGULATING
SPRING FROM IMPLEMENT
PILOT SUPPLY
PRESSURE
REGULATING
VALVE
ADJUSTMENT SCREW
SECTION A-A
STEERING
STEERING PILOT VALVE A CONTROL VALVE
HOLD PASSAGE
TO STEERING PILOT OIL PORTS
WHEEL
INPUT SHAFT DIRECTIONAL
CONTROL VALVE
A STEERING
CONTROL VALVE
STEERING CONTROL STEERING PILOT CAM PASSAGE
VALVE PASSAGES VALVE BODY
PLUNGER
DRAIN
PASSAGE REGULATING
SPRING FROM IMPLEMENT
(3) PILOT SUPPLY
FROM
PILOT PRESSURE
REGULATING
VALVE
DIRECTIONAL
CONTROL ADJUSTMENT SCREW
VALVE
SECTION A-A
STEERING PILOT VALVE FROM STEERING
RIGHT TURN A CONTROL VALVE
TO STEERING PILOT OIL PORTS
WHEEL
DIRECTIONAL
FROM STEERING INPUT SHAFT CONTROL VALVE
CONTROL
VALVE
A TO STEERING
CONTROL VALVE
TO
TANK CAM
PLUNGER
TO FROM
TANK PILOT
REGULATING
SPRING
FROM PUMP
TO TANK PRESSURE
TO STEERING REGULATING
CONTROL VALVE VALVE
ADJUSTMENT SCREW
SECTION A-A
STEERING
STEERING PILOT VALVE A CONTROL VALVE
RIGHT TURN PASSAGE
TO STEERING PILOT OIL PORTS
WHEEL
DIRECTIONAL
INPUT SHAFT CONTROL VALVE
A STEERING
CONTROL VALVE
CAM PASSAGE
1 2 PLUNGER
REGULATING
SECTION A-A SPRING
FROM PUMP
PRESSURE
REGULATING
VALVE
ADJUSTMENT SCREW
SECTION A-A
STEERING HYDRAULIC SYSTEM
FROM PILOT
IMPLEMENT CONTROL
PILOT SUPPLY VALVE
DOUBLE DOUBLE
CHECK CHECK
VALVE SHUTTLE VALVE
VALVE
NEUTRALIZER
VALVE
STEERING PUMP
CONTROL
VALVE
NEUTRALIZER
VALVE
STEERING
CYLINDERS
STEERING HYDRAULIC SYSTEM
FROM HOLD FROM STEERING
IMPLEMENT IMPLEMENT CYLINDERS
CIRCUIT CIRCUIT
CYLINDER CROSSOVER
PUMP STEERING PRESSURE RELIEF VALVE
GROUP PILOT VALVE REGULATING
SHUTTLE
VALVE
VALVE
TO
IMPLEMENT
CIRCUIT QUAD MAKEUP BALL
CHECK CHECK VALVES
VALVE
TO
IMPLEMENT NEUTRALIZER
PILOT CIRCUIT VALVES
DIRECTIONAL
SPOOL
PRESSURE
REDUCING
VALVE
PUMP
SECONDARY STEERING BACK-UP
PUMP AND MOTOR RELIEF
SHUTTLE VALVE
VALVE
FROM
STEERING CONTROL
IMPLEMENT
VALVE
PILOT CIRCUIT
SECONDARY STEERING
DIVERTER VALVE
STEERING HYDRAULIC SYSTEM
FROM GRADUAL RIGHT TURN FROM STEERING
IMPLEMENT IMPLEMENT CYLINDERS
CIRCUIT CIRCUIT
CYLINDER CROSSOVER
PUMP RELIEF VALVE
STEERING DIRECTIONAL PRESSURE
GROUP PILOT VALVE CONTROL REGULATING SHUTTLE
VALVES VALVE VALVE
TO
IMPLEMENT
CIRCUIT QUAD MAKEUP BALL
CHECK CHECK VALVES
VALVE
TO ORIFICE
IMPLEMENT NEUTRALIZER
PILOT CIRCUIT VALVES
DIRECTIONAL
SPOOL
PRESSURE
REDUCING
VALVE
PUMP
SECONDARY STEERING BACK-UP
PUMP AND MOTOR RELIEF
SHUTTLE VALVE
VALVE
FROM
STEERING CONTROL
IMPLEMENT
VALVE
PILOT CIRCUIT
SECONDARY STEERING
DIVERTER VALVE
STEERING HYDRAULIC SYSTEM
FROM FULL RIGHT TURN FROM STEERING
IMPLEMENT IMPLEMENT CYLINDERS
CIRCUIT CIRCUIT
CYLINDER CROSSOVER
PRESSURE
PUMP RELIEF VALVE
STEERING REGULATING
GROUP PILOT VALVE VALVE SHUTTLE
VALVE
TO
IMPLEMENT
CIRCUIT QUAD MAKEUP BALL
CHECK CHECK VALVES
VALVE
TO ORIFICE
IMPLEMENT NEUTRALIZER
PILOT CIRCUIT VALVES
DIRECTIONAL
SPOOL
PRESSURE
REDUCING
VALVE
PUMP
SECONDARY STEERING BACK-UP
PUMP AND MOTOR RELIEF
SHUTTLE VALVE
VALVE
FROM
STEERING CONTROL
IMPLEMENT
VALVE
PILOT CIRCUIT
SECONDARY STEERING
DIVERTER VALVE
STEERING HYDRAULIC SYSTEM
ENGINE OFF / SECONDARY STEERING / HOLD
FROM FROM STEERING
IMPLEMENT IMPLEMENT CYLINDERS
CIRCUIT CIRCUIT
CYLINDER CROSSOVER
PUMP PRESSURE RELIEF VALVE
STEERING REGULATING
GROUP SHUTTLE
PILOT VALVE VALVE
VALVE
TO
IMPLEMENT
CIRCUIT QUAD MAKEUP BALL
CHECK CHECK VALVES
VALVE
TO
IMPLEMENT NEUTRALIZER
PILOT CIRCUIT VALVES
DIRECTIONAL
SPOOL
PRESSURE
REDUCING
VALVE
PUMP
SECONDARY STEERING BACK-UP
PUMP AND MOTOR RELIEF
SHUTTLE VALVE
VALVE
FROM STEERING CONTROL
IMPLEMENT VALVE
PILOT CIRCUIT
SECONDARY STEERING
DIVERTER VALVE
