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TRANSMISSION HYDRAULIC SYSTEM NEUTRAL
Torque Converter
Main Relief Valve
Torque Converter Outlet Relief Valve
Cooler To Transmission Bearing Lubrication
Power Train ECM
Modulating Valve
Modulating Valve
Torque Converter Inlet Relief Valve
1 REVERSE
1
Modulating Valve
Modulating Valve Filter
SECOND SPEED
2
6
3
FIRST SPEED
FOURTH SPEED
3 Tank
5 Modulating Valve
Modulating Valve
Screen Group Magnet
4
5
2 FORWARD
Transmission Pump
4 THIRD SPEED
6
TRANSMISSION HYDRAULIC SYSTEM FIRST SPEED FORWARD
Torque Converter
Main Relief Valve
Torque Converter Outlet Relief Valve
Cooler To Transmission Bearing Lubrication
Power Train ECM
Modulating Valve
Modulating Valve
Torque Converter Inlet Relief Valve
4
1 REVERSE
1 Modulating Valve Filter
Modulating Valve
2
2
6
3
FIRST SPEED
FOURTH SPEED
3 Tank
5 Modulating Valve
Modulating Valve Screen Group Magnet
4
5 SECOND SPEED
FORWARD
Transmission Pump
THIRD SPEED
6
TRANSMISSION HYDRAULIC SYSTEM SECOND SPEED FORWARD
Torque Converter
Main Relief Valve
Torque Converter Outlet Relief Valve
Cooler
Power Train ECM
To Transmission Bearing Lubrication
Modulating Valve
Modulating Valve
Torque Converter Inlet Relief Valve
4
1 REVERSE
1
Modulating Valve
Modulating Valve Filter
2
SECOND SPEED
2
66
3
FIRST SPEED
FOURTH SPEED
3 Tank
5 Modulating Valve
Modulating Valve Screen Group Magnet
4
5
FORWARD
Transmission Pump
THIRD SPEED
6
TRANSMISSION HYDRAULIC SYSTEM SECOND SPEED REVERSE
Torque Converter
Main Relief Valve
Torque Converter Outlet Relief Valve
Cooler
Power Train ECM
Modulating Valve
Torque Converter Inlet Relief Valve
Modulating Valve
1
4
REVERSE
1
Modulating Valve
Modulating Valve Filter
SECOND SPEED
2
66
3
FIRST SPEED
FOURTH SPEED
3 Tank
5 Modulating Valve
Modulating Valve Screen Group Magnet
4
5
2 FORWARD
Transmission Pump
THIRD SPEED
6
To Transmission Bearing Lubrication
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM HOLD
Inlet Manifold
Ride Control Accumulator
Tilt Cylinder Lift Cylinders
Head End Solenoid valve
Tilt Antidrift Valve
Manual Lower Valve
Auxiliary Function
Line Relief Valves
Tilt Back Pilot Solenoid Valve Lift Spool
Rod End Solenoid Valve
Pressure Compensat or Valve
Auxiliary Spool Balance Valve
Pressure Compensator Valve
Screen
Resolver Valve
Resolver Valve
Resolver Valve
Check Valve
Pressure Compensator Valve
Pilot Pressure Reducing Valve
Steering Pilot Supply (CCS Only)
Signal Relief Valve Lower / Float Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Choke Check Valve
Min Angle Tank
Pilot Accumulator
Auxiliary Head End Solenoid Valve
Ride Control Relief Valve
Tilt Spool
Case Drain Filter
Hydraulic Lockout Valve
Lift Ant idrift Valve Raise Pilot Solenoid Valve
Signal Duplication Valve
Cover Manifold
Pump and Pump Cont rol Valve
Ride Control Auxiliary Rod End Solenoid Valve
Margin (Pressure differential)Relief Valve
"H" SERIES MEDIUM WHEEL LOADER TILT CONTROL VALVE HOLD
To Signal Duplication Valve
From Signal Duplication Valve To / From Head End of Cylinder
From Resolver Valves To / From Rod End of Cylinder Pressure Compensat or Valve
Tilt Antidrift Valve
Bridge Passage Line Relief and Makeup Valve
Line Relief and Makeup Valve
Internal Passage Control Spool
Feeder Passage
Rackback Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Supply Passage
"H" SERIES MEDIUM WHEEL LOADER TILT CONTROL VALVE DUMP
To Signal Duplication Valve
From Signal Duplication Valve From Head End of Cylinder
From Resolver Network To Rod End of Cylinder
Tilt Antidrift Valve
Pressure Compensat or Valve Bridge Passage
Line Relief and Makeup Valve
Line Relief and Makeup Valve
Internal Passage Control Spool
Feeder Passage
Tilt Back Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Supply Passage
PRESSURE COMPENSATOR AND LOAD CHECK VALVE HOLD
To Signal Duplication Valve
From Signal Duplication Valve From Head End of Cylinder
From Resolver Network To Rod End of Cylinder
Load Check Spool Pressure Compensator Valve
Tilt Antidrift Valve
Bridge Passage Line Relief and Makeup Valve
Line Relief and Makeup Valve
Internal Passage
Feeder Passage
Control Spool
Dump Pilot Solenoid Valve
Tilt Back Pilot Solenoid Valve
Supply Passage
PRESSURE COMPENSATOR AND LOAD CHECK VALVE LOAD CHECK OPERATION
To Signal Duplication Valve
From Signal Duplication Valve From Head End of Cylinder
From Resolver Network To Rod End of Cylinder
Tilt Antidrift Valve
Load Check Spool Pressure Compensator Valve Bridge Passage
Line Relief and Makeup Valve
Line Relief and Makeup Valve
Internal Passage Control Spool
Feeder Passage
Tilt Back Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Supply Passage
PRESSURE COMPENSATOR AND LOAD CHECK VALVE PRESSURE COMPENSATOR OPERATION From Signal Duplication Valve From Head End of Cylinder
To Signal Duplication Valve From Resolver Network
To Rod End of Cylinder
Tilt Anti-drift Valve
Load Check Spool Pressure Compensator Valve Orifices Bridge Passage
Line Relief and Makeup Valve
Line Relief and Makeup Valve
Internal Passage Control Spool
Feeder Passage
Tilt Back Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Supply Passage
PROPORTIONAL PRIORITY, PRESSURE COMPENSATOR OPERATION
From Signal Duplication Valve
Signal
To Pump and Signal Limiter To Signal Duplication Valve
Bridged Passage
Resolver Valve
Resolver Valve
Valve A
Pump Supply
HOLD
Pressure Differential Relief Valve
Valve B
Spool Bridged Passage Feeder Passage
Pump Supply
Valve C
Spool Bridged Feeder Passage Passage
LOW PRESSURE
Spool Pump Supply
Feeder Passage
HIGH PRESSURE
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM DUMP
Inlet Manifold
Lift Cylinders Tilt Antidrift Valve
Manual Lower Valve
Ride Control Accumulator
Tilt Cylinder
Lift Ant idrift Valve
Tilt Back Pilot Solenoid Valve Lift Spool
Pilot Accumulator Rod End Solenoid Valve
Pressure Compensator Valve
Ride Control Relief Valve
Pressure Compensator Valve
Screen
Resolver Valve
Resolver Valve
Check Valve
Balance Valve
Pilot Pressure Reducing Valve
Resolver Valve
Signal Relief Valve Lower / Float Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Choke Check Valve
Min Angle Tank
Auxiliary Head End Solenoid Valve
Auxiliary Spool
Tilt Spool
Case Drain Filter
Cover Manifold Hydraulic Lockout solenoid Valve
Head End Solenoid Valve
Line Relief Valves
Raise Pilot Solenoid Valve
Signal Duplication Valve
Auxiliary Function
Pump and Pump Control Valve
Ride Control Auxiliary Rod End Solenoid Valve
Margin Relief Valve
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM RAISE
Inlet Manifold
Ride Control Accumulator
Tilt Cylinder Lift Cylinders
Head End Solenoid Valve
Tilt Antidrift Valve
Manual Lower Valve
Line Relief Valves
Tilt Back Pilot Solenoid Valve Lift Spool
Rod End Solenoid Valve
Pressure Compensator Valve
Ride Control Relief Valve
Pressure Compensator Valve Resolver Valve
Signal Relief Valve
Auxiliary Spool
Check Valve
Balance Valve
Pilot Pressure Reducing Valve
Resolver Valve
Ride Control Lower / Float Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Choke Check Valve
Min Angle Tank
Auxiliary Head End Solenoid Valve
Balance Solenoid Valve
Resolver Valve
Case Drain Filter
Hydraulic Lockout Valve Pilot Accumulator
Tilt Spool
Screen
Cover Manifold
Lift Antidrift Valve Raise Pilot Solenoid Valve
Signal Duplication Valve
Auxiliary Function
Pump and Pump Control Valve
Auxiliary Rod End Solenoid Valve
Margin Relief Valve
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM FLOAT
Inlet Manifold
Lift Cylinders
Line Relief Valves
Tilt Back Pilot Solenoid Valve Lift Spool
Rod End Solenoid Valve
Pressure Compensator Valve
Auxiliary Head End Solenoid Valve
Pressure Compensator Valve Resolver Valve
Check Valve
Balance Valve
Pilot Pressure Reducing Valve
Resolver Valve
Signal Relief Valve
Lower / Float Pilot Solenoid Valve
Dump Pilot Solenoid Valve
Choke Check Valve
Min Angle Tank
Pilot Accumulator
Auxiliary Spool
Resolver Valve
Case Drain Filter
Hydraulic Lockout Valve
Ride Control Relief Valve
Tilt Spool
Screen
Cover Manifold
Lift Antidrift Valve Raise Pilot Solenoid Valve
Signal Duplication Valve
Auxiliary Function
Head End Solenoid valve
Tilt Antidrift Valve
Manual Lower Valve
Ride Control Accumulator
Tilt Cylinder
Pump and Pump Control Valve
Ride Control Auxiliary Rod End Solenoid Valve
Margin Relief Valve
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM TILT BACK AND RAISE
Inlet Manifold
Lift Cylinders Tilt Antidrift Valve
Manual Lower Valve
Ride Control Accumulator
Tilt Cylinder
Lift Ant idrift Valve
Tilt Back Pilot Solenoid Valve Lift Spool
Pilot Accumulator Auxiliary Head End Solenoid Valve
Pressure Compensat or Valve
Ride Control Relief Valve
Tilt Spool
Auxiliary Spool Pressure Compensator Valve
Screen
Resolver Valve
Lower / Float Pilot Solenoid Valve
Choke Check Valve
Pump Tank
Resolver Valve
Check Valve
Balance Valve
Pilot Pressure Reducing Valve
Resolver Valve
Signal Relief Valve
Dump Pilot Solenoid Valve
Case Drain Filter
Cover Manifold Hydraulic Lockout Valve
Line Relief Valves
Raise Pilot Solenoid Valve
Signal Duplication Valve
Auxiliary Function
Ride Control Auxiliary Rod End Solenoid Valve
Margin Relief Valve
"H" SERIES MEDIUM WHEEL LOADER IMPLEMENT HYDRAULIC SYSTEM HOLD / AUTO TRAVEL MORE THAN 9.7 KM/H (6 MPH)
Inlet Manifold
Lift Cylinders
Auxiliary Function
Head End Solenoid Valve
Tilt Antidrift Valve
Manual Lower Valve
Ride Control Accumulator
Tilt Cylinder
Line Relief Valves
Pilot Shutoff Valve
Lift Antidrift Valve
Pilot Accumulator Rod End Solenoid Valve
Raise Pilot Solenoid Valve
Tilt Back Pilot Solenoid Valve Lift Spool
Pressure Compensator valve
Auxiliary Head End Solenoid Valve
Ride Control Relief Valve
Tilt Spool
Auxiliary Spool Pressure Compensator Valve
Screen Resolver Valve
Signal Duplication Valve
Signal Relief Valve Lower / Float Pilot Solenoid Valve
Choke Check Valve
Pump Tank
Check Valve
Balance Valve
Resolver Valve
Ride Control Dump Pilot Solenoid Valve
Case Drain Filter
Resolver Valve
Pilot Pressure Reducing Valve
Auxiliary Rod End Solenoid Valve
Margin Relief Valve
STEERING SYSTEM BLOCK DIAGRAM HOLD
Hand Metering Unit Neutralizer Valve Check Valve Steering Pump
Neutralizer Valve
Secondary Steering Diverter Valve Steering Control Valve
Tank
Secondary Steering Pump and Motor (Optional)
Steering Cylinders
STEERING SYSTEM HOLD
Right Neutralizer Valve
Left Neutralizer Valve
Selector Spool
Crossover Relief Valve
Steering Pump Secondary Steering Diverter Valve Orifices
Hand Metering Unit
Secondary Steering Pump and Motor
Flow Control Orifice Mechanical Linkage
Back-up Relief Valve
Directional Spool
STEERING SYSTEM
Steering Cylinders
GRADUAL LEFT TURN
Right Neutralizer Valve
Left Neutralizer Valve
Selector Spool
Crossover Relief Valve
Steering Pump Secondary Steering Diverter Valve Orifices
Hand Metering Unit
Secondary Steering Pump and Motor
Flow Control Orifice Mechanical Linkage
Back-up Relief Valve
Directional Spool
STEERING SYSTEM FULL LEFT TURN (STEERING NEUTRALIZED)
Right Neutralizer Valve
Left Neutralizer Valve
Selector Spool
Steering Cylinders
Crossover Relief Valve
Steering Pump Secondary Steering Diverter Valve Orifices
Hand Metering Unit
Secondary Steering Pump and Motor
Flow Control Orifice Mechanical Linkage
Back-up Relief Valve
Directional Spool
STEERING SYSTEM GRADUAL LEFT TURN / SECONDARY STEERING
Right Neutralizer Valve
Left Neutralizer Valve
Selector Spool
Steering Cylinders
Crossover Relief Valve
Steering Pump Secondary Steering Diverter Valve Orifices
Hand Metering Unit
Secondary Steering Pump and Motor
Flow Control Orifice Mechanical Linkage
Back-up Relief Valve
Directional Spool
COMMAND CONTROL STEERING HYDRAULIC SYSTEM
From Implement Control Valve
Pilot Control Valve Quad Check Valve
Shuttle Valve
Neutralizer Valve Neutralizer Valve Steering Control Valve
Steering Pump
Screened Orifice Manifold
Steering Cylinders
STEERING PILOT VALVE NO TURN
A
To Steering Control Valve To Steering Control Valve
To Steering Control Valve
Pilot Oil Ports
Input Shaft Connected to Steering Wheel
Directional Control Valve
A Cam
To Steering Control Valve Plunger
Regulating Spring From Implement Control Valve Body Piston Directional Control Valve
Section A-A
Pressure Regulating Valve Adjustment Screw
To Hydraulic Tank
From Implement Control Valve
STEERING PILOT VALVE RIGHT TURN A
To Steering Control Valve To Steering Control Valve
To Steering Control Valve
Pilot Oil Ports
Input Shaft Connect ed t o St eering Wheel
A Cam Orifice Regulating Spring
Body Piston
Directional Control Valve To Steering Control Valve Plunger
From Implement Control Valve Pressure Regulating Valve Adjustment Screw
Directional Control Valve
Section A-A
To Hydraulic Tank
From Implement Control Valve
STEERING HYDRAULIC SYSTEM (CCS) HOLD
Pump Group To Implement Circuit
Steering Cylinders
From Implement Circuit
From Implement Circuit
Cylinder Crossover Relief Valve
Steering Pilot Valve
Shuttle Valve
From Resolver Network
Makeup Ball Check Valves
Screened Orifice Manifold Quad Check Valve
Directional Spool
Neutralizer Valves Pressure Reducing Valve Secondary Steering Pump and Motor
Back-up Relief Valve
Shuttle Valve
M
Steering Control Valve
Secondary Steering Diverter Valve From Implement Control Valve
STEERING HYDRAULIC SYSTEM LEFT TURN
Pump Group To Implement Circuit
Steering Cylinders
From Implement Circuit
From Implement Circuit
Cylinder Crossover Relief Valve
Steering Pilot Valve
From Resolver Network
Steering Control Valve
Shuttle Valve
Makeup Ball Check Valves
Screened Orifice Manifold Quad Check Valve
Directional Spool
Neutralizer Valves Pressure Reducing Valve Secondary Steering Pump and Motor
Shuttle Valve
M
Secondary Steering Diverter Valve From Implement Control Valve
Pump Back-up Relief Valve
BRAKE AND HYDRAULIC FAN HYDRAULIC SYSTEM ACCUMULATORS CUT IN REDUCED FAN SPEED
Left Brake Pedal
Right Brake Pedal
Rear Service Brakes
Parking Brake Valve
Parking Brake Pressure Switch
Parking Brake Actuator
Hydraulic Fan Motor
Relief Valve
Inverse Shuttle Valve Brake Pressure Switch
Fan Solenoid Valve
Cut In Valve
Resolver Valve
Screen Priority Valve
Brake and Hydraulic Fan Pump
Cut Out Valve
Pump Control Valve
Check Valve
Oil Cooler
Filter
Rear Brake Accumulator Accumulator Charging Valve and Fan Solenoid Valve
Service Brake Valve
Front Service Brakes
Parking Brake
Front Brake Accumulator
Flow Control Spool Pressure Cutoff Spool
Actuator Min Angle
Case Drain Filter
Hydraulic Tank
BRAKE AND HYDRAULIC FAN HYDRAULIC SYSTEM MINIMUM FAN SPEED AT CUT OUT
Left Brake Pedal
Right Brake Pedal
Rear Service Brakes
Parking Brake Valve
Parking Brake Pressure Switch
Parking Brake Actuator
Hydraulic Fan Motor
Rear Brake Accumulator Accumulator Charging Valve and Fan Solenoid Valve
Service Brake Valve
Front Service Brakes
Parking Brake
Front Brake Accumulator
Relief Valve
Inverse Shuttle Valve Brake Pressure Switch
Fan Solenoid Valve
Cut In Valve Cut Out Valve
Resolver Valve
Pump Control Valve
Check Valve Screen Priority Valve
Oil Cooler
Flow Control Spool Pressure Cutoff Spool
Actuator Filter
Brake and Hydraulic Fan Pump
Min Angle
Case Drain Filter
Hydraulic Tank
BRAKE AND HYDRAULIC FAN HYDRAULIC SYSTEM MAXIMUM FAN SPEED AT CUT OUT
Left Brake Pedal
Right Brake Pedal
Rear Service Brakes
Parking Brake Valve
Parking Brake Actuator
Hydraulic Fan Motor Parking Brake
Relief Valve
Inverse Shuttle Valve Brake Pressure Switch
Fan Solenoid Valve
Cut In Valve
Resolver Valve
Screen Priority Valve
Brake and Hydraulic Fan Pump
Cut Out Valve
Pump Control Valve
Check Valve
Oil Cooler
Filter
Rear Brake Accumulator Accumulator Charging Valve and Fan Solenoid Valve
Service Brake Valve
Front Service Brakes
Parking Brake Pressure Switch
Front Brake Accumulator
Flow Control Spool Pressure Cutoff Spool Actuator Min Angle
Case Drain Filter
Hydraulic Tank
Front Brake Accumulator To Power Train ECM
Left Brake Pedal
Rear Brake Accumulator
BRAKE SYSTEM
PARKING BRAKE RELEASED
Right Brake Pedal Brake Lights
Rear Axle Brakes
Hydraulic Fan Motor
Service Brake Valve
Accumulator Charging Valve
Brake Pressure Switch
Brake Pressure Switch
Front Axle Brakes
Parking Brake Valve
Parking Brake Actuator
Brake and Hydraulic Fan Pump Parking Brake Tank
Front Brake Accumulator To Power Train ECM
Left Brake Pedal
Rear Brake Accumulator
BRAKE SYSTEM
PARKING BRAKE RELEASED SERVICE BRAKES APPLIED
Right Brake Pedal Brake Lights
Rear Axle Brakes
Accumulator Charging Valve
Hydraulic Fan Motor
Service Brake Valve
Brake Pressure Switch
Brake Pressure Switch
Front Axle Brakes
Parking Brake Valve
Parking Brake Actuator
Brake and Hydraulic Fan Pump Parking Brake Tank
SERVICE BRAKE VALVE NOT ACTIVATED
Boot Plunger Return Spring Ball Retainer
Plunger Springs Shims
Ball Upper Spool Front Brake Port
System Pressure Port Lower Spool Rear Brake Port
System Pressure Port
Check Valve
Tank Port
Upper Spool Orifice Upper Spool Passage Tank Port
Lower Spool Orifice Lower Spool Passage
Lower Return Spring
SERVICE BRAKE VALVE BRAKES ACTIVATED
Boot Plunger Return Spring Ball Retainer Ball
Plunger Springs Shims Check Valve
Upper Spool Front Brake Port
System Pressure Port Lower Spool Rear Brake Port
Tank Port
Upper Spool Orifice Upper Spool Passage Tank Port
System Pressure Port Lower Spool Orifice Lower Spool Passage Lower Return Spring