(Oto-Hui - Com) Caterpillar 966H Wheel Loader HYDRAULIC SYSTEM [PDF]

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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