manual-caterpillar-928g-it28g-wheel-loaders-implements-system-hydraulic-control-valves-kickout-positioner.pdf

Service Training MALAGA

928 G & IT 28 G

VI. IMPLEMENT SYSTEM 1.Hydraulic System 2.Control Valves 3.Kickout Positioner Sara APRIL 1997

Page:

928G IMPLEMENT HYDRAULIC SYSTEM HOLD

VI-1

DEAD ENGINE LOWER

PRESSURE REDUCING VALVE TO STEERING MAIN RELIEF VALVE FROM STEERING

PILOT SHUTOFF VALVE PILOT VALVE

TILT VALVE

LIFT VALVE

928 G & IT 28 G

AUX. VALVE

CHAPTER : Implement System

MANIFOLD

Page: VI-2

IT28G IMPLEMENT HYDRAULIC SYSTEM HOLD TO AUX FUNCTION

TO AUX FUNCTION

RIDE CONTROL

DEAD ENGINE LOWER

TO FOURTH FUNCTION

PRESSURE REDUCING VALVE TO STEERING MAIN RELIEF VALVE

MANIFOLD

PILOT SHUTOFF VALVE PILOT VALVE

COUPLER VALVE

TILT VALVE

LIFT VALVE

928 G & IT 28 G

AUX. VALVE

CHAPTER : Implement System

FROM STEERING

928 G & IT 28 G CHAPTER : Implement System

CONTROL VALVE

AUXILIARY OR COUPLER CONTROL VALVE HOLD PORT A

PILOT PASSAGE

LINE RELIEF AND MAKEUP VALVE

INLET

PORT B

BRIDGE PASSAGE

MAIN CONTROL SPOOL

OUTLET

SERIES FEEDER PASSAGE

CHECK VALVE

AUXILIARY OR COUPLER CONTROL VALVE SHIFT PILOT PASSAGE

BRIDGE PASSAGE Page:

VI-3

PORT A

INLET

PORT B

OUTLET CHECK VALVE

Page: VI-4

928G TILT CONTROL VALVE HOLD PORT A

PILOT PASSAGE

SERIES FEEDER PASSAGE

OUTLET CHECK VALVE

MAIN CONTROL SPOOL

928 G & IT 28 G

BRIDGE PASSAGE

PORT B

CHAPTER : Implement System

LINE RELIEF AND MAKEUP VALVE

INLET

Page: VI-5

IT28G TILT CONTROL VALVE REGENERATIVE POSITION

PILOT PASSAGE

INLET

OUTLET

LAND

928 G & IT 28 G

CHECK VALVE

PORT B

CHAPTER : Implement System

BRIDGE PASSAGE

PORT A

928 G & IT 28 G CHAPTER : Implement System

LIFT CONTROL VALVE

LIFT CONTROL VALVE HOLD PORT A

INLET

PORT B

MAKEUP VALVE OUTLET

LIFT CONTROL VALVE FLOAT PORT A

PILOT PASSAGE

BRIDGE PASSAGE Page:

VI-6

INLET

PORT B

OUTLET CHECK VALVE

MAKEUP VALVE

928 G & IT 28 G CHAPTER : Implement System

KICKOUT POSITIONER WHEEL LOADER BUCKET/IMPLEMENT POSITIONER AND LIFT KICKOUT ELECTRICAL CIRCUIT

GN

F776-WH

LIFT KICKOUT 128-PK A

B

C

SWITCH

10 A

LIFT ARM MAGNET POS NEG

POS NEG

TILT CYLINDER MAGNET SWITCH 761-GY

LIFT SOLENOID

A BC F776-WH

TILT SOLENOID

963-GN

TILT KICKOUT

762-YL

INTEGRATED TOOLCARRIER BUCKET/IMPLEMENT POSITIONER AND LIFT KICKOUT ELECTRICAL CIRCUIT

GN

F776-WH

LIFT KICKOUT 128-PK A

B

C

SWITCH

10 A

LIFT ARM MAGNET POS NEG

POS NEG

FORK POSITION SWITCH

TILT CYLINDER MAGNET BUCKET POSITION SWITCH

LIFT SOLENOID

A BC

A BC

761-GY F776-WH

TILT SOLENOID 963-GN

964-BU

TILT KICKOUT 762-YL

CONTROL SWITCH

Page:

VI-7