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| Illustration 1 | g00908731 |
928G Schematic (1) Pressure Reducing Valve (2) Pilot Oil Accumulator (3) Optional Auxiliary Cylinders (4) Tilt Cylinder (5) Lift Cylinders (6) Ride Control Solenoid Valve (7) Optional Ride Control Accumulators (8) Line to Steering System (9) Main Control Valve (10) Main Relief Valve (11) Manifold (12) The Valve for Dead Engine Lower (13) Optional Auxiliary Control Valve (14) Tilt Control Valve (15) Lift Control Valve (16) Vane Pump (Implement) (17) Piston Pump (Steering and Pilot) (18) Return Line from Metering Pump (Steering) (19) Shut Off Valve (20) Hydraulic Tank Breather (21) Hydraulic Oil Tank and Strainers (22) Auxiliary Pilot Control Valve (23) Tilt Pilot Control Valve (24) Lift Pilot Control Valve (28) Hydraulic Filter (29) Fan (30) Brake Valve (31) Optional Auxiliary Control Valve (32) Optional Auxiliary Pilot Control Valve (33) Pilot Lockout Solenoid | |
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| Illustration 2 | g00908851 |
IT28G Schematic (1) Pressure Reducing Valve (2) Pilot Oil Accumulator (3) Optional Auxiliary Cylinders (4) Tilt Cylinder (5) Lift Cylinders (6) Ride Control Solenoid Valve (7) Optional Ride Control Accumulators (8) Line to Steering System (9) Main Control Valve (10) Main Relief Valve (11) Manifold (12) The Valve for Dead Engine Lower (13) Optional Auxiliary Control Valve (14) Tilt Control Valve (15) Lift Control Valve (16) Vane Pump (Implement) (17) Piston Pump (Steering and Pilot) (18) Return Line from Metering Pump (Steering) (19) Shutoff Valve (20) Hydraulic Tank Breather (21) Hydraulic Oil Tank and Strainers (22) Optional Auxiliary Pilot Control Valve (23) Tilt Pilot Control Valve (24) Lift Pilot Control Valve (25) Fourth Function control (26) Coupler Cylinder (27) Coupler Control Valve (28) Hydraulic Filter (29) Fan (30) Brake Valve (31) Steering Metering pump (32) Optional Auxiliary Control Valve (33) Optional Auxiliary Pilot Control Valve (34) Pilot Lockout Solenoid | |
The 928G Wheel Loader and the IT28G Integrated Toolcarrier hydraulic system is made up of three systems: Implement Hydraulic System, Brake And Fan Drive System and Steering System.
All three systems share a common hydraulic tank. The hydraulic tank is vented.
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| Illustration 3 | g00901985 |
The location for the hydraulic tank is behind the cab.
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| Illustration 4 | g00903063 |
The location for the sight glass for the hydraulic oil is on the right side of the machine. The sight glass is between the cab and the hydraulic tank.
Implement Hydraulic System
The Implement hydraulic system is composed of the following components: (7) Accumulator for the ride control, (6) Ride control solenoid valve, (4) Tilt cylinders, (5) Lift cylinders, (9) Main control valve, (2) Accumulator for pilot oil, (1) Pressure reducing valve, (11) Manifold, (16) Vane pump, (21) Hydraulic tank, (10) Main Relief Valve, (14) and (15) Main Control Valves, (23) and (24) Pilot Control Valves, Line Relief Valves, Check Valves, Hydraulic Lines and (33) Pilot Lockout Solenoid.
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| Illustration 5 | g00902003 |
Left side of the machine (3) Auxiliary Cylinders (4) Tilt Cylinders (5) Lift Cylinders (12) The Valve for Dead Engine Lower (16) Vane Pump (21) Hydraulic Tank | |
Access to the piston pump (17) is achieved by removing panels under the platform. The lift cylinders (5) are mounted under the lift arms in the front frame. The ride control solenoid valve ( 6) is mounted in the center of the machine.
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| Illustration 6 | g00902480 |
Right side of the machine (1) Pressure Reducing Valve (2) Pilot Accumulator (6) Ride Control Solenoid (9) Main Control Valve (10) Main Relief Valve (11) Manifold (19) Implement Lockout (23, 24) Pilot Valves | |
Access to the accumulator (2) is achieved by removing the access panels under the platform. Access to the main control valve (9) is achieved by removing an access panel. Access to the pressure reducing valve (1) is achieved by removing the access panels under the platform. The manifold (11) is mounted in the center of the machine on the piston pump.
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| Illustration 7 | g00924944 |
Control Levers (33) Pilot lockout (14) (15) Tilt and Lift lever (22) Auxiliary for the third function valve (32) Auxiliary for the fourth function control | |
The Implement hydraulic system features control valves that are pilot operated. The control valves are closed center valves. The system is load sensing with a variable displacement pump.
The Implement hydraulic system is load sensing and the system has pressure compensation. The control valves are parallel to each other.
The system only consumes horsepower for the engine as the system requirements are needed.
Brake and Fan Drive System
The brake and fan drive system circulates the oil to the cooler in order to cool the oil in the hydraulic system. Also, the brake and fan drive system provides supply oil to the brake system.
For more information about the specifications for the brake and fan drive system, refer to Service Manual module, "Hydraulic System Specifications" for the machine.
For more information about the brake and fan drive system, refer to Service Manual module, "Brake and Fan Drive System, Systems Operation Testing and Adjusting" for the machine.
Steering System
The steering system steers the machine by changing the angle of the articulation of the machine.
For more information about the specifications for the steering systems, refer to Service Manual module, "Hydraulic System Specifications" for the machine.
For more information about the steering system, refer to Service Manual module, "Steering System, Systems Operation Testing and Adjusting" for the machine.