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| Illustration 1 | g01442435 |
Schematic of the Implement Hydraulic System (1) Main control valve (Dozer control) (2) Pilot valves (Implement controls) (3) Relief poppet valve (4) Solenoid valve (Implement lockout) (5) Pressure tap (Relief of lift circuit) (6) Pressure tap (Relief of tilt circuit) (7) Pressure tap (Fan pump discharge) (8) Dual tilt control valve (9) Dual tilt solenoid valve (10) Left tilt cylinder (11) Right tilt cylinder (12) Left lift cylinder (13) Right lift cylinder (14) Makeup valve (15) Fan motor (16) Solenoid valve (Hydraulic fan) (17) Pressure sensor (Discharge from the pump) (18) High pressure screen (if equipped) (19) Oil cooler bypass valve (20) High pressure screen (if equipped) (21) Shuttle valve (22) High pressure screen (if equipped) (23) Pressure sensor (Discharge for implement pump) (24) Implement pump (25) Oil cooler (26) Pressure switch (Fan pump and motor return filter bypass) (27) Oil filter (Fan pump and motor oil return) (28) Breaker relief valve (29) Oil filter (Implement pump case drain) (30) Pressure switch (Implement pump case drain filter bypass) (31) Check valve (Air purge implement) (32) Manual valve (Lowering lift arm) (33) Check valve (Tilt) (34) Relief poppet valve (35) Check valve (Lift) (36) Shuttle valve (37) Relief valve (Implement pilot oil pressure) (38) Pressure tap (Pilot pressure) (39) Oil filter (Pilot system) (40) Pressure switch (Implement pilot oil filter bypass) (41) Pilot pump (implement) (42) Fluid sampling valve (43) Temperature sensor (Implement oil) (44) Hydraulic oil tank (45) Low level warning switch (46) Pressure switch (Fan pump and motor case drain filter bypass) (47) Oil filter (Fan pump and motor case drain) (48) Air purge valve (Fan pump case drain) (49) Fan pump (50) Pressure tap (Signal pressure of fan pump) | |
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| Illustration 2 | g01443207 |
Right Side View of the Machine (1) Main control valve (Dozer control) (2) Pilot valves (Implement controls) (4) Solenoid valve (Implement lockout) (5) Pressure tap (Relief of lift circuit) (6) Pressure tap (Relief of tilt circuit) (7) Pressure tap (Fan pump discharge) (8) Dual tilt control valve (10) Left tilt cylinder (11) Right tilt cylinder (12) Left lift cylinder (13) Right lift cylinder (14) Makeup valve (15) Fan motor (16) Solenoid valve (Hydraulic fan) (17) Pressure sensor (Discharge from the pump) (18) High pressure screen (if equipped) (19) Oil cooler bypass valve (20) High pressure screen (if equipped) (22) High pressure screen (if equipped) (23) Pressure sensor (Discharge for implement pump) (24) Implement pump (25) Oil cooler (27) Oil filter (Fan pump and motor oil return) (28) Breaker relief valve (29) Oil filter (Implement pump case drain) (31) Check valve (Air purge for implement) (32) Manual valve (Lowering lift arm) (37) Relief valve (Implement pilot oil pressure) (38) Pressure tap (Pilot pressure) (39) Oil filter (Pilot system) (41) Pilot pump (implement) (43) Temperature sensor (Implement oil) (44) Hydraulic oil tank (45) Low level warning switch (47) Oil filter (Fan pump and motor case drain) (49) Fan pump (50) Pressure tap (Signal pressure of fan pump) (51) Bulldozer trunnion (52) Push arm (53) Stabilizer link (54) Control handle (Implement) | |
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| Illustration 3 | g01444288 |
(54) Control handle (Implements) | |
The implement hydraulic system can be divided into three basic systems. The three different systems are the pilot system, the main hydraulic system, and the hydraulic fan system. Hydraulic oil tank (44) is common to all three systems.
Pilot control valve (2) is located in the cab beneath the implement control handle (54).
Main control valve (1) and dual tilt control valve (8) are located in the middle of the front of the non-engine end frame.
Tilt cylinders (10) and (11) are horizontal and attached to push arm (52) .
Lift cylinders (12) and (13) are attached vertically to the front of the non-engine end frame.
Pressure sensor (23) for the discharge for the implement pump is mounted above the torque converter housing.
Manual valve (32) which is located near the hitch lowers the lift cylinders in case of loss to hydraulics.
Check valve (31) for the air purge is located at the discharge port of the implement pump (large section).
Relief valve (37) for implement pilot oil pressure is located behind the cab on the right side of the engine end frame.
Fan motor (15) is located on the back side of the radiator.
Makeup valve (14) is located near the fan motor.
Solenoid valve (16) for the hydraulic fan is located on the back firewall of the pump compartment.
Filter (39) for the pilot system is located just beneath the cab on the right side of the engine end frame.
Implement pump (24) has a large pump section and a small pump section. Implement pump (24) is located behind the cab under the operator's platform. The pump is attached to the front of the right side of the torque converter housing.
Breaker relief valve (28) is located on the top side of the right hydraulic oil tank (44) .
Cooler bypass valve (19) is located near the fan motor.
Oil cooler (25) is located in front of the radiator.
High pressure screens (18) and (20) are located on the back of the radiator near the fan motor (if equipped).
Pilot pump (41) for the implements is located on the front and in the center of the torque converter housing.
Hydraulic oil tank (44) is located beneath the operator platform on the right side of the cab.
Fan pump (49) is located on the back of the right side of the torque converter housing.
Control handle (54) for the implements is on the right side of the operator seat in the cab.
Bulldozer trunnion (51) allows the blade to pivot upward. The trunnion also allows the blade to pivot downward.
Push arm (52) acts as a brace to keep the blade in position.
Case drain filters (29) and (47) are located in the pump compartment near the implement pump.
Stabilizer link (53) stabilizes the blade when the blade is in the TILT LEFT or when the blade is in the TILT RIGHT position.
Pressure taps (5), (6), and (7) are on the diagnostic plate that is located under the platform behind the cab.
Pressure tap (38) is located on the manifold for relief valve (37) .
Pressure tap (50) is located on the manifold for solenoid valve (16) .
The lift function and the tilt function on this machine are controlled with a pilot system.
Pilot System
The pilot system controls the movement of the lift and tilt valve spools in main control valve (1) .
The pilot system consists of the following components: pilot control valve (2), pilot pump (41), hydraulic oil tank (44), and control lever (54) .
ReferenceFor additional information about the pilot system, refer to the Service Manual module System Operation, "Pilot Hydraulic System" for the machine that is being serviced.
Main Hydraulic System
The main hydraulic system supplies the force that is necessary to move the blade.
The main hydraulic system consists of the following components: main control valve (1), dual tilt control valve (8), tilt cylinders (10) and (11), lift cylinders (12) and (13), implement pump (24), and hydraulic oil tank (44) .
ReferenceFor additional information about the main hydraulic system, refer to the Service Manual module System Operation, "Main Hydraulic System" for the machine that is being serviced.
Hydraulic Fan System
The hydraulic fan system cools the oil that is in the hydraulic system.
The hydraulic fan system consists of the following components: fan motor (15), makeup valve (14), solenoid valve (16), cooler bypass valve (19), oil cooler (25), screens (20) and (18) (if equipped), hydraulic oil tank (44), and fan pump (49) .
ReferenceFor additional information about the hydraulic fan system, refer to the Service Manual module System Operation, "Hydraulic Fan System" for the machine that is being serviced.