Mechanically Operated Machines
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| Illustration 1 | g01210872 |
The hydraulic schematic for the mechanically operated machines (1) Extendable stick cylinder (If Equipped), (2) Sideshift lock cylinders (If Equipped), (3) Pump, (4) Hydraulic tank, (5) Oil cooler, (6) Return oil filter, (7) Back pressure valve, (8) Metering pump, (9) Steering cylinder, (10) Loader tilt cylinders, (11) Loader lift cylinders, (12) Auxiliary control valve, (13) Tilt control valve, (14) Lift control valve, (15) Priority valve, (16) Joystick for the left side stabilizer, (17) Joystick for the right side stabilizer, (18) Control valve for the Sideshift lock cylinder (If Equipped), (19) End cover, (20) Extendable stick control valve (If Equipped), (21) Stick control valve, (22) Backhoe bucket control valve, (23) Swing control valve, (24) Boom control valve, (25) Auxiliary control valve (If Equipped), (26) Inlet cover, (27) Right stabilizer control valve, (28) Left stabilizer control valve, (29) The manifold for the stabilizer, (30) Left stabilizer cylinder, (31) Right stabilizer cylinder, (32) Boom cylinder, (33) Swing cylinders, (34) Backhoe bucket cylinder, (35) Stick cylinder and (36) Hydraulic lock control valve | |
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| Illustration 2 | g00850943 |
The location of components on the left side of the machine is for the backhoe loader with the parallel lift (If Equipped), and with the side shift (If Equipped). (2) Sideshift lock cylinders, (4) Hydraulic tank, (5) Cooler, (6) Filter, (8) Metering pump, (10) Auxiliary cylinder, (11) Tilt cylinders, (12) Lift cylinders, (35) Right stabilizer cylinder, (37) Swing cylinders, (38) Bucket cylinder and (39) Stick cylinder | |
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| Illustration 3 | g00850945 |
The location of components on the right side of the machine is for the backhoe loader with the parallel lift (If Equipped) and with the side shift (If Equipped). (1) Extendable stick cylinder, (3) Pump,, (9) Steering cylinder, (14) Ride control valve, (15) Ride control accumulator, (16) Auxiliary control valve, (17) Tilt control valve, (18) Lift control valve, (19) Priority valve, (22) Control valve for the sideshift lock cylinder, (24) Extendable stick control valve, (25) Stick control valve, (26) Backhoe bucket control valve, (27) The control valve for the swing cylinder, (28) Boom control valve, (29) Auxiliary control valve, (31) Right stabilizer control valve, (32) Left stabilizer control valve, (34) Left stabilizer cylinder, (36) Boom cylinder, (37) Swing cylinders and (43) Hydraulic lock control valve (if equipped) | |
The hydraulic system is a load sensing, pressure compensated, closed center system. The pump for the hydraulic system is controlled automatically. The pump is a piston type pump. The pump has a separate torque limiter that is mounted in the pump housing.
The hydraulic system provides oil for the steering and for the backhoe. The system also provides oil for the loader, for the ride control (If equipped) and for the operation of the stabilizers. The standard hydraulic system consists of the following parts: the hydraulic tank (4), variable displacement axial piston pump (3), return oil filter (6), oil cooler (5), backhoe control valves (25), (26), (27), (29), (31), and (32), loader control valves (17) and (18), metering pump for the steering (8) and various associated cylinders
The pump is located in the middle of the machine, mounted to the transmission.
The hydraulic tank (4) is located in the rear of the engine compartment in front of the cab.
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| Illustration 4 | g00753397 |
Hydraulic oil cooler location (5) Hydraulic oil cooler. | |
The hydraulic oil cooler (5) is mounted in front of the radiator at the front of the engine compartment.
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| Illustration 5 | g00758410 |
The location of the control lever for the mechanically operated loader (45) Control lever for the loader bucket, (46) Auxiliary control lever, (47) Switch for the transmission neutralizer and (48) Switch for the all wheel steer (If Equipped) | |
The loader controls are located on the right side of the operator station. The control lever for the loader bucket (45) controls the following positions of the bucket.
The control lever for the loader bucket (45) controls FLOAT, LOWER, RAISE, RETURN-TO-DIG, TILT BACK, and DUMP positions of the bucket.
This lever also has a switch (47) in order to neutralize the transmission. The lever also has a switch (48) for the all wheel steer (If equipped).
If the machine is equipped with an auxiliary valve, the auxiliary control valve (46) controls that circuit.
If equipped, the auxiliary cylinder (10) functions with auxiliary control valve (16). If equipped, the ride control valve (14) and ride control accumulator (15) works with the loader lift circuit. A machine with single tilt will be equipped with one tilt cylinder. A machine with parallel lift will be equipped with two tilt cylinders.
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| Illustration 6 | g00758409 |
The location for the control levers for the mechanically controlled backhoe | |
Note: The left side of the machine and the right side of the machine are established by the view when you are operating the controls.
With the standard hydraulic excavator control pattern, the control for the stick and swing (49) controls the STICK IN, STICK OUT, SWING LEFT and SWING RIGHT. The control for the boom and bucket (50) controls the BOOM RAISE, BOOM LOWER, BUCKET LOAD, and BUCKET DUMP.
With the optional backhoe control pattern, the control for the boom (49) controls the BOOM RAISE, BOOM LOWER, SWING LEFT and SWING RIGHT. The control for the stick (50) controls the STICK IN, STICK OUT, BUCKET LOAD, and BUCKET DUMP.
The extendable stick control pedal (51) controls the STICK EXTEND. The extendable stick control pedal (51) controls the STICK RETRACT.
The auxiliary pedal (52) controls the pressurized lines of an attachment.
The hydraulic system also provides oil for steering. The standard two-wheel steering system consists of metering pump (8) and steering cylinder (9) .
Oil is supplied by the pump (3) on machines that are equipped with all wheel steer. All wheel steer provides additional steering capability with the rear wheels.
An optional hydraulic lock control valve (36) controls the flow of hydraulic oil from the pump to the backhoe bank valve. The optional hydraulic lock control valve is located on the inlet cover (26) of the backhoe bank valve. The bank valve for the loader and the bank valve for the stabilizers are still supplied with hydraulic oil from the pump.
Note: There are different combinations of levers and pedals that are available. Refer to the Operation and Maintenance Manual for the different combinations of the levers and pedals that are available.
Pilot Operated Machines
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| Illustration 7 | g01210989 |
The hydraulic schematic for the pilot operated machines (1) Extendable stick cylinder (If Equipped), (2) Sideshift lock cylinders (If Equipped), (3) Pump, (4) Hydraulic tank, (5) Oil cooler, (6) Return oil filter, (7) Back pressure valve, (8) Metering pump, (9) Steering cylinder, (10) Auxiliary cylinder (If Equipped), (11) Loader tilt cylinders, (12) Loader lift cylinders, (13) Pressure switch for ride control (if equipped), (14) Ride control valve (if equipped), (15) Ride control accumulator (If Equipped), (16) Auxiliary control valve (If Equipped), (17) Tilt control valve, (18) Lift control valve, (19) Priority valve, (20) Joystick for the left side stabilizer, (21) Joystick for the right side stabilizer, (22) Control valve for the Sideshift lock cylinder (If Equipped), (23) End cover, (24) Extendable stick control valve (If Equipped), (25) Stick control valve, (26) Backhoe bucket control valve, (27) Swing control valve, (28) Boom control valve, (29) Auxiliary control valve, (30) Inlet cover, (31) Right stabilizer control valve, (32) Left stabilizer control valve, (33) The manifold for the stabilizer, (34) Left stabilizer cylinder, (35) Right stabilizer cylinder, (36) Boom cylinder, (37) Swing cylinders, (38) Backhoe bucket cylinder, (39) Stick cylinder, (40) Joystick for the backhoe bucket, (41) Joystick for the backhoe boom, (42) Joystick for the loader control, (43) Pilot shutoff valve and (44) Accumulator for the pilot oil | |
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| Illustration 8 | g00850943 |
The location of components on the left side of the machine is for the backhoe loader with the parallel lift (If Equipped), and with the side shift (If Equipped). (2) Sideshift lock cylinders, (4) Hydraulic tank, (5) Cooler, (6) Filter, (8) Metering pump, (10) Auxiliary cylinder, (11) Tilt cylinders, (12) Lift cylinders, (35) Right stabilizer cylinder, (37) Swing cylinders, (38) Bucket cylinder and (39) Stick cylinder | |
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| Illustration 9 | g00850945 |
The location of components on the right side of the machine is for the backhoe loader with the parallel lift (If Equipped) and with the side shift (If Equipped). (1) Extendable stick cylinder, (3) Pump,, (9) Steering cylinder, (14) Ride control valve, (15) Ride control accumulator, (16) Auxiliary control valve, (17) Tilt control valve, (18) Lift control valve, (19) Priority valve, (22) Control valve for the sideshift lock cylinder, (24) Extendable stick control valve, (25) Stick control valve, (26) Backhoe bucket control valve, (27) The control valve for the swing cylinder, (28) Boom control valve, (29) Auxiliary control valve, (31) Right stabilizer control valve, (32) Left stabilizer control valve, (34) Left stabilizer cylinder, (36) Boom cylinder, (37) Swing cylinders and (43) Pilot shutoff valve | |
The hydraulic system is a load sensing, pressure compensated, closed centered system. The pump for the hydraulic system is controlled automatically. The pump is a piston type pump. The pump has a separate torque limiter that is mounted in the pump housing.
The hydraulic system provides oil for the steering and for the backhoe. The system also provides oil for the loader, for the ride control and for the operation of the stabilizers. The standard hydraulic system consists of the following parts: hydraulic tank (4), Variable displacement axial piston pump (3), return oil filter (6), oil cooler (5), bank valves for the backhoe control (25), (26), (27), (29), (31), and (32), loader control valves (17) and (18), metering pump for the steering (8) and various associated cylinders
The bank valve controls the hydraulic lift cylinder (12) and the hydraulic tilt cylinder (11) of the bucket. If equipped, the auxiliary cylinder (10) functions with auxiliary control valve (16). Loader tilt cylinder (11) and loader lift cylinder (12) are components of the loader circuit. If equipped, the ride control valve (14) and ride control accumulator (15) works with the loader lift circuit. A machine with single tilt will be equipped with one tilt cylinder. A machine with parallel lift will be equipped with two tilt cylinders.
The pump is located in the middle of the machine, mounted to the transmission.
The hydraulic tank (4) is located in the rear of the engine compartment in front of the cab.
The backhoe control valve controls the backhoe, and the swing cylinders. The backhoe control valve also controls the stabilizer cylinders (34) and (35), stick cylinder (39), bucket cylinder (38), swing cylinders (37), and boom cylinder (36) .
The backhoe control valve controls the sideshift (If Equipped).
If equipped, with an extendable stick, the backhoe circuit also includes cylinder (1) and control valve (24) .
Machines are equipped with a pilot shutoff valve (43). The pilot shutoff valve stops the flow of pilot oil to the loader control valves and to the backhoe control valves. The stabilizer control valves are not affected by the pilot shutoff valve.
The hydraulic system also provides oil for steering. The standard two-wheel steering system consists of metering pump (8) and steering cylinder (9) .
Oil is supplied by the pump (3) on machines that are equipped with all wheel steer. All wheel steer provides additional steering capability with the rear wheels.
The metering pump (8) is located in the front of the cab. The priority valve (19), and the loader lift control valve (18) are mounted on the right side frame under the cab. The loader tilt control valve (17), and the auxiliary control valve (16) are mounted on the right side frame under the cab. Access to the bank valves is from the bottom of the machine or by removing the floorplate.
The auxiliary cylinder (10), the tilt cylinders (11), and the lift cylinders (12) are located at the front of the machine. The auxiliary cylinder is mounted on the bucket, or near the bucket. The two tilt cylinders on a machine with parallel lift are mounted on each side of the hood. The one tilt cylinder on a single tilt machine is located in front of the radiator. The tilt cylinder is centered in the loader frame. The lift cylinders are located on each side of the engine compartment near the center of the machine.
The stick cylinder (39), the bucket cylinder (38), right stabilizer cylinder (35), and swing cylinders (37) are located at the rear of the machine.
The sideshift lock cylinders (2) are located at the rear of the machine.
The left stabilizer cylinder (34) and the boom cylinder (36) are located at the rear of the machine. The boom cylinder is mounted to the backhoe. The left stabilizer cylinder is mounted on the rear frame. The left stabilizer cylinder is mounted in the frame rails of the sideshift (If Equipped).
The bank valves are located at the back of the machine. The stick control valve (25), and the bucket control valve (26) are part of the bank valves for the backhoe. The control valve for the right stabilizer (31), and the control valve for the left stabilizer (32) are part of the bank valves for the backhoe. The swing control valve (27), and the boom control valve (28) are part of the bank valves for the backhoe. The control valve for the sideshift lock cylinder (23), and the shutoff valve for the pilot system (43) are part of the bank valves. Access is gained from the bottom of the machine or by removing covers.
If the machine is equipped with an extendable stick, extendable stick cylinder (1), and the control valve for the extendable stick (24) are also part of the hydraulic system. Cylinder (1) is located at the rear of the machine, mounted in the backhoe. Control valve (24) is installed in the bank valves for the backhoe and the valves are mounted at the rear of the machine.
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| Illustration 10 | g00753397 |
Hydraulic oil cooler location (5) Hydraulic oil cooler. | |
The hydraulic oil cooler (5) is mounted in front of the radiator at the front of the engine compartment. Access to the oil cooler is gained by opening the hood and removing the side covers.
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| Illustration 11 | g00753393 |
The location of the joystick for the pilot operated loader (45) Control lever for the loader bucket (46) Auxiliary control switch (47) Switch for the transmission neutralizer (48) Switch for the all wheel steer (If Equipped) | |
The operator must face forward and the seat must face forward while you move the machine. When you operate the loader control, the operator and the seat must face forward. The loader controls are located on the right side of the operator station. The control lever for the loader bucket (45) controls the following positions of the bucket.
The control lever for the loader bucket (45) controls FLOAT, LOWER, RAISE, RETURN-TO-DIG, TILT BACK, and DUMP positions of the bucket.
This lever also has a switch (47) in order to neutralize the transmission. The lever also has switches (48) for the all wheel steer or auxiliary loader functions.
If the machine is equipped with an auxiliary valve, the auxiliary control switch (46) controls that circuit.
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| Illustration 12 | g00753395 |
The location of the joysticks for the pilot operated backhoe (49) Control for the Boom and swing, (50) Control for the Stick and bucket, (51) Control for the Extendable stick and (52) Control for the foot operated auxiliary control (if equipped) | |
The operator must rotate the seat in order to operate the backhoe. The operator faces the rear of the machine with the levers for the backhoe in sight.
Note: The left side of the machine and the right side of the machine are established by the view when you are operating the controls.
With the standard hydraulic excavator control pattern, the control for the stick and swing (49) controls the STICK IN, STICK OUT, SWING LEFT and SWING RIGHT. The control for the boom and bucket (50) controls the BOOM RAISE, BOOM LOWER, BUCKET LOAD, and BUCKET DUMP.
With the optional backhoe control pattern, the control for the boom (49) controls the BOOM RAISE, BOOM LOWER, SWING LEFT and SWING RIGHT. The control for the stick (50) controls the STICK IN, STICK OUT, BUCKET LOAD, and BUCKET DUMP.
The extendable stick control pedal (51) controls the STICK EXTEND. The extendable stick control pedal (51) controls the STICK RETRACT.
The auxiliary pedal (52) controls the pressurized lines of an attachment.
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| Illustration 13 | g00734058 |
optional switching valve | |
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| Illustration 14 | g00749555 |
(1) standard hydraulic excavator pattern (2) optional backhoe control pattern | |
The machine can be equipped with an optional switching valve that changes the pattern of the backhoe controls from the standard hydraulic excavator pattern (1) to the optional backhoe control pattern (2) .
Note: There are different combinations of levers and pedals that are available. Refer to the Operation and Maintenance Manual for the different combinations of the levers and pedals that are available.