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| Illustration 1 | g01134084 |
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Hydraulic schematic for the steering system (1) Steering cylinder (2) Steering cylinder (3) Implement and steering solenoid valve (4) Portable hydraulic pump quick connect coupler (5) Brake accumulator charging valve (6) Steering cylinder crossover relief valve (7) Steering cylinder crossover relief valve (8) Parking brake solenoid valve (9) Steering control valve (10) Secondary steering pump (11) Spool (12) Line to braking system (13) Line to parking brakes (14) Portable hydraulic pump quick connect coupler (15) Check valve (16) Steering system pressure tap (17) Secondary steering diverter valve (18) Primary steering flow switch (19) Steering neutralizer valve (20) Oil cooler (21) Check valve (22) STIC steering pilot valve (23) Steering neutralizer valve (24) Selector and pressure control valve (25) Line from implement lift circuit (26) Dual pilot check valve (27) Check valve (28) Check valve (29) Pilot oil filter (30) Pilot system pressure tap (31) Pilot relief valve (32) Breaker relief valve (33) Hydraulic filters (34) Hydraulic tank (35) Pilot and braking pump (36) Steering pump | |
Note: Illustration 1 shows a machine with the secondary steering system. Machines without the secondary steering system will not have secondary steering pump (10), secondary steering diverter valve (17) and primary steering flow switch (18).
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| Illustration 2 | g01134525 |
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Location of the steering system components (1) Steering cylinder (2) Steering cylinder (3) Implement and steering solenoid valve (5) Brake accumulator charging valve (8) Parking brake solenoid valve (9) Steering control valve (10) Secondary steering pump (15) Check valve (17) Secondary steering diverter valve (19,23) Steering neutralizer valves (20) Oil cooler (22) STIC steering pilot valve (24) Selector and pressure control valve (27) Check valve (28) Check valve (29) Pilot oil filter (31) Pilot relief valve (32) Breaker relief valve (33) Hydraulic filters (34) Hydraulic tank (35) Pilot and braking pump (36) Steering pump | |
The steering hydraulic system is made up of two circuits: the pilot circuit and the high pressure circuit.
The main components of the pilot circuit are: hydraulic tank (34), pilot and braking pump (35), pilot relief valve (31), selector and pressure control valve (24), implement and steering solenoid valve (3), STIC steering pilot valve (22), steering neutralizer valves (19) and (23) and steering control valve (9).
The main components of the high pressure circuit are: hydraulic tank (34), steering pump (36), steering control valve (9), steering cylinder (1) and steering cylinder (2), hydraulic oil cooler (20) and hydraulic filters (33).
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| Illustration 3 | g01134534 |
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(2) Steering cylinder
(33) Hydraulic filters (behind cover) (34) Hydraulic tank (37) Hydraulic tank filler cap | |
Hydraulic tank (34) is located behind the guard on the right side of the machine. Remove hydraulic tank filler cap (37) to add hydraulic oil to hydraulic tank (34). Hydraulic filters (33) are located in hydraulic tank (34). If the oil restriction through hydraulic filters (33) is too high (hydraulic filters too dirty), a filter bypass valve in the tank will open and allow oil to bypass the hydraulic filters and return to the hydraulic tank.
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| Illustration 4 | g01138853 |
| (32) Breaker relief valve | |
Breaker relief valve (32) is located on the top of hydraulic tank (34).
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| Illustration 5 | g01134536 |
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(35) Pilot and braking pump
(36) Steering pump | |
The hydraulic system has a two section gear type pump. The two pump sections are: steering pump (36) and pilot and braking pump (35). The pumps use the hydraulic tank as a common reservoir.
The pump is mounted on the torque converter updrive housing and is driven by a gear inside the updrive housing. Steering pump (36) supplies oil for the operation of the steering system to articulate the machine.
Pilot and braking pump (35) supplies oil for the parking brake circuit and the service brake circuit. Pilot and braking pump (35) also supplies pilot oil for the steering circuit and implement circuit.
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| Illustration 6 | g01134537 |
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(5) Brake accumulator charging valve
(15) Check valve | |
Brake accumulator charging valve (5) and check valve (15) are located on the left side of the rear frame.
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| Illustration 7 | g01138913 |
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(29) Pilot oil filter
(31) Pilot relief valve | |
Pilot oil filter (29) and pilot relief valve (31) are located on the rear frame cross beam.
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| Illustration 8 | g01138914 |
| (28) Check valve | |
Check valve (28) is located on the rear frame cross beam.
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| Illustration 9 | g01134542 |
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(24) Selector and pressure control valve
(27) Check valve | |
Selector and pressure control valve (24) and check valve (27) are located on the left side of the rear frame.
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| Illustration 10 | g01134543 |
| (3) Implement and steering solenoid valve | |
Implement and steering solenoid valve (3) is located on the left side of the rear frame.
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| Illustration 11 | g01134544 |
| (22) STIC steering pilot valve | |
STIC steering pilot valve (22) is located under the cover on the operator station door.
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| Illustration 12 | g01134545 |
| (19) Steering neutralizer valve for a right turn | |
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| Illustration 13 | g01134546 |
| (23) Steering neutralizer valve for a left turn | |
Steering neutralizer valve (19) and steering neutralizer valve (23) are located below the upper articulation hitch.
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| Illustration 14 | g01134547 |
| (9) Steering control valve | |
Steering control valve (9) is located on the rear frame, behind the articulation hitch.
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| Illustration 15 | g01140813 |
| (20) Hydraulic oil cooler | |
Hydraulic oil cooler (20) is mounted to the radiator.
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| Illustration 16 | g01134549 |
| (10) Secondary steering pump | |
Secondary steering pump (10) is mounted on the front of the output transfer gear housing, above the centre drive shaft.
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| Illustration 17 | g01134550 |
| (17) Secondary steering diverter valve | |
Secondary steering diverter valve (17) is located on the right side of the rear frame near the hydraulic tank.