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| Illustration 1 | g00918091 |
Hydraulic schematic for the steering system (1) Steering cylinder (2) Steering control valve (3) Steering oil filter (4) Steering metering pump (5) Manifold (6) Pilot oil filter (7) Pilot oil pressure reducing valve (8) Hydraulic tank (9) Screen (10) Breaker relief valve (11) Right neutralizer valve (12) Left neutralizer valve (13) Steering section of the gear pump (14) Brake and pilot section of the gear pump (15) Check valve (16) Secondary steering diverter valve (17) Secondary steering pump (AA) Steering system pressure tap | |
The purpose of the secondary steering system is to supply oil for the steering system should the steering pump system fail, or if the engine should stop while the machine is moving. It is also used to supplement the steering pump oil flow when the engine rpm and pump flow rate is low.
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| Illustration 2 | g00918089 |
Location of the secondary steering pump (17) Secondary steering pump | |
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| Illustration 3 | g00918090 |
Location of the secondary diverter valve (16) Secondary steering diverter valve | |
The main components of the secondary steering system are secondary steering pump (17) and secondary steering diverter valve (16) .
Secondary steering pump (17) is attached to the rear of the transmission output transfer gears. The pump is a ground speed driven pump that turns as long as the machine is moving.
Secondary steering diverter valve (16) is mounted to the front frame on the right side of the transmission compartment.
With the engine running, steering pump (13) sends oil to secondary steering diverter valve (16). The oil flows through the secondary steering diverter valve (16) to steering control valve (2). This oil is used to operate the steering cylinders.
When the machine starts to move, secondary steering pump (17) also starts to turn. As the pump turns it draws oil from hydraulic tank (8) and sends it to secondary steering diverter valve (16) .
When the machine moves and the engine rpm and steering pump flow is high, the secondary steering diverter valve sends the oil from the secondary steering pump back to the hydraulic tank (18). Steering pump (13) now provides all of the oil to the steering control valve. If, under this condition, there is a steering pump failure or the engine stops, the secondary steering diverter valve will route secondary steering pump oil to the steering control valve.