992G Wheel Loader and 854G Wheel Dozer Steering System General Information (Steering) Caterpillar


General Information (Steering)
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Illustration 1g01074283

Steering System Hydraulic Schematic

(1) Left steering cylinder

(2) Right steering cylinder

(3) Shuttle valve

(4) Steering control valve

(5) Steering crossover relief valve for the cylinders

(6) Main steering relief valve

(7) Steering quad check valve

(8) Steering pressure reducing valve

(9) Steering pilot relief valve

(10) Steering neutralizer valve for right turn

(11) Steering neutralizer valve for left turn

(12) Pilot valve (STIC Steering)

(13) Steering pilot check valves

(14) Oil pressure switch

(15) Selector and pressure control valve

(16) Oil cooler

(17) Check valve (Cooler bypass)

(18) Fluid sampling port

(19) Piston pump (Steering)

(20) Breaker relief valve

(21) Steering pilot and brake oil filter

(22) Gear pump (Steering pilot)

(23) Hydraulic tank for the steering and brake systems

(A) Pressure port for the right steering cylinder

(B) Pressure port for the left steering cylinder

(C) Pressure port for the pilot circuit

(D) Pressure port for the steering pump

The steering hydraulic system is made up of three basic circuits:

  • Oil filter and oil cooler circuit

  • Pilot circuit

  • High pressure circuit

  • Secondary steering circuit (if equipped)

The main components of the oil filter circuit and the oil cooler circuit include the following items: steering pilot relief valve (9), oil cooler (16), cooler bypass check valve (17), steering pilot and brake oil filter (21), steering pilot gear pump (22) and hydraulic tank for the steering and brake system (23) .

The main components of the steering pilot system include the following items: steering quad check valve (7), steering pressure reducing valve (8), steering neutralizer valves (10) and (11), pilot valve (12), steering pilot check valves (13), steering pilot gear pump (22) and hydraulic tank for the steering and brake system (23) .

The main components of the high pressure steering system include the following items: left steering cylinder (1), right steering cylinder (2), shuttle valve (3), steering control valve (4), steering crossover relief valve (5), selector and pressure control valve (15), steering piston pump (19) and hydraulic tank for the steering and brake system (23).




Illustration 2g00118006

Left Side View

(1) Left steering cylinder. (4) Steering control valve. (10) Steering neutralizer valve for right turns. (11) Steering neutralizer valve for left turns. (16) Oil cooler. (19) Piston pump (steering). (21) Steering pilot and brake oil filter. (20) Breaker relief valve. (23) Hydraulic tank for the steering and brake system.

Hydraulic tank (23) is located on the left side of the machine next to the cab. Access is gained by opening an access door. Fill the tank to the correct oil level, if necessary. The filler cap is located on the top of the hydraulic oil tank for the steering and brake systems. Breaker relief valve (20) is located on the top of the hydraulic oil tank for the steering and brake systems.

Steering control valve (4), steering pressure reducing valve (8), and selector and pressure control valve (15) are located on the left side of the machine under the operator's cab.

Pilot valve (12) is located in the operator's cab.




Illustration 3g00118031

Component Locations

(19) Piston pump (steering). (22) Gear pump (steering pilot).

Steering piston pump (19) and steering pilot gear pump (22) are located in the pump area behind the operator's cab.




Illustration 4g00118054

Component Locations

(4) Steering control valve. (21) Steering pilot and brake oil filter.

Steering control valve (4) and oil filter (21) are located behind the cab. Oil filter (21) contains a bypass check valve. The bypass check valve is located in the base of the filter assembly.




Illustration 5g00118056

Component Locations

(7) Steering quad check valve. (10) Steering neutralizer valve for right turns. (11) Steering neutralizer valve for left turns.

Steering quad check valve (7), steering neutralizer valve (10) and steering neutralizer valve (11) are located near the articulated hitch and under the operator's cab.

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