HEAD 2912696 - Caterpillar

Illustration 1 g00582706
The steering system schematic is shown with the retrofit filtration package. The retrofit filtration package includes filters: (13) and (32) . (1) Left steering cylinder (2) Right steering cylinder (3) Shuttle valve (4) Pressure relief valve for the steering system (5) Unloader spool for the secondary steering system (6) Pressure relief valve for the secondary steering system (7) Secondary steering diverter valve (8) Gear pump for the secondary steering system (9) Oil cooler for the steering and brake systems (10) Check valve for the oil cooler bypass (11) Crossover relief valve (12) Differential pressure switch for the oil screen (13) Oil screen for the steering pump output "STRG OIL FLTR" (14) Steering control valve (15) Check valves for the steering neutralizer valves (16) Pressure and flow compensator valve (17) Check valve for the steering pump (18) Fluid sampling port (19) Filter for the oil cooler circuit "STRG COOL FLTR" (20) Pressure switch for the oil filter (21) Gear pump for the oil cooler circuit (22) Left steering neutralizer valve (23) Right steering neutralizer valve (24) Steering pump (25) Small actuator piston (26) Large actuator piston (27) Steering pilot valve (28) Pressure switch for the steering system "STRG OIL PRES" (29) Steering pump (30) Selector and pressure control valve (31) Selector and pressure control valve (32) Case drain filter for the steering pump "LT or RT STRG CDRN ST" (33) Filter bypass switch for the case drain filter (34) Hydraulic tank for the steering and brake systems (A) Pressure tap for the rod end of the left steering cylinder (B) Pressure tap for the rod end of the right steering cylinder (C) Pressure tap for the head end of the left steering cylinder (D) Pressure tap for the head end of the right steering cylinder (E) Pressure test point for the cooler output (F) Pressure test point for the cooler inlet (G) Pressure test point for the steering pump (H) Pressure test point for the steering pumpThe steering system provides the high pressure oil that is needed to turn the machine. The steering pumps also supply oil to the steering pilot system. The steering system uses two variable displacement piston pumps (24) and (29). The steering pumps are load sensing pumps. The pumps are located near the top of the rear pump drive. There is a pressure and flow compensator valve (16) attached to each steering pump. The pressure and flow compensator valves control the amount and pressure of hydraulic oil that is delivered to the steering system from the steering pumps. Pressure and flow compensator valves (16) keep the oil pressure and flow from the steering pumps at a level that is needed in order to fulfill the requirements of the steering system.Steering pumps (24) and (29) draw hydraulic oil from hydraulic tank (34). The case drain oil from the steering pumps flows through case drain filters (32). The case drain filters remove debris from the oil. This prevents contamination of the oil that is in the