HOSE 3358529 - Caterpillar

Illustration 1 g01060605
992G Wheel LoaderSee Auxiliary View (Z) for 854G Wheel Dozer. (1) Steering Cylinders (2) Diverter Valve (3) Crossover Relief Valve (4) Shuttle Valve (5) Steering Control Valve (6) Relief Valve (7) Pressure Reducing Valve (8) Selector and Pressure Control Valve (9) High Pressure Screen (10) Steering Pump (11) Warning Switch (12) Case Drain Filter (13) Hydraulic Oil Tank
Illustration 2 g01060606
854G Wheel DozerAuxiliary View (Z) (2) Diverter Valve (9) High Pressure Screen (10) Steering Pump (12) Case Drain Filter (13) Hydraulic Oil TankThe steering pump supplies high pressure oil for the steering system. The steering pump can also supply supplemental pilot oil for the pilot oil system.During normal operation, steering pump (10) withdraws oil from hydraulic oil tank (13). High pressure oil then flows through high pressure screen (9). High pressure screen (9) is available on later models (ADZ, A4W, AZX and AMP) only. High pressure oil then travels through one of three routes.In the first route, the oil is sent to selector and pressure control valve (8). The selector and pressure control valve has a pressure switch that monitors the steering oil pressure. If steering oil pressure drops, an indicator in the cab alerts the operator of the problem.In the second route, the oil travels to diverter valve (2). The oil pressure keeps diverter valve (2) shifted downward. When the diverter valve is shifted downward, oil from the secondary oil pump is sent back to the hydraulic oil tank.In the third route, the oil flows to relief valve (6) and pressure reducing valve (7). Pressure reducing valve (7) is responsible for lowering high pressure oil to pilot oil pressure. The pressure reducing valve allows the steering pump to supply supplemental pilot oil if the pilot oil pump fails during operation.Excess oil from the steering pump flows through filter (12) for case drain oil. Machines that are equipped with VIMS have a filter bypass switch (11) that alerts the operator that the filter is clogged.When the operator moves the pilot control valve, pilot oil shifts steering control valve (5). When steering control valve (5) shifts, high pressure oil from the steering pump flows to steering cylinders (1). This allows the machine to articulate.An increase in pressure will occur if an outside force tries to steer the machine. The increase in pressure will open crossover relief valve (3). The crossover relief valve prevents the pressure in the steering cylinders from exceeding specifications.Shuttle valve (4) allows high pressure oil to travel through a load sensing line. The load sensing line travels back to steering pump (10).