GAUGE GP-COOLANT PRESSURE 1079028 - Caterpillar

Illustration 1 g00936755
(2) Steering pump (3) Cold start valve (4) Hydraulic oil cooler bypass valve (5) Hydraulic oil cooler (6) Steering charge circuit filter (7) Steering pilot valve (8) Steering motor (9) Case drain filter (10) Steering system pressure taps (11) Hydraulic tankCharge Pump
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Charge pump (1) is mounted on the rear of steering pump (2), which is mounted on the upper right of the torque converter housing. The charge pump is a positive displacement type pump which provides oil for the steering pilot circuit and charge oil for the steering closed loop.Cold Start Valve
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Cold start valve (3) protects the charge system against high pressures when the machine is first started and the hydraulic oil is cold. The higher viscosity of cold oil can cause system pressures to increase. Oil that passes over the cold start valve is returned to the suction port of the charge pump. The cold start valve is located in the rear of the engine compartment on the right side of the machine.Hydraulic Oil Cooler Bypass Valve
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The right side engine guard is removed for the photo.Hydraulic oil cooler bypass valve (4) is in the charge circuit between the charge pump and the oil cooler. The bypass valve closes in order to allow flow to the oil cooler when the oil is hot. The bypass valve opens in order to prevent oil from flowing to the oil cooler when the oil is cool enough. The bypass valve is located in the front lower right portion of the engine compartment.Hydraulic Oil Cooler
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Hydraulic oil cooler (5) uses air in order to dissipate heat from the charge oil circuit. The cooler is in the charge circuit between the hydraulic oil cooler bypass valve and the steering charge filter. The cooler is located in the front left side of the engine compartment directly behind the radiator.Steering Charge Circuit Filter
Steering charge circuit filter (6) is mounted on the front left side of the engine compartment. The charge filter is designed to trap debris in the oil in order to prevent damage to the steering system components.Steering Pilot Valve
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Steering pilot valve (7) is located inside the left operator's console and the valve is connected to the steering control lever. When the operator demands a turn, the pilot valve allows charge pump oil to shift the steering pump control valve. The steering pump control valve then allows charge oil to act upon the control piston. The linkage from the control piston moves the steering pump swashplate, which determines the output of the steering pump.Steering Pump
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The cab has been removed for the overhead photo.Steering pump (2) is an axial piston pump with overcenter capability. The steering pilot valve controls the output of the steering pump. The steering pump controls the speed and the direction of the steering motor. The pump is mounted on the upper right of the torque converter housing.The steering pump head also contains the charge pump relief valve, the pressure compensator valve, and the crossover relief