PUMP GP-GEAR 3295735 - Caterpillar

Illustration 1 g01100318
Location of hydraulic components (1) Floor check valve (2) Elevator motor (3) Directional valve (4) Crossover relief valves (5) Bowl cylinders (6) Steering cylinders (7) Servo cylinder (8) Main control valve (9) Load cylinder (10) Supplemental steering pump (11) Selector valve (12) Steering valve (13) HMU check valve (14) Hand metering unit (15) Oil cooler (16) Check valves (17) Screen (18) Hydraulic tank (19) Return filter (20) Cushion-hitch pump (21) Accumulator (22) Implement and steering pump (23) Case drain filter (24) Elevator pump (25) Cushion-hitch pump (26) Floor cylinder (27) Ejector cylinder (28) Blocker valve
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Tractor (8) Main control valve (23) Case drain filter (24) Elevator pump (25) Cushion-hitch pump
Illustration 3 g01100418
Scraper (2) Elevator motor (3) Directional valve (4) Crossover relief valves
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Left rear view of tractor (22) Implement and steering pump (24) Elevator pump (25) Cushion-hitch pump (28) Blocker valve (29) Transfer case and gear groupThe 623E Wheel Tractor-Scraper uses three hydraulic pumps. Vane pump (22) is a two-section pump that is used for the implement and steering circuits. Piston pump (24) is used for the elevator circuit. The control valve that is mounted to pump (24) contains the main relief valve that is used in the elevator circuit. Axial piston pump (25) is used for the cushion-hitch system. Pump (24) and pump (25) are bolted together. Pump (24) and pump (25) are also mounted on the back of transfer case and gear group (29). Pump (22) is mounted on the front of transfer case and gear group (29). All pumps turn at the engine rpm.
Illustration 5 g01100282
Inside left tractor fender (8) Main control valveMain control valve (8) for the implements is located on the left side of the tractor and on top of the differential housing. Main control valve (8) is manually operated. The top stem controls the pilot signal to the elevator pump and to the valve for the elevator. The middle stem controls the flow of oil to the ejector cylinder. The bottom stem controls the flow of oil to the bowl cylinders. A common rail connects one end of all of the stems to a common line back to the tank.
Illustration 6 g01100290
Scraper control levers (A) Bowl control lever (B) Ejector control lever (C) Elevator speed control lever (D) Direction control lever for the elevatorThe control levers for the scraper are at the right side of the seat for the operator. Rods and levers are used to connect the control levers to the valve stems in the control valve.
Illustration 7 g01100291
Right rear view of tractor (23) Case drain filter (29) Transfer case and gear groupCase drain filter (23) is located to the right of transfer case (29). Case drain oil from elevator pump (24) and elevator motor (2) is routed through filter (23). If filter (23) becomes full of debris, oil can not pass through filter (23). The restriction to flow causes a pressure increase which opens the bypass valve in filter (23). A pressure of 140 kPa (20 psi) will cause the bypass valve to