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COUPLING AS- 3236227 - Caterpillar

3236227 COUPLING AS- Caterpillar parts COUPLING
Alternative (cross code) number:
Caterpillar 3236227 COUPLING AS-
Weight: 0.36 pounds 0 kg.

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Illustration 1 g06058914
Front of Machine
(1) Auxiliary pump
(2) Cold-weather start solenoidAuxiliary pump (1) is at the front of the machine. The hopper doors provide access to the pump.Note: The pump stack orientation is referenced as viewed from the hopper.Auxiliary pump (1) is located in the upper left pump stack. The auxiliary pump is an axial-piston pump with variable-displacement. The pump is pressure-compensated.Auxiliary pump (1) has a cold-start feature. When the engine is being started in cold weather, the cold-weather start solenoid (2) is energized. In this case, the parasitic load of the pump is reduced for easier starting.When cold-weather start solenoid (2) is energized, pump supply pressure is directed into the bias piston. In this case, the bias piston moves the pump swashplate to minimum angle.The machine ECM energizes cold-weather start solenoid (2) when cold start parameters are met. The parameters are the hydraulic oil temperature is at or below 10 °C (50 °F), the engine is not running, and the starter is enabled. The solenoid remains energized until engine speed reaches a minimum of 900 rpm for more than 5 seconds. If the start is aborted, the solenoid remains energized for 10 seconds after engine speed returns to zero rpm.
Illustration 2 g06082827
Cross Section of Auxiliary Pump
(3) Pressure compensator spool
(4) Orifice
(5) Orifice
(6) Pressure compensator spring
(7) Cold weather start valve
(8) Bias spring
(9) Swashplate
(10) Slipper
(11) Slipper retainer
(12) Piston
(13) Barrel assembly
(14) From tank
(15) Valve plate
(16) Actuator piston
(17) To auxiliary systemsThe cross section view shown above illustrates the auxiliary pump operation at full flow with pump pressure at less than maximum.When the input shaft is rotated, barrel assembly (13) turns. Pistons (12) that are installed in the barrel assembly, also turn with the barrel assembly. One slipper (10) is attached to each piston. The slippers are held against swashplate (9) by slipper retainer (11).Slippers (10) allow the pistons to follow the angle of swashplate (9) as barrel assembly (13) rotates. As the slippers move down the swashplate ramp, the pistons on the downhill side of the swashplate are pulled out of the barrel assembly. Oil is drawn through valve plate (15) and into the piston bore in the barrel assembly. When a slipper reaches the bottom of the swashplate ramp, rotation of the input shaft forces the slipper to move up the ramp. Angled swashplate pushes piston (12) back into the barrel assembly. Oil is pushed out of the piston bore, through the valve plate, and into the output port.Angle of swashplate (9) determines how much oil is drawn into each piston bore. The angle therefore determines how much oil is pumped out of each piston bore per revolution of the input shaft. Greater swashplate angles pull more oil into the pump and discharge more oil through valve plate (15).Before the engine is started, bias spring (8) forces swashplate (9) to the maximum angle. As the engine is started, the pump immediately generates flow. The pump draws oil from the hydraulic tank through a screen. The pump delivers oil to pressure compensator spool (3) and

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