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LINES GP-HEATER 3905040 - Caterpillar



3905040 LINES GP-HEATER Caterpillar parts LINES
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86
Alternative (cross code) number:
CA3905040
390-5040
3905040
Caterpillar 3905040 LINES GP-HEATER

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Upstroking is an increase of pump displacement due to an increased load. When the system requires more flow, signal oil from the steering control valve flows through line (6).The signal oil pressure combines with the force of spring (19). This causes flow compensator spool (4) to move to the left. When the spool moves left, the spool blocks the flow of pump oil through passage (16).While flow compensator spool (4) is to the left, the oil in the chamber of destroke piston (7) can flow into passage (21). The oil flows past the cavity of spring (20), past flow compensator spool (4), and through line (18). The oil then flows back to hydraulic tank (23).Oil from the steering pump flows through line (22) and into the chamber of upstroke piston (9). The combined force of the spring in upstroke piston (9) and of the oil in upstroke piston (9) moves swashplate (8) toward the maximum angle that causes the pump to upstroke.Destroking
Illustration 6 g01111223
Destroke of Steering Pump
(2) Steering pump
(4) Flow compensator spool
(5) Pump output
(6) Line from steering control valve
(7) Destroke piston
(8) Swashplate
(9) Upstroke piston
(16) Oil passage
(17) Pump control valve
(18) Line
(19) Spring
(20) Spring
(21) Oil passage
(22) Line
(23) Hydraulic tank
(24) Oil passage
(25) Oil passage
(AA) High pressure oil
(BB) Tank oil Destroking is a reduction in pressure when pump output decreases. Destroking occurs when the signal oil pressure through line (6) decreases from lower loads. While the steering control valve is in the NEUTRAL position, destroking occurs when the signal oil pressure through line (6) decreases to 0 kPa (0 psi).When the pump oil pressure in passage (24) is greater than the force of signal oil pressure and of spring (19), flow compensator spool (4) will move to the right and oil pressure in passage (16) flows past spool (4). The oil then flows through passages (25) and (21). The oil then flows into the chamber of destroke piston (7).Destroke piston (7) is larger than upstroke piston (9). Because of this difference in size, the oil pressure that is acting against the destroke piston exerts a greater amount of force than the combined forces that are acting against the upstroke piston.The oil pressure that is acting against destroke piston (7) overcomes the combined force of the oil and of the spring in upstroke piston (9). This causes destroke piston (7) to move to the left.As destroke piston (7) moves to the left, swashplate (8) moves toward the minimum angle. This causes the pump to destroke. As the angle of the swashplate moves toward the minimum angle, the pump output and the pump pressure decrease.Steering Pump in Low Pressure Standby
Illustration 7 g01111448
Steering pump during low pressure standby
(2) Steering pump
(4) Flow compensator spool
(5) Pump output
(6) Line from steering control valve
(7) Destroke piston
(8) Swashplate
(9) Upstroke piston
(16) Oil passage
(17) Pump control valve
(18) Line
(19) Spring
(20) Spring
(21) Oil passage
(22) Line
(23) Hydraulic tank
(25) Oil passage
(26) Oil passage
(AA) High pressure oil
(BB) Tank oil While the engine is running and the steering control valve is in the NEUTRAL position, there is no signal oil

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