RING 5W5483 - Caterpillar

Illustration 1 g01383923
General Hydraulic System (1) Flow compensator spool (2) Pressure compensator spool (3) Bleed orifice (option) (4) Line to return filter in the hydraulic tank (5) Line to port "B"of cooler manifold (6) Generator motor (7) Relief valve (8) Flow control valve (9) Generator control solenoid (10) Generator pump (11) Bias piston cavity (12) Line from hydraulic tank port "2" (13) Line to port "L1" on the auxiliary pump (14) Displacement piston cavity (15) Line to tee on the left propel pump (16) Generator manifoldWhen the engine is not operating, the bias piston spring forces the swashplate in the generator pump to a maximum angle. When the engine is started, the pump begins to produce flow. Supply oil is sent to the pressure compensator spool and to the flow compensator spool. These spools are inside the pump. Also, supply oil is sent out of port "B" of the pump and supply oil is sent to port "P" of the generator manifold. When the generator is not operating, the generator control solenoid is de-energized. In this situation, supply oil is blocked at the spool of the generator control solenoid. As pressure increases in the system, supply pressure forces the flow compensator spool to shift against the combined force of the margin spring and signal pressure. This shift sends some of the oil into the displacement piston cavity. This causes the pump to destroke. As the swashplate angle decreases, the displacement piston uncovers a passage for oil to flow from the displacement piston cavity and into the pump case.At this point, supply pressure decreases, and the combined force from the margin spring and signal pressure causes the flow compensator spool to shift. This shift closes the passage for the supply oil to the displacement piston cavity. As a result, the swashplate angle increases. Eventually, the load sensing spool reaches equilibrium, and the pump operates at low pressure standby. At low pressure standby, the pump produces the flow needed in order to makeup for any system leakage. System pressure at low pressure standby is equal to signal pressure plus margin pressure.Note: Low pressure standby is not independently adjustable. Low pressure standby may vary from one machine to another machine. Also, low pressure standby may vary in the same pump as system leakage or pump leakage increases.
Illustration 2 g01383934
General Hydraulic System (1) Flow compensator spool (2) Pressure compensator spool (3) Bleed orifice (option) (4) Line to return filter in the hydraulic tank (5) Line to port "B"of cooler manifold (6) Generator motor (7) Relief valve (8) Flow control valve (9) Generator control solenoid (10) Generator pump (11) Bias piston cavity (12) Line from hydraulic tank port "2" (13) Line to port "L1" on the auxiliary pump (14) Displacement piston cavity (15) Line to tee on the left propel pump (16) Generator manifoldWhen the generator control switch is in the ON position, the generator control solenoid is energized. Pump supply oil flows through the