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BOLT,WASHER AS 0878529 - Caterpillar



0878529 BOLT,WASHER AS Caterpillar parts BOLT
Rating:
11
Alternative (cross code) number:
CA0878529
087-8529
0878529
Caterpillar 0878529 BOLT,WASHER AS
Weight: 0.40 pounds 0 kg.

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Illustration 1 g03718446
Tamper Hydraulic System OFF (1) Displacement piston (2) Bias spring (3) Feedback spring (4) Check valve (5) Flushing control spool (6) Pressure compensator spool (7) Displacement control spool (8) Tamper solenoid (9) Tamper pump (10) From hydraulic tank (11) Displacement piston cavity (12) To case manifold (13) To hydraulic tank (14) To return filter (15) Case drain manifold (16) Left extender tamper motor (17) Left main tamper motor (18) Right main tamper motor (19) Right extender tamper motorWhen the engine is not operating, bias spring (2) forces the swashplate in tamper pump (9) to maximum angle. When the engine is started, the pump begins to produce flow. Supply oil is sent to displacement control spool (7), to pressure compensator spool (6), and to flushing control spool (5) which are inside the pump. Supply oil is also sent out port "B" of the pump.When the tamper is OFF, tamper solenoid (8) is not energized. In this situation, supply oil flows across displacement control spool (7) and divides into two branches. One branch directs oil into displacement piston cavity (11). The other branch directs oil to the chamber at the end of the displacement control spool.As the pressure in displacement piston cavity (11) increases, displacement piston (1) moves the swashplate in the pump toward minimum angle. At the same time, the pressure in the chamber at the end of displacement control spool (7) causes the spool to shift. This shift opens a passage for some supply oil to flow across the displacement control spool and into the pump case.At this point, pressure in displacement piston cavity (11) decreases, and bias spring (2) causes displacement piston (1) to increase the angle of the swashplate. Movement of the displacement piston causes feedback spring (3) to exert a greater force against displacement control spool (7). This movement closes the passage to the case drain, and more supply oil is forced into the displacement piston cavity. Eventually, the pump reaches equilibrium, and the pump produces enough flow to make up for system leakage. In this case, the pump does not produce enough flow to overcome the restriction of the tamper motors, and the motors do not operate.When the tamper is not operating, the force from the spring which acts on flushing control spool (5) is greater than pump supply pressure force. In this case, the flushing control spool allows some supply oil to flow into the pump case. This flow helps cool the pump.
Illustration 2 g03718447
Tamper Hydraulic System ON (1) Displacement piston (2) Bias spring (3) Feedback spring (4) Check valve (5) Flushing control spool (6) Pressure compensator spool (7) Displacement control spool (8) Tamper solenoid (9) Tamper pump (10) From hydraulic tank (11) Displacement piston cavity (12) To case manifold (13) To hydraulic tank (14) To return filter (15) Case drain manifold (16) Left extender tamper motor (17) Left main tamper motor (18) Right main tamper motor (19) Right extender tamper motorWhen the tamper system is operating, tamper solenoid (8) is energized. The


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