CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Vibratory System Piston Motor (Vibratory System) Caterpillar


Piston Motor (Vibratory System)
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1.1. Case Flushing



Illustration 1g00936998

Vibratory Piston Motor

(1) Flushing relief valve

(2) Port plate

(3) Piston

(4) Swashplate

(5) Shaft

(AA) First pressure reduction

(AB) System pressure

(AC) Sump

(AD) Activated components

The vibratory motor is a fixed displacement hydraulic motor. Oil flows to the motor and from the motor through hoses that are attached to the end cap.

High pressure oil from the pump enters the motor through the end cap. The oil will pass through port plate (2) and the oil will act on piston (3). The piston is one of seven pistons in the assembly of the cylinder block.

As the pistons react to the high pressure oil, the cylinder block and the pistons rotate as an assembly. The cylinder block is splined to shaft (5). Rotating torque is transferred to the shaft. The displacement of the motor is controlled by the angle of the fixed swashplate (4). The nonadjustable swashplate angle is machined into the motor housing.

Case Flushing




Illustration 2g00942091

Flushing valve

(1) Flushing relief valve

(6) Shim

(7) Flushing shuttle spool

(AA) First pressure reduction

(AB) System pressure

(AC) Sump

(AD) Activated components




Illustration 3g00942094

Hydraulic schematic for the motor

(1) Flushing relief valve

(7) Flushing shuttle spool

(8) Line (drain to return manifold)

(9) Pilot passages

(10) Loop lines

Lubrication for the internal moving parts is done with the normal internal leakage oil. The case flushing and the cooling of the pump and the motor is accomplished by the flushing circuit.

The flushing circuit oil is supplied by the charge circuit. The oil that flows over the charge relief valve allows continuous flushing of the vibratory pump. Case flushing of the motor occurs during the pump stroke. The oil travels through the motor flushing valve.

Oil enters the motor and oil exits the motor through loop lines (10). The pilot oil from the loop lines flows to both ends of shuttle spool (7). The flow is through pilot oil passages (9). The high pressure side of the circuit shifts the shuttle spool. The shift of the shuttle spool allows the low pressure oil of the loop lines to flow through the flushing relief valve (1). The oil flushes the motor housing and flows to the return manifold through line (8). The thermal bypass valve directs the oil through the oil cooler or to the hydraulic tank. The temperature of the oil will determine the direction of the oil.

The charge pump supplies approximately 20 L/min (5.3 US gpm). The charge pump replenishes normal leakage oil. The remaining charge oil will flow through the relief valve into the pump case relief valve, or the charge oil will flow through the flushing valve.

In order to flush the motor housing, the flow rate of the oil in the flushing relief valve (8) must be 4.9 L/min (1.3 US gpm).

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