METER ASSEM. 8S1609 - Caterpillar

Illustration 1 g00936998
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. Oil flows through the center of the piston and through the piston slipper in order to create a film of oil between the piston slipper and the swashplate. This helps prevent wear. 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 2 g00942091
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 3 g00942094
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.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).