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SUPPORT-REAR-RH 9V9559 - Caterpillar

9V9559 SUPPORT-REAR-RH Caterpillar parts 508 SUPPORT
Alternative (cross code) number:
Caterpillar 9V9559 SUPPORT-REAR-RH
Weight: 16 pounds 7 kg.

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Compatible equipment models: 9V9559:

WHEEL SKIDDER  508   Caterpillar
Number on catalog scheme: 5
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Illustration 1 g00531699
(1) Load sensing line (2) Adjustment screw for margin pressure (3) Destroke pressure adjustment screwThe main hydraulic pump of the M320 is similar to the main pump on the smaller M300 Excavators. This pump is larger and the pump has increased flow. The pump regulator on the M320 is the same pump regulator that is on the 375 Excavator. The load sensing line (1) is a larger line than the load sensing line on the smaller machines. The larger line serves as an accumulator to dampen pressure surges in the load sensing signal pressure which is used to control the main pump.The adjustment screw for margin pressure (2) is used to adjust the margin pressure setting. The destroke pressure adjustment screw (3) is used to adjust the destroking pressure point of the main pump.Main Pump Regulator in Standby Position
Illustration 2 g00813093
When all the controls are in NEUTRAL position, the main pump is in the standby position. No load sensing pressure signal is directed from the main control valve to the pump regulator. As the pump pressure increases, the load sensing spool is pushed to the right against spring force. Since no load sensing pressure signal is present, the pump pressure increases to only the margin pressure setting.As the load sensing spool moves to the right, pump output pressure oil is directed around the load sensing spool, through the slow return check valve, around the horsepower control spool and to the destroke servo piston. The destroke servo piston is larger than the upstroke servo piston. The pressure oil in the destroke servo piston moves the swashplate toward the minimum angle in order to decrease flow.As the pump destrokes, flow decreases and the load sensing spool reaches a balance point, or a metering position. Then, the pump pressure oil is metered to the destroke servo piston. The pump swashplate reaches a balance point for standby flow.Main Pump Regulator in Upstroke Position
Illustration 3 g00813097
When a circuit is activated, the pump upstrokes.The following conditions can cause an increase in flow from the main pump:
An increase in the load sensing signal
An increase in power shift pressure from the proportional reducing valve
A decrease in pump output pressureThe load pressure signal for that circuit is directed through the load sensing signal line to the spring chamber on the right end of the load sensing spool. The increase in signal pressure pushes the load sensing spool to the left. Oil in the destroke servo piston is directed around the horsepower control spool, through the slow return check valve orifice, around the load sensing spool and to the tank drain. Pump pressure oil on the upstroke servo piston moves the swashplate toward the maximum angle.The slow return check valve decreases the upstroking speed of the pump in order to prevent sudden loads on the engine. The slow return check valve allows the pump to destroke at a faster speed than upstroking.Main Pump Regulator in Destroke Position
Illustration 4 g00813110
When the pump output pressure increases to the destroke pressure, the pump

Caterpillar parts catalog:

Caterpillar parts catalog

Parts support Caterpillar catalog:

215, 215B, 215C, 215D, 219D, 225, 225D, 227, 229, 229D, 231D, 235, 235B, 235C, 235D, 245, 245B, 245D, 350, 350 L, 375, 375 L, 385B, 508, 5080, 5090B, 518, 518C, 528B, 530B, 920, 950
225, 227, 235, 245, 508, 518, 518C, 528B, 530B, 816, 950
508, 935B, D3B, D3C, D5C
508, 518, 518C, 528, 530B, FB518
508, 518, 518C, 528, 530B, FB518
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