PRESSURE CONTROL VALVE

TM 5-2420-222-20-1

HYDRAULIC SYSTEM -CONTINUED

Acts as flow divider of hydraulic fluid from hydraulic pump, steering valve, and hydraulic accumulator, to backhoe

and loader hydraulics.

Maintains hydraulic pressure available to steering and backhoe hydraulic components at expense - of loader

hydraulic components.

PRESSURE CONTROL VALVE-TO-JAW DIRECT LINEAR VALVE OIL LINE

Routes high pressure hydraulic fluid from pressure control valve to jaw direct linear valve, jaw direct linear valve-to-

backhoe control valve oil line, and jaw direct linear valve-to-hydraulic Impactor valve oil line.

JAW DIRECT LINEAR VALVE-TO-BACKHOE CONTROL VALVE OIL LINE

Routes high pressure hydraulic fluid from pressure control valve-to-jaw direct linear valve oil line at jaw direct linear

valve, to backhoe control valve.

JAW DIRECT LINEAR VALVE-TO-HYDRAULIC IMPACTOR VALVE OIL LINE

Routes high pressure hydraulic fluid from pressure control valve-to-jaw direct linear valve oil line at jaw direct linear

valve, to hydraulic impactor valve.

JAW DIRECT LINEAR VALVE

Fed by high pressure oil line from pressure control valve.

Returns low pressure hydraulic fluid through oil line to hydraulic oil filter relief valve.

Controlled by jaw control (direct linear) valve linkage.

Controls operation of jaw cylinder through high pressure oil lines.

JAW DIRECT LINEAR VALVE CHECK VALVE (NOT SHOWN)

Maintains hydraulic pressure in oil line to jaw cylinder rod end to keep jaw closed tight against bucket or

attachment.

JAW DIRECT LINEAR VALVE-TO-HYDRAULIC OIL FILTER RELIEF VALVE OIL LINE

Routes low pressure hydraulic fluid from backhoe control valve-to-jaw direct linear valve oil line and jaw direct linear

valve, to hydraulic oil filter relief valve.

JAW CONTROL (DIRECT LINEAR) VALVE LINKAGE

Mechanical linkage connected to jaw direct linear valve plunger.

Short pedal allows operator to open backhoe bucket jaw.

Long pedal allows operator to close backhoe bucket jaw.

JAW DIRECT LINEAR VALVE-TO-JAW CYLINDER OIL LINES (2)

Route high pressure hydraulic fluid between jaw direct linear valve and jaw cylinder.

1-45