11-10
LARGE PISTON RELIEF VALVE
SECTION E-E
REPAIR PARTS KIT
329050
LARGE PISTON PUMP RELIEF VALVE
If the pump fails to lift faster under no load than it does under heavy load, the large piston relief valve may be dirty.
This valve is covered with sealing compound to prevent tampering with large piston changeover point. Remove sealing
compound, relief valve screw, valve spring and relief plunger. Use threaded socket tool (CP13-41) for removing
plunger. Clean and inspect valve hole. Inspect plunger packing and replace if necessary. To reassemble, dip plunger
packing in oil and carefully insert into hole, taking care not to damage packing during insertion of plunger. Reassemble
valve spring and valve screw. Tighten screw to obtain desired effort on lever bar at large pump changeover point. If
screw is tightened too far, it will restrict the relief valve movement and cause excessive handle effort throughout the
high-pressure cycle.
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