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TO REPLACE SPRING/PISTON OR CHANGE DIRECTION OF PUMP
To replace spring and/or piston or to change direction of rotation, shut pump off, remove seal cap
and gasket. Loosen locknut and adjust relief valve pressure to minimum. Remove bonnet and
gasket making sure that the spring pressure does not force bonnet out too rapidly. Remove plug
cap and gasket from faceplate. Check all parts and internal passages to make sure that they are
clean and free from rust or damage. To assemble, determine direction of rotation and replace
plug cap and gasket as shown in direction of rotation. Place poppet and spring in correct position
according to direction of rotation.
Turn adjusting screw to have shoulder flush with bonnet, place spring guide on adjusting screw;
install gasket and assemble into faceplate making sure spring engages over spring guide.
Tighten bonnet. Reinstall gasket and plug cap, if removed. Adjust relief valve pressure as
described.
A built-in relief valve should not be used on applications where the discharge must be closed for
more than a few minutes. Prolonged operation with the relief valve fully by-passing will cause
heating of the liquid circulating thru the valve, thus resulting in possible damage.
CHECK POPPET PERIODICALLY TO MAKE SURE THAT IT WILL SLIDE
FREELY IN PUMP FACEPLATE. FAILURE TO SLIDE DUE TO BINDING OR
FOREIGN MATERIAL WILL CAUSE EXCESSIVE PRESSURE BUILDUP IN
PUMP.
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