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PZ-Series Petroleum Pumps—Troubleshooting Guide

Low Capacity

Possible Causes

What To Do

Pump speed too slow

Check engine speed and PTO ratio. Consult pump performance curve. Use tachometer on pump if speed is questionable.

High differential pressure

Restriction in discharge piping or hose too small. Pump speed too high.

Clogged strainer

Clean strainer

Suction pipe too small or restricted

Indicated by pump inlet presure dropping several pounds when pump is started. Remove restriction or modify piping.

Worn vanes

Replace.

Worn sideplates

Reverse or replace sideplates. Check universal drive assembly to make sure angularity is within limits, yokes are parallel and slip-joint is greased. Check bearings.

Vanes sticking

Remove vanes and clean out foreign material (check strainer). Replace vanes if swollen.

Corken, Inc.
A Unit of IDEX Corporation
3805 N.W. 36th Street, Oklahoma City, OK 73112 U.S.A.
(405) 946-5576
FAX (405) 948-7343