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Doc No: OMM50001254
Rev: A Page 39 of 47
Subject to contractual terms and conditions to the contrary, this document and all the information contained herein are the confidential and exclusive
property of FMC Technologies, and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by FMC.
12.0
Trouble-Shooting Pumps
This chart is designed to aid in the solution of pump and pump system problems. Once
the problem has been identified, work through the possible causes and solutions until
the problem has been corrected.
SYMPTOM
POSSIBLE CAUSE
REMEDY
No flow from
pump
-No liquid in reservoir (tank)
-Inlet line valve closed
-Inlet strainer is totally clogged with
debris
-Crankshaft is not turning
-Ensure lines are connected and fill tank
-Ensure lines are connected and open valve
-Clean or replace strainer
-Check for power to drive and drive
connections
Insufficient
pressure
from pump
(ONLY)
-Pump speed is too low
-Relief valve improperly adjusted or
worn
-Insufficient system resistance (worn
nozzle)
-Worn check valves
-Excessive leakage from pump seals
-Check belt tightness or power to motor
-Check relief valve and adjust setting
-Properly service system
-Inspect check valves and repair or replace
-Adjust or replace packing or damaged parts
Insufficient
flow from
pump
(ONLY)
-Pump speed is too low
-Relief valve improperly adjusted or
worn
-Worn pump valves
-Excessive leakage from pump seals
-Piston worn
-Valve seat washed out in fluid
cylinder
-Check belt tightness or power to motor
-Check relief valve and adjust setting
-Inspect pump valves and repair or replace
-Replace piston cup or damaged parts
-Replace piston or cylinder
-Repair or replace fluid cylinder
Insufficient
flow or
pressure
AND rough
operation
(pump
pounds or
vibrates)
-All pump cylinders not primed
-By-pass or relief is piped back to
suction
-Inlet line too long or too small in
diameter
-Insufficient NPSHA
-Air leaks in suction line or fittings
-Vortex in tank near inlet pipe opening
-Air entering booster pump
-Pump valve stuck open or closed
-Valve assembly damaged or
unseated
-Gas pocket formation from high spots
in suction
-Prime all chambers
-Pipe back to reservoir (tank)
-Increase suction pipe size
-Provide more NPSH
-Correct installation to stop leaks
-Increase submergence or baffle to stop
vortex
-Correct installation of booster pump
-Clean and deburr valve
-Properly seat or repair valve
-Correct suction line installation