FMC Corporation - Talstar FMC L06 - Manual (Page 58)

Doc No: OMM50000903
Rev: B Page 58 of 65
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14.0 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 -Insure lines are connected and fill tank
-Insure 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
-Plunger or 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
-Adjust or replace packing or damaged parts
-Replace plunger or piston
-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
-Valve seat washed out in fluid cylinder
-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
-Repair or replace fluid cylinder
-Correct suction line installation