FMC Corporation - Talstar FMC L06 - Manual (Page 59)

Doc No: OMM50000903
Rev: B Page 59 of 65
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Pump runs
rough,
knocks, or
vibrates
(ONLY) -Broken or weak valve spring
-Valve damaged or unseated
-Loose plunger, piston, or rod
-Low oil level in power end
-Excessive connecting rod bearing
clearance
-Excessive main bearing clearance
-Worn wrist pin or bearing
-Pump running backward
-Loose sheaves or bushings (v-belt drive)
-Gear tooth cracked or broken
-Insufficient NPSHA
-Excessive acceleration head in suction line
-Pulsation dampener improperly charged
-Inlet line too long or too small in diameter
-Worn piston seal allows air ingress
(usually observed when booster not used) -Replace valve spring
-Repair/replace valve or re-seat
-Tighten loose components
-Fill to proper level
-Check cap torque or replace bearings
-Adjust end-play
-Replace worn components
-Correct rotation
-Tighten loose components
-Replace gear
-Provide more NPSH
-Install suction stabilizer
-Charge to proper pressure
-Increase suction pipe size
-Replace piston seal
Rapid suction
pressure
fluctuation -Pump cavitation
-Air is entering suction line -Increase suction size or NPSH
-Correct installation to stop leaks
Piping
vibration -Same as Pump runs rough above
-Excessive pressure variation in discharge
-Piping inadequately supported
-Excessive short-radius elbows or tees -See above
-Install discharge pulsation dampener
-Install supports at proper locations
-Correct installation to minimize turns and
short-radius fittings
Pump
requires
excessive
power -Discharge pressure too high
-Plungers or pistons too large
-Speed too high
-Packing too tight
-Misaligned coupling
-Belts too tight
-Power end bearings too tight
-Low motor voltage -Reduce system back-pressure or relief valve
-Install smaller plungers to reduce flow
-Reduce speed
-Loosen gland (Adjustable packing)
-Correct alignment
-Correctly adjust belt tension
-Increase end-play
-Supply correct voltage
Power end
overheats
(over 180° F)
and/or
reduced
power
component
end life -Discharge and/or suction pressure too high
-Oil level too high or too low
-Contaminated power end oil
-Incorrect oil viscosity or grade
-Misaligned coupling
-Belts too tight
-Pump running backward
-Pump located too close to heat source
-Worn or damaged power end bearings -Reduce pressure or reduce plunger size
-Adjust to correct oil level
-Refill with clean oil & eliminate contamination
-Fill with correct oil
-Correct alignment
-Correctly adjust belt tension
-Correct rotation
-Remove heat source or insulate power end
-Replace damaged bearings
Crankshaft
jerks or starts
and stops
rotation -Drive belts loose and slipping (if equipped)
-System relief valve pressure set too high
-Discharge line blocked or partially blocked -Correctly adjust belt tension
-Reduce relief valve pressure setting
-Clear obstructions from piping system