Trouble Location And Remedy - Pentair Myers Aplex Series Installation And Service Manual

Trouble
Excessive heat in power end.
(Above 180ºF)
Pump fails to deliver
required capacity.
Suction and/or discharge
piping vibrates or pounds.

TROUBLE LOCATION AND REMEDY

Possible Cause
Pump operating backward.
Insufficient oil in power end.
Excessive oil in power end.
Incorrect oil viscosity.
Overloading.
Tight main bearings.
Drive misaligned.
Belts too tight.
Discharge valve of a cylinder(s)
stuck open.
Insufficient cooling.
Pump speed too low.
Speed incorrect.
Belts slipping.
Air leaking into pump.
Liquid cylinder valves,
seats or plungers worn.
Insufficient NPSHA.
Pump not filling.
Makeup in suction tank less
than displacement of pump.
Vortex in supply tank.
One or more cylinders not pumping.
Suction lift too great.
Broken valve springs.
Stuck foot valve.
Pump valve stuck open.
Clogged suction strainer.
Relief, bypass, pressure
valves leaking.
Piping too small and/or too long.
Worn valves or seats.
Piping inadequately supported.
Correct rotation.
Fill to proper level.
Drain to proper level.
Fill with correct oil.
Reduce load.
Correct clearance.
Realign.
Reduce tension.
Fix valve(s).
Provide adequate cooling for oil or
reduce ambient temperature.
Increase speed.
Change drive ratio or tighten
belts (if loose). Correct motor speed.
Seal with compounds.
Reface or lap valves and seats;
replace packing or plungers.
Increase suction pressure.
Prime pump.
Increase makeup flow.
Reduce pump speed.
Increased liquid level in supply tank.
Install vortex breaker.
Prime all cylinders. Allow pump to
operate at low pressure through
bypass valve to eliminate vapor.
Decrease lift. Raise tank level.
Replace.
Clean.
Remove debris beneath valve.
Clean or remove.
Repair.
Increase size and decrease length.
Use booster pump. Use suction and/
or discharge pulsation dampeners.
Replace or reface.
Improve support at proper locations.
27
Remedy