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SECTION 5
TROUBLESHOOTING
Pump drive instruction manuals list most possible malfunctions, their causes and remedies. The follow-
ing problems are peculiar to Model XT and Model XW Pumps and may be repaired as indicated below.
SYMPTOMS REMEDIES
Pump motor won’t operate • No power. Supply correct power in accordance with motor
nameplate.
• Blown fuse. Check for short circuit or overload.
• Open thermal overload device in starter. Reset overload.
• Broken wire. Locate and repair.
• Low voltage. Check for too thin wiring.
• Low liquid level (where low level cutoff is used). Fill tank.
• Oil is frozen in pump. Thaw out.
• Bad motor. Replace motor.
Pump doesn't deliver rated capacity • Starved suction. Replace suction piping with larger size, or
increase suction head.
• Leaky suction piping. Repair or replace defective piping.
• Excessive suction lift. Rearrange equipment location to
reduce suction lift.
• Liquid too close to boiling point. Lower temperature or
increase suction pressure.
• Air in hydraulic or reagent system. Bleed system.
• Air or gas trapped in oil or pumpage. Decrease capacity to
20% for 5 mins. then increase to 100% for 5 mins.
• Worn or dirty valves or seats. Clean or replace cartridges.
• Viscosity of liquid too high (cps). Reduce viscosity by heat-
ing or other means, or increase size of suction piping, or
increase suction pressure.
• Insoluble materials; crystallization of liquid; settling of sol-
ids. Limit solution strength to proper value. Flush and
clean solution tank periodically. Suction connection should
be 2" to 4" from bottom of solution tank.
• Relief valve being actuated. Refer to symptom marked
with an *.
Erratic delivery • Leaky suction line. Repair or replace piping.
• Worn or dirty valves or seats. Clean or replace cartridges.
• Excessive excursion of ball valves from seats (indicated by
ball chatter). Replace cartridges.
• Insufficient suction pressure. Increase suction pressure by
raising tank level or pressurizing suction tank.
• Liquid too close to boiling point. Reduce temperature or
raise suction pressure.
• Leaky system relief valve. Repair or replace relief valve.
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