Nova-Tech LMI Series G - SG Metering Pump - Manual (Page 28)

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SECTION 5
TROUBLESHOOTING GUIDE
SYMPTOMS REMEDIES
Pump will not operate • Low process liquid level in the tank. Add liquid
• Worn or dirty check valves. Clean or replace.
• Blocked discharge line. Clear line.
• Frozen liquid. Thaw liquid throughout pumping system.
• Blown fuse. Replace fuse.
• Open thermal overload device in motor starter. Reset
device
• Broken wire. Locate and repair.
• Low voltage. Investigate and correct (wiring may be too
light).
• Pump not primed. Allow suction line and pump head to fill
with liquid before pumping against pressure. Refer to
“Filling Pumping System” in Section 3.
• Capacity adjustment set at zero. Readjust capacity.
Insufficient delivery • Incorrect capacity adjustment. Readjust capacity setting.
• Incorrect pump seed. Match live voltage and frequency to
pump motor data plate.
• Starved suction. Increase piping size or suction head.
• Leaky suction piping. Repair piping.
• High suction lift. Rearrange equipment to decrease lift.
• Liquid near boiling. Cool liquid or increase suction head.
• Leaky safety valve in discharge line. Repair or replace
safety valve.
• High liquid viscosity. Reduce viscosity (e.g., heat or dilute
liquid).
• Worn or dirty check valve seats. Clean or replace.
Erratic delivery • Leaky suction piping. Repair piping.
• Leaky safety valve. Repair or replace safety valve.
• Insufficient suction head. Raise suction tank level or pres-
surize tank.
• Liquid near boiling. Cool liquid or increase suction head.
• Worn or dirty check valves. Clean or replace.
• Clogged or dirty line strainer. Clean strainer.
Motor and pump body hot • Normal operating temperature of both motor and pump
body is frequently uncomfortable to the touch. However,
neither should exceed 200°F (93°C).
• Power supply does not match electrical requirement of
motor. Insure proper matching of power supply and
motor.
• Pump is being operated at greater than rated perfor-
mance. Reduce pressure or stroke speed. If this is not
practical, contact service facility.
• Pump improperly lubricated. Drain oil and refill with
proper amount of recommended lubricant.