Nova-Tech LMI Series G - SD Metering Pump - Manual (Page 46)

3. Erratic pump delivery.
4. Motor and pump body hot.
5. Pump still pumps even at zero
capacity setting.
6. Gear noise.
7. Loud knock with each stroke.
8. Noisy operation in liquid end.
SYMPTOMS POSSIBLE CAUSE REMEDY
a) Leaky suction piping.
b) Leaky safety valve.
c) Insufficient suction head.
d) Liquid near boiling.
e) Worn or dirty check valves.
f) Clogged or dirty line strainer.
a) Normal operating temperature of
both motor and pump body is
frequently uncomfortable to the
touch. However, neither should
exceed 200°F (93°C).
b) Power supply does not match
electrical requirement of motor.
c) Pump is being operated at
greater than rated performance.
d) Pump improperly lubricated.
a) Misadjusted capacity knob.
b) Insufficient discharge pressure.
a) Excessive backlash.
b) Worn bearings.
c) Wrong or insufficient lubricant.
a) Excessive gear set wear.
b) Worn bearings.
a) Noise in check valves.
a) Repair piping.
b) Repair or replace valve.
c) Raise suction tank level and/or
install foot valve in suction line.
d) Cool liquid or increase suction
head.
e) Clean or replace.
f) Clean strainer.
a) N/A
b) Insure proper matching of power
supply and motor.
c) Reduce pressure or stroke
speed. If this is not practical,
contact service facility.
d) Drain oil and refill with proper
amount of recommended
lubricant.
a) Readjust capacity setting.
b) Correct condition (e.g., install a
back pressure valve).
a) Consult service facility.
b) Consult service facility.
c) Replace or replenish lubricant.
a) Consult service facility.
b) Consult service facility.
a) Ball checks move up and down
with some force. A distinct
"clicking" noise is normal,
especially in metal piping
systems.
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