Pump Solutions Group Neptune Series 600 dia-PUMP MODELS 610 thru 647 - Manual (Page 18)

SYMPTOM CAUSE REMEDY
I. Low discharge pressure. A minimum discharge pressure of
50 psi is required to insure proper
capacity control.
3. Pump delivers erratically. A. Leaky suction line. Repair or replace piping.
B. Worn or dirty valves or seats,
or both. Clean or replace valve assembly.
C. Excessive excursion of ball
valves from seats (indicated by
ball chatter). Increase back pressure.
D. Insufficient suction pressure Increase suction pressure.
Raise tank level.
E. Liquid too close to boiling
point. Reduce temperature or raise
suction pressure.
F. Leaky system relief valve. Repair or replace relief valve.
G. Low hydraulic fluid level. Add hydraulic fluid.
4. Motor overheats thermal
overload activates. A. Power supply does not match
motor. Check power supply against
motor nameplate data.
B. Overload caused by operating
pump beyond rated capacity. Check operating pressure against
pump manufacturer data plate
maximum rating.
5. Noisy Operation.
1. In pump.
A. Pump Valves Valves must move to open and
close, and they will make a
clicking noise as they operate.
These noises are sometimes
amplified by natural resonance’s
in piping system. They are
usually indications of normal valve
functioning.
2. In Gear Reducer. A. Pounding noise at high
discharge pressure. Fluid compressibility causes
reversal of load on gears at end of
pressure stroke. Not considered
detrimental.
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SYMPTOM CAUSE REMEDY
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6. Oil level overflows reservoir.
A. Flexible diaphragm punctured. Replace diaphragm and hydraulic
fluid (drive lubricant) if
contaminated.
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