Pump Solutions Group Neptune Series 560 dia-PUMP - Manual (Page 17)

13
Symptom Cause Remedy
*3. Pump delivers
erratically.
A. Leaky suction line.
Repair or replace piping.
B. Worn or dirty valves seats, or both.
Clean or replace suction & discharge
Valve assemblies.
C. Excessive excursion of ball from
valve seats (indicated by ball
chatter).
Increase back pressure (install anti-siphon
spring).
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 Add hydraulic fluid.
4. Motor Overheats. 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’s 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 resonances 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.
6. Oil level overflows
Reservoir.
A. Flexible diaphragm punctured. Replace diaphragm and hydraulic fluid (drive
lubricant) if contaminated.
*Note: A diaphragm change may be needed for symptoms #2 & #3