Pump Solutions Group Neptune Series 560 dia-PUMP - Manual (Page 16)

12
SECTION V
TROUBLE SHOOTING CHART
Symptom Cause Remedy
1. Pump Motor Will Not
Operate.
A. Blown Fuse. Check for short circuit or overload.
B. Low liquid level in tank (where low
level cut-off is used).
Fill tank.
C. Broken wire. Locate and repair.
D. Low voltage. Check for too light wiring.
E. Oil “frozen” in pump. Thaw out.
*2. Pump Does Not
Deliver Rated Capacity
A. Starved suction. Replace suction piping with larger size, or
increase suction head.
B. Leaky suction piping. Pressure test, repair or replace defective
piping.
C. Excessive suction lift. Rearrange equipment location to reduce
suction lift.
D. Liquid too close to boiling point. Lower temperature or increase suction head
pressure slightly.
E. Air or gas trapped in oil or chemical
solution.
Decrease capacity to 20% for 7 minutes,
then increase to 100% for 7 minutes.
F. Worn or dirty valves or seats, or
both.
Clean or replace.
G. Viscosity of liquid too high. (1) Reduce viscosity by heating or other
means.
(2) Increase size of suction piping.
(3) Increase suction pressure slightly
H. Insoluble materials, crystallization or
solids settling.
Limit solution strength to 5% by weight.
Flush and clean solution tank periodically.
Suction connection should be 2" - 4" from
bottom of solution tank.
I. Low discharge pressure. A minimum discharge pressure of
50 psi is required to insure proper capacity
control.
J. Air in hydraulic or chemical systems. Bleed system.