Pump Solutions Group Neptune Series 500 MODEL 481 THRU 547 - Manual (Page 18)

15
SECTION V
TROUBLE SHOOTING CHART
SYMPTOMS CAUSES REMEDIES
1. Pump Motor Will Not Operate. A. Blown Fuse. A. Check for short circuit or overload.
B. Open thermal overload device in
starter or motor.
B. Reset.
C. Low liquid level in tank (where low
level cut-off is used).
C. Fill tank.
D. Broken wire. D. Locate and repair.
E. Low voltage. E. Check for too light wiring.
F. Oil “frozen” in pump. F. Thaw out.
*2. Pump Does Not Deliver Rated
Capacity
A. Starved suction.
A. Replace suction piping with larger
size, or increase suction head.
B. Leaky suction piping.
B. Pressure test, repair or replace
defective piping.
C. Excessive suction lift.
C. Rearrange equipment location to
reduce suction lift.
D. Liquid too close to boiling point.
D. Lower temperature or increase
suction head pressure.
E. Air or gas trapped in oil or
pumpage.
E. Decrease capacity to 20% for 5
mins., then increase to 100% for 5
mins.
F. Worn or dirty valves or seats, or
both.
F. Clean or replace.
G. Viscosity of liquid too high (CPS). G. (1) Reduce viscosity by heating or
other means;
(2) Increase size of suction piping;
(3) Increase suction pressure
H. Insoluble materials settling out, or
crystallization of saturated
solution.
H. Check solution strength.
Flush and clean solution tank
periodically. Suction connection
should be 2 to 4” from bottom of
solution tank.
I. Low discharge pressure. I. A minimum discharge pressure of
50 psi is required to insure proper
capacity control.
J. Capacity adjustment set above
100% capacity mark.
J. Reposition adjustment knob to
100% mark.
K. Air in hydraulic or chemical
systems.
K. Bleed system.