14
SECTION V
TROUBLE SHOOTING CHART
SYMPTOMS CAUSES REMEDIES
1. Pump Motor Will Not
Operate.
A. Blown Fuse. Check for short circuit or overload
Open thermal overload device in
starter.
Reset.
C. Low liquid level in tank (where low level
cut-off is used).
Fill tank.
D. Broken wire. Locate and repair.
E. Low voltage. Check for too light wiring.
F. Oil “frozen” in pump. Thaw out.
2. Pump Does Not Deliver
Rated Capacity
A. Starved suction.
Replace suction piping with larger size.
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
pressure slightly.
Air or gas trapped in oil or chemical
solution.
Decrease capacity to 20% for 7 mins.
then increase to 100% for 7 mins. Bleed
air from valve system
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 to 4” from bottom of solution tank.
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 backpressure.
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
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.
(35 pages)
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