3-1-618 Page 28
SECTION 5
TROUBLE-SHOOTING
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Pump Overloads Driver.
1. Excessive pump speed
1. Reduce pump speed and/or
and/or discharge pressure.
pressure.
2. Blockage or closed
2. Clean or open valve.
valve in discharge line.
3. Incorrect plunger size.
3. Install the correct
plunger.
4. Improper bypass conditions.
4. See recommended system
layout, and correct error.
Fluid Not Delivered.
1. Pump not primed.
1. Prime pump.
2. Air or vapor pocket in
2. Remove pocket from line.
suction line.
3. Clogged suction line.
3. Clean out line.
4. Suction and/or discharge
4. Remove the obstruction.
valves propped open.
Low Discharge Pressure.
1. Worn or fluid cut valve.
1. Replace valve assembly.
2. Valve propped open.
2. Remove the obstruction.
3. Pump cavitating.
3. See Cavitation, Fluid Knock
or Hammer problem.
4. Fluid leakage.
4. Replace plungers/packing
and/or fluid end seals.
5. Erroneous gauge reading.
5. Recalibrate or replace
gauge(s).
Low Suction Pressure.
1. Low head (NPSH).
1. Raise fluid supply level.
Install charging pump.
2. Insufficient charging pump
2. Increase charging pump
capacity.
speed or size.
3. Retarded fluid flow.
3. Remove restrictions
from suction line.
4. Erroneous gauge reading.
4. Recalibrate or replace
gauge(s).
