13
P100-991-400B
Problem
Probable Cause
Solution
Motor/Pump
Does Not
Operate:
No power.
Supply correct power according to motor requirements.
Blown fuse/tripped circuit
breaker.
Replace/reset, eliminate circuit overload.
Shaft coupling to pump not in
place.
Install proper coupling hardware (see parts list).
Current overload - motor.
Motor not rated for pump operating conditions - install proper motor.
Thermal overload - motor.
Motor not rated for pump and/or ambient operating conditions - supply
cooling or install proper motor.
Faulty motor drive/controller.
Repair/replace.
Faulty motor.
Repair/replace.
Low liquid level in supply tank
(if low-level shut-off is used).
Fill tank.
No Delivery
Supply tank empty.
Fill tank.
Inlet line or strainer clogged.
Clear debris and flush, or replace.
Inadequate supply pressure at
pump inlet.
Increase supply pressure by raising fluid level in tank, raising tank, or
pressurizing suction tank.
Inlet line too restrictive.
Increase inlet line diameter and/or decrease inlet line length.
Fluid viscosity too high.
Reduce viscosity if possible (by heat or some other means). Increase inlet
line diameter and/or decrease inlet line length. Increase supply pressure.
Vapor lock/cavitation.
Increase inlet pressure. Decrease fluid temperature.
Pump valves held open or
worn out.
Clear debris and flush, or replace (see Fluid End Service)
System relief valve actuating.
Adjust relief valve, or repair, clean, or replace with new relief valve.
Delivery Too
Low and/or
Erratic
Review all Probable Causes and Solutions in Problem No Delivery above.
Air leak(s) in inlet line.
Locate all leaks and repair.
System back pressure too low. Adjust back pressure valve to higher setting. Install back pressure valve if
none in system.
Pumped fluid characteristics
changed.
Monitor supply tank temperature to determine if fluid is too hot (leading to
cavitation) or too cold (increasing fluid viscosity). Stabilize temperature
at suitable level to resolve problem. Check for entrapped air in the fluid
supply system.
Inlet supply pressure changed. Monitor inlet supply pressure (at the pump) to determine if it is too low,
causing a starved condition/cavitation. Stabilize pressure at suitable level
to resolve problem.
Pump OK - Calibration system
or flow meter error.
Evaluate components and repair/correct problem(s).
Oil condition in pump hydraulic
end changed.
Check oil level - if low evaluate for source of leakage. Consult factory for
hydraulic end service.
Change oil per recommended guidelines in maintenance section.
Delivery Too
High and/or
Erratic.
System back pressure too low. Adjust back pressure valve to higher setting. Install back pressure valve if
none in system.
Inlet supply pressure changed. Monitor inlet supply pressure (at the pump) to determine if it is too high,
causing a “flow-through” condition. Stabilize pressure at suitable level to
resolve problem.
Pump OK - Calibration system
or flow meter error.
Evaluate components and repair/correct problem(s).
P100 Troubleshooting
