8
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE SOLUTION
Pump won’t prime •Suction line problem •Check for leaks in suction line.
•Leaky check valves •Check for dirt or damaged check valves and replace.
•Check valves improperly installed •Check for proper installation.
•Outlet plugged •Check for blockage and clear.
•Motor not operating •Check power source.
•Repair or replace motor.
•Stripped or damaged gears •Check gear assembly and drive gear for damage.
Replace complete assembly if necessary.
Pump hums but will •Motor faulty •Replace motor.
not operate •Gear mechanism jammed •Check for free rotation of the gears.
Low pump capacity •Low voltage •Check power source.
•Leaky suction line •Repair leaks.
•Dirt in check valves •Dismantle and clean.
•Faulty check valves •Install repair kit.
•One or both diaphragms leaking •Install repair kit.
•One piston screw loose •Install new yoke assembly.
•Piston retainer screws loose •Install new yoke assembly.
•Debris ingested •Add inlet screen.
Motor overheats •Pumping hot fluids •Shorten duty cycle.
•Motor faulty •Replace motor.
Fluid leakage •Faulty or missing gaskets •Install all gaskets specified in parts list.
•Loose bolts •Torque all bolts to 50 in. lbs.
•Cracked component •Replace defective component.
•Piston retainer screws loose •Install new yoke assembly.
