Troubleshooting Pumps & Unloader Valves
Troubleshoot common issues faced with pumps & unloader valves
Low Pressure in the Pump
Problem. Probable Cause. Solution. Pump runs normally but pressure is low. Pump is sucking air. Check inlet circuit and possibility of air ingress. Stuck valves. Check & clean, or replace if necessary. Unloader valve faulty. Check & replace if necess
Pressure Fluctuating/ Not Steady
Problem. Probable Cause. Solution. Pressure Fluctuating & not Steady. Jammed valves. Check & clean out if necessary. Pump is sucking air. Check inlet circuit and possibility of air ingress. Worn packings. Check & replace if necessary. Worn nozzle. Ch
Pump Losing Pressure After Some Period of Use
Problem. Probable Cause. Solution. Pump builds proper pressure, but starts dropping after some time of use. Worn check valves. Check & replace if necessary. Jammed check valves. Check & replace if necessary. Worn unloader valve seat. Check & replace
Noisy Pump/ Making Weird Sounds/ Knocking Sound
Problem. Probable Cause. Solution. Pump is more noisy than usual/ Making weird sounds. Inlet plumbing of improper size. Check & replace if necessary. Broken spring of the discharge valve. Check & replace if necessary. Worn. bearings. Check & replace
Presence of water in oil/ Oil looking milky
Problem. Probable Cause. Solution. Presence of water in oil (Oil looking milky). Worn oil seals. Check & replace if necessary. High humidity in the air. Check & change oil more frequently. Worn packings. Check & replace if necessary. Please reach out
Water leaking from the pump
Problem. Probable Cause. Solution. Water dripping from between the pump head & pump body. Worn O-ring plunger retainer. Check & replace if necessary. Worn packings. Check & replace if necessary. Water leaking from the piston (spring holder) or valve
Oil leaking from the pump
Problem. Probable Cause. Solution. Oil dripping from between the pump head & pump body. Worn oil seals. Check & replace if necessary. Worn packings. Check & replace if necessary. Oil leaking from the shaft side of the pump. Shipping cap instead of ve
Pressure fluctuating when letting go of gun trigger
Problem. Probable Cause. Solution. Pressure fluctuating when letting go of gun trigger. Leaky gun and/ or pressure hose. Check O-rings in the gun and look for holes in the hose. Replacement/repair as required. Worn O-rings in the pump head. Check & r
Excessive water return in the bypass at the operating pressure
Problem. Probable Cause. Solution. Excessive water return in the bypass at the operating pressure. Nozzle size is too small. Please refer nozzle size calculator at 1/4-in Quick-Connect Pressure Washing Spray Nozzles, Set of 5. Worn poppet and/ or sea
Pressure gauge fluctuating when the gun is on
Problem. Probable Cause. Solution. Pressure gauge fluctuating when the gun is on. Dirty unloader valve. Clean valves and lubricate parts. Worn packing seals in the pump. Check & replace if necessary. Worn check valves in the pump. Check & replace if
Very high pressure in the hose line when the gun shuts off
Problem. Probable Cause. Solution. Very high pressure in the hose line when the gun shuts off. Excessive tightening of the spring in the unloader valve. Turn the unloader valve counter- clockwise to reduce the pressure setting in the spring. If that