Probable Cause
Worn crankcase piston rod seals.
Solution
Replace crankcase piston rod seals.
Probable Cause
O-rings on plunger retainer worn.
Solution
Replace o-rings.
Solution
Replace plungers.
Probable Cause
Overpressure to inlet manifold.
Solution
Reduce inlet pressure.
Probable Cause
Abrasive material in the fluid being pumped.
Solution
Install proper filtration on pump inlet plumbing.
Probable Cause
Excessive pressure and/or temperature of fluid being pumped.
Solution
Check pressures and fluid inlet temperature; be sure they are within specified range.
Probable Cause
Over pressure of pumps.
Solution
Reduce pressure.
Probable Cause
Reduce pressure.
Solution
Do not run pump without water.
Solution
Flood suction then restart pump.
Solution
Disconnect discharge hose from pump. Flood suction hose, restart pump and run pump until all air has been evacuated.
Solution
Remove suction line and inspect it for a loose liner or debris lodged in hose. Avoid all unnecessary bends. Do not kink hose.
Probable Cause
Clogged suction strainer.
Solution
Clean strainer.
Solution
Make sure unloader is adjusted properly and bypass seat is not leaking.
Probable Cause
Incorrect or worn nozzle.
Solution
Make sure nozzle is matched to the flow and pressure of the pump. If the nozzle is worn, replace.
Probable Cause
Restricted intake.
Solution
Refer to above priming information.
Solution
Check suction manifold.
Solution
Clean or replace valves.
Probable Cause
Packing worn.
Solution
Replace packing.
Probable Cause
Pumped liquid temperature too high.
Solution
Reduce temperature of pumped liquid.
Solution
Control the valve and set new pressure level.
Solution
Check pre-charge; if low, recharge it or install a new one.
Solution
Replace with nozzle of proper size.
Probable Cause
Belt slippage.
Solution
Tighten or replace with correct belt.
Probable Cause
Air leak in inlet plumbing.
Solution
Disassemble, reseal and reassemble.
Probable Cause
Relief valve stuck, partially plugged or improperly adjusted valve seat worn.
Solution
Clean and adjust relief valve; check for worn or dirty valve seats. Kit available.
Probable Cause
Inlet suction strainer clogged or improperly sized.
Solution
Clean. Use adequate size. Check more frequently.
Probable Cause
Worn Packing. Abrasives in pumped in cavitation. Inadequate water.
Solution
Install proper filter. Suction at inlet manifold must be limited to lifting less than 20 feet of water or 8.5 psi vacuum.
Probable Cause
Fouled or dirty inlet or discharge valves.
Solution
Clean inlet and discharge valve assemblies.
Probable Cause
Worn inlet, discharge valve blocked or dirty.
Solution
Replace worn valves, valve seats and/or discharge hose.
Probable Cause
Leak in the discharge line.
Solution
Repair leak.
Solution
Check for air tight seal.
Probable Cause
Inlet restrictions and/or air leaks. Stuck inlet or discharge valve. Replace worn cup or cups.
Solution
Clean out foreign material. Replace worn valves.
Solution
Install new packing.
Solution
Remove oil seal retainer and replace damaged o-ring and/or seals.
Probable Cause
Bad bearing.
Solution
Replace bearing.
Solution
Replace crankcase bearing and/or tension drive belt.
Solution
Change oil intervals. Use any high grade automotive 30 weight non-detergent oil.
Probable Cause
Worn packing and/or piston rod sleeve, o-rings on plunger retainer worn. Replace packing.
Solution
Replace o-rings.
Solution
Replace seals.
Solution
Replace seals.
Solution
Check key and tighten set screw.
Probable Cause
Broken or worn bearing.
Solution
Replace bearing.