| Problem |
Cause |
Remedy |
| Pulsation |
Valve stuck open. |
Check all valves, remove foreign matter. |
| Low pressure |
Worn nozzle. |
Replace nozzle, use proper size. |
|
Air leak in inlet plumbing. |
Disassemble, reseal and reassemble. |
|
Relief valve stuck, partially plugged or improperly valve seat worn. |
Clean, adjust relief valve; check for worn and dirty valve seats. Kit available. |
|
Inlet suction strainer clogged or improperly sized. |
Clean; use adequate size. Check more frequently. |
|
Worn packing. Abrasives in pumped fluid or severe cavitation. Inadequate water. |
Install proper filter. Suction at inlet manifold must be limited to lifting less than 20 feet of water or -8.5 PSI vacuum. |
|
Fouled or dirty inlet or discharge valve. |
Clean inlet and discharge valve assemblies. |
|
Worn inlet, discharge valve blocked or dirty. |
Replace worn valves, valve seats and/or discharge hose. |
|
Leaky discharge hose. |
|
| Pump runs extremely rough, pressure very low |
Inlet restrictions and/or air leaks. Stuck inlet or discharge valve. |
Replace worn cup(s), clean out foreign material, replace worn valves. |
|
Restricted inlet or air entering the inlet plumbing. |
Proper size inlet plumbing, check for air tight seal. |
| Water leakage from under manifold. Slight leakage |
Worn packing. |
Install new packing. |
|
Cracked plunger. |
Replace plunger(s) |
| Oil leak between crankcase and pumping section. |
Worn crankcase piston rod seals. O-Rings plunger retainer worn. |
Replace crankcase piston rod seals. Replace O-Rings |
| Oil leaking in the area of the crankshaft |
Worn crankshaft seal or improperly install oil seal O-Ring. |
Remove oil seal retainer and replace damaged O-Ring and/or seals. |
|
Bad bearing. |
Replace bearing and any spacer or cover damaged or cover damaged by heat. |
| Water in the crankcase |
May be caused by humid air condensing into water inside the crankcase. |
Change oil intervals. Use SAE 30 non-detergent oil. |
|
Worn packing and/or piston rod sleeve, O-Rings on plunger retainer worn. |
Replace packing. Replace O-Rings. |
|
Cracked plunger. |
Replace plunger(s) |
| Oil leaking from underside of crankcase |
Worn crankcase piston rod seals. |
Replace seals |
|
Scored piston rod. |
Replace piston rod. |
| Oil leaking at the rear portion of the crankcase |
Damaged crankcase, rear cover O-Ring, drain plug O-Ring, or sight glass O-Ring. |
Replace cover O-Ring, drain plug O-Ring, or sight glass O-Ring. |
| Loud knocking noise in the pump. |
Pulley loose on the crankshaft. |
Check key and tighten setscrew. |
|
Broken or worn bearing or rod(s). |
Replace bearing or rod(s). |
|
Valve stuck open or shut, or not opening enough. |
Replace bad valve. |
| Frequent or premature failure of packing. |
Scored, damaged or worn plunger. |
Replace plungers. |
|
Over-Pressure to inlet manifold. |
Reduce inlet pressure. |
|
Abrasive material in the fluid being pumped. |
Install proper filtration on pump inlet plumbing. |
|
Excessive pressure and/or temperature of fluid being pumped. |
Check pressures and fluid inlet temperature, be sure they are within specified range. |
|
Over-pressure of pump. |
Reduce pressure. |
|
Running the pump dry. |
Do not run the pump without water. |
|
Upstream chemical injection. |
Use downstream chemical injection. |