Sympton | Possible Cause | Solution |
---|---|---|
Oil leak between crankcase and pumping section | Worn rod oil seals | Replace crankcase piston rod seals |
Frequent or premature failure of the packing | Cracked, damaged or worn plunger | Replace plungers |
Overpressure to inlet manifold | Reduce inlet pressure | |
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 | |
Running pump dry | Do not run pump without water | |
Pump runs but produces no flow | Pump is not primed | Flood suction then restart pump |
Pump fails to prime | Air is trapped inside pump | Disconnect discharge hose from pump. Flood suction hose, restart pump and run pump until all air has been evacuated |
Pump loses prime, chattering noise, pressure fluctuates | Air leak in the suction hose or inlet | Remove suction line and inspect it for a loose liner or debris lodged in the hose. Avoid all unnecessary bends. Do not kink hose |
Clogged suction strainer | Clean strainer | |
Low pressure at nozzle | Unloader valve is by-passing | Make sure unloader is adjusted property and by-pass seat is not leaking |
Incorrect or worn nozzle | Make sure nozzle is matched to the flow and pressure of the pump. If the nozzle is worn, replace | |
Worn packing or valves | Replace packing or valves | |
Pressure gauge fluctuates | Valves worn or blocked by foreign bodies | Clean or replace valves |
Seals worn | Replace Seals | |
Low-pressure | Worn nozzle | Replace with nozzle of proper size |
Belt slippage | Tighten or replace with correct belt | |
Air leak in inlet plumbing | Disassemble, reseal and reassemble | |
Relief valve stuck, partially plugged or improperly adjusted valve seat worn | Clean and adjust relief valve; check for worn or dirty valve seats | |
Worn packing. Abrasive in pumped in 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 | |
Worn inlet, discharge valve blocked or dirty | Replace inlet and discharge valve | |
Pump runs extremely rough, pressure very low | Inlet restrictions and/or air leaks | Clean out foreign material |
Stuck inlet or discharge valve | Replace worn valves | |
Water leakage from under manifold | Worn packing or cracked plunger | Install new packing or plunger |
Slight leak, oil leaking in the area of crankshaft | Worn crankshaft seal or improperly installed oil seal o-ring | Remove oil seal retainer and replace damaged 0-ring and/or seals |
Bad bearing | Replace bearing | |
Excessive play at the end of the crankshaft pulley | Worn the main bearing from excessive tension on drive belt | Replace crankcase bearing and/or tension drive belt |
Water in crankcase | Humid air condensing into water inside the crankcase | Change oil intervals |
Worn packing and/or cracked plunger | Replace packing. Replace plunger | |
Loud knocking noise in pump | Cavitation or sucking air | Check water supply is turned on |
Pulley loose on crankshaft | Check key and tighten set screw | |
Broken or worn bearing | Replace bearing |

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