Troubleshooting - General Pump Pressure Washer System Installation, Operation & Service Manual

PROBLEM
Pulsation
Low pressure
Pump runs extremely rough,
pressure very low.
Water leakage from under
manifold. Slight leakage.
Oil leak between crankcase
and pumping section.
Oil leaking in the area of
crankshaft.
Excessive play in the end of
the crankshaft pulley.
Water in crankcase.
Oil leaking from underside
of crankcase.
Oil leaking at the rear portion
of the crankcase.
Loud knocking noise in pump.
Frequent or premature failure
of the packing.

TROUBLESHOOTING

CAUSE
Valve stuck open.
Faulty pulsation damper.
Worn nozzle.
Belt slippage.
Air leak in inlet plumbing.
Relief valve stuck; partially plugged or
improperly adjusted valve seat worn.
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.
Fouled or dirty inlet or discharge valves.
Worn inlet, discharge valve blocked or dirty.
Leaky discharge hose.
Restricted inlet or air entering the inlet plumbing.
Inlet restrictions and/or air leaks. Stuck
inlet or discharge valve.
Worn packing.
Cracked plunger.
Worn crankcase piston rod seals. O-rings
on plunger retainer worn.
Worn crankshaft seal or inproperly
installed oil seal o-ring.
Bad bearing.
Worn main bearing from excessive
tension on drive belt.
May be caused by humid air condensing i
nto water inside the crankcase
Worn packing and/or piston rod sleeve,
o-rings on plunger retainer worn.
Cracked plunger
Worn crankcase piston rod seals.
Scored piston rod.
Damaged crankcase, rear cover o-ring,
drain plug o-ring, or sight glass o-ring.
Pulley loose on crankshaft.
Broken or worn bearing on rod(s).
Valve stuck open or shut, or not opening enough. Replace bad valve.
Scored, damaged or worn plunger.
Overpressure to inlet manifold.
Abrasive material in the fluid being pumped. Install proper filtration on pump inlet plumbing.
Excessive pressure and/or temperature
of fluid being pumped.
Overpressure of pump.
Running pump dry.
Upstream chemical injection.
REMEDY
Check all valves, remove foreign matter.
Check precharge; if low, rechargeit or install a new one.
Replace nozzle, of proper size.
Tighten or replace; use correct belt.
Disassemble, reseal and reassemble.
Clean, adjust relief valve; check for worn and dirty
valve seats. Kit available.
Install proper filter. Suction at inlet manifold must be limited
to lifting less than 20 feet of water or -8.5 PSI vacuum.
Clean inlet and discharge valve assemblies.
Replace worn valve seats and/or discharge hose
Proper size inlet plumbing; check for air tight seal
Replace worn cup or cups, clean out foreign material,
replace worn valves.
Install new packing.
Replace plunger(s).
Replace crankcase piston rod seals. Replace
o-rings.
Remove oil seal retainer and replace damaged
o-ring and/or seals.
Replace bearing and any spacer or cover damaged
by heat.
Replace crankcase bearing and/ or
tension drive belt.
Change oil intervals. Use General Pump SAE 30
non-detergent oil.
Replace packing. Replace o-rings.
Replace plunger(s).
Replace seals.
Replace piston rod.
Replace cover or-ring, drain plug o-ring, or sight
glass o-ring.
Check key and tighten screw.
Replace bearing or rod(s).
Replace plungers.
Reduce inlet pressure.
Check pressures and fluid inlet temperature; be
sure they are within specified range.
Reduce pressure.
Do not run pump without water.
Use downstream chemical injection.
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