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PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Oil Seal Leakage.
1. Worn sealing lip.
1. Replace seal.
2. Damaged sealing lip.
2. Replace seal.
3. Outside diameter not seated.
3. Clean and polish bore of
oil seal housing.
4. Shaft rough at seal lip.
4. Clean and polish shaft or
replace wear sleeve.
5. Pressure in crankcase.
5. Clean or replace air breather.
Stuffing Box Leakage.
1. Short plunger/packing life.
1. See Short plunger/Packing
Life problem.
2. Worn packing rings/metal.
2. Replace packing rings/metal.
3. Seal leaking at fluid
3. Check seal, stuffing box
end.
groove and sealing surface.
4. Corrosion due to wrong
4. Determine and install correct
stuffing box material
stuffing box.
for pumped fluid.
5. Stuffing box bore worn.
5. Replace stuffing box.
Pumped Fluid In
1. Worn, damaged or corroded
1. Replace extension rod.
Crankcase.
extension rod.
2. Worn oil stop head seal.
2. Replace seal.
3. Stuffing box leakage.
3. See Stuffing Box Leakage
problem.
Short Valve Life.
1. Abrasives in pumped fluid.
1. Filter pumped product.
Use severe duty valves
with insert.
2. Valve not sealing.
2. Broken valve spring - replace.
Worn valve guide - replace.
Worn valve/seat - replace.
3. Pump cavitating.
3. See Cavitation, Fluid Knock or
Hammer problem.
4. Corrosion.
4. Treat pumped fluid.
Use different materials
for valves/seats.
Install sacrificial anodes
in suction manifold.
