3-1-618 Page 25
PROBLEM
POSSIBLE
CAUSE SUGGESTED
ACTION
Knock In Power End (continued).
8. Worn crankshaft.
8. Replace.
9. Worn crosshead.
9. Replace.
10. Worn main bearing.
10. Replace.
11. Valve noise transmitted to
11. See Excessive Valve Noise
power
end.
problem.
12. Cavitation noise transmitted to,
12. See Cavitation, Fluid Knock
or causing shock loading in,
or Hammer problem
power
end.
Excessive Valve Noise.
1.
Pump cavitation.
1.
See Cavitation, Fluid Knock
or
Hammer
problem.
2.
Seal on inserted valve
2.
Replaced seal or valve.
damaged or missing.
3.
Broken or weak valve spring(s). 3. Replace
spring(s).
Oil Leakage From Stop Head.
1.
Worn, damaged or corroded
1.
Replace extension rod.
extension
rod.
2.
Worn oil stop head packing.
2.
Replace packing.
3.
Oil level too high in
3.
Reduce oil level.
crankcase.
4.
Excessive crosshead wear.
4.
Replace crosshead.
5.
Pressure in crankcase.
5.
Clean or replace air breather.
Oil Seal Leakage.
1.
Worn sealing lip.
1.
Replace seal.
2. Damaged
sealing
lip.
2. Replace
seal.
3.
O.D. 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.
Pumped Fluid In Crankcase.
1.
Worn, damaged or corroded
1.
Replace extension rod.
extension
rod.
2.
Worn oil stop head packing.
2.
Replace packing.
3.
Extension rod baffles damaged/ 3.
Install new baffles.
missing.
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.
