Revision 2
5.
Excessive High Pressure Pump Noise
Note:
It must
be
understood that the valves
in
the high pressure pump's fluid cylinder are
inherently noisy. The typical noise from the valves
may
be mistaken for bearing
noise in the pump.
Probable Cause
a.
Insufficient lubricant
levels
b. Loose plungers
Corrective Action
Fill the high pressure pump's crankcase
to
raise oil level
to
the top mark on the sight gauge. Check level again
with the pump running. The oil level should now be even
with the lower mark on the sight gauge.
If
enough oil is
in the crankcase, proceed
to
Probable Cause "b".
Check
to
see if any plungers are loose from the crosshead
stubs.
If
loose, apply some blue LOCTITE® between
faces
of
plunger and crosshead, then tighten firmly.
If
plungers are tight, proceed
to
Probable Cause "c".
c.
Worn crankshaft bearings Check for bearing clearance. Refer
to
Section 8:
d.
Worn crosshead or
crosshead pins
e.
Pump cavitation
REPAIR.
Check crosshead clearances with cylinder wall and
crosshead pin. Refer
to
Section 8: REPAIR.
See Symptom #1: Excessive Pulsation
in
High Pressure
Pump
Discharge.
6.
Excessive V-belt Slippage or Wear
Probable Cause Corrective Action
a.
Belt tension too low Adjust belt tension.
b.
Gritty material between Clean sheaves.
belt and sheaves
c.
Sheaves not locked
to
Align sheaves on shaft and tighten down set screws.
shaft
d.
Loose belt A new belt may stretch substantially during the first two
(2) weeks of use. Check tension frequently.
e.
Oil
or
grease on belt Replace belt.
© Copyright December, 1999 NLB Corporation
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