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PROBLEM
-0w~pressure.
’ump runs extremely rough,
Iressure low.
Nater leakage from under
:he manifold.
Nater in pump crankcase.
:requent or premature
ailure of the packing.
;trow surging
at
the inlet
lnd low pressure
on
the
lischarge side.
CAUSE
Worn nozzle.
Belt slippage.
Air leak in inlet plumbing.
Relief valve stuck, partially
plugged or improperly adjusted,
valve seat worn.
Inlet suction strainer clogged
01
improper size.
Worn packing. Abrasives in
pumped fluid or severe cavita-
tion. Inadequate water supply.
Fouled
or dirty inlet or discharge
valves.
Worn inlet or discharge valves.
Leaky discharge hose.
Restricted inlet or air entering
the inlet plumbing.
Inlet restrictions and/or air
‘eaks. Stuck inlet or discharge
talve.
-caking
H.P. seals.
vVorn packing.
May be caused by humid air
:ondensing into water inside the
:rankcase.
Scored plungers.
3ver pressure to inlet manifold.
lamaged or worn plungers.
4brasive material in the fluid
)eing pumped.
ixcessive pressure-and/or tem.
)erature of fluid being pumped.
her pressure of pumps.
lunning pump dry.
:oreign particles in the inlet or
lischarge valve, or worn inlet
Ind/or discharge valves.
SOLUTION
Replace with nozzle of proper Size.
Tighten or replace; use correct belts and replacl
both
at
same time.
Disassemble, reseal, and reassemble
Clean, and adjust relief valve; check for worn
and dirty valve seats.
Kit
available.
Clean. Use adequate size. Check more
frequently.
Install proper filter. Check flow available
to
..
pump.
Clean inlet and discharge valve assemblies.
Replace worn valves, valve seats and/or
discharge hose.
seal.
Proper size inlet plumbing; check for airtight
Clean out foreign material, replace worn valves
Replace seals.
Install new packing
Change oil
at
3
month or
500
hour intervals usins
Graco Crankcase Oil (other approved oil evenl
month or
200
hours)
P.N.
801-144.
Replace plungers,
Reduce inlet pressure.
Replace plungers.
Install proper filtration
on
pump inlet plumbing,
Check pressures and fluid inlet temperature; be
sure they are within specified range.
Reduce pressure.
Do
not run DumD without water.
801-392
5
Check for smooth lap surfaces
on
inlet and.
discharge valve seats. Discharge valve seats
and inlet valve seats may be lapped
on
a
very
fine oil stone.