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PROBLEM
Low pressure.
Pump runs extremely rough,
uressure low.
Water leakage from under
the manifold.
Water in pump crankcase.
Frequent or premature
failure of the packing.
Strong surging at the inlet
3nd low pressure on the
jischarge side.
CAUSE
Worn nozzle.
Belt slippage.
Air leak
in
inlet plumbing.
Relief valve stuck, partially
valve seat worn.
plugged or improperly adjusted
Inlet suction strainer clogged
o
improper size.
Worn packing. Abrasives in
pumped fluid or severe cavita-
tion. Inadequate water supply.
Fouled or dim/ 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
valve.
leaks. Stuck inlet or discharge
Leaking
H.P.
seals.
Worn packing.
condensing into water inside the
May
be caused by humid air
crankcase.
Scored plungers.
Over pressure to inlet manifold
Damaged or worn plungers.
Abrasive material
in
the fluid
being pumped.
Excessive pressure and/or tern
perature of fluid being pumped.
Over pressure of pumps.
Running pump dry.
Foreign particles
in
the inlet or
discharge valve, or worn inlet
and/or discharge valves.
SOLUTION
Replace
with
nozzle of proper size.
Tighten or replace; use correct belts and replac
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.
Proper size inlet plumbing; check for airtight
seal.
Clean out foreign material, replace worn valve:
Replace seals.
Install new packing.
Change oil at
3
month or
500
hour interval
using Graco Crankcase
Oil
(other approved
o
every month or
200
hours)
P.N.
801-144.
?eplace plungers.
?educe inlet pressure.
3eplace plungers.
nstall proper filtration on pump inlet plumbing
:heck pressures and fluid inlet temperature; bc
jure they are within specified range.
?educe pressure.
10
not run pump without water.
:heck for smooth lap surfaces on inlet and
iischarge valve seats. Discharge valve seats
md inlet valve seats may be lapped on
a
very
ine oil stone.