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DIAGNOSIS AND MAINTENANCE CONT
I
PROBLEM
Short
cup life
(Cont.)
inlet and
low
pressure
Strong surging a the
on
the discharge side.
Water leaking
from
valve stem
I
Short piston seal life.
I
Electric motor
won't
I
run'
while spraying
Electric motor stops
Electric motor
runs,
when starting; blows
Electric
motor
labors
fuses
PROBABLE CAUSE
Abrasive material
in
the fluid being
pumped.
fluid being pumped.
Excessive pressure and/or temperature of
Improper installation of cups.
Overpressure of pumps.
Running pump dry.
Front edge of piston sharp.
Chrome plating of cylinders damaged
causing excessive wear of cups. May be
caused
bv
Dumping acid solution.
Foreign particles
in
the inlet or discharge
valve or worn inlet and/or discharge
valves.
Norn piston seal.
-oose cleanout port
nut.
-eak
in
discharge hose.
.oose
stuffing box.
scored piston sleeve.
4brasives
in
water.
~ ~~~
'ower cord unplugged, or building circuit
use
blown.
lverload switch has opened.
'ower cord unplugged, or building circuit
use
blown.
lverload breaker has opened.
Ixtension cord.
-ip plugged.
)isplacement pump frozen or gear train
lamage.
:aDacitor failure.
SOLUTION
Install proper filtration of pump inlet
plumbing.
Check pressures and fluid inlet
temperature; be sure they are within
specified range.
groove on the
piston. If not properly in.
Properly install
lip of new cup into
stalled, the cup
will
be extruded past th
piston. Piston will run eccentric;
premature failure will result.
Reduce pressure.
Do
not run pump without water.
Replace with new piston.
Install new cups and cylinders. Pump
only fluid compatible with chrome.
:heck for smooth lap surfaces on inlet
and discharge valve seats. Discharge
valve seats and inlet valve seats.
Discharge valve seats and inlet valve
seats may be lapped on a very fine oil
stone; damaged cups and discharge
valves cannot be lapped but must be
.eplaced.
3eplace seal assembly.
righten nut.
3eplace hose.
righten.
3eplace piston sleeve.
:lush
with
clean water.
:heck, replace.
Jnplug power cord', decrease pressure.
:heck, replace.
Jnplug power cord', relieve~pressure-
IllOW
to cool.
Ion't
use
more
than
100
h
of
12
ga ex-
ension cord.
lemove and clean.
.haw
leplace capacitor.
'This
unit
has an overload breaker
built
into the switch assembly. If
it
opens, unplug power cord and let sprayer cool for
30
to
60
minutes. Also, try to correct the cause of overheating. Always
use
the lowest pressure setting needed.