308-490 13
Troubleshooting
TYPE OF PROBLEM WHA
T T
O CHECK
If check is OK, go to next check
WHA
T T
O DO
When check is not OK refer to this column
(Continued)
Motor runs and pump strokes,
but output is low or there is no
Check for worn spray tip.
Follow
Pressure Relief Procedure
Warning
, then replace tip. See your
separate gun or tip manual.
output.
Check motor brushes; check for loose leads
and terminals, minimum 10 mm brush
length, broken or misaligned springs, or
brushes binding in holders. See page 14.
Replace parts as needed. See page 14.
Check motor armature for shorts by using
an
armature tester (growler).
Replace motor
. See page 17 .
Check to see if pump continues to stroke
when gun trigger is released. With pump on
and primed, trigger gun momentarily
, then
release and engage safety latch. Relieve
pressure, turn of
f and unplug sprayer
.
Repair pump. See manual 307–806 for
repair.
Check to see if intake valve ball and piston
ball are seating properly
.
Repair pump. See manual 307–806 for
repair.
Check for leaking around throat packing nut
which may indicated worn or damaged
packings.
T
ighten the packing nut/wetcup.
Repair pump. See manual 307–806 for
repair.
Defective pressure control transducer.
Replace pressure control transducer
. See
page 20.
Motor runs but pump does not
stroke.
Check displacement pump connecting rod
pin (20). See page 16.
Replace pin, if missing. Be sure retainer
spring (35) is fully in groove all around
connecting rod. See page 16.
Check for frozen or hardened material in the
pump (39).
Thaw
. See the NOTE below. Plug in sprayer
and turn on. Slowly increase pressure
setting to see if motor starts.
Be sure crank in drive housing rotates; plug
in sprayer and turn on briefly to check. T
urn
of
f and unplug sprayer
.
Check drive housing assembly for damage
and replace if necessary
. See page 24.
Motor is hot and runs
intermittently.
Determine if sprayer was operated at high
pressure with small tips, which causes low
motor RPM and excessive heat build up.
Decrease pressure setting or increase tip
size.
Be sure ambient temperature where sprayer
is located is no more than 32
C and sprayer
is not located in direct sun.
Move sprayer to shaded, cooler area, if
possible.
Determine in sprayer was turned on,
pressurized, but not operating for long
periods of time.
T
urn of
f sprayer whenever you stop
spraying for a while and relieve fluid
pressure.
NOTE:
Thaw the sprayer if water or water-based material has frozen in it, by placing it in a warm area. Do not try to
start the sprayer until it has thawed completely
. If material hardened (dried) in the sprayer
, replace the pump pack
-
ings. See pump manual 307–806.
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