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Basic Problem
Solving
YHAT TO CHECK
WHAT TO
DO
checkis OK, go to next check
When check is not OK, refer to this column
.
Check motor armature commutator for burn
spots. aouaesandextremerouahness. Remove
motor Eovir and brush inspectron plates to
check. See page 21.
.
Checkmotorarmatureforshorts usina armature
I
~
5. Remove motor and have motor shop
I
resurface commutator if possible. See
page 26.
16. Replace motor. See page 26.
tester (growler) or perform motor tesL
See page 19.
.
Check leads from pressure control
and motor to 7. Replace loose terminals; crimp to leads.
motor start board (47) to be sure they are se-
curely fastened and properly mated.
Be sure male terminal blades are straigh
and firmly connected to mating part.
~~
, C h e c k motor start board (47) by substituting
8. Replace board. See page 27.
with
a
good board. See page 27.
I
CAUTION:
Do
not perform this check until mo-
tor armature is determined to be good. A bad
motor armature can burn
out a good board.
and white power cord terminals; connect volt 27.
should read VAC. Unplug sprayer.
meter to these leads. Plug in sprayer. Meter
.
Check power supplycord (50). Disconnectblack 9. Replace power supply cord. See page
0.
Check ON/OFF switch-(52). Disconnect the
' E
wire between motor start board
(47) and switch
and connect volt meter between exposed
terminal
on
switch and power cord's white wire.
Plug in sprayer and turn ON. Meter should read
VAC. Turn
off and unplug sprayer.
1.
Check motor thermal cutout switch. Connect
ohmmeter between motor's red leads.
Meter
should read
1
ohm maximum..
2. Remove pressure control (64) and check micro-
switch operation with ohmmeter:
(1)
With pressure knob at lowest setting and
stem pushed into control, readings should
be: white &black = 1 ohm max.
white &red = open.
(2) With pressure knob at highest setting,read-
white
ti
red = 1 ohm max.
ings should be: white & black = open;
3. Check pressure transducer (29) for hardened
paint
or damaged or
worn
components.
See
page 30.
10. Replace ONlOFF switch. See page 27.
11.
Allow motor to cool. Correct cause of
overheating.
If
switch remains open aftel
motor cools, replace motor.
-
12. Replace pressure control. See page 30.
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~~
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13. Replace transducer. See page 30. Thor-
ough system flushing
will
help extend lifl
of transducer.
Intermediate Problem Solving
~~
~
~
TYPE
OF
PROBLEM
WHAT TO CHECK
If checkis OK.
(10
to next check
Low output
1.
Check for worn spray tip.
. -
!
When check
is
not OK refer to this column
redace tio. See Your seDarate
aun
or
tiD
'
manual.
'
2.
Be sure pump does not continue to stroke when 2. Service pump. See page
22.
gun trigger is released. Plug in and turn on
sprayer. Prime with paint. Trigger gun momen-
tarily, then release and lock safety latch. Relieve
pressure, turn
off and unplug sprayer.
16
308-216
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