308-319
17
Troubleshooting
WARNING
To reduce the risk of serious injury, always follow
the
Pressure Relief Procedure
on page 3 before
checking or repairing any part of the sprayer.
Check everything in the guide before disassembling
the sprayer.
NOTE:
Thaw sprayer if water or water–based paint
has frozen in it, due to exposure to low temperatures,
by placing it in a warm area. Do not try to start sprayer
until it has thawed completely or damage to motor and/
or control board may occur. If paint hardened (dried) in
sprayer, the pump packings and/or pressure transduc-
er must be replaced. See page 24 (pump) or 32 (pres-
sure transducer).
Basic Problem Solving
TYPE OF
PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column
Fluid Pressure
1. Check pressure transducer knob setting. The
pump won’t develop much pressure if it is at mini-
mum setting (fully counterclockwise).
1. Slowly increase pressure setting to see if
motor starts.
2. Check for a clogged spray tip or fluid filter, if used.
See page 11.
2. If tip is still clogged, relieve pressure;
refer to separate gun or tip instruction
manual for tip cleaning. Clean or replace
filter element. See manual 308–249.
Mechanical
1. Check for frozen or hardened paint in pump (20).
Using a screwdriver, carefully try to rotate fan at
back of motor by hand. See page 28.
1. Thaw. Plug in sprayer and turn on.
Slowly increase pressure setting to see if
motor starts. If it doesn’t, see NOTE
above.
2. Check pump connecting rod pin (17). It must be
completely pushed into connecting rod (15), and
retaining spring (18) must be firmly in connecting
rod groove. See Fig. 18, page 24.
2. Push pin into place and secure with
spring retainer.
3. Check for motor damage. Remove drive housing
assembly (11). See page 30. Try to rotate motor
fan by hand.
3. Replace motor (4) if fan won’t turn. See
page 28.
Electrical
1. Check electrical supply with volt meter. Meter
should read 105–125 VAC.
1. Reset building circuit breaker; replace
building fuse. Try another outlet.
2. Check extension cord for visible damage. Use a
voltmeter or test lamp at extension cord outlet to
check.
2. Replace extension cord.
3. Check sprayer power supply cord (50) for visible
damage such as broken insulation or wires.
3. Replace power supply cord. See page
29.
4. Check motor brushes for the following:
a. Loose terminal screws.
b. Broken or misaligned brush springs.
c. Brushes binding in holders.
d. Broken leads.
e. Worn brushes.
f. Brush leads snagged on spring clip.
NOTE:
The brushes do not wear at same
rate on both sides of motor. Check both
brushes.
4. Refer to page 23.
a. Tighten.
b. Replace broken spring and/or align
spring with brush
c. Clean brush holders. Remove carbon
with small cleaning brush. Align brush
leads with slot in brush holder to as-
sure free vertical brush movement.
d. Replace brushes
e. Replace brushes if less than 0.4”
(10 mm) long.
f. Correctly route the wires. See page 23.
5. Check motor armature commutator for burn spots,
gouges and extreme roughness. Remove motor
cover and brush inspection plates to check. See
page 23.
5. Remove motor and have motor shop
resurface commutator if possible. See
page 28.
6. Check motor armature for shorts using armature
tester (growler) or perform motor test. See page
22.
6. Replace motor. See page 28.
