11
308-799
Troubleshooting
WARNING
INJECTION HAZARD
T
o reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the
Pres-
sure Relief Procedure
on page 7.
MOTOR WON’T OPERATE
TYPE
OF PROBLEM
WHAT
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
Basic
Fluid Pressure Problems
1. Check
pressure control knob setting. The mo
-
tor will not run if it is at the minimum setting
(fully counterclockwise).
1. Slowly increase pressure setting to see if
motor starts.
2. Check
for a clogged spray tip or fluid filter
. Re
-
fer
to separate gun, tip, or fluid filter instruction
manual.
2. Relieve
pressure, refer to
separate gun, tip,
or fluid filter instruction
manual for cleaning.
Basic
Mechanical Problems
1.
Check for frozen or hardened paint in pump
(64).
Using a screwdriver
, carefully try to
rotate
fan
at back of motor by hand. See page 17.
1.
Thaw. Plug in sprayer and turn on. Slowly
increase pressure setting to see if motor
starts.
If it doesn’t, see NOTE 1, below
.
2. Check
displacement pump
connecting rod pin
(66). It must be completely pushed into con-
necting
rod (63) and retaining spring (68) must
be
firmly in groove
of connecting rod. See Fig.
25.
2. Push
pin into
place and secure with spring
retainer.
3. Check for motor damage. Remove drive
housing assembly (67). See page 25. T ry to
rotate
fan by hand.
3. Replace motor (73) if fan won’t turn. See
page
27.
Basic Electrical Problems
1. Check pressure control safety circuit. 2. Turn pressure control ON/OFF switch to
OFF to RESET. If pressure control safety
continues to trip, see ELECTRICAL
SHORT
on page 15.
2. Check
electrical supply with volt meter
. Meter
must
read 105–125 V
AC.
2. Reset building circuit breaker; replace
building
fuse. T
ry another outlet.
3. Check
extension cord for
damage. Check ex
-
tension
cord continuity with a volt meter
.
3.
Replace extension cord.
4. Check sprayer power supply cord (79) for
damage
such as broken insulation or wires.
4.
Replace
power supply cord. See page 19.
NOTE 1:
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
. If paint hardened (dried) in sprayer
, pump packings must be replaced.
See
page 29 (
Displacement Pump Repair
).
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