13
TROUBLESHOOTING GUIDE
PROBLEM
CAUSE
SOLUTION
Electric motor hums but will not
run
Circuit board failure
Low voltage
Capacitor failure
Drive assembly damaged
Replace circuit board, see page 18.
Never use more than 200 ft. (61 m) of
12 gauge extension cord; use a long
fluid hose instead; check power supply
which should be 110 Volt minimum.
Replace capacitor.
Replace drive assembly; see page 16.
Excessive surge at spray gun
Spray tip is plugged
Spray tip is too big or worn
Pressure control frozen
2
or damaged by
overpressurization
3
Wrong type of hose
Paint too viscous
Remove and clean.
Change spray tip.
Thaw, change, remove or clean,
replace; see page 18.
Use minimum 50 ft. (15.2 m) static-free
nylon hose only (wire braid hose is un-
acceptable).
Thin.
Not enough paint pressure
Pressure setting too low
Spray tip too big or worn
Pressure control frozen
2
or damaged by
overpressurization
3
Worn pump parts
Increase.
Change spray tip.
Thaw, change, remove or clean,
replace; see page 18.
Service, see page 14.
Tails or fingers in spray pattern
Pressure setting too low
Outlet hose dirty or plugged
Spray tip too big or worn
Paint supply is low or pail is empty
Paint too viscous
Wrong type of hose
Increase.
Clean.
Change spray tip.
Fill and reprime.
Thin.
Use minimum 50 ft. (15.2 m) static-free
nylon hose only (wire braid hose is un-
acceptable).
Paint runs or sags
Spray tip too big or worn
Change spray tip.
Spitting from spray gun
Paint supply is low or pail is empty
Sprayer sucking air or gun needle not seating
Fill and reprime.
Tighten fittings, service gun.
Static sparking from spray gun
Sprayer or work is not grounded
Check conductivity of hose, electrical
outlet, ground, etc.
1
The electric motor has an over-temperature switch
which automatically resets upon cooling. If it opens and
the electric motor shuts itself off, unplug the power supply
cord and let the sprayer cool for 30 to 60 minutes. Always
use the lowest pressure setting needed when spraying.
Prevent overspray from restricting air passages; check
and clean often.
2
Freezing results from failure to replace the water-
base paint or flushing water with mineral spirits, and usu-
ally causes permanent damage to the pressure control.
3
Over-pressurization results from (1) using less than
50 ft. (15.2 m) of nylon spray hose, (2) from using a wire
braid spray hose, (3) from adding a shutoff device be-
tween the pump outlet and the spray gun, (4) from attach-
ing a spray hose to the pressure drain valve, or (5) from
using a clogged or incorrectly assembled filter.
