Sherwin-Williams 820-001, Owner'S Manual

Page: 15 / 28

15
820-007
PROBLEM CAUSE SOLUTION
Electric motor runs but no output
or low output
(Also see PROBLEM, Not
enough paint pressure, on page
13) Piston ball check not seating
Piston packings worn or damaged
Intake valve ball check not seating
Displacement pump frozen or gear train
damaged
Pressure control frozen
2
or damaged by
overpressurization
3
Sprayer not primed
Service, see page 16.
Replace, see page 16.
Service, see page 16.
Thaw
2
, replace.
Thaw, change, remove or clean, re-
place, see page 21.
Prime, see page 11.
Electric motor labors when start-
ing; blowing fuses Capacitor failure
Circuit board failure
Replace capacitor, see page 18.
Replace circuit board, see page 21.
Paint leaks into wet-cup Throat packings worn or damaged Replace, see page 16.
Electric motor hums but will not
run Circuit board failure
Low voltage
Capacitor failure
Drive assembly damaged
Replace circuit board, see page 21.
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 19.
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 21.
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 21.
Service, see page 16.
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 usually causes perma-
nent 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 between the pump outlet and the spray gun, (4) from attaching a spray hose to the pressure
drain valve, or (5) from using a clogged or incorrectly assembled filter.