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307-735 15
PROBLEM CAUSE SOLUTION
Paint leaks into wet–cup
Throat packings are worn or damaged
Replace the packings. See page 16.
Excessive surging from spray gun
Spray tip or fluid filter is plugged
Disassemble and clean.
Spray tip too big or worn
Change the spray tip.
Paint too viscous
Thin the paint.
W
rong type hose
Use minimum 50 ft (15.2 m), static–free nylon
hose
(wire braid hose is unacceptable).
Not enough paint pressure
Pressure setting too low
Increase pressure.
Spray tip too big or worn
Change the spray tip.
Pressure control frozen
2
or damaged by
over–pressurization
3
Try
to thaw
, or replace pressure control.
Displacement pump worn or damaged
Replace the displacement pump. See page 16.
T
ails or fingers in spray pattern
Pressure setting too low
Increase pressure.
Fluid outlet filter is dirty or clogged
Clean
the filter
. See page 12 or manual
307–273.
Spray
tip too big or worn
Change the spray tip.
Fluid supply is low or empty
Refill
and prime the pump. See page 10. Check
fluid supply often to prevent running the pump
dry.
Paint too viscous
Thin the paint.
W
rong type hose
Use minimum 50 ft (15.2 m), static–free nylon
hose
(wire braid hose is unacceptable).
Paint runs or sags
Spray tip too big or worn
Change the spray tip.
Spitting from gun
Air in fluid pump or hose
Check
for loose connections at pump intake
and
tighten.
Then prime the pump. See page 10.
T
ip partially clogged
Clear the tip. See page 1
1.
Fluid supply is low or empty
Refill
and prime the pump. See page 10. Check
fluid supply often to prevent running the pump
dry.
Static
sparking from the gun
Spray
or work being sprayed is not prop
-
erly
grounded
Correct problem before continuing. Follow the
warning section, FIRE OR EXPLOSION HAZ-
ARD
on page 3.
1
The electric motor has an over–temperature switch
which automatically resets upon cooling. If it opens and
the
electric motor shuts itself of
f, unplug the power supply
cord
and let the sprayer cool for 30 to 60 minutes. Always
use
the lowest pressure setting needed when spraying.
2
Freezing
results from failure to replace the water–base
paint or flushing water with mineral spirits, and usually
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 shutof
f 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
.
DISPLACEMENT PUMP
To
reduce the risk of
serious bodily injury
, follow the
Pressure Relief Procedure Warning on page 14
before checking or repairing any part of the spray
system.
Unplug the sprayer!
WARNING
Removing the Pump.
See Fig 12.
1.
Flush the sprayer
. Relieve pressure.
2. Hold
the intake valve (222) steady with
a wrench and
unscrew
the adapter (38).
3.
Unscrew the hose (52).
4. Use a screwdriver to push the retaining spring (33)
aside,
and then push out the pin (34).
5. Loosen
the locknut (1
12) and unscrew the pump
(58).