Startup
CAUTION
The wallet sized warning card provided with the gun
should be kept with the operator at all times. The card
contains important information on reducing the risk of
a fluid injection injury , and treatment information
should an injection injury occur. Additional copies of
this card are available at no cost.
CAUTION
Never start the electric motor with the inlet valve
removed, as it will severely damage the diaphragm.
NOTE:
If the sprayer has been started before, be sure
the pressure has been relieved or the sprayer will not
start.
1. Open the bypass valve (66) ONE turn
counter-
clockwise
. Do not place the pump intake in the pail
yet. See Fig. 3.
2. Turn the pressure control fully (4)
clockwise
to in-
crease pressure. See Fig. 3.
3. Remove the inlet strainer (27) and place your hand
over the inlet valve. Start the sprayer and confirm
that it is drawing a vacuum.
NOTE:
If the inlet valve (26) is not drawing a vacuum,
turn the sprayer OFF. Turn the sprayer over. Press down
on the stem (A) inside the inlet valve lightly with a small
screwdriver, and pour about a teaspoon of mineral spirits
or solvent into the valve. See Fig. 4. Release the valve
and turn the sprayer upright. With the pressure turned up,
turn on the sprayer. This should free any sticking parts in
the pump. Now check again for a vacuum. Shut of f the
sprayer and install the inlet strainer (27).
4. Place the adhesive pump assembly into a properly
prepared 5 gallon pail of adhesive.
5. Turn the sprayer ON and allow the adhesive to circu-
late through the bypass valve (4) for one or two min-
utes.
NOTE:
If the adhesive does not circulate back into the
pail, turn down the pressure and turn the motor on and
off several times to help prime the sprayer.
6. Turn the bypass valve (66)
clockwise
(finger tight)
to close it; this allows the pump to build up pressure.
7. Release the trigger safety lever. Trigger the gun onto
a piece of paper to check the spray pattern. The
spray pattern should be 12 to 18 inches wide with the
tip held 12 inches from the surface. Start at the low-
est pressure setting and then increase the pressure
until you get the recommended spray fan width. Too
much pressure creates an unacceptable “fogging”
pattern.
8. Whenever you stop spraying, always set the trigger
safety lever to prevent accidentally triggering the
gun.
9. Whenever you stop spraying for more than a mo-
ment, and when the sprayer is unattended, shut it off
and follow the
Pressure Relief Procedure
on page
2.
10. If the tip clogs, engage the trigger safety lever, shut
off and unplug the sprayer , and open the bypass
valve one turn
counterclockwise
. Disassemble the
tip in the reverse order of assembly (see manual
307–821). Thoroughly clean all parts in a warm,
soapy water and inspect for wear or damage. Re-
place parts as needed and reassemble. Be sure to
use a new seal and gasket when changing tips.
11. Important maintenance procedures are given on
pages 6 and 7.
Fig. 3
Fig. 4
0271
0272
27
66
4
1
3
4
2
Decrease pressure
(counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
1
3
4
2
22
26
A
