Check and/or Change the Hydraulic Oil
See Fig. 7.
1. Follow the
Pressure Relief Procedure
on page 2.
2. Remove the fill cap. The oil should be 1 inch (25 mm)
from the top of the plate. If it is lower, add oil as nec-
essary. use only Graco lightweight hydraulic oil, part
no. 218–797. Reinstall the fill cap, hand tight, if you
are not going to change the oil.
3. To change the oil, turn the sprayer over and drain the
oil through the fill cap hole.
CAUTION
Whenever you remove the fill cap, be very careful not
to let any dirt, adhesive particles, or other contami-
nants get into the hydraulic system. Contaminants
can cause damage to the hydraulic system.
4. Fill the hydraulic pump housing with 16.5 ounces (55
ml) of Graco lightweight hydraulic oil. Reinstall the fill
cap.
5. Plug in the sprayer . Turn the pressure control fully
counterclockwise
(no pressure). T
urn on the
sprayer and let it run for two minutes to fill the hydrau-
lic system. Increase the pressure to maximum and
turn the sprayer on and off four times to help rid the
hydraulic system of air.
Flushing Procedure
1. Shut off the sprayer. Lock the gun trigger safety le-
ver. Open the bypass valve ONE turn
counterclock-
wise
. Raise the fluid pump just above the adhesive
and turn on the sprayer to drain the adhesive. Now
turn off the sprayer. See Fig. 8.
2. Place the fluid pump in a grounded pail of solvent.
3. Check to be sure the trigger safety lever is locked.
Remove the spray tip from the gun. Unlock the safety
lever. Hold a metal part of the gun firmly to the side
of a grounded metal pail. Close the bypass valve.
Trigger the gun into the pail. T urn on the sprayer .
Watch the side of the pail for solvent to appear. Then
release the gun trigger. Turn off the sprayer.
4. With the bypass valve (66) closed, turn on the spray-
er, trigger the gun into the flushing pail and allow the
solvent to circulate through the hose and gun for two
to three minutes, using the lowest possible pressure.
See Fig. 8. Release the gun trigger and lock the safe-
ty lever. Turn off the sprayer.
5. Open the bypass valve (66) ONE turn
counter-
clockwise
.
6. Raise the fluid pump above the solvent, turn on the
sprayer, and allow the pump to run itself dry. Turn the
sprayer OFF.
7. Using a clean pail of water or solvent, and the lowest
possible pressure, flush again to be sure all adhesive
particles are removed.
8. Remove the fluid strainer and clean it thoroughly.
9. Now lubricate the inlet valve. See page 6.
Fig. 7
1 inch
(25 mm)
0269
5
Fig. 8
0275
0270
1
3
4
2
Decrease pressure
(counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
66
4
1
3
4
2
11
Fig. 9
0276
ÄÄ
ÄÄ
ÄÄ
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Maintain firm metal–
to–metal contact
between gun and con-
tainer
1
1
