Fan Air Valve Replacement - Graco 218-026 Instructions-Parts List Manual

Fan Air Valve Replacement

1. Place a wrench on the flats of the valve housing (33)
and remove it from the handle (2). See Fig 20.
2. Remove the retaining ring (31).
3. Rotate the air adjusting screw (34) counterclockwise
until it is disengaged from the valve housing threads.
Pull the adjusting screw (34) out of the valve hous-
ing (33).
4. Clean all the parts and inspect them for wear or dam-
age. If replacing the seal (40), unscrew it clockwise
and remove it from the adjusting screw.
5. Apply medium grade thread sealant to the small
threads on the end of the adjusting screw (34) and
install a new seal (left hand thread).
6. When reassembling the fan air valve, lubricate the o–
ring (32) and the adjusting screw threads with petro-
leum jelly.
7. After the retaining ring (31) is installed on the adjust-
ing screw (34), back the adjusting screw out of the
valve housing (33) until it bottoms out against the re-
taining ring (31).
8. Apply PTFE paste to the threads of the valve hous-
ing (33) and install it in the handle (2). Torque the
housing (33) to 1.1–1.4 N m (10–12 in–lb).
KEY
2 Gun Handle
31 Retaining Ring
32 O-Ring
33 Valve Housing
34 Adjusting Screw
40 Valve Seal
Fig 20
SERVICE
Air Valve Replacement
1. Using a screwdriver, remove the retainer (27), spring
(26), and air valve (25). See Fig 21.
Clean all parts in non–conductive solvent compat-
ible with the fluid being used, such as xylol or min-
eral spirits. Use of conductive solvents can cause
the gun to malfunction.
2. Remove the trigger by removing the screws and the
spacers from the gun.
3. Unscrew and remove the guide (24) and packing (47)
from the front of the gun handle (2).
4. Apply PTFE tape to the threads of the guide (24). In-
stall the new packing (47) and guide (24) in the front
of the gun handle (2). Tighten the guide (24) finger
tight only.
5. Install the new air valve (25) and spring (26) into the
back of the gun handle (2).
6. Apply PTFE tape to the threads of the retainer (27).
Install the retainer (27) in the back of the gun handle
(2) and tighten with a screwdriver.
7. Reinstall the trigger with the screws and spacers.
8. Squeeze the trigger and tighten the guide (24) just
until the valve (25) will not return when the trigger is
released. Then loosen the guide just enough so the
valve stem returns freely when the gun is triggered
and released.
KEY
2 Gun Handle
2
24 Guide
25 Air Valve Assembly
26 Spring
27 Retainer
47 Packing
40
31
32
34
33
Torque to
1.1–1.4 N m
(10–12 in–lb)
Fig 21
CAUTION
2
24
47
Apply
PTFE
tape
Apply
PTFE
tape
27
26
25