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FC9900 Plus
7.3
REPLACING THE CHECK VALVE, VALVE SEAL,
AND AIR TUBES
The check valve is a one-way valve designed to allow air into the
cup, pressurizing the cup's contents. Because it is a one-way
valve, it prevents paint from seeping up the air tube into the air
passages of the gun. It also eliminates any delay in material flow
when the gun is triggered by maintaining pressure in the cup.
The check valve rotates open easily for cleaning. It contains
a valve seal that can be removed and cleaned with soap and
water for waterborne materials or a compatible solvent for
other materials. To replace the check valve, the valve seal, and/
or the air tubes:
1. Pull the lower air tube (Fig. 20, item 1) from the bottom of
the check valve (2).
2. Pull the check valve (2) from the upper air tube (3).
3. Unscrew the two halves of the check valve (2).
4. Remove the worn valve seal (4).
5. Clean the check valve body with a solvent appropriate to
the type of material being used.
Thoroughly clean the inside of the top half of the
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check valve but do not scratch it.
6. Insert a new valve seal (4), stem up, into the top of the
check valve as shown (2).
7. Tighten the two halves of the check valve together.
8. Insert the top of the check valve (2) into the upper air tube
(3).
Insert the check valve into the air tube so that the
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arrow on the valve points toward the gun.
G U
9. If the lower air tube (4) is too long, trim the tube so that it
fits the gun.
10. Push the lower air tube (1) onto the bottom of the check
valve (2).
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7.4
The cup gasket must be replaced periodically due to normal
wear. It is important to inspect the cup gasket during each
cleaning.
1. Release the cup locking lever (Fig. 21, item 1).
2. Hold the cup and twist the spray gun in the direction
indicated by the arrows on the bridge (2).
3. Lift the spray gun away from the cup.
4. Pull the worn cup gasket (3) out of the lid (4).
5. Press a new cup gasket (3) into the lid (4).
6. Place the spray gun onto the top of the cup.
7. Turn the spray gun opposite the direction indicated by the
arrows on the bridge until the pegs on the cup are in the
4
notches of the bridge (2).
8. Tighten the cup locking lever (1).
3
2
1
Make sure to attach the shorter air tube to the
gun fitting and the longer air tube to the cup lid
air nipple.
REPLACING THE CUP GASKET
2
3
DESCRIPTION OF UNIT
1
4
11
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