WAGNER FINECOAT 9900 PLUS Mode D'emploi page 10

MAINTENANCE
8. Insert an 3mm hex wrench into the back of the needle
guide shaft (Fig 16, item 1).
9. Hold the retaining nut (2) with a wrench and turn the 3mm
hex wrench counterclockwise to remove the retaining nut.
10. Pull the needle guide shaft (1) out of the gun body.
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REPLACING THE AIR VALVE SEALS
1. Remove the old rear air valve seal (Fig 17, item 1). It may
stay on the end of the needle guide shaft spring (2) or in
the material flow adjustment housing (3).
2. Slide the new rear seal (1) into the material adjustment
housing (3).
3. Remove the front seal retaining clip (4) using a snap-ring
pliers.
4. Slide the old front air valve seal (5) off of the needle guide
shaft (6).
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5. Place the new front air valve seal on the needle guide shaft
with the beveled side (Fig. 18, item 1) facing the gun.
Make sure that the new front air valve seal looks
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like the one that was just removed.
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6. Snap the front seal retaining clip (Fig. 17, item 4) onto the
needle guide shaft (6).
REMOVING THE PACKING
1. Remove the packing nut (Fig. 19, item 1) using a 8mm inch
wrench.
2. Insert a long, narrow-bladed flathead screwdriver through
the back of the gun and into the packing hole (2).
3. Press the screwdriver firmly into the packing and turn
counterclockwise. This should back the old packing out
of the threaded hole. If it does not, push the screwdriver
more firmly into the packing and try again. If this still does
not remove the packing, use a pick tool to pull the packing
out.
Make sure all of the old packing is removed
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before installing the new packing.
INSTALLING THE NEW PACKING AND REASSEMBLING
THE GUN
1. Place the new packing into the packing hole.
2. Thread the packing nut one turn into the packing hole. Do
not tighten.
3. Push the needle guide shaft through the back of the gun
body and thread on the retaining nut.
4. Grasp the material flow adjustment housing with the
needle attached. Slide the needle with the spring and the
rear air valve seal through the needle guide shaft and into
the packing nut. Tighten the material flow adjustment
housing securely using a wrench.
5. Tighten the packing nut securely using a 8mm wrench,
then loosen the packing nut a quarter turn.
6. Thread the air flow valve nut and air flow adjustment knob
into the gun body and tighten into position.
7. Assemble the trigger by inserting the retaining pin or pins
and attaching the snap rings.
8. Pull the trigger to make certain the needle moves freely.
If the needle sticks, loosen the packing nut. If the packing
leaks, tighten the packing nut.
FC9900 Plus
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