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FC9900 Plus
7
MAINTENANCE
Perform the following maintenance procedures
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to keep your HVLP spray gun working properly.
7.1
ADJUSTING THE PACKING NUT
If material leaks from around or through the packing nut (Fig.
13, item 1), readjust the packing nut.
1. Disconnect the air hose from the air inlet and remove the
cup assembly.
2. Pull the trigger all the way back and hold.
3. Tighten the packing nut (1) using a 8mm wrench until
the needle remains retracted inside the nozzle when you
release the trigger.
4. Loosen the packing nut slowly until the needle moves
freely back into position in the nozzle.
Once you have adjusted the nut, reconnect the
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air hose and the cup assembly. Squeeze the
trigger to see if the leaking has stopped. If it
has not, make sure the packing nut is as tight
as possible, while allowing the needle to move
freely. If adjusting the packing nut does not stop
the leak, replace the packing.
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7.2
REPLACING THE NEEDLE PACKING AND AIR
VALVE SEALS
Remove the needle packing only when replacing
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with a new needle packing. Do not remove the
needle packing for cleaning.
The needle packing and the air valve seals can
be replaced separately. If you are replacing only
one of them, use the appropriate steps from the
following procedures.
REMOVING THE NEEDLE AND HOUSING
1. Disconnect the air hose from the air inlet (Fig. 14, item 1).
2. Remove the material hose or cup assembly (2).
3. Remove the snap rings (3) from the trigger retaining pins
(4) and slide the pins out of the gun.
4. Remove the trigger (5).
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5
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5. Loosen the packing nut (Fig 15, item 1) using a 8mm
wrench.
6. Loosen the air flow valve nut (2) and remove the air flow
adjustment knob and the air flow valve nut (2) to allow
access to the material flow adjustment housing (3).
7. Loosen and remove the material flow adjustment housing
(3), needle (4), seal and spring (5) using a wrench.
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5
4
MAINTENANCE
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