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Maintenance
Perform the following maintenance procedures to keep your
HVLP spray gun working properly. New parts can be obtained
by ordering the HVLP Gun Repair Kit, part number 0524187.
adjusting the Packing Nut
If material leaks from around or through the packing nut, 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 using a 3/8 inch wrench until the
needle remains retracted inside the nozzle when you
release the trigger.
Packing Nut
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 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.
Replacing the Needle
Packing and air valve Seals
NOTE: Remove the needle packing only when replacing
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.
a) Removing / Replacing the Packing
1. Separate the gun head from the gun rear (see instructions
on page 3). The needle will remain in the gun head.
2. With the two sections of the gun still separated, remove
the needle.
3. Remove the packing nut using a 3/8 inch wrench.
4. Remove the packing from the packing nut.
Gun head
Packing
Packing nut
NOTE: Make sure all of the old packing is removed
before installing the new packing.
5. Place the new packing into the packing hole.
6. Thread the packing nut one turn into the packing hole. Do
not tighten.
7. Replace needle into packing nut.
8. Tighten the packing nut securely using a 3/8 inch wrench,
then loosen the packing nut a quarter turn.
9. Reassemble the gun head into the gun body.
10. 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.
B) Removing the Needle and housing
1. Disconnect the air hose from the air inlet.
2. Separate the gun head from the gun rear (see instructions
on page 3). The needle will remain in the gun head.
3. Loosen the air flow valve nut and remove the air flow
adjustment knob and the air flow valve nut to allow access
to the material flow adjustment housing.
4. Loosen and remove the material flow adjustment housing,
seal, and spring using a wrench.
Material
Adjustment
Housing
Seal and
spring
Air flow
valve nut
5. Insert an 1/8 inch hex wrench into the back of the needle
guide shaft.
6. Hold the trigger bushing with a small pliers and turn the
1/8 inch hex wrench counterclockwise to remove the
retaining nut.
7. Pull the needle guide shaft out of the gun body. Do not
lose the trigger bushing.
Needle
guide shaft
Trigger
bushing
c) Replacing the air valve Seals
1. Remove the old rear air valve seal. It may stay on the
end of the needle guide shaft spring or in the material flow
adjustment housing.
2. Slide the new rear seal into the material adjustment
housing.
3. Remove the front seal retaining clip using a snap-ring
pliers.
4. Slide the old front air valve seal off of the needle guide
shaft.
5. Place the new front air valve seal on the needle guide
shaft with the beveled side facing the gun.
NOTE: Make sure that the new front air valve seal looks
like the one that was just removed.
SIDE VIEW
Front Air Valve Seal
Beveled Side
