PREVENTIVE MAINTENANCE
Risk of Injury. Equipment and fluid may be under pres-
sure. Pressure in the system must be relieved before
beginning the cleaning procedure and before replac-
ing any parts. Follow the procedures in the service
literature provided with the system.
Cleaning
1. Relieve air pressure from pressure feed tank.
Carefully follow instructions in the service bulletin sent
with tank.
2. Replace material in container with a suitable solvent.
3. Repressurize system.
4. Trigger gun and repeat procedure until gun and hose are
thoroughly clean. A SolventSaver™ type hose and gun
cleaner which supplies a mixture of air and solvent can be
used to most effectively clean gun and hose internal pas-
sages. See "Accessories" on back page. Wipe exterior of
gun with a solvent dampened cloth.
5. If a recirculating system is used, it may be necessary to fit a
shut off valve in return line to ensure fluid tip and forward
portion of sprayhead passage are properly cleaned when
flushed with solvent.
6. Refer to page 8 for optional gun annd hose cleaners.
Do not totally submerge gun in solvent. It is possible
to wash solids into air operating sections of gun which
could seriously damage piston o-ring seals.
The air cap can be immersed in solvent for cleaning. If
orifices are clogged, use a broom straw or toothpick
to remove obstruction. Never use a steel wire or hard
instrument. This will damage air cap and result in a
distorted spray pattern.
PARTS REPLACEMENT
Fluid needle (28) and Tip (3)
To prevent possible damage to the fluid tip (3) or needle
(28), always remove the adjustment knob (25) before
loosening or tightening the fluid tip.
To prevent possible damage to the spray gun, do NOT
loosen or tighten the fluid tip (3) if the fluid inlet (9) is
removed. The stainless steel insert may turn within
the gun body.
1. Relieve all air and fluid pressure in system.
2. Remove retaining ring (1) and air cap (2).
3. Remove fluid tip (3).
4. It is recommended that both the fluid tip (3) and needle
(28) be replaced at the same time. The needle packings (11)
should also be replaced when replacing the needle.
5. Remove baffle (5). It should be replaced if it is damaged or
filled with foreign material.
6. Remove adjusting knob (25).
7. Remove needle (28) with pliers.
8. Reassemble in reverse order.
Fluid Needle (28) and Fluid Needle Packings (11)
1. With sprayhead (8) and adjusting knob (25) removed, the
fluid needle (28) and packings (11) can be easily removed
and replaced. See step 4 above.
2. Slide onto the new needle (28), in this order, 1 packing (11),
spring (12) and 1 packing (11). Be sure to orient packings
(11) as shown. For Model AGX-552, slide brass collar piece
and seal (32) over needle.
3. Insert new needle into gun and slide packings and spring
over needle.
4. Assemble sprayhead (8) with retaining screws (7).
5. Tighten screws (7) with a 3/16 hexagon key 30-40 in. lbs.
until the body is flush with sprayhead assembly.
Piston (19) , O-Rings (17 & 18) and Seal (20)
1. Remove piston housing (29) by removing rear retaining
screws (7).
2. Remove fluid needle (28).
3. Remove springs (30, 31 & 27) and piston (19). Care must be
taken when removing piston (19). Use a locking long nose
pliers to extract piston by clamping on inner ring on back
of piston.
4. Remove air packing (20), o-rings (17 & 18).
5. Wipe clean bore of cylinder. Replace piston o-rings (17 &
18) and lightly lubricate with clean petroleum jelly. See
Lubrication section which follows.
6. To replace air packing (20) (inside of piston), slide packing
(20) over the needle (28) with ead-in chamfer towards the
fluid tip end of needle. Insert needle into the piston (19). Hold
piston in your hand so that tip end of needle is protruding
downward (protect needle from damage). Lightly tap blunt
end of needle to drive packing down into piston. The needle
will stop inside piston at a shoulder.
7. Fit complete assembly into gun.
8. Lubricate outside of springs (27) and (30) (see Lubrication
section), then re-install springs and piston housing (29) and
tighten down and torque mounting screws (7) 30-40 in. lbs.
9. Lubricate adjustment knob threads (25) after cleaning with
SSL-10 Gun Lube. Loosen locking nut (26) before screwing
the adjustment knob in.
If this No. on
Ref. No. (2)
Ref. No. (1 & 2)
Cap, Order
Air Cap Less
Air Cap with
Retaining Ring
Retaining Ring
24
AV-40-24
30
MB-4039-30
58
AV-439-58
62
MB-4039-62HD
64
MB-4039-64HD
704
AV-1239-704
765
AV-1239-765
777
31767-777
797
AV-1239-797
CHART 3 AIR CAPS
EN
SB-2-624-X (6/2017)
4 / 12
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