SB-2-511-A Page 3
PARTS REPLACEMENT
SRI-411 Packing Replacement Instructions
1. Remove adjusting knob and needle
spring from gun.
2. Partially withdraw needle from gun
body.
3. Loosen packing nut and remove.
4. Remove old packing.
5. Assemble packing nut to needle
6. Assemble packing in order shown to
needle.
7. Insert needle all the way into gun
body seating in tip.
8. Install needle spring and adjusting
knob.
9. Thread packing nut into gun body.
10. Tighten packing nut in equal
increments - no more than
1/6 turn at a time.
11. After each adjustment, pull needle
open and observe needle closure.
12. If needle snaps shut, continue
adjusting nut until there is evidence
of needle bind or slow closing.
13. Back off packing nut 1/12 turn or less
to the point where needle snaps shut.
Packing nut must remain tight enough
to prevent loosening by hand.
14. Pull needle several times to verify
needle snaps shut and check packing
nut for looseness.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to
clean cap holes, use a broom straw or tooth-
pick if possible. If a wire or hard instrument
is used, extreme care must be used to pre-
vent scratching or burring of the holes which
will cause a distorted spray pattern.
To clean fluid passages, remove excess
material from cup, then flush with a suitable
solvent. Wipe gun exterior with a solvent
dampened cloth. Never completely immerse
in solvent as this is detrimental to the lubri-
cants and packings.
NOTE
When replacing the fluid tip or
fluid needle, replace both at the
same time. Using worn parts can
cause fluid leakage. See Chart 1.
It is recommended that the fluid tip
seal (5) is replaced whenever the
fluid tip is removed. Also, replace
the needle packing at this time.
Lightly lubricate the threads of the
fluid tip before reassembling.
Torque to 6-7 ft-lbs. Do not over-
tighten the fluid tip.
To prevent damage to fluid tip (4)
or fluid needle (10), be sure to
either 1) pull the trigger and hold
while tightening or loosening the
fluid tip, or 2) remove fluid needle
adjusting screw (12) to relieve
spring pressure against needle
collar.
SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10* spray gun
lube at trigger bearing stud (19) and the
stem of air valve (15) where it enters air
valve assembly. The shank of fluid needle
(10) where it enters packing nut (9) should
also be oiled. Fluid needle packing (9)
should be lubricated periodically. Make sure
gun threads and retaining ring (2) threads
are clean and free of foreign matter. Before
assembling retaining ring to gun, clean the
threads thoroughly, then add two drops of
SSL-10 spray gun lube to threads. Fluid
needle spring (11) and air valve spring (14)
should be coated with a very light grease,
making sure that any excess grease will not
clog the air passages.
* Not for air tools or high RPM equipment.
For best results, lubricate the points indi-
cated, daily.
A. Trigger Points
B. Packing
C. Adjusting Knobs
D. Gun Threads
E. Air Valve Cartridge
CHART 1
No. on Air
Air Cap with Ret. Ring
Fluid Needle Used
Cap Order
➞
(Ref. No. 1)
With Fluid Tip
➞
Fluid Tip No.
Tip Size I.D.
in.
mm.
215
SRI-407-215
SRI-37
SRI-2-08-K*
.031
0.8
SRI-3
SRI-2-10-K*
.039
1.0
SRI-3
SRI-2-12-K*
.047
1.2
*Includes (1) SRI-6 fluid tip seal.
Packing Packing
Nut
Needle
Gun Body
A
B
C
E
D
A
