4
SPRAY GUN MAINTENANCE
WIRE AND BALL ASSEMBLY AND
CARBIDE SEAT REPLACEMENT
Refer to assembly drawing on page 6 to locate
numbered items.
1. Engage the safety assembly (35).
2. Shut off fluid pump and disconnect its air or power
supply.
3. Release pressure from the entire fluid system, from
the pump to the spray gun.
4. Remove nozzle guard assembly (1), air cap assembly
(2) and spray tip assembly (3). Unscrew seat retainer
(5) from fluid nozzle body (12) and remove seat (6),
small ring (8), seal gasket (9), large ring (10) and
loosen cartridge assembly (34). Unscrew material
valve control knob (29) and remove spring (28). Pull
back wire and ball assembly (11, 26, & 27) to prevent
bending during new seat and gasket installation.
Replace items 6, 8, 9 and 10 if necessary. Be sure the
taper in the carbide seat faces the wire and ball
assembly when reassembling. Screw seat retainer (5)
to fluid nozzle body (12) and tighten. Push wire
assembly (11), chuck lock (26) and wire chuck (27)
forward until it stops. Adjust wire chuck (27) for
1/16" trigger movement from air to fluid.
NOTE:
See pages 8 & 9 for proper trigger
adjustment.
Reassemble spring (28) and material valve control
knob (29). Finally, reassemble spray tip assembly (3),
air cap assembly (2) and nozzle guard assembly (1).
FLUID CARTRIDGE REPLACEMENT
Refer to assembly drawing on page 6 to locate
numbered items.
1. Engage the safety assembly (35).
2. Shut off fluid pump and disconnect its air or power
supply.
3. Release pressure from the entire fluid system, from
the pump to the spray gun.
4. Remove nozzle guard assembly (1), air cap (2) and
spray tip assembly (3). Remove seat retainer (5), car-
bide seat (6) and seal assembly (7). Remove material
valve control knob (29) and spring (28) from gun.
5. Loosen and remove wire chuck (27) and chuck lock
(26) from wire and ball assembly (11). Remove wire
and ball assembly from gun front.
6. Loosen ferulok nut (40) and slide over fluid tube.
Remove screw (43) and trigger guard assembly (42)
from gun. Loosen and remove trigger stud (15), trig-
ger screw (16) and trigger assembly (39) from gun
body. Remove fluid nozzle body (12) and head insert
(13) and slide fluid inlet (33) out of gun body.
7. Remove and replace cartridge assembly (34).
8. Reassemble fluid inlet (33) and head insert (13) to
gun body. Screw fluid nozzle body (12) to head insert
(13). Insert wire and ball assembly (11) into gun.
Reassemble items 10, 9, 8 and 6 into fluid nozzle
body (12). Screw on and tighten seat retainer (5) to
fluid nozzle body (12). Reassemble spray tip assem-
bly (3), air cap assembly (2), nozzle guard assembly
(1) and trigger assembly (39) to gun. Push wire and
ball assembly (11) forward. Screw on chuck lock (26)
and wire chuck (27) to wire and ball assembly (11).
After this has been done, pull back the wire chuck
(27) and adjust it on the wire & ball assembly (11)
for approximately 1/16" trigger movement from air
to fluid.
NOTE:
See pages 8 & 9 for proper trigger
adjustment.
Reassemble spring (28) and material valve control
knob (29). Reattach nut (40) along with ferrule (41)
and trigger guard assembly (42) to fluid inlet (33).
Assemble screw (43) to gun body plug (31). Torque
nut (40) to 20 ft. lbs.
SPINDLE ASSEMBLY O-RING REPLACEMENT
Refer to assembly drawing on page 6 to locate numbered
items.
1. Engage the safety assembly (35).
2. Shut off fluid pump and disconnect its air or power
supply.
3. Release pressure from the entire fluid system, from
the pump to the spray gun.
4. Remove material valve control knob (29) and spring
(28) from gun rear.
5. Loosen and remove wire chuck (27) and chuck lock
(26) from wire and ball assembly (11).
6. Remove housing (25) with a 5/16" Allen wrench and
slide spindle assembly (23) from gun body.
7. Lightly lubricate spindle assembly stem and replace
o-rings (20).
8. Reassemble in reverse order.
WARNING
If nut (40) is not torqued to recommended torque, under
high pressure requirements the fluid tube may disengage
from fluid inlet and cause serious injury.
!
CAUTION
Never use metal instruments to clean or scrape fluid or
air nozzles. These parts have been carefully machined and
altering their shape will cause faulty spray.
!
Содержание MACH 3SL
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