Service Bulletin
SB-2-226-B
Model MAX-504 ULTRA EFFICIENT
ERGONOMICALLY DESIGNED SPRAY GUN (Spray Pistol)
IMPORTANT: Before using this equipment,
read all safety precautions and instruc-
tions. Keep for future use.
TABLE OF CONTENTS
Page #
Description. . . . . . . . . . . . . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . 1
Safety Precautions. . . . . . . . . . . . . . . 2
Operation.. . . . . . . . . . . . . . . . . . . . . 4
Fluid Control Knob. . . . . . . . . . . . . 4
Horn Air Control Knob. . . . . . . . . . 4
Spray Pattern . . . . . . . . . . . . . . . . 4
Adjustments . . . . . . . . . . . . . . . . . 4
Cleaning . . . . . . . . . . . . . . . . . . . . . . 4
Periodic Maintenance . . . . . . . . . . . . 5
Lubrication Points . . . . . . . . . . . . . . . 5
Replacement of Parts . . .. . . . . . . . . . 5
Replacement Procedures . . . . . . . . 5
Air Cap. . . . . . . . . . . . . . . . . . . 5
Fluid Head and Needle. . . . . . . . 5
Gun Grips . . . . . . . . . . . . . . . . . 6
Air Valve Bushing, Seal, Piston,
and Air Seal . . . . . . . . . . . . . . 6
Horn Air Control Knob. . . . . . . . 1 0
Primary Trigger. . . . . . . . . . . . . 1 0
T-Block and Actuator. . . . . . . . . 1 0
Fluid Tube Assembly . . . . . . . . . 1 1
Air Fitting . . . . . . . . . . . . . . . . . 1 1
Air Cap Seal . . . . . . . . . . . . . . . 1 2
Fluid Head Retaining Ring. . . . . . 1 2
KK-5054 Gun Repair Kit . . . . . . . . . . 7
Spray Gun (spray pistol)
Exploded View . . . . . . . . . . . . . . . 8
Parts Listing . . . . . . . . . . . . . . . . . . . 9
Troubleshooting & Service Checks. . . 13
Warranty. . . . . . . . . . . . . . . . . . . . . . 1 5
Accessories. . . . . . . . . . . . . . . . . . . . 1 6
Worldwide Sales & Service. . . . . . . . . 1 6
Products shown here are covered by one or
more of the following U.S. Patent Nos.
5,236,129, 5,289,974, 5,330,108,
5,332,156, 5,332,159, D351,895,
D349,559, 5,395,094 & 5,711,485.
Foreign patents are issued or pending.
Figure 1
DESCRIPTION
Model: MAX-504
The patented MAX-504 spray gun is an
ultra efficient, ergonomically designed,
spray gun intended for professional use. It
uses low atomization pressure to spray
most general purpose coatings and is suited
for high production applications. The gun
is intended for use with a pressure feed
paint supply.
The MAX-504 weighs only 12 ounces
(340 g). The handle grip is contoured to fit
the palm. The primary trigger requires
less than 2 pounds (908 g) of force to
pull, and the pneumatic trigger less than
1 pound (454 g).
SPECIFICATIONS
Air Inlet:
1/4"
Fluid Inlet:
3/8"
Body:
Engineered Resins•
Wetted Parts:
Engineered Resins• & S.S.
Weight:
12 ounces (340 g)
Fluid Delivery:
Pressure Feed
Max. Fluid Temp.
40
°
C
P-1 - Maximum
Air Pressure:
100 PSI (7 bar)
P-2 - Maximum
Fluid Pressure:
150 PSI (10 bar)
Air Consumption at
22.5 CFM (46MP)
10 PSI Cap Press.
Trigger Force:
Primary
< 2 lbs. (908 g)
Pneumatic
< 1 lb. (454 g)
•A list of materials used in the construc-
tion of this equipment is available upon
request.
Figure 2
*H-3670 Ergoflex™ 3/8" flexible
air hose recommended (purchase sepa-
rately).
*Gun Air
Hose
"S" Clip
4 ft.
Gun Fluid
Tube
Note
Insure "S"
Clip is located
between fluid
connections
as shown.
Fluid
Hose
INSTALLATION
Attach air hose to 1/4" fitting at base of
gun handle. Use two wrenches to tighten.
Attach fluid hose to 3/8" fitting on end of 4
ft. fluid hose, using "S" clip as shown in
Figure 2.
A means of regulating both fluid and air
pressures must be provided so that op-
eration of the spray gun can be properly
controlled. Inlet air pressure (measured
at the gun) of approximately 65 PSI (4.4
bar) will result in approximately 10 PSI (.6
bar) at the air cap. Actual air cap pressure
should be measured with an air cap test
kit (see Accessories) to confirm 10 PSI
(.6 bar) or less to meet air quality regula-
tions.
1/4" Air Hose
Fitting
3/8" Fluid
Hose Fitting
Replaces SB-2-226-A