Page 4 SB-2-226-B
Horn Air Control Knob
The horn air control knob is located on top
of the gun body, Figure 3. It rotates 90
°
from full on to full off. Within the 90
°
rotation, the fan pattern will change
from a round pattern to a full fan pattern.
To increase horn air flow and widen the
spray pattern, rotate the knob counter-
clockwise. To reduce the fan width or for
round spray, rotate clockwise.
Limit fan spray pattern to only as wide as
necessary. A wider spray pattern than
necessary can result in wasted paint.
Spray Pattern
The spray pattern can be changed from
a vertical fan to a horizontal fan by
loosening the air cap retaining ring and
rotating the air cap 90
°
, Figure 4.
Figure 4
Triggering Modes
Figure 5
For Primary Trigger Use -
rotate trigger
foreward approximately 20
°
and pull
downward.
For Pneumatic Trigger Use -
rotate trigger
forward approximatly 20
°
and push up-
ward. Note a minimum of approximately
6 psi air cap pressure is required for
pneumatic trigger function.
With the gun triggered on adjust the
regulated air supply to the gun to provide
the desired air pressure at the air cap.
Confirm air cap pressure with an air cap
test kit (see Accessories). Do not use more
pressure than is necessary to atomize the
material being applied. Adjust regulated
fluid pressure to deliver the desired paint
volume (refer to following note). Adjust
air pressure to provide a uniform disper-
sion of atomized paint throughout the
pattern. Excessive flow rates will result in
heavy center spray patterns. Inadequate
flows may cause the pattern to split. HVLP
requires that a gun distance of 6-8 inches
(150-200 mm) be used. Excess distance
will produce inferior results.
Note
With the "Maximum Performer"
spray head and air cap config-
uration, back pressure is created
against the fluid column. For
example, at 10 PSI (.7 bar) cap
pressure, there is approximately
2.5 PSI (.2 bar) back pressure
with the 46MP air cap. This will
reduce fluid output, and the
fluid regulator will require a
slight increase to offset the
back pressure.
Note
If local or national legislation
exists prohibiting the use of air
cap pressures greater than 10 PSI
(0.7 bar), the air cap test kit (see
Accessories) must be used to set
the air cap pressure.
Note
The spray gun should be cleaned
in accordance with local or na-
tional legislation applicable to
the industry sector in which the
equipment is being used.
CLEANING
Note
Use normal cleaning procedures
to clean the MAX-504 spray gun.
It should not be necessary to
remove the spray head or fluid
tube to clean the gun internally.
As with all spray guns, soaking
the gun is not recommended,
as this removes lubrication and
can affect performance.
Disconnect the fluid supply hose at the
fluid source and attach cleaning solvent
hose. A SolventSaver® hose and gun
cleaner is ideally suited to most effectively
clean all fluid passages (see Accessories
on Page 16).
To clean air cap, brush exterior with a
stiff bristle brush. If necessary to clean
air cap holes, use a broom straw or tooth-
pick. Never use a wire or hard implement;
this may scratch or burr holes, causing a
distorted pattern. If necessary, the air cap
assembly may be removed and soaked in
solvent. The fluid head can also be re-
moved and soaked in solvent if necessary.
See "Fluid Head (6) and Needle (12)"
under
REPLACEMENT OF PARTS
section.
Wipe the exterior of the gun with a damp
solvent rag to remove overspray. The
grips can be removed and soaked in
solvent if necessary. See "Gun Grips
(38 and 39)" in
REPLACEMENT OF PARTS
section.
OPERATION
The fluid control knob and orifice size of
the spray tip control the volume of fluid
flow. The horn air control knob (fan)
provides full pattern control, from a
round pattern to a full fan pattern.
Fluid Control Knob
Risk of eye injury. Always wear
eye protection and point the
spray gun in a safe direction
when adjusting the fluid con-
trol.
Do not turn the fluid control
knob out (counterclockwise)
more than 1-1/2 to 2 full turns,
enough to achieve full fluid
flow. If the fluid control is
turned out too far, the gun will
actuate and spray. This can
cause injury to the operator or
other personnel within range
of the gun outlet if the gun is
accidentally triggered.
The fluid control knob, Figure 3, is located
on the back of the gun handle. Turn it
counterclockwise (outward) to increase
fluid flow, and clockwise (inward) to de-
crease or shut off fluid flow. Full fluid flow
is achieved at about 1-1/2 to 2 turns out.
If you continue to turn the fluid control
knob past the full flow point, you will
hear and feel air bleed off from the hole
in the fluid control knob. This warning
feature, an air leak or hissing sound,
indicates the knob is turned outwards
too far. Turn the knob inward (clockwise)
until the air leak stops. If the fluid control
knob is turned outward too far, the gun
will engage and spray.
Figure 3
Vertical Fan
Horizontal Fan
Fluid
Control
Knob
Horn Air
Control Knob
Pneumatic
Trigger
Primary
Trigger
