IMPORTANT: Before using this equip-
ment, read all safety precautions and
instructions. Retain for future use.
DESCRIPTION
Designated the HTE (High Transfer
Efficiency) Atomizing System, this new
process requires lower air volume resulting
in higher transfer efficiencies and
reduced over-spray. There are several
advantages to the atomizing process:
A.
HTE requires much lower fluid pres-
sures than air-assist airless, and a
pressure tank or diaphragm pump
can be used for fluid delivery.
B.
Atomization is excellent, producing a
low pressure, low velocity spray non-
injurious to operators.
C.
A conventional tapered needle is
employed. Since a tapered needle
is used, the spray gun can be “feath-
ered” by the operator in the same
manner as a conventional spray gun.
HTE provides a unique process of atomi-
zation.
A. An elongated “cat-eye” orifice in the
fluid tip produces a flattened fluid
stream that requires considerably less
air to atomize than the customary
cylindrical stream. This feature also
aids in forming a flat spray pattern.
B. Atomization occurs by mixing air with
the flattened fluid stream. A conical
fluid tip assembly causes the horn air
to be directed against the fluid stream.
C. Small air jets oriented around the air
nozzle horns break up the fluid (fingers)
at the edges of the pattern. In addition,
this feature aids in keeping the fluid tip
clean.
The MSHTE HVLP spray gun is a midsize,
lightweight spray gun. Fluid passages are
300 grade stainless steel. Fluid tips and
needles are 400 grade stainless.
OPERATING PRESSSURES
Air -
20 PSI Maximum
Fluid - 100 PSI Maximum
Note
This gun may be used with chlo-
rinated solvents; but, see Page 2
for additional warnings.
MSHTE HVLP SPRAY GUN
■
Model No. MSHTE-XXXX-X
■
Repair Kit (MSHTE) KK-5064
■
Soft Seal Kit (MSHTE) KK-5065
SERVICE BULLETIN
SB-2-293-C
Replaces SB-2-293-B
Note
The MSHTE HVLP spray gun is
not suitable for highly abrasive
materials (i.e. porcelain enamel,
certain mica paints, etc).
OPERATION
1. Since the fluid tip assembly has a rela-
tively small orifice, the material must
be free of large particles. Should these
particles be present it will be neces-
sary to strain the material.
2. Set the fluid pressure to 45-80 PSI.
Warning: Do not exceed 100 PSI.
Keep
fluid pressure as low as possible for
adequate spray.
3. Set the atomizing pressure to 5-10 PSI.
Keep air pressure as low as possible to
minimize bounce-back and over-spray.
4. The spray gun is now ready for
application.
5. Spray a sample product. Excessive fluid
flow will result in heavy center spray
patterns. In this case it will be neces-
sary to decrease the fluid pressure
or change to a smaller tip.
Insufficient flows may cause pattern
to split. In this case, it may be necessary
to increase the fluid pressure.
Do not
exceed 100 PSI.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exte-
rior with a stiff bristle brush. If necessary
to clean cap holes, use a broom straw or
toothpick.
Never use a wire or hard
instrument.
This may scratch or burr
holes causing a distorted spray pattern.
To clean fluid passages, remove excess
material at source, then flush with a suit-
able solvent using a device such as the
SolventSaver™ (see Accessories). Wipe
gun exterior with a solvent dampened
cloth. Never completely immerse in sol-
vent as this is detrimental to the lubri-
cants and packings.
FLUID INLET GASKET (6) REPLACEMENT
INSTRUCTIONS
1. Remove fluid inlet adapter with ap-
propriate wrench.
2. Clean loctite from gun body inlet
threads and seal area.
3. Place gasket (6) squarely onto fluid
inlet adapter and push down until it is
flat against the shoulder.
4. Place a couple of drops of thread seal-
ant (i.e. Loctite med. strength #242
blue or equal) on threads before in-
stalling fluid inlet adapter.
5. Torque fluid inlet adapter to 20-25 ft.
lbs. and tighten locknut.
To prevent damage to the fluid
nozzle assembly (3) or fluid
needle (26), be sure to either
1) pull the trigger and hold while
tightening or loosening the fluid
nozzle assembly or 2) remove
fluid needle adjusting screw (30)
to relieve spring pressure against
needle collar.
SPRAY GUN LUBRICATION
Daily, apply a drop of gun lube at trigger
bearing stud (20) and the stem of the air
valve (15) where it enters the air valve
assembly (18). The shank of the fluid
needle (26) where it enters the packing
nut (11) should also be oiled. The fluid
needle packing (10) should be lubricated
periodically.
Make sure baffle (5) and
retaining ring (1) threads are clean and
free of foreign matter. Before assem-
bling retaining ring to baffle, clean the
threads thoroughly, then add two drops
of •SSL-10 spray gun lube to threads.
The fluid needle spring (28) and air valve
spring (16) should be coated on the ends with
a very light grease, ensuring that any excess
grease will not clog the air passages. For best
results, lubricate the points indicated daily
using •SSL-10 spray gun lube.
A. Trigger points
B. Packing
C. Adjusting valve
D. Baffle & retaining ring threads
E. Air valve cartridge
• "Material Safety Data Sheet" available
from DeVilbiss upon request.
A
D
B
E
C
