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Speedaire Operating Instructions and Parts Manual
Models 35XR81
Introduction
The spray gun is a vital link in any
finishing application. In addition to
operating the spray gun properly,
techniques of surface preparation and
paint preparation must be understood.
These instructions will explain the
differences among various spray
technologies and serve as a guide in
the proper operation and techniques
of spray painting. Refer to the
Replacement Parts Manual for model
specific information.
Spray Gun Terms
FEED - Method used to bring material
into the gun for spraying.
PRESSURE FEED - Method of material
feed where a canister or paint tank is
pressurized to force material to the gun.
Either internal or external mix air caps
are used with this method. Pressure
feed is generally used for spraying
heavy bodied materials or for large size
projects.
SIPHON FEED - Method of material
feed where atmospheric pressure
creates a partial vacuum to siphon
material to the gun. Only external mix
air caps are used with this method.
Siphon feed is used with light bodied
materials.
GRAVITY FEED - Method of material
feed similar to the siphon feed method.
However, the cup is inverted to create a
positive fluid pressure at the nozzle.
MIX - The mixing of material and air
when spraying.
INTERNAL MIX - Process where the
air and material are mixed inside the
air cap just before being sprayed. This
method is best for heavy bodied, slow
drying materials and can only be used
with the pressure feed method. Do not
use fast drying materials with internal
mix. The material will dry inside and
quickly clog the air cap.
EXTERNAL MIX - Process where the air
and material are mixed just after leaving
the nozzle. This type of mix should be
used for fast drying materials and when
a high quality finish is needed.
BLEEDER / NON-BLEEDER - Indicates
whether air flows through the gun
continuously or as the trigger is pulled.
BLEEDER - In this mode, air passes
continuously through the gun whether
spraying or not. This mode is generally
used when the air is supplied by a
continuously running compressor that
does not have a tank.
NON-BLEEDER - In this mode, air flows
only when the trigger is pulled. This type
of operation is used with a compressor
equipped with a tank or with a large
factory air system. Do not use with a
continuous run compressor that does
not have a tank.
VISCOSITY - A measurement of the
resistance of the flow of a liquid.
ATOMIZATION - Conversion of liquid to
spray droplets (mist).
PATTERN CONTROL KNOB - Used to
form the proper pattern (size and shape)
of material as it is sprayed from the gun
to the work piece.
FLUID CONTROL KNOB - Used to
control the amount of material being
mixed with air.
PAINT TANK - An auxiliary pressurized
paint reservoir that allows continuous
spraying of large amounts of paint
without stopping for refills as with a
canister. It also allows using the spray
gun at any angle or orientation.
Model Description
MODELS 35XR81
• Switches easily from siphon to
pressure feed with the push of a
knob.
• Uses internal or external mix air caps.
3
• Has fluid control knob.
• Has pattern control knob.
• Adjusts for vertical or horizontal
patterns.
• May be used with a paint tank.
Set-Up
USE OF AIR CAPS
Internal Mix - Generally used
with slow drying, heavy
bodied materials and for
faster material application.
NOT to be used with fast
drying paints and lacquers which
will clog the opening in the air cap.
INTERNAL MIX CAPS MUST BE USED
WITH PRESSURE FEED operation.
External Mix - Used for quick
drying, light bodied materials
such as lacquers and synthetic
enamels. Better for finer
finish work. THESE CAPS
CAN BE USED WITH EITHER SIPHON OR
PRESSURE FEED.
FAN DIRECTION
The direction of the fan (horizontal or
vertical) can be changed by loosening
the lock ring and turning the air cap 90
degrees (See Figure 1). Hand tighten
lock ring after adjustment.
Air Cap
Horizontal Fan
Lock Ring
Figure 1
E
N
G
L
I
S
H
Vertical
Fan
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