Sunex Tools SX70C User Manual [en, es, fr]

Operating Instructions • Warning Information • Parts Breakdown

Some dust created by power sanding,
sawing, grinding, drilling, and other
construction activities contains chemicals
known to cause cancer, birth defects or other
reproductive harm. Some examples of these
chemicals are:

• lead from lead-based paints,

• crystalline silica from bricks
and cement and other masonry
products, and

• arsenic and chromium from
chemically-treated lumber.

Your risk from these exposures varies,
depending on how often you do this type
of work. To reduce your exposure to these
chemicals: work in a well ventilated area,
and work with approved safety equipment,
such as those dust masks that are specially
designed to filter out microscopic particles.

SPECIFICATIONS

Fluid Orifice .................................................................................. 1.3mm

Air Inlet: .......................................................................................... 1/4" NPT

Rec. Max. Inlet Pressure ......................................................................60 PSI

CFM: .......................................................................................... 7.2 at 50 PSI

Nozzle Pressure ...................................................................................47 PSI

Cup Size .............................................................................................1000cc

ALWAYS READ INSTRUCTIONS
BEFORE USING POWER TOOLS

ALWAYS WEAR
SAFETY GOGGLES

WEAR HEARING
PROTECTION

AVOID PROLONGED
EXPOSURE TO VIBRATION

SX70C

Spray Gun

and Cup

SX70C: Parts Breakdown & Operating Manual 1 rev. 04/28/06

- FOLLOW THESE RULES FOR SAFE OPERATION!

• During cleaning and flushing, solvents can be
forcefully expelled from fluid and air passages.
Some solvents can cause eye injury.

• Be sure all in the area are wearing
impact-resistant eye and face protection.

• Even small projectiles can injure eyes and
cause blindness.

• Air under pressure can cause severe injury.
Always shut off air supply, drain hose of air
pressure and disconnect tool from air supply
when not in use, before changing accessories or
when making repairs. Never direct air at
yourself or anyone else. Whipping hoses can
cause serious injury. Always check for damaged
or loose hoses and fittings. Never use quick
change couplings at tool. They add weight and
could fail due to vibration. Instead, add a hose
whip and connect coupling between air supply
and hose whip, or between hose whip and
leader hose. Do not exceed maximum air inlet
pressure of 60 PSI.

• Always use tool a safe distance from other
people in work area.

• Maintain tools with care. Keep tools clean and
oiled for best and safest performance. Follow
instructions for lubricating and changing
accessories. Wiping or cleaning rags and other
flammable waste materials must be placed in a
tightly closed metal container and disposed of
later in the proper fashion.

• Do not wear loose or ill-fitting clothing; remove
watches and rings.

• Do not over reach. Keep proper footing and
balance at all times. Slipping, tripping and
falling can be a major cause of serious injury
or death. Be aware of excess hose left on the
walking or work surface.

• Do not force tool. It will do the job better and
safer at the rate for which it was designed.

• Do not abuse hoses or connectors. Never
carry tool by the hose or yank hose to
disconnect from air supply. Keep hoses from
heat, oil and sharp edges. Check hoses for weak
or worn condition before each use, making
certain that all connections are secure.

• High sound levels can cause permanent
hearing loss. Protect yourself from noise.
Noise levels vary with work surface.
Wear ear protection.

• When possible, secure work with clamps or
vise so both hands are free to operate tool.

• Repetitive work motions, awkward positions
and exposure to vibration can be harmful to
hands and arms.

• Avoid inhaling dust or handling debris from
work processes which can be harmful to your
health.

• Operators and maintenance personnel must be
physically able to handle the bulk, weight and
power of this tool.

• This tool is not intended for using in explosive
atmospheres and is not insulated for contact
with electric power sources.

• Solvent and coatings can be highly flammable or
combustible especially when sprayed. Adequate
exhaust must be provided to keep air free of
accumulations of flammable vapors.

• Smoking must never be allowed in the
spray area.

• Fire extinguishing equipment must be present in
the spray area.

• Never spray near sources of ignition such as pilot
lights, welders, etc.

• Halogenated hydrocarbon solvents — for
example, methylene chloride — are not
chemically compatible with the aluminum
that might be used in many system components.
The chemical reaction caused by these
solvents reacting with aluminum can become
violent and lead to an equipment explosion.
Guns with stainless steel fluid passages may
be used with these solvents. However,
aluminum is widely used in other spray
application equipment - such as material pumps,
cups and regulators, valves, etc. Check all other
equipment items before use and make sure they
can also be used safely with these solvents.
Read the label or data sheet for the material
you intend to spray. If in doubt as to whether or
not a coating or cleaning material is compatible,
contact your material supplier.

• Sprayed materials may be harmful if inhaled, or
if there is contact with the skin. Adequate
exhaust must be provided to keep the air free
of accumulations of toxic materials. Use a mask
or respirator whenever there is a chance of
inhaling sprayed materials. The mask must be
compatible with the material being sprayed and
its concentration.

SX70C: Parts Breakdown & Operating Manual 2 rev. 04/28/06

AIR SUPPLY

HVLP

HVLP

Pitch pipe back
toward air receiver

Air
Flow
CFM

10
20
30
40
50
70

Length of Pipe (ft.)

50 100 150 200

1/2"
3/4"
3/4"

1"
1"
1"

3/4"
3/4"
3/4"

1"
1"
1"

3/4"
3/4"

1"
1"
1"

1-1/4"

3/4"

1"
1"
1"

1-1/4"

Compressor Unit

Drain

Install drain at

each low point

Oil & Water

Extractor

25 Feet
or More

Oil and Water Extractor should be at least 25 ft.

from the compressor, farther if possible.

Drain

Never mount oil and water extractor on or near the air compressor.

During compression, air temperature is greatly increased. As the air cools down to room temperature, moisture condenses in the air line, on
its way to the spray gun. Therefore, always mount the oil and water extractor at a point in the air supply system where the compressed air
temperature is lowest.

Drain air lines properly.

Pitch all air lines back towards the compressor so that condensed moisture will flow back into the air receiver where it can be drained off. Each
low point in an air line acts as a water trap. Such points should be fitted with an easily accessible drain. See diagram above.

TYPES OF INSTALLATION

This spray gun is rugged in construction, and is built to yield exceptional value. The life of this product and the efficiency of its
operation depend upon a knowledge of its construction, use and maintenance.

Fluid Control Screw

SIPHON FEED CUP HOOKUP

Air pressure for atomization is regulated at extractor.
Amount of fluid is adjusted by fluid control screw on gun,
viscosity of paint, and air pressure.

Fluid
Siphon Cup

Air Inlet

Atomization
Pressure
Gauge

Air Hose

Fluid Control Screw

Oil and
Water
Extractor

PRESSURE FEED CUP HOOKUP

For fine finishing with limited spraying.

Oil and
Water
Extractor

Air pressure for atomization is regulated at
extractor; fluid pressure at cup regulator. For heavy
fluids and internal mix nozzle spraying, fluid adjusted by
control screw on gun.

Fluid
Siphon Cup

Air Inlet

Cup
Regulator

Atomization
Pressure
Gauge

Air Hose

SX70C: Parts Breakdown & Operating Manual 3 rev. 04/28/06

FOR BEST PERFORMANCE,

PLEASE BE SURE TO DO THE FOLLOWING

BEFORE USING THIS TOOL

• Tighten the gun to the cup securely with the nut and fitting supplied.

• Be sure to have the proper air pressure at the gun to operate. Proper air pressure for this tool should not exceed 50 PSI.

• Adjust fluid control screw and spray width adjustment screw to your desired pattern before using on production.

• Clean all parts after use.

ADJUSTMENTS

Trigger pivot

Spray width
adjustment screw

Fluid needle
packing & nut

Turn right for round,
left for fan.

SPRAYING

In normal use, the nozzle wings are
horizontal as shown here. This provides a
vertical fan-shaped pattern which gives
maximum, even material coverage as the gun
is moved back and forth parallel to the surface
being finished.

Fluid Control Screw
Turn right to decrease

flow, left to increase.

Air
Valve

Set inlet pressure at no more than 60 PSI. For optimum
performance, some materials may spray better at PSI ratings below
60 PSI. If unsure, always test at PSI ratings before using on final
production. Try spray. If it is too fine, decrease the air pressure or
open fluid control screw. If the spray is too thick, close the fluid
control screw. Regulate the pattern width and repeat adjustment of
spray as needed.

Spray pattern may be infinitely adjusted
from round to flat.

SX70C: Parts Breakdown & Operating Manual 4 rev. 04/28/06

OPERATION

Proper handling of the gun is essential for obtaining a good finish. The
gun should be held at a right angle to the surface being covered, and
moved parallel with it. For precise control of the gun and material, the
trigger should be released before the end of the stroke.

Hold the gun from 6 to 12 inches away from the surface depending

Even and wet coat

6 to 12 inches

Start

stroke

Pull
trigger

RIGHT

Release

trigger

End of
Stroke

on material and atomizing pressure. For a uniform finish, lap each
stroke over the preceding stroke, making sure the spray is smooth
and wet.

Using the lowest possible atomizing air pressure will reduce
overspray and provide maximum efficiency.

Light Coat Heavy Coat

WRONG

CLEANING AND MAINTENANCE

SPRAY GUN

1. Submerge the front end of the gun in solvent just until the
fluid connection is covered.

2. Paint that has built up on the gun should be removed using a
bristle brush and solvent.

3. Never submerge all of the spray gun in solvent because:

• This will dissolve the lubricant in the leather packings and

on wear surfaces, causing them to dry out and resulting in
difficult operation and faster wear.

• Air passages in the gun will become clogged with

dirty solvent.

4. Using a rag moistened with solvent, wipe down the outside of
the gun.

5. Oil gun daily. Use a drop of lightweight machine oil on:

A. fluid needle packing
B. air valve packing
C. trigger pivot point

See Fig. 1 for Location of Above Points.

6. NOTE: Do not soak rubber o-rings or seals in paint thinner.
O-rings and seals can be wiped clean with paint thinner
but soaking can cause these items to
deteriorate over time.

7. Caution: Do not use lubricants
which contain silicone. Silicone
may cause defects in the finish
application.

CAUTION

To avoid cross-threading, all spray gun parts should be screwed
in hand tight initially. If the parts can not easily be turned by
hand, be sure you have the correct parts, unscrew, realign, and
try again. NEVER use excessive force in matching parts.

AIR NOZZLE, FLUID NOZZLE, AIR VALVE ASSEMBLY

1. All nozzles and needles are made to exact standards. They should
be handled carefully.

2. To clean nozzles, immerse them in solvent until any dried
material is dissolved, then blow them clean.

3. Do not use metal or sharp instrument to probe any of the holes in
the nozzles.

4. Air flow should occur before fluid flow when the gun is triggered.
It may be necessary to adjust the fluid control screw to make sure
air flows before fluid.

5. Do not alter the gun in any way.

SIPHON CUP

Turn off air supply. Disconnect
cup from lid. Raise tube out of
material and pull trigger to allow
remaining material to drain
back to the cup. Empty the cup
of material. Clean the cup, lid
and tube. Add some thinner
to cup. Reassemble. Turn on
air supply and spray with
proper cleaning solvent.
Repeat with clean solvent
if necessary. Remove solvent,
disconnect gun, remove air cap
and clean. Wipe gun and cup
with rag dampened
with solvent.

C

A

B

Fig. 1

SX70C: Parts Breakdown & Operating Manual 5 rev. 04/28/06

TROUBLESHOOTING

CONDITION

Spitting

PROBLEMSPRAY PATTERN/

One side of nozzle wing is
clogged.

A.) Loose air nozzle.
B.) Material around outside of

air nozzle has dried.

A.) Atomization air pressure is set
too high.

B.) Trying to spray a thin material
in too wide a pattern.

A.) Packing around needle valve
is dried out.

B. Fluid nozzle loosely installed,
or dirt between nozzle
and body.

C.) Loose or defective swivel nut
on siphon cup.

SOLUTION

Soak nozzle in solvent to loosen clog, then blow air through
until clean. To clean orifices use a broom straw or toothpick.
Never try and detach dried material with sharp tool.

A.) Tighten air nozzle.
B.) Take off air nozzle and wipe off fluid tip,

using rag moistened with thinner.

A.) Reduce air pressure.
B.) Increase material control by turning fluid

control screw to left, while reducing spray
width by turning spray width adjustment
screw to right.

A.) Back up knurled nut, put a few drops of
machine oil on packing, re-tighten nut.

B.) Take off fluid nozzle, clean rear of nozzle and
seat in gun body. Replace nozzle and bring in
tight to body.

C.) Tighten or change out swivel nut.

Improper spray pattern.

Unable to get round spray.

Will not spray.

Fluid leakage from
packing nut.

Dripping from fluid tip.

A.) Gun improperly adjusted.
B.) Dirty air cap.
C.) Fluid tip obstructed.
D.) Sluggish needle.

Fan adjustment screw not
seating properly.

A.) No air pressure at gun.
B.) Fluid pressure too low with

internal mix cap and
pressure tank.

C.) Fluid control screw not
open enough.

D.) Fluid too heavy for
suction feed.

A.) Packing nut loose.
B.) Packing worn or dry.

A.) Dry packing.

B.) Sluggish needle.

C.) Tight packing nut.

D.) Worn fluid nozzle or needle.

A.) Readjust gun. Follow instructions carefully.

B.) Clean air cap.

C.) Clean.

D.) Lubricate.

Clean or replace.

A.) Check air supply and air lines.
B.) Increase fluid pressure at tank.
C.) Open fluid control screw.
D.) Thin material or change to pressure feed.

A.) Tighten, but not so tight as to grip needle.
B.) Replace packing or lubricate.

A.) Lubricate.
B.) Lubricate.
C.) Adjust.
D.) For pressure feed, replace with new fluid nozzle

and needle.

Thin, sandy coarse finish.

Thick, dimpled finish
resembling orange peel.

SX70C: Parts Breakdown & Operating Manual 6 rev. 04/28/06

A.) Gun held too far from surface.
B.) Atomization pressure set

too high.

Gun held too close to surface.

A.) Move gun closer to surface.
B.) Adjust atomization pressure.

Move gun further from surface.

SX70C PARTS BREAKDOWN & PARTS LIST

ITEM NO. PART NO. DESCRIPTION QTY.

1 RS70C01 Air Cap (1.3mm) 1
2 RS70C02 Fluid Nozzle (1.3mm) 1
3 RS70C03 Nozzle Seat 1
4 RS70C04 Two-Headed Screw 1
5 Gun Body 1
6
7
8 RS70C08 Air Valve Adjusting Packing Set 1
9 RS70C09 Needle Assy. (1.3mm) (incl.#10,11) 1
10
11
12
13 RS70C13 Spring Housing 1
14
15 RS70C15 Adjusting Screw 1
16

Only items identified by part numbers are available separately. Items marked with an asterisk (*) are available only in the repair kit, RS70CRK.

SX70C: Parts Breakdown & Operating Manual 7 rev. 04/28/06

Trigger Stud 1

*

Trigger Crossbolt 1

*

Needle Packing Set (included w/ #9)
Needle Adjusting Pole (included w/ #9)

Gasket 1

*

Needle Spring 1

*

Air Valve Stem 1

*

1

1

ITEM NO. PART NO. DESCRIPTION QTY.
17
18 RS70C18 Air Valve Screw Cap 1
19
20 RS70C20 Air Valve Screw I 1
21 RS70C21 Air Valve Screw II 1
22
23 RS70C23 Air Inlet Screw 1
24 RS70C24 Screw 1
25 RS70C25 Trigger 1
26
27 RS70C27 Needle Nut 1
28 RS70C28 Paint Cup Lid Assembly (incl.#29) 1
29 RS70C29 Paint Cup Gasket 1
30 RS70C30 Paint Cup 1

Air Valve Spring 1

*

Gasket 1

*

Air Valve Gasket 1

*

Airproof Ring 1

*