SUCTION FEED SPRAY GUNS
1.7, 2.0, 2.5MM SET UP
MODEL NO: S717, S720, S725
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these instructions,
and properly maintained, give you years of trouble free performance.
1. SAFETY
9 Familiarise yourself with the application, limitations and potential hazards peculiar to the spray gun.
WARNING! Disconnect the spray gun from the air supply before changing accessories, servicing or performing any maintenance.
9 Maintain the spray gun in good condition (use an authorised service agent).
9 Replace or repair damaged parts. Use authorised parts only. Unauthorised parts may be dangerous and will invalidate the warranty.
9 Keep the spray gun clean for best and safest performance.
9 Ensure that the compressed air system can supply the spray gun air consumption.
9 Wear approved safety respiratory protection and safety eye goggles.
9 If spraying isocynate based finisher, wear approved respirator/clean air breathing apparatus and cover exposed skin with latex gloves and
an impervious hooded coverall.
9 Remove ill-fitting clothing. Remove ties, watches, rings and other loose jewellery and tie back long hair.
9 Locate the spray gun in a suitable work area. Keep area clean and tidy and free from unrelated materials and ensure that there is adequate
ventilation and lighting.
9 Keep children and unauthorised persons away from the work area.
9 When not in use, ensure that the air supply is turned off.
9 Avoid unintentional operation of spray gun.
9 The spray gun has been treated with an anti-corrosive agent at the factory and MUST be flushed out thoroughly with thinners before use.
8 DO NOT point spray gun at yourself, other persons or animals.
8 DO NOT direct air from the air hose at yourself, other persons or animals.
8 DO NOT carry the spray gun by the hose, or yank the hose from the air supply.
8 DO NOT exceed the maximum air pressure of 70psi.
8 DO NOT use the spray gun for any purpose other than that for which it is designed.
8 DO NOT allow untrained persons to operate the spray gun.
8 DO NOT get the spray gun wet or use in damp or wet locations or in areas where there is condensation.
8 DO NOT operate the spray gun if any parts are missing or damaged as this may cause failure and/or personal injury.
9 When not in use, disconnect the spray gun from the air supply, clean thoroughly and store safely.
2. INTRODUCTION
Suction feed spray guns, ideal for automotive refinishing. 2-Stage trigger control. Adjustable spray width and fluid flow. Maintenance tools
supplied. Available in three standard set-up sizes; 1.7, 2 and 2.5mm, each finished in a different colour for easy identification. Supplied
with 1000ml aluminium cup.
3. SPECIFICATION
MODEL NO. S717 S720 S725
Air Consumption 3-4cfm 3-4cfm 3-4cfm
Available Set-Up(s): 2, 2.5mm 1.7, 2.5mm 1.7, 2mm
Pot Capacity: 1000ml 1000ml 1000ml
Recommended Air Pressure: 57psi 57psi 57psi
Standard Set-Up: 1.7mm 2mm 2.5mm
4. AIR SUPPLY
4.1. For recommended hook-up, see fig.1. Ensure the air valve is in the “o” position before connecting to the air supply.
4.2. You will require an air supply capable of providing a pressure 60psi and an air volume of 11cfm to operate the gun.
WARNING! Ensure the air supply is clean and is regulated to a maximum of 60psi. Too high an air pressure and unclean air will
shorten the life of the gun due to excessive wear and may be dangerous, causing damage and/or personal injury.
4.3. Drain the air supply tank and pressure regulator daily. Water in the air line will damage the gun and contaminate the paint.
4.4. Clean the compressor air inlet filter weekly.
4.5. Line pressure should be increased to compensate for unusually long air hoses (over 8 metres). The minimum hose diameter should be
10mm (3/8”) I.D. and fittings must have the same inside dimensions.
4.6. Keep hose away from heat, oil and sharp edges. Check hoses for wear, and make certain that all connections are secure.
Refer to
instruction
manual
Wear eye
protection
Wear protective
gloves
Wear respiratory
protection when
spraying isocynate
Wear face
mask
Wear protective
clothing
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE
THE PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR
PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
Original Language Version
© Jack Sealey Limited
S717, S720, S725 Issue 2 (H,F) 25/09/23
4.7. COUPLINGS
Vibration may cause failure if a quick change coupling is connected directly to the spray gun. To overcome this, connect a leader hose to
the spray gun. A quick change coupling may then be used to connect the leader hose to the air line recoil hose (figs.1 and 2).
FIG.1 FIG.2
5. OPERATION
5.1. Ensure that you have read and understood the Safety Instructions in Section 1.
5.2. For best results the gun must be handled and operated correctly. It should be held perpendicular to the surface being sprayed and moved
parallel to it. Start the stroke before squeezing the trigger and release the trigger before finishing the stroke. This will enable you to
accurately control the gun and paint, fig. 3.
5.3. Spray from a distance of about 150 (6”) to 250mm (10”) depending on the material and the atomizing pressure. The paint deposited
should always be even and wet. Each stroke must overlap the preceding stroke to obtain a uniform finish. To reduce over-spray and obtain
maximum efficiency, spray with the lowest effective atomizing air pressure.
5.4. Controlling the fan spray and the paint:
a) Use the paint control knob, fig.4.A to increase or decrease the paint flow.
b) Fig. 4.B is the air input control and should be set to the lowest effective flow.
c) Turn the air cup, fig.5.1 to achieve a horizontal or vertical fan spray. Lock the cup with retaining ring, fig.5.2.
d) In normal operation, the wings on the cup are horizontal as fig.5. This provides a vertical fan-shaped pattern, fig.6 which gives the
optimum coverage when moving the gun back and forth, parallel to the work surface.
e) The spray pattern is variable from round to flat with patterns in between, controlled by the pattern knob, fig.4.C.
FIG.3 FIG.4
FIG.5
FIG.6
6. CLEANING
IMPORTANT: ENSURE THE GUN IS CLEANED AFTER EACH USE.
6.1. Disconnect from the air supply before attempting any cleaning, other than flushing, or maintenance.
6.2. CLEANING THE GUN
6.2.1. Clean out pot with clean solvent.
6.2.2. Flush the gun thoroughly with solvent and clean the nozzle with solvent and a brush. DO NOT immerse/soak the nozzle in solvent.
8 DO NOT immerse the entire gun in solvent. This will cause lubricants to dissolve and packing to dissolve or dry out.
6.2.3. Wipe the outside of the gun with a solvent-dampened rag.
6.2.4. If you need to clear blocked orifices, only use a non metallic probe that is softer than brass.
7. MAINTENANCE
7.2.1. Lubricate the gun daily with a light machine oil. Be sure to lubricate the fluid needle packing, air valve packing and trigger pivot point.
If you change the nozzle size, ensure the complete nozzle set is exchanged. Insert paint nozzle before putting the paint needle in.
NOTE: Take care when re-assembling. Screw parts hand tight to avoid cross-threading. If a part cannot easily be turned by hand, check
that you have the correct part, or unscrew, realign and try again. DO NOT use excessive force when re-assembling.
Original Language Version
© Jack Sealey Limited
S717, S720, S725 Issue 2 (H,F) 25/09/23
8. TROUBLESHOOTING
8.1. A faulty spray is usually caused by improper cleaning or dried material around the fluid nozzle tip or in the air cup - use a brush and
solvent to remove. Never use metal instruments to clean the air cup or paint nozzle. These parts are carefully machined and any damage
to them will cause a faulty spray. If either the air cup or paint nozzle is damaged, the part must be replaced before a perfect spray can be
obtained.
PROBLEM POSSIBLE CAUSE SOLUTION
Dried material in a dirty side port restricts
passage of air. Greater flow of air from the
cleaner side port forces the fan pattern in the
direction of the clogged side.
Dissolve material in the side ports with
solvent, then blow the gun clean.
Do not poke the orifice with a metal
instrument.
Dried material around the outside of the fluid
nozzle tip restricts the passage of atomizing
air at one point through the centre opening of
the air cup and results in the pattern shown.
This pattern can also be caused by a loose
air cup.
Remove the air cup and wipe off fluid tip
using a rag dampened with solvent.
Tighten the air cup.
A split spray or one that is heavy at each end
of the fan pattern and weak in the middle is
usually caused by too high an atomization air
pressure or by attempting to get too wide a
spray with thin paint.
Check supply pressure and reduce if over
50psi.
Adjust the air atomisation valve to reduce
pressure and adjust paint needle if required.
Check spray pattern on a test panel.
Worn needle packing permits air to get into
the fluid passageway. This results in spitting.
Dirt between the paint nozzle seat and
body or a loose paint nozzle will cause the
gun to spit.
A loose or defective joint between the pot
and gun can cause spitting.
Tighten the packing screw or, in severe
cases, replace the packing.
Remove the fluid nozzle, clean the back of
the nozzle and the nozzle seat in the gun
body using a rag dampened with solvent.
Tighten or replace.
Sealey Group, Kempson Way, Suffolk Business Park, Bury St Edmunds, Suffolk. IP32 7AR
01284 757500 sales@sealey.co.uk www.sealey.co.uk
Note: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
Important: No Liability is accepted for incorrect use of this product.
Warranty: Guarantee is 12 months from purchase date, proof of which is required for any claim.
Original Language Version
© Jack Sealey Limited
Parts support is available for these products. Please email sales@sealey.co.uk or telephone 01284 757500
S717, S720, S725 Issue 2 (H,F) 25/09/23
ENVIRONMENT PROTECTION
Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be
sorted, taken to a recycling centre and disposed of in a manner which is compatible with the environment. When
the product becomes completely unserviceable and requires disposal, drain any uids (if applicable) into approved
containers and dispose of the product and uids according to local regulations.
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