Preventative Maintenance; Replacement Of Parts - DeVilbiss SRi Operation Manual

Gravity spray gun

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Operation manual (9 pages)

Table Of Contents

Table of Contents

1. Turn off air supply and relieve pressure in the airline or, if using QD system, disconnect from

airline.

2. Empty coating material into a suitable container and clean the gun and cup, preferably in a

gun wash machine.

3. IMPORTANT– the cup must not be cleaned or rubbed with a dry cloth or paper. It is

possible to generate a static charge by rubbing which, if discharged to an earthed

object, could create an incendive spark and cause solvent vapours to ignite. Only use

a dampened cloth or antistatic wipes if additional cleaning is required within a

hazardous area.

4. Remove air cap and clean. If any of the holes in the cap are blocked with coating material,

use a toothpick to clean. Never use metal wire which could damage the cap and produce

distorted spray patterns.

5. Ensure the tip of the nozzle is clean and free from damage. Build-up of dried paint can

distort the spray pattern.

6. Lubrication – stud/screw (12/13), needle (3) and air-valve (11) should be oiled each day.

Spanner (18) – The spanner is provided for removal of the nozzle (2) with the centre hex and

the adjustment of the needle packing (10) with the open end.

Air cap (1) – Unscrew air cap from the spray gun. Remove seal (20). Remove air cap from the

retaining ring (23). Clean air cap and ring. Re-assemble air cap to retaining ring (23). Fit new

seal (20) as in Fig A on exploded view, by lightly squeezing and inserting into the ring. Make

sure the seal is fitted the correct way round as in Fig B.

Nozzle (2) and needle (3) – Remove parts in the following order: (5), (4), (3), (1), (2) and (9).

Replace any worn or damaged parts and re-assemble in reverse order. It is recommended that

the separator (9) is replaced whenever the tip (2) is removed. Recommended tightening torque

for nozzle (2) 9 Nm (80 lbf in).

Packing (10) – Remove parts (5), (4), (3). Unscrew cartridge (10). Fit new cartridge finger tight.

Re-assemble parts (3), (4), and (5) and tighten cartridge (10) with spanner (18) sufficient to seal

but to allow free movement of needle. Lubricate with gun oil.

Air-valve (11) – Remove trigger (14). Remove body (25) and withdraw complete valve. Remove

rear bush, spring and stem assembly. Remove the air-valve cage from the valve body and

remove seal (22). Replace new seal (22), making sure the seal is correctly fitted with the lip

facing inwards. Remove old seal (8) from body if left in place. Place new seal (8) on the cage

before replacement of the valve assembly. Slide stem assembly (12) into the cage assembly, fit

the spring (21) on the valve head and fit collar. Fit complete assembly to gun body.

Spreader valve (6) – Caution: always ensure that the valve is in the fully open position by

turning screw fully counter-clockwise before fitting to body.

Refer to coating material manufacturers recommendations or ITW Finishing UK Website:

www.itweuropeanfinishing.com