Preventive Maintenance; Replacement Of Parts - DeVilbiss JGX-508 Series Operation Manual

PREVENTIVE MAINTENANCE

1. Daily lubrication and cleaning is necessary to maintain the best condition of the gun.
2. To clean the gun body, wipe exterior with solvent dampened cloth. Do not submerge the gun body in solvent as any
solids may get into the air passage and cause troubles.
3. Do not leave the gun with solvent in fluid cup. Clean the spray gun after used with clean solvent and empty the cup.
To clean the fluid cup, after removing extra paint, through the appropriate solvent and flush down the residual paint.
4. The Air Cap can be immersed in solvent and brushed down for cleaning. If orifices are clogged, use a toothpick to
remove obstruction. Never use a steel wire or hard instrument. This will damage air cap and result in a distorted
spray pattern.
5. Do not immerse any plastic parts in solvent for long time.
6. Certain portions of gun should be lubricated. Do not lubricate to any portion where not instructed. For lubrication,
SSL-10 Gun Lube* is recommended (*sold separately, vegetable not repelling materials).
7. The following portions should be lubricated regularly ; Trigger Bearing Stud (21), Pattern Valve (8), threads of cheater
Valve (23) and Adjusting Screw (13), Air Valve (16) stem, portion of Packing Gland (15) where Needle (11) comes in and
out.
8. When installing Air Cap (3), make sure no foreign materials adhered on Retaining Ring (1) and thread of Baffle and then
oil one drop of Gun Lube SSL-10.
9. Apply non-silicone grease lightly on Needle Spring (12) and Air Valve Spring (19). Do not apply too much grease as it
may clog the air passage.

REPLACEMENT OF PARTS

Before replacing gun parts, remove materials from the gun for cleaning. Then release the air pressure in the gun and
disconnect air hoses. All repairs should be made on a clean flat surface. Use only appropriate tools indicated for
replacement of parts.
Fluid Tip （4） and Needle （11）
1. It is recommended to replace Fluid Tip （4） and Needle （11） as a set.
2. Loosen completely Pattern Valve （8） by turning the knob counterclockwise.
3. Remove Adjusting Screw （13） and Needle Spring （12） and then withdraw Needle （11） from the gun body.
4. Remove Retaining Ring （1） and Air Cap （3）.
5. Remove Fluid Tip （4） by using socket wrench or offset wrench.
6. Recommended torque of Fluid tip (4) is 18N-22N・m.
Fluid Inlet （7） and Air Connector （23）
Fluid Inlet （7） and Air Connector （23） are fixed together with the adhesive. Use offset wrench for disassembling and
reassembling. When reassembling, apply the adhesive (Ex. Loctite 262) to threads of gun body.
Pattern Valve （8） and Cheater Valve （22）
When disassembling and reassembling Pattern Valve （ 8 ） and Cheater Valve （ 22 ） , turn the knobs completely
counterclockwise and then disassemble or reassemble them.
threads (Ex. 3 Bond 1401) and fix it.
Needle Packing （14）
1. Install Needle Packing （14） in the direction shown per drawing.
2. Adjust Needle Packing (14). Tighten the Packing Gland (15) gradually and then to adjust the needle moving smoothly,
loosen a little where the Needle (11) is not well pulled back.
When reassembling the valves, apply adhesive to the
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