Preventive Maintenance; Replacement Of Parts; Tip & Needle; Packing Seal - DeVilbiss Cobra 2 Operation Manual

Table of Contents

Advertisement

6.
If the finish is too wet, turn the ratchet knob (25) in clockwise to reduce the fluid flow, or reduce
the fluid pressure.
If the atomization is too coarse, increase inlet air pressure, or reduce fluid flow.
7.
The pattern size can be reduced by turning adjusting valve FAN
8.
The spray pattern will give the best results when perpendicular to the target.
9.
The recommended spray distance is 150-220 mm (6'' to 8'').
10.
Spray edges first. Overlap each stroke a minimum of 50%. Move gun at a constant speed.
11.
Always turn off air and fluid supply and relieve pressure and clean down when gun is not in us.

PREVENTIVE MAINTENANCE

Turn off air and coating supply and relieve pressure in the supply lines,
or disconnect from airline and fluid line.
1.
Unlock the spray gun from the base plate, remove it, and if available re-attach an alternative
gun. Now the spray gun maintenance can be done outside the spray booth while production is
still continuing.
2.
Remove air cap
use a toothpick to clean. Never use metal wire which could damage the cap and produce
distorted spray patterns
3.
Ensure the nozzle of the fluid tip
can distort the spray pattern.

REPLACEMENT OF PARTS

Turn off air and coating supply and relieve pressure in the supply lines, before any
maintenance operation.
Tip (2) & needle (18)
Remove the air cap (1) by unscrewing its retaining ring counter- clockwise, remove the index ring if
it remains on the gun head (if fitted and used).
Remove the tip (2) and its air separator ring (3) by unscrewing counter- clockwise with 10mm
hexagonal spanner.
Unscrew the adjusting needle knob (25) fully in counter-clockwise rotation, push the needle from
the front of the spay gun, carefully so to avoid damage the needle end, then pull out the needle
(18) from the back.
If necessary, replace the needle and the tip, first refitting the tip with its air separator ring
(recommended torque between 9,5 to 12 Nm).
Lubricate all the surface of the needle which will be in contact with the packing and o ring. Slide
the needle into the spray gun from the back.
Fit the needle spring with its plastic pad (22,23,24) and replace the needle adjusting knob (25).

Packing seal (9)

Unscrew the air cap (1), tip (2) and its air separator ring (3).
Unscrew the 4 screws (6) to disassemble the gun head (8).
Push back the packing seal (9) using a 5,5mm diameter rod from the front of the gun head. Clean
the packing location hole carefully with adequate solvent.
Fit a new packing seal (9) U face towards the fluid passage.
(1)
and clean. If any of the holes in the cap are blocked with coating material
(2)
is clean and free from damage. Any build up of dried paint
(13)
9
clockwise.

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents