Spray Gun Lubrication - DeVilbiss TEKNA PROlite Technisches Bulletin

TB-1008-C
INSTALLATION
For maximum transfer efficiency, do not use more pressure
than is necessary to atomise the material being applied.
1. Connect the gun to a clean, moisture and oil free air
supply using a hose size of at least 8 mm (5/16") I.D.
hose. Do not use 6 mm I.D. hose (8 m x 6 mm hose at
510 LPM has a pressure loss of 1.8 bar. 8 m x 8 mm hose
at 510 LPM has a pressure loss of 0.6 bar. [Do not use
1/4" I.D. hose (25' x 1/4" hose at 18 CFM has a pressure
loss of 25 psi. 25' x 5/16" hose at 18 CFM has a
pressure loss of 8 psi).] Depending on hose length, larger
I.D. hose may be required.
When gun is triggered on, adjust inlet air pressure
(for recommended pressures see Chart 1 under Parts
Replacement) at the gun inlet. (Pressure gauge shown
under Accessories is recommended for this). Do not use
more pressure than is necessary to atomise the material
being applied. Excess pressure will create additional
overspray and reduce transfer efficiency.
If quick connects are required, use only high flow quick
connects approved for HVLP use. Other types will not flow
enough air for proper gun operation.
If an air adjusting valve is used at the gun inlet, use a
DeVilbiss air adjusting valve. Some competitive adjusting
valves have significant pressure drop that can adversely
affect spray performance. DeVilbiss air adjusting valves have
minimal pressure drop.
2. Attach the gravity feed cup to the material inlet.
Protective coating and rust inhibitors have been used
to keep the gun in good condition prior to shipment.
Before using the gun, flush it with solvents so that these
materials will be removed from fluid passages.
OPERATION
1. Mix coating material to manufacturer's instructions and
strain material.
2. Fill the cup with the required amount of material.
Fill to no more than 19 mm (3/4") from the top of the cup.
DO NOT OVERFILL.
3. Attach Cup Lid.
4. Turn fluid adjusting knob (28) clockwise to prevent fluid
needle movement.
5. Turn spreader valve adjusting knob (16) counter clockwise
to fully open.
6. Trigger gun on and adjust inlet air pressure (for
recommended figures see Chart 1 under Parts
Replacement) at the gun inlet. (Pressure gauge shown
under Accessories is recommended for this).
7 Turn fluid adjusting knob (16) counter clockwise until first
thread shows.
6
NOTE
NOTE
NOTE
NOTE
8. Test spray. If the finish is too dry, reduce airflow by reducing
air inlet pressure.
9. If finish is too wet, reduce fluid flow by turning fluid adjusting
knob (28) clockwise. If atomisation is too coarse, increase
inlet air pressure. If too fine, reduce inlet pressure.
10. The pattern size can be reduced by turning spreader valve
adjusting knob (16) clockwise.
11. Hold gun perpendicular to surface being sprayed. Arcing
or tilting may result in uneven coating.
12. The recommended spray distance is 150-200 mm (6"–8").
13. Spray edges first. Overlap each stroke a minimum of 75%.
Move gun at a constant speed.
14. Always turn off air supply and relieve pressure when gun is
not in use.
PREVENTIVE MAINTENANCE & CLEANING
To clean air cap and fluid nozzle, brush exterior with a stiff bristle
brush. If necessary to clean cap holes, use a broom straw or
toothpick if possible. If a wire or hard instrument is used, extreme
care must be used to prevent scratching or burring of the holes
which will cause a distorted spray pattern.
To clean fluid passages, remove excess material from cup, then
flush with a suitable solvent. Wipe gun exterior with a solvent
dampened cloth. Never completely immerse in solvent as this is
detrimental to the lubricants and packings.
When replacing the fluid nozzle or fluid needle, replace both at
the same time. Using worn parts can cause fluid leakage. See
page 11, Chart 2. Also, replace the needle packing at this
time. Lightly lubricate the threads of the fluid nozzle before
reassembling. Torque to 18–20 Nm (13–15 ft-lbs). Do not
over tighten the fluid nozzle.
To prevent damage to fluid nozzle (8) or fluid needle (24), be
sure to either 1) pull the trigger and hold while tightening or
loosening the fluid nozzle, or 2) remove fluid adjusting knob
(28) to relieve spring pressure against needle collar.

SPRAY GUN LUBRICATION

Daily, apply a drop of spray gun lubricant at trigger stud (40). The
shank of fluid needle (24) where it enters packing nut (36) should
also be oiled. Fluid needle packing (34) should be lubricated
periodically. Make sure spray head (9) and air cap retaining
ring (1) threads are clean and free of foreign matter. Before
assembling air cap retaining ring to spray head, clean the threads
thoroughly, then add two drops of spray gun
lubricant to threads. Fluid needle
spring (25) and air valve spring
(21) should be coated with a
very light grease, making sure
that any excess grease will not
clog the air passages.
Points of Lubrication
A. Trigger Points
B. Packing
C. Adjusting Knobs
D. Air Cap Retaining Ring Threads
NOTE
CAUTION
A
D
C
B