32
33
Spray Pattern Test
Spray pattern tests should be performed whenever:
•
the spray gun is taken into operation for the first time;
•
the spraying medium is changed;
•
the spray gun was taken apart for maintenance or repair works.
The spray pattern is best tested using a workpiece sample, a sheet of metal, card-
board or paper.
Spray Pattern Adjustment:
The spray pattern of the spray guns of model series PILOT Mini may be adjusted as
follows (look also at the figures of page 14 / 15).
a) Flat- or Round-Jet Adjustments
The spray-jet adjuster serves to change the spray pattern ratio from flat to round.
Flat-Jet Control (item 18):
•
LH-turn (outwards) = flat,
•
RH-turn (inwards) = round.
b) Material flow rate-Adjustments
The material flow is controlled across the needle adjusting screw (item 15).
LH-turn (outwards) = increase, RH-turn (inwards) = decrease.
c) Atomizing Air Adjustments
The atomizing air input is regulated across the air volume regulating control by
screwing (item 17) it inwards or outwards. The atomizing air pressure is to be set up
at the air pressure reducing valve of the compressor system - make sure to follow
relevant instructions and SAFETY warnings ! If any other changes of the spray pat-
tern those already described is desired, the spray gun has to be retooled. WALTHER
offers a wide range of combinations of air caps, material noozles and needles.
6
Retooling and Repairs
Warning
Atomizing air as well as the material input must be shut off prior to retooling - risk of
injury.
Note
Please refer to the exploded view at the beginning of these operating instructions to
perform the steps detailed below.
Changing of Material Nozzle and Air Cap:
1. Remove the air cap (item 1) from the gun body (item 4).
2. Remove the material nozzle (Iitem 2) from the gun body using the Size
„SW 7“ wrench.
Install the new material needle in reverse order.
Replacement of the Material Needle:
1. Remove the needle adjusting screw (item 15).
2. Remove the needle spring (item 14).
3. Remove the material needle (item 13) from the gun body.
Install the new material needle in reverse order.
Replacement of leaking Needle Seal Packing
1. Remove the material needle, nozzle and air cap.
2. Use a screwdriver to remove the needle packing gland (item 3.1) from the gun
body (It is recommended to use special tool instead of the screwdriver).
3. Remove the needle seal packing complete (item 3) {needle packing gland (item
3.1), needle seal packing (item 3.2), thrust ring (item 3.3)} from the gun body.
Use a thin wire, one end of which is bent into a hook, for this purpose.
Installation of the new needle seal packing in reverse order.
Note
Needle seal packings removed from the gun are not to be used again because their
sealing efficiency can no longer be relied upon.
Note
Apply a thin layer of grease when reinstalling or exchanging the following parts.
7
Cleaning
Attention
Never immerse the spray gun in solvent or any other cleaning solution. The functio-
nal reliability and efficiency of the gun can otherwise not be guaranteed.
Do not use any hard, sharp or pointed objects when cleaning the spray gun.
WALTHER is not responsible for any damage resulting from improper cleaning.
The gun does not need to be dismantled for cleaning.
1. Fill the cleaned material container / gravity-feed cup / syphon-feed cup / sus-
pended pressure-feed cup or the cleaned pressure tank with a cleaning fluid
compatible with the sprayed material.
2. Operate the spray gun.
3. Do not stop the spray gun until clear cleaning fluid emerges from the nozzle.
The entire system should then be depressurised until the gun is used again.
Clean the spray gun only with cleaning agents which have been recommended by
the manufacturer of the sprayed material and which do not contain the following
constituents:
•
halogenated hydrocarbons(e.g. 1,1,1-trichloroethane, methylene chloride, etc.)
•
acids and acidic cleaning fluids
•
regenerated solvents (so-called cleaning thinners)
