26
27
5
Operation
The following requirements must be met before the spray gun is operated:
•
The atomizing air pressure must be available at the gun,
•
The material pressure must be available at the gun.
Caution
The material pressure should not exceed
•
8 bar,since otherwise the operational reliability of the spray gun will be impaired.
Warning
It is important to remember to relieve the spray gun of all pressures when work is
terminated. Lines left under pressure may burst and the released material may
cause injuries.
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,
cardboard or paper.
Spray Pattern Adjustment:
The spray pattern of the spray guns of Model Series PILOT Rapid may be adju-
sted as follows (look also at the figures of page 5).
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 25):
•
LH-turn (outwards) = flat,
•
RH-turn (inwards) = round.
b) Material flow rate-Adjustments
The material flow is controlled across the needle adjusting screw (item 14).
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
adjusting knob (item 20) 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 pattern those already described is desired, the spray gun
has to be re-tooled. WALTHER offers a wide range of combinations of air con-
trol heads, material noozles and needles.
6
Retooling and Repairs
Warning
Control and atomizing air as well as material inputs must be shut off prior to retoo-
ling - 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 Outlet Nozzle and Air Control Head:
1. Remove the air control head (item 1) from the gun body (item 4).
2. Remove the material outlet nozzle (Iitem 2) from the gun body using the Size
"SW 7" wrench.
Install the new material control needle in reverse order.
Replacement of the Material Control Needle:
1. Remove the needle adjusting screw (item 14).
2. Remove the needle spring (item 13).
3. Remove the material control needle (item 12) from the gun body.
Install the new material control needle in reverse order.
Replacement of leaking Needle Seal Packing
1. Remove the material control needle, outlet nozzle and air control.
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.
