32
33
7 Repairs
Warning
Prior to any repairs: Make sure that the spray gun is in unpressurized condition, i.e.
all air and material inputs must be shut off - if not, imminent risk of injury.
Note
Please use the drawing (page 4) of these operating instructions to perform the follo-
wing procedures.
7.1
Changing the Needle Seal
1. Remove the air cap, the material nozzle and material as described under
5.5
.
2. Unscrew the packing screw (Item 4) from the housing.
3. Pull out the needle seal (Item 5) with an auxilliary tool. Use a strong wire on
which one end is bent making a small hook.
Installation takes place in reverse order.
Note
Never reinstall a used needle seal (Item 5) as otherwise the functional sealing relia-
bility of the spray gun will suffer.
7.2
Replacement of Nozzles, Needles, Springs and Seals
Dismantle the spray gun in accordance with Chapter
5.5 Changing of Material Nozzle
and Needle
, if the following components have to be replaced:
•
Material Nozzle
•
Piston Spring*
•
Material Needle*
•
Piston O-Ring*
Note
Parts marked with * must be lubricated with non-acidic, non-resinogenic grease prior
to installation.
8
Troubleshooting and Corrective Action
Warning
Prior to any servicing and repair work: Make sure that the spray gun is in unpressu-
rized condition, i.e. all air and material inputs must be shut off - if not, imminent risk
of injury.
Fault
Cause
Remedy
Gun is dripping
Material control nozzle
(Item 8) or needle (Item
3) fouled
Material control nozzle or
needle damaged
see
5.5
Removing Material
Nozzle or Needle and
cleaning
see
5.5
Replacing Material
Control Nozzle or Needle
Gun fails to open
Control air pressure too
low
Increaese control air pressure
to at least 4.5 bar
Material bubbling in
material container
Atomising air is entering
the material container via
the material channel.
Material nozzle (Item 3)
or air cap (Item 2) not
properly tightened.
Clean the parts, tighten or
replace.
Spray jet pulsating or
unsteady
Level in material tank too
low
Top-up material level (see
operating instructions of plant
systems manufacturer)
Spray fan one-sided
Air cap horn bore dirty
Remove and clean
Material leaks from
leakage boring
Needle seal packing
(Item 5) leaks
see
7.1 Changing the needle
seal
9
Disposal of Cleaning / Servicing Substances
Disposal of any such substances must be in accordance with all applicable local and
national regulations, directives and laws.
Warning
Pay special attention to all processing specifications and safety warnings issued by
the manufacturers of spraying and cleaning media. The improper disposal of any
toxic waste material represents a serious threat to the environment, i.e. to the health
of mankind and animal life.
