6.3
Cleaning Routine
The spray gun does not have to be necessarily dismantled for cleaning if and when
the paint is changed in regular intervals or upon termination of work (depending, of
course, an the material used).
The following requirements must be met before the routine cleaning work can be per-
formed:
1. The cleaned gravity-feed cup has to be filled with a cleaning solution compatible
with the sprayed material.
2. Take the spray gun into operation (see 5.2 Starting / Stopping Requirements).
3. Do not stop the spray gun until clear cleaning solution emerges from the nozzle.
All pressures should be removed from the complete spraying system until it is taken
into operation again.
7
Repairs / Replacements
Warning
Prior to any repairs /r eplacements: 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 inju-
ry.
Note
Please use the exploded view at the beginning of these operating instructions in
order to perform the following procedures.
7.1
Replacement of defective Needle Seal Packing
1. Remove the material control needle (see 5.5 Retooling of Spray Gun).
2. Remove the needle packing gland (Item 4) from the gun body.
3. Remove the needle seal packing (Item 5).
Assembly is performed in reverse order.
Note
Never reinstall a used needle seal packing, as otherwise the functional sealing relia-
bility of the spray gun will suffer.
7.2
Replacement of Material Control Nozzle and Needle
Disassemble the spray gun according to 5.5 Retooling the Spray Gun.
Note
All sliding and moveable parts must be lubricated with a non-acidic, non-resinogenic
grease prior to installation.
10
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Repair Kit:
A WALTER PILOT repair kit is available for the manual spray gun PILOT IV
which comprises all wearing parts:
Repair Kit Art. No.: V 16 004 02 . . 1
Consisting of: air cap (Item 2), material nozzle (Item 3), needle seal packing (Item
5), material control needle (Item 9), needle retaining nut (Item 10), needle spring
(Item 12), valve spring (Item 17), valve cone (Item 18) and packing (Item 22).
8
Troubleshooting and Corrective Action
Warning
Prior to any servicing and repair work: Make sure that the spray gun is in unpres-
surized condition, i.e. the air input must be shut off - if not, imminent risk of injury.
11
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Fault
Cause
Corrective Action
Gun is dripping
Material needle or nozzle fou-
led
Material needle or nozzle
damaged
Needle packing gland (Item 4)
too tight
Needle spring (Item 11)
defective, possibly broken
Size mismatch between mate-
rial needle and nozzle
Adjusting screw (Item 14) tur-
ned too far to the back
Clean - see 5.5 Retooling the
Spray Gun
Replace - see 5.5 Retooling the
Spray Gun
Loosen slightly
Remove material needle and
nee dle spring - see 5.5 ...
Use same diameters
Screw in adjusting screw slightly
(turn clockwise)
Spray jet pulsa-
ting or unsteady
Level in gravity-feed too low
Gravity-feed cup is tilted too
much during spraying opera-
tion
Material nozzle is loose or
damaged
Top-up material level
Keep straight
Tighten
Materialleckage
from Packing
Gland
Packing gland too loose
Needle seal packing (Item 5)
damaged
Tighten
Replace
Gun keeps blo-
wing in off con-
dition
Valve cone (Item 18) damaged
or
Valve shank (Item 19) binds
Replace
Loosen
Spray jet one-
side
Horn bores fouled
Clean air cap
