WALTHER PILOT WA 55, Operating Instruction, Page: 16 / 23

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7.4 Replacement of O-rings of the Flute-Piston
1. Unscrew the spring gland (item 23) from the piston body (item 21).
2. Pull back the flute-piston (item 18) from the piston body.
3. Change the six o-rings (item 20) of the flute-piston.
Installation takes place in reverse order.
Note
Never reinstall the used o-rings (item 20) as otherwise the functional sealing reliabi-
lity of the spray gun will suffer.
7.5 Replacement of Springs and Seals
Dismantle the spray gun in accordance with Chapter 7.1 and 7.2 , if the following
components have to be replaced:
• Material nozzle
• Material needle*
• Piston spring*
• O-ring of the piston*
• O-ring of the flute-piston*
• Flute-piston
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 nozzle or needle are fou-
led or damaged
Remove material nozzle or needle
and clean or replcace
see 7 Repairs
Gun fails to open
Control air pressure too
low
Increaese control air pressure to
at least 4.5 bar
Material bubbling
in material contai-
ner
Atomising air is entering the
material container via the materi-
al channel.
Material nozzle or air cap not pro-
perly tightened.
Clean the parts, tighten or
replace.
Spray jet pulsating
or unsteady
Level in material tank too low
Top-up material level (see opera-
ting instructions of plant systems
manufacturer)
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.
10 Specification Data
Weight: 232 g
Connections:
Atomising air M 3-4 mm ø
Control air (piston body) QSML-M5-4
Control air (housing) M 3-2 mm ø
Material supply QSM-1/8-6
Scavenger QSML-1/8-4
Pressure ranges:
Control air pressure min. 4.5 bar
Material pressure max. 6 bar
Atomizing air pressure max. 6 bar
Scavenger pressure max. 6 bar
max. Operating Temperature
of Spray gun 80 °C
Sound Level
(measured at a distance
of 1 m from the spray gun) 83 dB (A)
Air Consumption:
Atomizing air pressure Air consumption
1,0 bar 50 l/min
2,0 bar 60 l/min
3,0 bar 70 l/min
4,0 bar 85 l/min
5,0 bar 90 l/min
6,0 bar 100 l/min
Right to effect technical changes reserved.