WAGNER Super Finish 21 Mode D'emploi page 39

Type of malfunction
Unit does not exert
suction
Unit exerts suction but
no build-up of pressure
takes place
Unit exerts pressure
and reaches pressure.
If the spray gun is re-
moved, the pressure
falls appreciably
Hard pressure jolts and
excessive vibration on
the spray gun and unit
Super Finish 21 • 23
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Possible cause
Inlet valve is clogged, cannot be pressed
down into inlet valve housing.
Inlet valve does not close as, for example,
the guidance is clogged
Outlet valve is clogged
Air in the hydraulic system
No tip in the spray gun
Tip too large
Suction filter clogged
Specially for unit with suction system:
Suction pipe not tight
Outlet valve parts worn
Relief valve does not close.
Coating material escapes from the return
pipe.
High-pressure hose for diaphragm unit not
suitable
Outlet valve parts worn
g g
Measure for elimination of malfunction
Switch off unit.
Inlet valve must allow movement; test by
pressing the inlet valve slightly with a soft
implement (e.g. a pencil). Moving the inlet
valve back and forth removes impurities
from the valve seat. If this does not help,
screw the inlet valve out of the paint section
and clean it, refer to page 38, point 11.1.
Screw inlet valve out of the paint section
and clean, see page 38, point 11.1.
Screw the outlet valve out of the paint sec-
tion and clean, see page 39, point 11.2.
Release air from unit (hydraulic system),
i.e. turn pressure regulating valve three
revolutions to the left. Allow the unit to run
one or two minutes.
After that, turn pressure regulating valve to
the right to set the desired operating pres-
sure.
Mount tip.
Selection of smaller tip, see page 47,
point 13.4.
Clean suction filter or replace.
Clean and tighten connection points.
Replace outlet valve parts, see page 39,
point 11.2.
Screw out relief valve from paint section
and clean or replace, see page 39, point
11.4.
Use original WAGNER high-pressure hose.
Replace outlet valve parts, see page 39,
point 11.2.
Remedy in case of disturbance
37