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12 Cleaning
c.
c'.
g.
1.
3.
Design change from January 2012
78
Operating manual
c.
To replace the piston, first slide the light gray safety ring
of the piston rod upwards (Fig. c) and then unscrew the
piston (Fig. c').
d.
Screw a new piston onto the piston rod and tighten it
securely.
e.
Line up the gears of the piston and the piston rod by
turning the piston back by no more than half a gear
tooth.
f.
Slide the safety ring of the piston rod back down.
g.
Align the toothed strip (1) of the piston rod in the direc-
tion of the air vent opening (2) of the valve block. This is
located opposite the titrating tube connection (3). Care-
fully (!) insert the piston vertically into the cleaned or
new dispensing cylinder and push it about half-way in
(Fig. g).
2.
The sealing lip of the piston must not be damaged. Avoid
contact with hard objects!
The connection between the titrating tube and the valve
block was changed as of January 2012.
Therefore, when ordering these replacement parts, note the
distance between the dispensing duct and recirculation duct
on the valve block. If there is no gap between the two ducts,
always replace the titrating tube at the same time the dis-
pensing cylinder with valve block is replaced (Accessories/
spare parts, p. 86).
NOTICE
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