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Disassemble the suction and outlet valve units, screwing a
sufficiently long M10 screw in such a way as to be able to
reach the valve plate and extract the valve guide from the
valve seat (pos. „, Fig. 17).
2.2.2
Reassembling the head – valve units
Pay particular attention to the conditions of the
various components and replace if necessary,
and at the intervals indicated in the "PREVENTIVE
MAINTENANCE" table in chapter 11 of the Use and
maintenance manual.
At every valve inspection, replace all O-rings and all
anti-extrusion rings both in the valve units and on
the valve plugs.
Before repositioning the valve units, thoroughly
clean and dry the relative seats in the head as shown
in Fig. 18.
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.1. To
facilitate insertion of the valve guide in its housing, you can
use a bush resting on the horizontal guide planes and use
a hammer acting on the whole circumference (Fig. 19 and
Fig. 19/a).
code 26019400
code 27516900
Fig. 16/b
4
Fig. 17
Fig. 18
22
Do not invert the suction springs with the
previously disassembled outlet springs during
assembly of the suction and outlet valve units:
A) "White" suction springs.
B) "Black" outlet springs.
Insert the suction and outlet valve units,
checking that they are fully inserted in the head
seat.
Then apply the valve covers and calibrate the
respective M12x35 screws torque wrench at the
required tightening torque.
Fig. 19
Fig. 19/a
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