Interpump Group Pratissoli EV-E4 Serie Manual De Reparación página 19

To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.1.
Reassemble the valve units (Fig. 22 and Fig. 22/a) to facilitate
insertion of the valve guide in the seat, use a hammer, acting
on the whole circumference (Fig. 23).
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 M12x130 + M12x45 screws (suction
valve cover) and M12x35 (outlet valve cover)
screws, for the values of the torques and
tightening sequences follow the instructions in
chapter 3.
2.2.3 Disassembly of the head – seals
Replacement of the seals is necessary from the moment you
begin to detect water leaks from the drainage holes provided
on the back of the pump casing, and at the intervals indicated
in the "PREVENTIVE MAINTENANCE" table in chapter 11 of the
Use and maintenance manual.
A) Unscrew the M12x130 head fixing screws as indicated in
(Fig. 24).
Fig. 22
B) Separate the head from the pump casing.
C) Extract the high pressure seals from the head and the
low pressure ones from the support, using simple tools
as indicated in (Fig. 25), being careful not to damage the
respective housings.
Fig. 22/a
Fig. 23
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Fig. 24
Fig. 25