Pratissoli SS64 Serie Manuel De Réparation page 28

Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston unit
must be replaced.
2.2.7 Reassembly of the head – seals – piston unit
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.5, taking
particular care with the following:
A) Seals pack: respect the same order used during
disassembly operations.
B) SN Versions: Lubricate the components ƒ with OCILIS
silicone grease code 12001600. This operation is deemed
necessary to facilitate the lip seal adjustment on the
piston.
C) SS and SW Versions: Lubricate components  and  with
OCILIS silicone grease code 12001600 on the external
diameter only.
D) For correct assembly of HP seals in their seats on the head
without causing any damage to lip seals, use suitable tools
according to the pump diameters as indicated in chapter 4.
E) Remount the pistons, tightening the screws with a
torque wrench, respecting the tightening torque value as
indicated in chapter 3.
F) Replace the head as follows:
1. Using two screws – service pins (code 27508200 ),
fasten the casing as indicated in (Fig. 40). Position the
complete head, making sure that it is centred only on
the central piston.
2. Complete operations, following the tightening
procedure. For the values of the torques and tightening
sequences follow the instructions in chapter 3.
2.2.8 Wiper disassembly (SW64)
Wiper replacement is necessary whenever leaks are detected
from the second drainage chamber present between the
spacer and the pump casing (Fig. 41). However, an indication
of estimated component replacement intervals is present in
the table in chapter 11 of the Use and maintenance manual.
Fig. 39
A) Unscrew the M12x190 head fixing screws as indicated in
Fig. 42.
B) Remove the head and the head spacer from the pump
casing.
C) Extract the wiper support (Fig. 43) and remove the wiper
using a simple tool as indicated in Fig. 44, taking care not
to damage the seat. If necessary, remove the piston spacer
before removing the wiper support (see par. 2.2.10)
Fig. 40
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Fig. 41
Fig. 42
Fig. 43