Dismantling The Piston Unit; Reassembling The Head - Seals - Piston Unit - Pratissoli KT Serie Manual De Reparación

Pay attention to the order of seal pack
disassembly as indicated in Fig. 28 composed of:
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. O-ring
2.2.4

Dismantling the piston unit

The piston unit does not require any routine maintenance.
Maintenance is limited to visual checks only.
To extract piston units: Loosen the M 7x1 piston fixing screws
as indicated in (Fig. 29)
Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston unit
must be replaced.
2.2.5 Reassembling the head – seals – piston unit
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.3, taking
particular care with the following:
A) Seals pack: respect the same order used during
disassembly operations.
B) Lubricate  components with OCILIS silicone grease
code 12001600. This operation is also deemed necessary
to facilitate adjustment of the lip seal on the piston.
C) 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.
D) Remount the pistons, tightening the screws with a
torque wrench, respecting the tightening torque value as
indicated in chapter 4.
E) Replace the head as follows:
1. Using two screws – service pins (code 27726000),
fasten the casing as indicated in (Fig. 30). 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.
Fig. 28
Fig. 29
23
Fig. 30