Reassembling The Head - Seals - Piston Unit; Screw Tightening Calibration - Pratissoli HF Serie Manual De Reparación

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 ƒ 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 3.
E) Replace the head as follows:
1. Position the seal supports in the respective seats on
the casing;
2. Using two screws – service pins (code 27508200),
fasten the casing as indicated in Fig. 33. Position the
complete head, making sure that it is centred only on
the central piston.
3. Complete operations, following the tightening
procedure. For the values of the torques and
tightening sequences follow the instructions in
chapter 3.
3

SCREW TIGHTENING CALIBRATION

Description
Cover fixing screw
Piston guide rod fixing
screws
Oil drain plug
Lifting bracket fixing screw
Con-rod cap fixing screw
Piston fixing
Head fixing screw
Valve cover screw
* The con-rod cap fixing screws must be tightened
Fig. 32
simultaneously, respecting the phases indicated on
page 18.
** The head fixing screws exploded view pos. 39 must
be tightened with a torque wrench respecting the
order shown in the diagram in Fig. 34.
*** The valve cover fixing screws exploded view pos. 41
must be tightened with a torque wrench respecting
the order shown in the diagram in Fig. 34.
Fig. 33
24
Exploded Tightening
view position torque Nm
9 10
100 10
11 40
63 40
16 30*
29 20
39 80**
41 180***
Fig. 34