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Pay attention to the order of seal pack
disassembly as indicated in Fig. 26 composed of:
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. O-ring
7
6
5
2.2.4
Disassembly of 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. 27)
Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston unit
must be replaced.
2.2.5
Reassembly of 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 deemed necessary to
facilitate the lip seal adjustment on the piston.
4
3
2
1
Fig. 26
Fig. 27
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 27508200),
fasten the casing as indicated in (Fig. 28). 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.
3
SCREW TIGHTENING CALIBRATION
Screw tightening must only be performed with a torque
wrench.
Description
Cover fixing screws
Oil drain plug
Piston fixing screws
Con-rod cap fixing screws
Screws fixing cover of
Outlet valve
Screws fixing cover of
Suction valve
Head fixing screws
Pressure gauge application
plug
*
The con-rod cap fixing screws must be tightened
simultaneously, respecting the phases indicated on
page 15.
**
The head fixing screws exploded view pos. 13 must
be tightened with a torque wrench respecting the
order shown in the diagram in Fig. 29.
***
The valve cover fixing screws exploded view
pos. 10-13 and exploded view pos. 22 must be
tightened with a torque wrench respecting the order
shown in the diagram in Fig. 29.
20
Fig. 28
Exploded
Tightening
view position
torque Nm
42
10
47
40
14
20
39
20*
22
120***
10-13
120***
13
120**
68
40
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