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Pay attention to the order of seal pack
disassembly as indicated in Fig. 22 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.
Proceed as follows to extract piston units:
A) Unscrew the piston fixing screws as indicated in Fig. 23.
B) 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 5.
D) Remount the pistons, tightening the screws with a
torque wrench, respecting the tightening torque value as
indicated in chapter 3.
E) Assembling the head: for the values of the torques and
Fig. 21
tightening sequences follow the instructions contained in
chapter 3.
3
SCREW TIGHTENING CALIBRATION
Description
Cover fixing screw
Piston fixing screw
Con-rod cap fix. screw
Valve cover fix. screw
Head fixing screw
Screw fix. Flange type "A"
Screw fix. Coupl. SAE B
Screw fix. PTO 2nd Flange
*
The con-rod cap fixing screws must be tightened
respecting the phases indicated on pag. 16.
**
The head fixing screws must be tightened with a
torque wrench, lubricating the underhead, respecting
the order in Fig. 24.
***
The valve cover fixing screws must be tightened
Fig. 22
with a torque wrench, lubricating the underhead,
respecting the order in Fig. 24.
**** The PTO 2nd flange fixing screw must be tightened
with a torque wrench, using Loctite 243 Blue.
Fig. 23
21
Exploded
Tightening
view
torque Nm
position
9
10
28
20
16
30*
38
80**
37
40***
62
22
64
40
72
145****
Fig. 24
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