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Pay attention to the order of seal pack
disassembly as indicated in Fig. 44 composed of:
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. Circlip
8. O-ring
2.2.4
Disassembly of 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:
-
Unscrew the M7x1 piston fixing screws as indicated in
Fig. 45.
Check and verify their conditions, replace if necessary.
At every disassembly, all O‑rings on the piston
unit must be replaced (Fig. 46, pos. ).
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.
Fig. 44
B) Lubricate the components (Fig. 44) 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) Assembling the head: for the values of the torques and
tightening sequences follow the instructions contained in
chapter 3.
Fig. 45
30
Fig. 46
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