Assembling The Piston Unit - Supports - Seals - Pratissoli MK Serie Manuel De Réparation

To remove the low pressure seal, use a thickness gauge or
another tool which will not damage the seal support housing
(pos. , Fig. 163).
6.2 ASSEMBLING THE PISTON UNIT – SUPPORTS
– SEALS
Proceed with reassembly following the reverse order indicated
in par. 6.1.
Replace the pressure seals moistening the lips
with silicone grease (without spreading it),
taking extra care not to damage them during
liner insertion.
The O-rings and the pressure seals must be
replaced at each disassembly.
Insert the low pressure seal in the packing support (pos. ,
Fig. 164) taking care to choose the direction of assembly
where the seal lip is facing forwards (towards the head) and
the O-ring (pos. , Fig. 164).
Fig. 162
Assemble the support ting and the anti-extrusion ring
(pos. , Fig. 165), the three packings making sure the
notches are at 120° from each other (pos. , Fig. 166), the
packing scraper ring and the spring ring (pos. , Fig. 167).
Fig. 163
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Fig. 164
Fig. 165