Pratissoli MK Serie Manuel De Réparation page 76

Calibrate the screws with a torque wrench as indicated in
chapter 3.
Insert the O-ring inside the pump casing (pos. , Fig. 179)
and then the previously-assembled liner-seal support block
(complete with the same O-ring) to end stroke (pos. ,
Fig. 180).
Ensure that the liner-support block is positioned correctly
down to the bottom of the housing (pos. , Fig. 181); now
mount the front O-ring of the liner and the spring (pos. ,
Fig. 182).
Fig. 178
Mount the recirculation hole O-ring (pos. , Fig. 183).
Fig. 179
Facilitate keeping the O-rings in place with a light
smearing of grease.
Fig. 184 shows subsequent assembly of the head.
Fig. 180
76
Fig. 181
Fig. 182
Fig. 183