Disassembly Of The Piston Unit - Supports - Seals - Pratissoli LK Serie Manual De Reparación

Assemble the pump casing head (pos. , Fig. 134) taking
care not to hit the pistons and screw in the 8 M16x150 screws
(pos. , Fig. 135).
Proceed with calibration of the M16x150 screws with a
torque wrench as indicated in chapter 3 "Screw Tightening
Calibration".
Tighten the 8 M16x150 screws starting crosswise
from the 4 inner screws (see Fig. 135), to then
continue with the 4 outer screws, always
tightening crosswise.
Calibrate the M16x55 screws of the cover with a torque
wrench as indicated in chapter 3 "Screw Tightening
Calibration".
Apply the valve opening devices (pos. , Fig. 136) and screw
them in with the use of a 30 mm spanner (pos. , Fig. 137).
2.2.3 Disassembly of the piston unit – supports – seals
The piston unit requires preventive checks as indicated in the
Fig. 134
preventive maintenance table in the Use and maintenance
manual.
Maintenance is limited to visual inspection of any drainage
from the hole present on the lower cover. If abnormalities /
variations on the outlet pressure gauge or dripping from the
drainage hole circuit are detected, the seal pack will have to
be checked and replaced.
Proceed as follows to remove the piston units:
To access the piston unit, unscrew the M16x150 screws and
remove the head.
Remove the head taking care to avoid hitting the
pistons.
Disassemble pistons unscrewing the fixing screws (pos. ,
Fig. 138).
Remove the piston from the seal support and check that
its surfaces do not present any scratches, signs of wear or
Fig. 135
cavitation
Fig. 136
61
Fig. 137
Fig. 138