PR750H
MECHANICAL MAINTENANCE
Installing the new hydraulic cylinder
Hoist the new cylinder in and place it a bit from the center plate. Mount the spring loaded gasket, and the 4 spacers.
Tighten nuts on the rods loose, and make sure that the cylinder is level and in line with the extruder cylinder. Fit the
piston and the linear encoder on the new cylinder.
If necessary replace the piston ring before installing, the screws [11] have to be lubricated and then tightened equally
and with torque 21.4 Nm. Reassemble the machine and tighten the nuts [16] to 571 Nm. To check if the hydraulic
cylinder is installed correctly, drive the piston all the way forward. With little force it should be possible to turn the piston
in this position. Mount the hoses and plugs. Refill the hydraulic oil if necessary. Before installing the extruder plate, it’s
important to check if the extruder barrel is clear on the inside, and that there is nothing preventing the piston from
operating.
Assemble the hydraulic cylinder, going backwards in the procedure steps. After completion check for leaks and degassing
sleeves are tightened correctly.
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