Changing The Piston With Piston Rod - ABB NAL Series Mounting And Operation Manual

18.5 Changing the piston with piston rod. Fig. 77
NB! Remove spring mechanism before starting. If a mechanism
is installed.
1. Close the switch-disconnector.
2. Disconnect the lower part of draw bar from the main shaft.
3. Disconnect the piston rod from the operating shaft and
piston can be taken out.
4. New piston is fitted the same way.
NB! Piston and cylinder MUST NOT be greased or
lubricated.
5. Connect the drawbar to the eccentric bolt on the main shaft.
Fig. 77 Piston rod
28 NAL/NALF – Mounting and operation manual
Fig. 78 Tightening torque for screws NAL 36-40,5