April 2022
Installation, Operation and Maintenance Manual
E-90090007 Rev. 0
25
Section 7: Maintenance
Maintenance
6.
When installing the cylinder (17), grease the cylinder bore with the recommended
grease/lubricant prior to installing over piston (11). Make sure to install the lower
cylinder seal prior to lowering the cylinder onto the cylinder plate. Ensure that the
cylinder end is seated properly on cylinder plate and not pinching on the seal. Be
careful not to damage the piston seal when passing over the piston (11). Try to
maintain as vertical as possible when lowering down the cylinder).
7.
When installing the end cap (8), make sure to install the upper cylinder seal
beforehand. Apply grease to aid in maintaining the seal in position while
lowering the end cap (8) to cylinder (17). Make sure ports orientation is correct
and the seal is seated properly between end cap and the cylinder before the
installation of stay rods.
NOTE:
For spring-return operator, the end cap will be sitting on top of drive rod (for FS operator)
or on top of spring cartridge (for SR operator), not on the cylinder due to spring preload.
b.
If using a jacknut, install the jacknut handtight. Then, install the
jackscrews (make sure to apply Loctite or equivalent) in a diagonal pattern
and refer to Table 5 for torque specifications.
Table 5.
Specification of Jackscrew in Jacknut Tightening Torque
Piston Hex Nut Size
(-)
Tightening Torque
(lbf.ft)
1/2 NC
100
5/8 NC
185
3/4 NC
300
7/8 NC
450
