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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5100, rev. 06 06/2020 – RTC/RTCS
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8.4.2
Actuator re-assembling
Assemble the pneumatic cylinder to the housing tightening, with recommended torque table, the screw
between cylinder and housing. Replace o-ring at the bottom of the housing making attention there are not
dirty or damage on the seal surface, put the bushing on its seat. Re-assemble scotch yoke and guiding
block, make a generous coating of grease on the contact surfaces of yoke and the bushings, assemble
the guide bar and close the assemble the plug to close the guide bar. Tighten the screw between cylinder
piston rod and guiding block, with recommended torque, using a wrench.. Assemble the o-ring, the cover
gasket and the cover with all screw.
Recommended tighten torque Table in Section 5.6.2.
Important
After maintenance operations carry out a few actuator operations to check that
its STROKING is regular and that there is no leak through the seals and fittings.
8.5 Mechanism Lubrification
RTC/RTCS actuators do not need lubrication during their life.
However, if during special maintenance operations it is necessary to replace the grease, the following
products are recommended.
8.5.1
Scotch yoke mechanism (see Paragraph 8.4.2)
Molykote G-4700 grease produced by Dow Corning
8.5.2
Pneumatic cylinder (see Paragraph 8.4.1)
Rheosil 500 F oil produced by Nye Lubricant, Inc.
Important
The above products cover the full range of temperatures from -60°C up to
+100°C.
Equivalent products can be used provided that they have the same
characteristics and the same range of compatibility with elastomeric and plastic
components.
