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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5021, rev. 00 10/2015 – SC/VHS - 20 -
8.3 Repairs
When needed, repair must only be carried out with Manufacturer’s original spare parts.
Original spare parts must be required to the Manufacturer with reference to the item numbers shown in
the next Section 10.
To ensure that right spare is provided, serial number printed on the SC/VHS series label must be
specified when spares are ordered.
8.4 Reassembling
8.4.1 Hydraulic cylinder re-assembling
Carefully clean the inside of the tube and check that the entire surface, particularly that of the bevels, is
not damaged. Lubricate with a protective oil or grease film the tube internal surface and the bevels at the
ends. Lubricate every seal groves taking care there are not damages on seal surfaces.
Re-assemble the piston rod into the head flange taking care to not damage the rod seals ring.
Re-assemble the cylinder tube taking care that the tube bevel has to smoothly compress the piston seal
ring; take care also not to damage the head flange O-ring.
Assemble the head flange with the spring cartridge by centering it on the inside diameter of the tube,
taking care not to damage the O-ring and tighten the screws to the recommended torque as per Table 1
in sec. 5.6.2.
8.4.2 Actuator re-assembling
Assemble the hydraulic cylinder to the adapting valve assembly tightening, with recommended torque
table, the screw between cylinder and housing.
Recommended tighten torque as per Table 1 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.
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