Maintenance
9.2 Corrective Maintenance
WOGeneric TEAAC / 2008
56 Siemens AG Operating Instructions 1.03 1RQ671...-Z
9.2.8 Installing felt rings for the inner bearing seal
Some motors have felt rings fitted on the inner bearing cover at the non-drive end. The felt
ring prevents dust and grease from entering the interior of the machine.
Procedure
● Before installing new felt rings in the bearing cover, soak them in hot oil (approximately
80°C), such as DIN 51517-C100 lubricating oil.
● Dimension the felt ring so that the shaft can move freely, but is still tightly enclosed by the
ring.
● Place the felt ring into its notch on the bearing cap and push the bearing cap onto the
shaft.
9.2.9 Sealing the motor
Procedure
● Extreme caution and attention to cleanliness are vital to installation.
● Clean bare parts, e.g., between housings, end shields, and bearing bushes, and apply a
non-setting permanently plastic sealing agent such as Hylomar MQ32. Follow the
manufacturer's application and safety notes when doing this.
● Check the elasticity and age of all sealing elements, such as those on the terminal boxes,
and renew them if they are no longer effective.
9.2.10 Tightening torques for screw and bolt connections
Bolt locking devices
● Nuts or bolts that are mounted together with locking, resilient, and/or force-distributing
elements must be refitted together with identical, fully-functional elements. Always renew
keyed elements.
● When screwing together threads secured with a liquid adhesive, use a suitable medium
such as Loctite 243.
● Always use suitable securing devices or removable adhesives (e.g., Loctite) when
installing fixing bolts with a clamping length of less than 25 mm. The clamping length is
taken as the distance between the head of the bolt and the point at which the bolt is
screwed in.
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