Page 54 - Y-bearing-units

Mounting instructions

Mounting instructions Fig. 1
– general

To provide proper bearing performance and
prevent premature failure, skill and cleanliness
when mounting Y-bearings or Y-bearing units
are necessary. As precision components, they
should be handled carefully when mounting.
It is also important to choose the appropriate
method of mounting and to use the correct tools.
The method used for mounting a Y-bearing
unit depends on:
Tools
• the overall machine design To mount or dismount Y-bearing units,
• the Y-bearing housing design the following tools are required:
• the method used to attach the unit to the shaft
• a hexagonal key (hex wrench) to tighten or
NOTE: Failure to carefully follow applicable loosen grub (set) screws († table 1, page 54)
mounting instructions can result in premature • a hook spanner to tighten or loosen the lock
bearing failure or improper performance. For nut on an adapter sleeve († table 2,
further information, contact the SKF application page 55)
engineering service. • a hook spanner with a stud to tighten or
Detailed mounting instructions can be found loosen the eccentric locking collar
on the following pages. • a spanner or hexagonal key to tighten
Y-bearings, Y-housings or Y-bearing units or loosen the fasteners
should not be removed from their original pack-
aging until immediately before they are mounted. The hook spanners are part of the comprehensive
Before installing a Y-bearing unit, check that SKF range of maintenance products. Detailed
the shaft is clean and free of any burrs and that information can be found in the printed catalogue
the shaft seat is within tolerance. Also be sure SKF Maintenance and Lubrication Products or
that the support surfaces are clean and free online at www.skf.com.
of burrs and that the flatness is within the IT7
tolerance grade and that the roughness
R a ` 12,5 mm. Attaching Y-bearing units
to the support base
To reduce vibration and enable heat to dissipate
from the unit, the housing must be firmly
attached to the support base. To attach Y-bearing
units to the support surface, SKF recommends
using 8.8 class bolts or studs and a washer to
ISO 7089:2000 or 7090:2000 and a spring
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