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<strong>Ball</strong> BeaRIngs<br />
MACHINE UNITS<br />
A complete machine unit consists of either a standard (SM) or<br />
heavy (SMN) Series wide inner ring bearing, an inner and outer<br />
sealing cap, a retaining wire and self-locking collar – or an integrally<br />
sealed bearing and collar. These units are available as bearing<br />
replacements for <strong>Timken</strong> power transmission units such as the SA,<br />
SAO, DSA and DSAO pillow blocks, C and Co cylindrical cartridges<br />
or special housings.<br />
The “caps” are two steel members which comprise a nonintegral<br />
frictionless labyrinth seal. The inner member is pressed on<br />
A-TYPE<br />
Figure 1 shows a machine unit with an A-Type bearing<br />
carrying the designation MUA (standard series) and MUOA (heavy<br />
series). It consists of a wide inner ring, open type or one-piece<br />
R-seal bearing, collar, caps and wire. The “caps” are two steel<br />
members which comprise a non-integral frictionless labyrinth seal.<br />
The inner member is pressed on the inner ring and rotates with it.<br />
The outer member is pressed in the housing against the face of the<br />
outer ring and is held in place by the round retaining wire.<br />
A-Type units are being converted to a KR-Type bearing with<br />
collar, B-Type cap and wire.<br />
B-TYPE<br />
Figure 2 is the same as Figure 1, except that the bearing is B-<br />
Type and seal on collar side is either a labyrinth seal (as shown)<br />
or a one-piece R-Seal. In the latter case no wire is supplied. The<br />
designation of the machine unit is MUB (standard series) or MUOB<br />
(heavy series). The B-Type bearing is mounted in the spherical housing<br />
seat by means of two slots milled diametrically opposite each other<br />
in the housing. The bearing can be inserted at right angles and<br />
swiveled into position. No additional shoulders or snap rings are<br />
required to locate this type.<br />
B-Type units are being converted to a KRB-Type bearing and<br />
collar.<br />
D140 TIMKEN PRODUCTS CATALOG<br />
the inner ring and rotates with it. The outer member is pressed in<br />
the housing against the face of the outer ring and is held in place<br />
by the round retaining wire.<br />
The A-Type unit is designated MUA (standard series) or MUOA<br />
(heavy series); the B-Type MUB (standard series) or MUOB (heavy<br />
series). The B-Type bearing is mounted in the spherical housing<br />
seat by means of two slots milled diametrically opposite each<br />
other in the housing. The bearing can be inserted at right angles<br />
and swiveled into position.<br />
A TYPE<br />
A TYPE<br />
B TYPE<br />
B TYPE<br />
COLLAR<br />
WIRE<br />
A CAP<br />
B CAP<br />
BEARING<br />
COLLAR<br />
WIRE<br />
A CAP<br />
B CAP<br />
BEARING<br />
Figure 1 – MUA, MUOA<br />
COLLAR<br />
WIRE<br />
A CAP<br />
B CAP<br />
BEARING<br />
COLLAR<br />
WIRE<br />
A CAP<br />
B CAP<br />
BEARING<br />
Figure 2 – MUB, MUOB
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