Milnor M60SGH01AE, Manual

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SECTION 9B BMP 720012/72136A
SERVICE=IDLERSHAFT BEARINGS
9B.1 GENERAL DESCRIPTION
The bearings used on the idlershaft are double-row spherical roller self-aligning bearings, SKF,
Link-Belt, Torrington, or equal. Bearings are attached to the shaft with locknuts and tapered
adapters. The idlershaft is designed with one bearing “fixed” and the other bearing “floating”.
Lubrication is provided by grease passages that are tubed to two grease fittings located on the
lower right cross brace. Grease is retained in the bearing housings by close-fitting covers.
9B.2 TO REMOVE BEARINGS
9B.2.A.
Remove the idlershaft pulleys on both ends of the shaft; remove the bearing
caps. Loosen the set screws which lock the bearings for the Brake Assembly to
the idlershaft (total of four (4) setscrews).
9B.2.B. To remove the soiledside bearing, screw a 1/4"-18NPT pipe fitting into the hole
in the soiledside end of the idlershaft. Loosen the bearing locknut. Using a
“Porto-Power” or similar hand operated pump, force fluid into the hydraulic
removal passage. Pump hard to build up fluid pressure. This pressure will be
transferred to the bearing inner race causing the race to expand slightly, just
enough to free the tapered surface and allow the bearing to slip off easily.
9B.2.C. To remove the cleanside bearing loosen the bearing locknut on the bearing
adapter, backing the nut about 1/8" from the bearing. DO NOT take the locknut
off of the adapter. Slip a piece of pipe (approx. 15" long) over the shaft. Place
one end of the pipe against the locknut and adapter. Strike the other end of the
pipe with a 5 lb. hammer, gently at first, then harder until the adapter snaps
loose. Hitting a block placed over the end of the pipe helps to inflict an even
impact on the bearing adapter; this should prove helpful in bearing removal.
After the bearing has been snapped loose remove the pipe, bearing locknut, and
washer; now the bearing will come out of the housing with a little assistance.
Be sure not to remove the bearing locknut from the adapter when trying to snap
the bearing loose; otherwise, the bearing and bearing adapter may come apart
violently; besides, there is a chance of damaging the adapter which may be used
again if it is not damaged during disassembly.
9B.2.D. When it is know that only the soiledside bearing is bad, it may be changed by
the above mentioned hydraulic method without damaging the cleanside bearing.
If only the cleanside bearing must be changed, however, the soiled-side bearing
should be removed first (hydraulically) before the cleanside bearing is
mechanically removed. If it is not removed first, minute indentations, invisible
in most cases, will be formed on the inner and outer races of the soiledside
bearing rendering it unserviceable.
When both bearings must be changed the order of bearing removal is not
critical.
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