94
Pellerin Milnor Corporation
BNWG4M01 / 2020126
BNWG4M01
0000279245
A.2
3/20/20 10:26 AM
Released
Idler Shaft Bearing Replacement
BNWG4M01.C01 0000279244 A.3 A.2 3/20/20 10:26 AM Released
The bearings used on the idler shaft 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”. Lu-
brication 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.
How to Remove the Bearings
BNWG4M01.T01 0000279243 A.3 A.2 3/20/20 10:26 AM Released
1. Remove the idler shaft pulleys on both ends of the shaft.
a. Remove the bearing caps.
b. Loosen the set screws which lock the bearings for the brake assembly to the idler shaft
(total of four (4) setscrews).
2. Remove the soil side bearing.
a. Screw a 1/4"-18NPT pipe fitting into the hole in the soil side end of the idlers haft.
b. Loosen the bearing locknut.
c. Using a hand operated hydraulic 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.
3. Remove the clean side bearing.
a. 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.
b. Slip a piece of pipe (approx. 15" long) over the shaft.
c. Place one end of the pipe against the locknut and adapter.
d. 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 bear-
ing adapter; this should prove helpful in bearing removal.
e. 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 bear-
ing loose; otherwise, the bearing and bearing adapter may come apart violently. Also,
there is a chance of damaging the adapter which may be used again if it is not damaged
during disassembly.
When it is known that only the soil side bearing is bad, it may be changed by the above men-
tioned hydraulic method without damaging the clean side bearing.
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