Bearings are of standardised dimensions. In your case 6902 is 15 x 28 x 7 (inner diameter x outer diameter x width) and 6903 is 17 x 30 x 7 (which you probably got from Google). If your sprag clutch has any play on the torque sensor then you'll need to add shim washer there too, I will likely place them between the torque sensor and sprag clutch to give a bit more wobble room. Earlier motors actually had them there.

Because of the properties of ceramics, a hybrid bearing's service life can be up to 10 times that of a standard steel bearing, reducing the need for maintenance on your machine as well as the costly interruptions in production. In addition to the shim washer procedure I mentioned in my previous post, on the non-drive side you can add a second bearing as far out as possible. Then remove all play between the inner races and spindle and preferably between the outer races and housing too. Replacing the dust seal in the spider with a 6902 bearing may also help. I have posted about Enduro bearings which are for sealed for external use. b:7 mm; Grub (set) screw size:M6; B:15 mm; G:M 65x2; Associated spanner:HN 12-13; h:3 mm; Recommended grub screw tightening torque:8 N·m; d1:77.5 mm; B3:3 mm; d3:85 mm; If you can remove the play you can go some way towards mitigating the wobble. You could use additional bearings, retaining compound and/or shims. I've been posting about this in the mega thread recently, starting from around here.Mrc hybrid bearings run cooler and can operate with thinner lubricant films than conventional bearings. The result? Less aging of the grease, longer relubrication intervals, and increased service life vs. Standard bearings in the same operating conditions. cheaper options with no signature required. The no signature required options are at the customer’s risk once the goods leave our store. Simply replacing the bearings with name brand ones won't help (apart from longevity). The majority of play isn't within the bearings themselves. There is some play within the sprag clutch but nothing can be done about that. Registered Australian Company: Small Parts & Bearings Pty Ltd (ABN 79 121 865 414) - Trading as Bearing Shop Online Perhaps some retaining compound between the sprag clutch and big gear wouldn't be a bad idea. On mine it looks like there might be slight gap behind the spider where it could still potentially move. I currently have my motor apart and have been thinking how to improve things because I also had the chain ring wobble and rubbing over the pinion gear area.

B1:121 mm; Calculation factor Y1:2; Ba min.:21 mm; Da max.:216 mm; Fatigue load limit Pu:104 kN; Basic static load rating C0:1060 kN; Mass bearing + sleeve:18.5 kg; D:230 mm; Reference speed:1900 r/min; Limiting speed:2600 r/min; Size (mm):60 mm x 130 mm x 31 mm ; Hybrid ceramic ball bearings use a combination of traditional stainless steel rings precision matched with silicon nitride (ceramic) balls. In addition to being excellent electric insulators, hybrid bearings have a higher speed capability and will provide longer service life than all-steel bearings in most applications. According to the available data, this motor can produce somwhere around 90 Nm of torque, so I will use this number for calculation. Radius of the "big gear" is about 58 mm. To produce 90 Nm of torque, motor must provide about 1550 N (it is like weight of 158 kg!). So far, so good. It seems like essentially the helical gears want to screw together, pulling the big gear in towards the pinion gear. But not only did they change from straight-cut spur gears to helical, but they introduced more play at the same time. The second 6902RS bearing on the spindle was removed and the sprag clutch fit on the torque sensor was loosened. Previous a puller was required to remove the big gear and sprag clutch, now it slides off easily. Instead of adding a thrust bearing behind the torque sensor, we get two teflon washers.The HK2214 roller bearings have a nice interference fit in the gear case but are sloppy on the torque sensor assembly. This may actually be necessary for the torque sensor to work properly. The 6902RS is the only bearing directly supporting the spindle. The inner race is a terribly loose fit and it's not great within the housing either. None of these bearings support axial load.

D:130.0000 mm; Accessories:One Shield & Snap-Ri; Fillet Radius ra:2.00 mm; Sealed Speed Rating n3:3400 rpm; Oil Speed Rating n2:4500 rpm; Basic Dynamic Radial Load Rating C:134000 N; Basic Static Radial Load Rating Co:143000 N; B:54.00 mm; Grease Speed Rating n1:3400 rpm; d:60.000 mm; Ceramic balls are only 40% as dense as steel balls, the centrifugal load that they generate is less and the internal bearing friction is lower. The lower density and friction enables cooler running under the same operating conditions, or even higher rotational speeds.Calculation factor Y2:3.9; r1,2 min.:2.1 mm; b:11.1 mm; Basic dynamic load rating C:652 kN; Fatigue load limit Pu:73.5 kN; Calculation factor Y1:2.6; Basic static load rating C0:765 kN; K:6 mm; d3:155 mm; ra max.:2 mm; Size (mm):10 mm x 35 mm x 11 mm ; What i didn't realize is that the increased space allowed the big gear to slide invards on the sprag clutch outer surface and start putting pressure on the torque sensor coil, rubbing it against the casing and the static coil, until it broke. ball bearings, roller bearings, thrust bearings, ceramic and ceramic hybrid bearings, stainless steel bearings, miniature bearings, linear bearings, shafting, corrosion resistant bearings - see the full listing in the When electrical current passes across bearings, a washboard pattern appears on the raceways, along with a darkened grey appearance. Typical results include bearing surface damage, premature aging of the lubricant. The natural insulating properties of ceramic material eliminates this type of damage.