Bushed vs Bearing S/G end cap

[save_old_iron]

Bushed versus Bearing support on the rear end cap of an S/G generator

I'm doing a rebuild of an S/G motor and the rear end cap on the unit is a bushed support. Is there any reason to seek out a replacement end cap with a bearing support? Given the tractor may only get 100 - 150 hours a year use, is it worth changing the style of the end cap or just redoing the bushing (which appears to be OK).

Is it normal for the bushing to have a "hole" in the side ? to wick oil onto the armature shaft ??

thanks

[CADplans]

I would think there is almost no side load on the end cap end of a S/G.

A bushing would be better than a bearing in a no load situation, IMHO.

[restore49]

Is there area enough for a needle bearing - will reduce drag.

[TheSaturnV]

You cannot simply swap out the end caps. The armatures are different lengths, so you might as well switch out the entire S/G. I think the bushing gets plenty of loading by the torque placed upon the armature by the belt tension. In any case they do wear out, and more quickly than the bearing. Regarding the bushing cap, yes, that structure you see molded on contains a wick/weep hole system that is supposed to oil the rear shaft.

[jbrewer]

I suspect that the duty cycle of these things are so low (compared to say, an automotive application) that it wouldn't matter in any practical sense.

John

[Matt G.]

Originally Posted by jbrewer

I suspect that the duty cycle of these things are so low (compared to say, an automotive application) that it wouldn't matter in any practical sense.

John

What does that have to do with this? The bearing is always reacting the belt tension, and the armature is always turning in the bearing when the engine is on, no different than a car or anything else.

[cubby102]

Originally Posted by Matt G.

What does that have to do with this? The bearing is always reacting the belt tension, and the armature is always turning in the bearing when the engine is on, no different than a car or anything else.

I think he means the tractors aren't designed to run like a car. As in every day all day and hours upon hours at a time at sometimes much higher rpm. Even though I'm sure some of us prolly run our machines more then their vehicles.

[jbrewer]

Tractor: Typically constant RPM, very low electrical load, no other accy's on belt path.

Car: Constantly changing RPM, much higher electrical load, higher ambient temps, and I suspect, higher belt tension because of A/C compressor, PS pump, water pump, etc.

But hey , I'm just a lowly electronics engineer....

John

[TheSaturnV]

The next obvious question is, has anyone successfully reloaded their oil wick system with fresh oil? I believe that reservoir would have to run dry at some point.

[save_old_iron]

anyone ever take off the welch plug to see if there is a pad underneath?



I was thinking about your question regarding reloading the oil reservoir. Maybe a small hole at the top of the welch plug and fill with oil thru a syringe and needle - then a dab of silicone to seal the hole ?

thanks for the clarification on the different armature lengths for the different end cap styles