B7100 - disassembling dynamo

[dextersl]

grossgary, thanks for the info and offer. My B7100 is still down, I am getting ready to put it back together this week. My MMM (RC60-71B) is currently off of the tractor, once I get it back together and up and running I can take those pictures you asked for unless someone else has already provided them for you.

I have attached pictures of the new bearing and old bearing together in case anyone was interested in seeing it before I reassembled the dynamo. The first picture shows the front of the bearings with the damaged shield that popped off. and the second photo shows the back of bearing with a damaged shield still intact. The new bearing uses a rubber seal to protect the bearings on both sides as opposed to the metal shielding used on the old bearing.

 

[canucklehead]

hmmmm, my B7100 had an awful burning rubber smell and alternator belt wasn't spinning, or maybe it was alternator pulley wasn't spinning and belt was smoking. So this dynamo bearing could be my culprit? i haven't tore into it to try and diagnose. I guess loosening alternator and checking to see if that pulley turns easily will be first starting point and go from there. Where is this dynamo? Bottom of the belt loop?

 

[Gator6x4]

grossgary, thanks for the info and offer. My B7100 is still down, I am getting ready to put it back together this week. My MMM (RC60-71B) is currently off of the tractor, once I get it back together and up and running I can take those pictures you asked for unless someone else has already provided them for you.

I have attached pictures of the new bearing and old bearing together in case anyone was interested in seeing it before I reassembled the dynamo. The first picture shows the front of the bearings with the damaged shield that popped off. and the second photo shows the back of bearing with a damaged shield still intact. The new bearing uses a rubber seal to protect the bearings on both sides as opposed to the metal shielding used on the old bearing.

Don't pry or mess with the rubber seals. Those type bearings are called permanent lubricated bearings with no provision for injecting a lubricant. They are designed to operated in a dry environment such as the inside of a alternator or dynamo.

Good job.

 

[canucklehead]

Don't pry or mess with the rubber seals. Those type bearings are called permanent lubricated bearings with no provision for injecting a lubricant. They are designed to operated in a dry environment such as the inside of a alternator or dynamo.

Good job.

I've used a dental pick to pop off those seals and then inject more grease. They seem to have minimal grease. I'm sure they're probably engineered that way but I figure extra grease can't hurt. Reality is: probably only a tiny smidge of the grease is ever in contact with the metal pieces (ball bearings, cage, etc...) so probably what they put in is adequate but I figure it seized due to drying up so more grease will give longer life.