About two days ago I got the word from Randy F. (retired Ural dealer) that he was willing to do the work involved with replacing leaking seals and the worn driven gear hub on the final drive.
To prepare the final drive for transport to Randy's shop, I removed it (carefully slow due to my still recovering back) and cleaned it up.
The final drive is the component which takes rotating input from the primary drive shaft coming out of the motorcycle's transmission; converting it to rotating motion and "driving" the pusher wheel when in 1WD and also the sidecar wheel when in 2WD.
Here's the final drive, sort of cleaned up:
the arrow points to the driven gear
hub's teeth, onto which the rear wheel is
mated onto....
The worn out teeth of the driven gear hub are seen below. Quite pointy.
Below pic shows the replacement driven gear hub, note what the gear teeth should look like when compared to the above pic:
Here's the mostly cleaned up final drive, along with the new driven gear hub that Randy will install. The rubber boot goes on the sidecar drive shaft, I just zip tied it to hub to remind me to get a new one from Randy.
Next, I replaced the pusher wheel's splined flange, which mates the wheel to the final drive's driven gear hub. Here's what it looked like before I removed it from the wheel: Yep, quite filthy.
again, very pointy
gear teeth
Why are both items' gear teeth so pointy you ask? As they're "mated" or "coupled" together for operation, they induce wear on each other's teeth I believe. Eventually wearing down the teeth in spite of periodic applications of grease by me. (usually during oil changes of the engine).
Here's the new splined flange before I reinstalled the mounting bolts and inside wheel cover:
mounting hardware installed.
To show you the wear, I coupled the old splined flange onto the old driven gear hub's teeth. You can see how the gaps between the two sets of gear teeth were quite large.
Next, I put the old splined flange onto the new driven gear hub's teeth. I think I could have gotten away with not replacing the flange on the wheel but it would have induced wear sooner I think. Not to mention, it wasn't a hard task.
All this work below has been long over due I'm almost sad to say. I'd been thinking about replacing the driven gear hub on my 2014 Ural Patrol's final drive for quite a while now, but had put it off at any excuse.
For those of you who've been reading this blog for a while, you know that's quite unlike me. I use to rush to repair or service, now, not so much.
There's an upcoming fork in my riding life's road ahead I believe. Brigitta, my '87 R80 is gone to a new owner who'll ride it more than I had been. Yagi, the 2006 TW200 is proving a bit unreliable with a sporadic charging issue. Scarlett, my 2014 Ural Patrol has become a local riding only machine.
Part of me suspects that getting all this work done is to prepare for their eventual sale. Who knows? I'm coming up on 20 years of writing this blog, and loyal readers have seen it change ...
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