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Prometheus
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24 Posts
Discussion Starter #1
Bad news bears.

SOMETHING in my final drive broke loose. I haven't opened her up as of yet, but I have a feeling once I do that I'm gonna be here again and again looking for advice, and maybe y'all could use a little know-how on what's going on in there too.

I'll be uploading pictures of my progress here to have something to laugh at when I'm finished. If you all have ever torn up your final drive and ego at the same time, feel free to commiserate.

:doh:
 

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I never learn anything here unless somebody's had a bad day and decides to post something! Good luck with the tear-down.
 

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Prometheus
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Discussion Starter #4 (Edited)
EDIT: I don't know how to upload the correct image. I'm looking at the Final Gear page, mostly the 13101a assembly.

I never learn anything here unless somebody's had a bad day and decides to post something! Good luck with the tear-down.
Having not pulled anything yet (again, this happened 730pm with the sun going down) I'm fairly certain I'm looking at replacing the rear gear that redirects the rotation to the wheel. Looking everywhere I can, I can find NO PARTS NUMBER for what I'm talking about.

This place is going to be my HVAC while I try to make odds and ends line up. While I'm heated, I'll say this:

WHAT IS THE PARTS NUMBER?

92055c has a line right to it. I'm almost sure that's what I'm going to be looking at. Almost. At this point it's a matter of just trying to figure out what's going on with the lack of label. Anybody have a good time with this in the past?
 

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EDIT: I don't know how to upload the correct image. I'm looking at the Final Gear page, mostly the 13101a assembly.



Having not pulled anything yet (again, this happened 730pm with the sun going down) I'm fairly certain I'm looking at replacing the rear gear that redirects the rotation to the wheel. Looking everywhere I can, I can find NO PARTS NUMBER for what I'm talking about.

This place is going to be my HVAC while I try to make odds and ends line up. While I'm heated, I'll say this:

WHAT IS THE PARTS NUMBER?

92055c has a line right to it. I'm almost sure that's what I'm going to be looking at. Almost. At this point it's a matter of just trying to figure out what's going on with the lack of label. Anybody have a good time with this in the past?
Is this what you're looking for?

https://www.kawasakipartshouse.com/oemparts/a/kaw/500b253bf8700223e478e7fb/drive-shaft-final-gear
 

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have you removed the final drive from the swing arm yet? Its a pretty solid unit. More likely the cause is the splines and coupler (42034) and the splines on the input shaft/pinion gear. if thats the case, scour the internet for a replacement (used of course) rear final drive assembly that has good splines, and a new coupler.

its a known problem, someone on the assembly line was sleeping for a few years and didnt get any grease (or minimal) on them during assembly. We recommend inspection of the coupler and splines ANY time the rear wheel is removed.
 

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You probably won't be able to get internal parts for the rear drive. You might have to get a used final drive off ebay or the like. That part looks like it's the input shaft for the final drive, and also functions as the driving hypoid gear that drives the whole assembly. Is that correct? The splines on the outside of the final drive (where the driveshaft connects to the final drive) are a common failure point, unfortunately, but if it's something internal that'd be interesting and you might be able to piece together a used final drive with your current one.
 

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Prometheus
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Discussion Starter #10
Holy mackerel. Forum to the rescue.

So yes, I've just removed the rear wheel, final drive, baffles of the exhaust, one spring... I haven't slept. That all being said, I see what's being said about it being a pretty solid unit. I'm just now going to dive into the schematic to see what is and isn't in place, and lock on to what the problem is.

Thanks all for the support, I'm in deeper than I have been before, and as exciting as this is to *learn,* I really just can't wait to get this SOB running happy again.

More updates to follow.
 

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Prometheus
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Discussion Starter #12
Aside from the fact that I can't yet figure out how to upload a proper photo, yes, the splines of the input shaft/hypoid gear are indeed worn to a very severe degree (at the contact of the driveshaft, for clarity sake).

What I don't know now is how to be sure that the splines on the driveshaft end (that same point of contact) aren't also worn to a crisp. To my untrained eye, they all look even, accepting that they all look... short. There is a consistency to their height, lower towards the final drive with a slight sudden raised continuation towards the gearbox, and there are no exceptionally shiny faces that would indicate having been unreasonably cut from a standard height. The same schematic pertaining to the final drive includes a mediocre depiction of the driveshaft, which, in the illustration, doesn't seem to show and alteration in height at this set of splines.

------------------------------------------------------------------------------------------------------------------

^^^That's what I thought.

Upon referencing Fergy's badass "Spline Lube Procedure" I am more than certain that the driveshaft coupling is getting replaced as well. Thanks for that awesome write-up, Fergy.

https://www.vn750.com/forum/26-transmission-rear-end/17274-spline-lube-procedure-part-1-a.html

Once this is all said and done, I'm sure it'll be worth the grief. Right?
 

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Prometheus
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Discussion Starter #13 (Edited)
BTW

https://www.ebay.com/itm/1995-kawasaki-vulcan-750-FINAL-DRIVE-GEAR-DIFFERENTIAL/283096728339?hash=item41e9e14313:g:iG4AAOSwRF1bbcwj

this is a great deal! the splines look good, and $75 shipped for a final drive is sweet. If I were you I'd buy this and replace the oil in it and bolt it on. so long as your driveshaft splines are in good shape, that is.
This is an awesome offer, thanks for looking out. My biggest concern is if the '95 drive is compatible with my '03 VN. eBay is saying no-good, but I'm thinking that's due to a lack of form completion on the seller's end. To Google!

EDIT: BOUGHT THE DAMN THING
 

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you have nothing to worry about for compatibility across years.. all vn750's used the same drive train (minor exception for euro models, some may have had different gear ratio, but direct bolt on otherwise).

the short and skinny of the differences are:

85 only, 700 CC's due to harley tax, 86 on where 750's. other than the bore of the jugs, engines where mechanically the same
up to around 90 or so, self cancelling turn signals, makes the left controls slightly different, and some additional wiring for that, but main harness is the same
mid 90's I think, went from a square master cylinder for front brake to round, interchangable I believe, but I think you need early model brake lever for the square one

and the biggest one.. throughout the production run, every year or so, they changed the paint color/scheme
 

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My '03 has factory 4-way flashers! Pretty sure that was a change from the earlier models, but I don't know when that would have happened.

GDI
 

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This is an awesome offer, thanks for looking out. My biggest concern is if the '95 drive is compatible with my '03 VN. eBay is saying no-good, but I'm thinking that's due to a lack of form completion on the seller's end. To Google!

EDIT: BOUGHT THE DAMN THING
That is the wrong Final Drive for a 750. That one is for a VN1500
 

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Prometheus
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Discussion Starter #18
Okay then. Final drive is here, it's the right one, and all is good.

The newest problem is just my own hands. Getting the circlip back IN the coupler is a huge effort, and I gotta blame the pliers I'm using. Just ordered a new pair.
 

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Prometheus
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Discussion Starter #19
Right. I got everything with the final drive figured out, took it apart, put it back together, the damn thing works.

My rear brake is soft now. Like, REALLY soft. I haven't taken it apart again to see what happened in there, or figured out what may be failing on the outside. Life's curveballs.
 
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