Rear end maintenance performed......... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 04-28-2013, 08:49 AM Thread Starter
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Rear end maintenance performed.........

Even though my new to me 98 has only 8k miles on the clock I decided to pull the rear wheel and check the splines.

I am glad that I decided to check them.

They were greased but the grease was pretty nasty.

There was grease present on the bottom of the final drive so, I pulled it to clean it up and inspect it.

I quickly noticed that the O-ring was missing.

It's Hard to believe that any qualified mechanic would fail to replace such a crucial item.

I got lucky and found an O-ring at my local hardware store that was just the right size.

When I pulled back the boot to inspect the front of the drive shaft, I got another surprise.

There was NO lube at all.

Apparently the shaft had never been lubed.

Having fingers that are too fat to get into that space and properly lube it and not wanting to pull the swing arm I went with some lithium spray grease.

It's well lubed now and the splines looked good except for being dry so I dodged a big bullet.


I do have one question:

Is the spray grease good enough or should I pull the shaft (swing arm and all) and lube it with some high quality grease ?

The oil in the final drive was ready to be changed as well.

It has been drained and refilled with synthetic gear oil.



I bought the bike from my father in law.

He didn't do his own maintenance, he took it to the dealer.

So, it was the dealer who didn't replace the O-ring and never checked or greased the driveshaft.


The reason that I perform what maintenance that I can on my own bikes is so that I know it's done right.

This serves to reaffirm that !
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post #2 of 16 (permalink) Old 04-28-2013, 09:49 AM
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In my opinion, there is no need for lube at the u-joint end of the drive shaft. That union has no movement against each part. But if you feel better with lube on it, a spray lube is plenty for it.

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post #3 of 16 (permalink) Old 04-28-2013, 10:29 AM
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Fergy's Spline Lube write-up (generally considered the definitive work on the subject) specifies lithium grease spray on that joint so I think you will be fine. The write up is on this site, probably in the verses section. Give it a read and make sure you didn't miss anything important.

I have had bad luck with o-rings. I keep finding them broken and the grease spattered around the shaft housing, so I'm basically resolved to remove the wheel and check the splines every 4,000 - 5,000 miles, putting on fresh grease and o-ring. It only takes an hour or so and provides peace of mind.

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post #4 of 16 (permalink) Old 04-28-2013, 01:23 PM
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Fergy's write up is a "sticky" in this section, actually it is (for now) right above this thread. Not sure how ya missed it ...


As for spraying the U joint..."If it moves, it should be lubricated" (mechinics 101)

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post #5 of 16 (permalink) Old 04-28-2013, 01:54 PM Thread Starter
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Quote:
Originally Posted by niterider View Post
In my opinion, there is no need for lube at the u-joint end of the drive shaft. That union has no movement against each part. But if you feel better with lube on it, a spray lube is plenty for it.
The service manual specifies that it be lubed with High Temperature Grease.

Last edited by 3Fan4Life; 04-28-2013 at 08:25 PM.
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post #6 of 16 (permalink) Old 04-28-2013, 03:01 PM
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I am not lubing on mine. The u-joint has no fitting. Useless to lube the out side of it. The lube is neede inside the joint cups. To each his own, lube away.

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post #7 of 16 (permalink) Old 04-28-2013, 06:06 PM
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Quote:
Originally Posted by 3Fan4Life View Post

When I pulled back the boot to inspect the front of the drive shaft, I got another surprise.

There was NO lube at all.

Apparently the shaft had never been lubed.

Having fingers that are too fat to get into that space and properly lube it and not wanting to pull the swing arm I went with some lithium spray grease.

It's well lubed now and the splines looked good except for being dry so I dodged a big bullet.


I do have one question:

Is the spray grease good enough or should I pull the shaft (swing arm and all) and lube it with some high quality grease ?

the way I read this, you used lithium spray grease on the splines....not the u-joint.

If that is the case, I would say that you really should pull the front spline out and use moly 60 grease as suggested in Fergy's thread.

You can access the front splines by pulling the shaft out and back as far as the housing will let you. then try using a small brush to apply grease to the splines. in my case I did just that...then re-inserted the splined end before putting the rear wheel back on.
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post #8 of 16 (permalink) Old 04-28-2013, 08:42 PM Thread Starter
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Quote:
Originally Posted by kc2dgq View Post
the way I read this, you used lithium spray grease on the splines....not the u-joint.
Actually I put spray lube on both.

I sprayed the U-joint because it had some light rust on it

I guess that I will go back into it and put a heavier grease on the splines.

I should be able to wait a little while.

I'm not enthusiastic about dropping the swing arm but I probably should, so that I can inspect the U-joint properly.
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post #9 of 16 (permalink) Old 04-28-2013, 09:24 PM
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Quote:
Originally Posted by Knifemaker View Post
Fergy's write up is a "sticky" in this section, actually it is (for now) right above this thread. Not sure how ya missed it ...


As for spraying the U joint..."If it moves, it should be lubricated" (mechinics 101)
Link to table of contents for Transmission/Rear End technical forum:
https://www.vn750.com/forum/forumdisplay.php?f=26

Note 2 STICKY THREADS at the top.

Fergy's spline lube never moves, it is always stuck as the second thread in this tech forum, hence it is a "sticky" thread.

I usually just link directly to fergys thread, but quite often newer members of the forum think it is in the Vulcan Verses.
So to try and make it easier for members to remember where to find it, I will try this method for a while.

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post #10 of 16 (permalink) Old 04-28-2013, 09:38 PM
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Quote:
Originally Posted by 3Fan4Life View Post
Actually I put spray lube on both.

I sprayed the U-joint because it had some light rust on it

I guess that I will go back into it and put a heavier grease on the splines.

I should be able to wait a little while.

I'm not enthusiastic about dropping the swing arm but I probably should, so that I can inspect the U-joint properly.
you shouldn't have to drop the swing arm unless you are completely removing the drive shaft. You should be able to accomplish this with the rear wheel off by pulling back the rubber boot...just disengage the front coupling by pulling it apart and inspect the splines, grease them, and re-insert it.
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