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Message started by mark_k on 09/26/10 at 11:23:09

Title: Driven Pulley Bearing
Post by mark_k on 09/26/10 at 11:23:09

To all you Savage Lifers - I have a 2002 Savage with 12K miles on it. Noticed the other day that I have some wobble play in the driven pulley on the rear wheel, no play in the rear wheel. I am wondering about the bearing in the driven pulley hub and the rubber shock absorbers in the rear wheel (hub). I know the rubber gets stiff over time and then wears. Should there be any play in the driven pulley? In my mind I would think it should be pretty tight to lateral play when everything is in specs.
:-?

Title: Re: Driven Pulley Bearing
Post by verslagen1 on 09/26/10 at 12:18:30

I don't think there should be much side to side play.

Does it squeak?

Was it hard to adjust the belt to center in both directions?

If you like to thump along at low rpm's then there'll be a lot of back and forth motion to wear your rubber dampers out. I put a little grease on them.

Title: Re: Driven Pulley Bearing
Post by Routy on 09/26/10 at 12:43:30

Why do you think there is a pulley bearing ? Wouldn't the only bearings be the wheel bearings ?
And if the pulley is not bolted directly to the wheel, but instead has rubber dampers between, and the pulley is able to move around, wouldn't the rubber dampers be worn out and need replacing ?

But then, I don't have the foggiest idea,......I'm just using a little bit of
logical thinkin,....I think.

Title: Re: Driven Pulley Bearing
Post by verslagen1 on 09/26/10 at 13:30:43

Hmmmm... logic
pulley not bolted to wheel...
floats on rubber dampers...
gets a hell of pulling on by the belt...

so why wouldn't it have it's own bearing?

or you could look it up ;D

Title: Re: Driven Pulley Bearing
Post by justin_o_guy2 on 09/26/10 at 14:57:41

The spacer on the axle seats into a seal. I wunner if theres a bearing inboard of thaT seal? Ohh, Im bettin Yayuhh...

Title: Re: Driven Pulley Bearing
Post by ralfyguy on 09/26/10 at 15:26:02

If the rear pulley is not supposed to move around, why is the rubber dampers???

Title: Re: Driven Pulley Bearing
Post by verslagen1 on 09/26/10 at 15:31:13

5D4E5958474A4C4E451A2B0 wrote:

If you like to thump along at low rpm's then there'll be a lot of back and forth motion to wear your rubber dampers out. I put a little grease on them.

yes I tend to repeat myself.

Title: Re: Driven Pulley Bearing
Post by Routy on 09/26/10 at 16:17:23

Ok, so, w/o "looking it up" (I don't have a book) I would have to guess the pulley may have its own bearing to take on the pull of the belt,.... and keeps the pulley from moving side to side. The rubber dampers probably take up the rotational shock,.......makes sense anyway.

Just a guess, of course. And I sure wouldn't want anyone w/ a book telling us how its really works ! ::)

Title: Re: Driven Pulley Bearing
Post by Lupo on 09/26/10 at 16:32:37

#16 http://personal.inet.fi/cool/alppu/bike/wt_311.jpg

Title: Re: Driven Pulley Bearing
Post by verslagen1 on 09/26/10 at 16:41:42

Give a man a fiche and he has a meal.
teach him to fiche and he's fed for life.

ya got a computer don't ya?
any online shop gives you direct access to fiche.
here's a good fiching hole...
http://www.boulevardsuzuki.com/fiche_select.asp
(such a hard name to remember though)

Title: Re: Driven Pulley Bearing
Post by mark_k on 09/26/10 at 20:33:18

Haven't pulled the driven pulley yet, but I am thinking the rubber shims have gotten hard and worn, which puts additional stress on the driven pulley bearing causing it to wear prematurely. Will report back next week when the parts are in and I get the wheel pulled. Planning to put a little silicone grease on the contact points with the rubber pieces.
The belt seems to stay centered currently and it was not making any noises. Found it when I was adjusting the shock preload for 2 up.

PS - FYI: They sell the rubber shock absorbers as single pieces, not sets of 6.

Title: Re: Driven Pulley Bearing
Post by Charon on 09/26/10 at 20:37:52

I don't think I would want to use any grease on those rubber dampers, because grease might collect dirt and turn abrasive. I'd use a silicone spray, graphite, talc, mica, or something else dry. They aren't supposed to move, anyway. They compress or relax to smooth engine power pulses.

By the way, chain drive bikes use them, too, and for the same reason.

Title: Re: Driven Pulley Bearing
Post by Lupo on 09/26/10 at 20:51:27

456E67746968060 wrote:

You are absolutely right about not greasing them. Clean the inside of the hub, wash the rubber dampers with soap and water and put it back together. You should do it every time you change your tire. It's called a cush drive and most bikes have them now. Even my shaft drive Guzzi's.

Title: Re: Driven Pulley Bearing
Post by verslagen1 on 09/26/10 at 21:07:49

4D666F7C61600E0 wrote:

Thanks for the info, will let you know how much dirt collects next time I change it out.

Title: Re: Driven Pulley Bearing
Post by mark_k on 09/27/10 at 08:12:30

664D44574A4B250 wrote:

What was I thinking? The grease sure can make assembly easier, but silicone spray can work just as well. Will try to keep that in mind. (After fifty, the mind works more like a steel trap that's been left out in the rain.) ;D

Title: Re: Driven Pulley Bearing
Post by mark_k on 10/05/10 at 06:42:13

Got the job done this past weekend. Noticed slight wear in both the rubber cushions in the hub and the bearing in the driven pulley. The combination allowed some wobble with torque. Replaced the cushions and the bearing in the driven pulley. After reassembly, there was no wobble or play.
As to the grease, noticed that the original stock cushions did have a thin film of what appeared to be a lithium type grease (white), but didn't see any significant debris stuck to the cushions or in the hub.
After getting it all put back together, (did rear brakes at the same time) seem to be less vibration with engine pulses.
FYI - Bike is an '02 with 12K miles on it. Gets ridden in all types of weather. Now on 3rd rear tire. Second had early replacement due to screw tearing the tire at the sidewall junction to the tread.

Title: Re: Driven Pulley Bearing
Post by Digger on 10/20/10 at 20:27:45

1B30392A3736580 wrote:

I agree that a dry lube would be better.

I used this stuff:

http://www.crcindustries.com/hd/content/prod_detail.aspx?S=Y&PN=03084

on the rubber cush drive inserts in the rear hub of my ST1100. I've not yet had it back apart, so I don't know how it is working.

Seemed like a good idea, though. This moly spray goes on like a tough coat of paint. The web site specifically says it is good for conveyor belts and rubber moldings, among other things.

Might be worth a shot on our bikes.

Title: Re: Driven Pulley Bearing
Post by justin_o_guy2 on 10/20/10 at 20:38:46

When I put the tire on I took the old cush drive out & shimmed it snug with strips of inner tube.