• Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Mind your bearings

duibhceK

duibhceK

Husqvarna
AA Class
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almost ruined our plans for the coming long weekend (national holiday), but I got my hands on a nice and relatively cheap second hand rim and sprocket carrier off a Sertao.

Not entirely sure what caused it. My current theory is that the sprocket carrier bearing failed (for unknown reasons). My gf didn't notice and continued her ride. I only saw some weird play in the sprocket during the beginning of our next ride.
So I'm not sure for how many kms it was that way, but is was enough to cause serious damage to the hub and to the sprocket carrier.

I'll definitely be keeping a close eye on all other bearings on both her and my TR and am considering doing a preventive replacement of all bearings (front+rear wheel, sprocket carrier, head stock and possibly also swingarm) before we leave on our trip to Siberia next year. Either that or carry them as spares in case one fails on route...
 
duibhceK said:
I'm not sure for how many kms it was that way, but is was enough to cause serious damage to the hub and to the sprocket carrier.

.. and am considering doing a preventive replacement of all bearings
... Either that or carry them as spares in case one fails on route...
Click to expand...

Looks like this is yet another weak point of the TR...you're not the first one with busted rear wheel/ carrier bearings and a resulting knackered hub/ carrier.
Upgrading to some decent bearings is not a big (nor expensive) job.
Considering the fact that all the wheel bearings are the same on the TR, I'd wondered about the pretty small-sized 6203s for the rear wheel, as normally the rear (carrying pillion/gear + the drive) bearings are sized bigger than the fronts in nearly all bikes I've come across in the past....additionally, the TR's weight distro is also rear-biased, adding to the above points.

I'm glad to have followed the previous advice here... and replaced the lot. I still keep checking the rear wheel bearings whenever the rear wheel is out.
I'm still suspect of the small-sized rear wheel bearings, keeping another set on the shelf.
No fun getting stranded with an expensive recovery bill and a busted holiday.... for $50 worth of bearings, arghhh.
 
What surprised me most was that it appears to have been the sprocket carrier bearings that failed first. And it was a double row cylinder bearing, whereas the drawings on ktm-parts.com seem to show 2 separate regular 6203 bearings with a spacer and retainer.
 
duibhceK said:
What surprised me most was that it appears to have been the sprocket carrier bearings that failed first. And it was a double row cylinder bearing, whereas the drawings on ktm-parts.com seem to show 2 separate regular 6203 bearings with a spacer and retainer.
Click to expand...


Twin bearings with spacer and retainer here. Can't remember the ##, but they were generics, nothing special. The swingarm bearings might be, though...many of the Euro bikes use Torrington bearings and are proprietary (SKF-group AFAIK).
 
The sprocket carrier bearings also break up on the 650GS, happened to me, I did a late night 450 km run home from a trip and kept hearing noise from around me at traffic lights at the end of the trip, every time I looked around there was a 4wd so rode home. In the morning I went to roll it out of the garage and the noise was a little odd, suffice to say I took another vehicle that day. I suspect I was lucky as the carrier was not damaged as in the pic here but the bearings and races were completely chewed up

It seems to be the fact water can get in there unlike the main wheel bearings, definitely worth keeping an eye on. The bearings are normally SKF
 
Check the OEM/Interchange index on ADV under "Drive Train>bearings" I think they are SKD 6203 and also 6204 with 30X40X7MM seals as I recall.
 
When I get back from our trip to France I'll see if I can find a part number on the double row bearing that failed.
 
Since we have 2 Terras and mine was due a new rear tyre, I figured that would be a good time to check its bearings as well. Wheel bearings were still a-ok. Sprocket carrier bearing was a different story.

I made a little smartphone clip of what I found.

I guess I better replace that one before it ends up like the other.
 
duibhceK said:
When I get back from our trip to France I'll see if I can find a part number on the double row bearing that failed.
Click to expand...

Couldn't get anything legible off the (double row) knackered one, but the one in the little clip above is an SKF Explorer part # 6204-2RSH/C3
 
duibhceK said:
...but the one in the little clip above is an SKF Explorer part # 6204-2RSH/C3
Click to expand...

That's exactly what I found in mine. I've re-used the spacer/ washer and the clip as there's no operating stress or load on those.
As per Charlie, the seal is a generic 30X40X7mm.


__________________________________________________________________

Unlike most other carriers, this one has TWO both bearings, side-by-side. with a small spacer in between.
Both bearings extract/ insert from one side only.

Sorry for the slightly blurred shot, but still clearly visible....double-depth bearing seat, showing the recess for the retainer clip.


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Factory bearings are SKF Explorer 6204, 2 off...


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...and a generic 30x40x7MM seal


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The entire stack of bits and parts
Left-to-right as it belongs into the carrier:
1) Bearing at the bottom
2) retainer clip and spacer
3) the second bearing
4) seal


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As the bearing seat is double-depth, I knocked the core out of one of the old SKF's, cutting and de-burring the outer to use as a tool
when carefully knocking in the new bearings.
Which should make for nice, smooth travel and seating of the new bearing without going askew along the way, possibly damaging the seat of the upper bearing.
The slot allows sufficient give to extract the ring after the first bearing's in place.




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I just noticed that the bearing in my rear sprocket carrier needs replacing. Are there two bearings in there? I haven't a clue as to how to remove the bearing. Is it an interference fit? Could you please tell me how to remove it? I just bought a new bearing from a local bike shop minutes before it closed. The owner told me it would be very simple to replace, but bashing it with a hammer is all I can think of, and that didn't work. Does it need heating-up? I can't see any circlip to remove. Please help!
 
Just for the record, I discovered my sprocket carrier bearings failed at around 62,000k. One was almost seized and the other had collapsed . Suffered a bit of damage to the new cush rubbers but thankfully the hub was fine.
They seemed to go without warning so check regularly. The giveaway was a squeak from the rear end, probably a combination of the bearings failing and cush rubbers complaining!
All in all, no complaints about lifespan. This bike has been through many creeks & rivers.
Make sure you get the replacement bearings with the "C3" designation for high speed use. There's a fraction more clearance for the balls for more heat & expansion.
 
Doing a routine service on a friend's Terra at ~ 10,000 miles.
All bearings were good...carefully removed the sealing discs...wiped a bit of the old grease out and repacked them.
What I DID do is replace the 2 30/40/7 rear grease seals and the front 25/40/7 front axle grease seal.
All 3 were worn...2 had broken tension springs...and none were providing a good seal.
Seems like good low-expense preventive maintenance...perhaps at alternating tire replacements...018.JPG
 
They're also the lowest grade SKF Eplorer bearings...(IIRC made in Portugal or Hungary or something like that).
Junked mine after 5000mi together with chain/sprockets/ sprocket-carrier and head bearings etc.
 
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