Weird Clutch

[donbj]

Anybody see a clutch like this? Taking a 2100 apart for inspection/rebuild and see this. Seems too symmetrical for abnormal wear but most likely is. The drum has the same profile but is a stock number drum. Anyway kinda neat and weird. Took it apart to salvage the spring and drive unit.

[DHansen]

Odd how perfectly centered the wear is.

[donbj]

Yes it's seems odd it's so uniform. Even looks like two different materials

[doc henderson]

where is the contact surface and what does it look like.  they look manufactured with a low spot in the center.  do you have a new one for comparison.  

[doc henderson]

this is what I found.

[Spike60]

Don, we're there any pieces of the original clutch shoes or springs missing? Perhaps had been inbedded in the drum?

[DHansen]

Doc's photo makes sense as to the wear pattern.

[DHansen]

But Don's clutch shoes look different style than the ones in Doc's photo.

[doc henderson]

I agree with that.  I assume this is for a Husqvarna 2100 cm?

any pics of the inside of the drum?



this looks similar and states it fits the 2100

[Spike60]

I see the similarity; but I still don't get it. The clutch can wear the drum, or the drum can wear the clutch. But the clutch can't wear itself, right? 

Don, 2100.parts are scarce. You have sources of 2100 parts up there?

[rusticretreater]

It looks to me that the clutch uses the two raised areas.  If you notice, all of the pieces have places at both ends that don't show wear.

Based on what I see online, that must be some kind of aftermarket clutch as it doesn't match the OEM clutch.  Can you show the hub of the clutch and its springs?

[DHansen]

I am thinking its a normal wear pattern that is caused by that clutch design.  Not affecting its performance.

[DHansen]

Don, does the clutch look the same as in Doc's photo?  Does the inside surface of the drum have a groove that matches with the shoe? Photo of drum?

[donbj]

Doc's photo looks like a 394/5 clutch. I have a bunch of them. All my 2100's look like the one on the saw posted here. This weird one looked "normal" til I removed it. It's the one sitting beside the 2100 here. The spring is missing as I removed it.

[donbj]

Don, we're there any pieces of the original clutch shoes or springs missing? Perhaps had been inbedded in the drum?

Bob, it was a complete working clutch on a running saw. Looked totally normal til I took it off when taking the saw apart. Was just going to re-seal the saw because of a slow vaccuum leak down, pressured fine though. Then got carried away and took it completely apart. Good thing as clutch side bearing was pretty dirty.

[donbj]

I see the similarity; but I still don't get it. The clutch can wear the drum, or the drum can wear the clutch. But the clutch can't wear itself, right? 

Don, 2100.parts are scarce. You have sources of 2100 parts up there?

The drum is worn to the same profile, How? I don't know. What came first, chicken or the egg?

I have a pretty good stash of parts from prowling around the last few years.

[DHansen]

Very strange.  Does the clutch with the worn shoes and drum have a blue color to the shoes, like it got too hot?  Thanks for sharing the additional photos.  

[doc henderson]

In some ways the older image looks like it blued the metal getting hot.  the drum and shoes almost appear to have a contact area on the outer two sides.  can you show a pic of the shoes from the sides?  very interesting to try to access from photos.  More is more.   .  The add states the pictured ones fit a range of saws including the 2100.  I wonder if they changed the design or are using a different design now.

[doc henderson]

the two grooves on the inner and outside of the drum look to be more worn and that is where the shoes look more abrasive and grippy.  Maybe as the need for parts declined as the saw was no longer made, they now sub a clutch mechanism for the "younger" saw to use.  Just thinking outloud.

[donbj]

In some ways the older image looks like it blued the metal getting hot.  the drum and shoes almost appear to have a contact area on the outer two sides.  can you show a pic of the shoes from the sides?  very interesting to try to access from photos.  More is more.  .  The add states the pictured ones fit a range of saws including the 2100.  I wonder if they changed the design or are using a different design now.

The 394/5 clutch fits the 2100. The design changed when they started the 394's that took over after the 2100.

The drum and clutch on my weird clutch looks like it got pretty hot a few times

[doc henderson]

after it got grooved in, it may have constantly had some contact causing it to make heat.  I hope you get this figured out.  did you say the saw worked as it should prior to the dismantle?

[donbj]

The clutch operated fine. It retracted from the drum at idle just fine the few times I fired it up. Never cut with it. The previous owner cut firewood with it. I don't intend to use it going forward. Just some strange anomaly. Has me a bit puzzled as to the wear pattern