Lifespan for clutch drum

[msjanket]

How do you tell when your drum is worn enough to be replaced? Are new drums and clutches working by metal to metal contact or is there some other material on the surface that makes for better friction?
Do you get more slippage as a drum/clutch starts to wear?

thanks

 

[oldsaw]

How do you tell when your drum is worn enough to be replaced? Are new drums and clutches working by metal to metal contact or is there some other material on the surface that makes for better friction?
Do you get more slippage as a drum/clutch starts to wear?

thanks

Mine were torn up pretty good on my 066, but still worked fine. I replaced it since I used it as a milling saw at the time. Found a nice used one from a member of AS. The old one had two pretty good sized grooves in it as well as matching ones on the clutch itself. Well used BC logging saw.

They can be pretty worn and still work fine. If it can stall the saw, you are okay. If the chain stops or slows in a cut and the engine revs increase, you have a problem. Just my experience.

Mark

 

[SawTroll]

How do you tell when your drum is worn enough to be replaced? Are new drums and clutches working by metal to metal contact or is there some other material on the surface that makes for better friction?
Do you get more slippage as a drum/clutch starts to wear?

thanks

The drum on my 621 is about 37 yo, and no issues - I expect problems with the springs will appear sooner, in most cases.....:yoyo: :yoyo:

 

[oldsaw]

The drum on my 621 is about 37 yo, and no issues - I expect problems with the springs will appear sooner, in most cases.....:yoyo: :yoyo:

Excellent point that I neglected to mention. Thanks for covering my back SawTroll...

I've never seen a clutch as shredded as my 066 was, and it still worked, but springs over time will give problems too. I bow to the Troll...

Mark

 

[A100HVA]

as the old sayi'n goes " if it aint broke don't fix it"

 

[windthrown]

Drum replacement...

Hmmm, on spur sprocket saws the drum is attached to the sprocket. So the sprocket wear deternines replacement of the drum. Rule of thumb; 2 chains, time to replace sprocket. I think that sprocket wear tolerance on the Stihl spur is 2 mm of depth.

Now with replaceable rim sprockets, that is a different story.

 

[SawTroll]

Hmmm, on spur sprocket saws the drum is attached to the sprocket. So the sprocket wear deternines replacement of the drum. Rule of thumb; 2 chains, time to replace sprocket. I think that sprocket wear tolerance on the Stihl spur is 2 mm of depth.

Now with replaceable rim sprockets, that is a different story.

I don't have any saws with spur sprockets, except those who are not running anyway - so I don't know about that......

Standard set-up with the 621 was rim (3/8"x8), and drum - 60 and 62 was a different story, but I have never had any of those......

It is at least on its fourth bar, and no weaknesses in the clutch, so far........

 

[hornett22]

not sure..........

never had to replace one.

 

[SawTroll]

never had to replace one.

That's pretty much my point, also......:yoyo: :yoyo:

 

[SWI Don]

I have replaced them to put rim systems on them. I put a better used clutch in an old Husky 61 because the old spring looked terrible. I put a new drum on at the same time.

Don

 

[stihltech]

wear

Keep an eye on the inside of the clutch drum on larger Stihl saws. Have seen a few wear thin and come apart. Wipes out the oil pump, and maybe the case.
Clean it up, and see if there is a ridge in the inner edge. If there appears to be about half worn through, get a new one. It could save you a few hundred.

 

[rahtreelimbs]

IMO........it largely depends on the operator. If said person runs a dull chain and reefs on the saw constantly causing the clutch to slip.............or.............if you don't grease the clutch bearing...........then you get what you deserve.


I just replaced a clutch on an 066, the saw would cut but the clutch was well worn on the bearing side!!!

 

[rahtreelimbs]

The drum on my 621 is about 37 yo, and no issues - I expect problems with the springs will appear sooner, in most cases.....:yoyo: :yoyo:

So is your underwear..............but we won't go there!!!:notrolls2: