Sprocket sheered off
- Thread starter noob290
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Oleo-Mac 999
ArboristSite Member
You can not weld these pieces 
They are very harsh and break, when it spoil, only buying new.
They are very harsh and break, when it spoil, only buying new.
JB Weld?
Philbert
Philbert
Its deeply cut and past worn out but it should not have separated.
sweepleader
Chainsaws and Fire Trucks, perfect.
Looks like the braze flowed well on the spur but not the drum. The alignment pilot can also be seen.
I see this happen on carbide burs almost every day.
Once the burr is dull the stress (and heat) increases on the brazed joint which eventually gives in and lets go!
Considering the extreme wear of the sprocket neither a new nor used chain could have seated properly causing stress and vibrations whilst being driven resulting in tearing the sprocket off the drum.
As been said by others, there is nothing to salvage, that sprocket payed itself off tenfold - buy a new one!
jonsereds 621
ArboristSite Operative
jonsereds 621
ArboristSite Operative
For various reasons, i.e. part no longer available etc, I wish to remove a worn out spur drive from a clutch drum, and refit with a rim drive hub. I can see many probs ahead, however it seems simple enough at a glance. Has anyone here achieved this with success ?....... Someone somewhere managed to fit the two together easily enough. The method used has always looked like bronze welding rather than brazing to me.
Any enlightened comments would be useful.
Any enlightened comments would be useful.
Big Block
WFO or I don't go
What saw are you working on? Why don't you just buy a rim drive clutch drum?
If it was previously joined with bronze then it will be almost impossible to weld it now, the two methods are not compatible. What saw are you looking to put the sprocket/drum on?
Brand new spur...
Hopefully the chain or chains are not in the same worn out condition as the sprocket.
I bought a saw a couple of years ago that had that same problem.
sweepleader
Chainsaws and Fire Trucks, perfect.
That one was never brazed, there is a single spot of braze it looks like but it did not flow between the parts. Defective.
Came out of a plastic bag with an orange logo on it (seal was broken already). Part of an NOS parts lot I bought in an auction, probably from a saw shop that went out of business.
Defective OEM parts like that are rare but do happen.
(seal was broken already). Part of an NOS parts lot I bought in an auction, probably from a saw shop that went out of business.Defective OEM parts like that are rare but do happen.
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