Wear on a star clutch sprocket

[redbrass_ca]

Hi all!

Is there a good rule of thumb as to when to replace a 5 point star sprocket clutch housing. Overtime the sprocket forms grooves from the friction existing between the chain and sprocket. How deep can they get before the clutch housing should be replaced.

Thanks for the input

Thierry G. Papion

 

[scottr]

My Stihl 044 Owners Manual states ," The stress and strain on the chain sprocket are particularly high . If the wear marks on the teeth are very pronounced (about 0.5 mm/0.02 in deep), the sprocked should be replaced ."

 

[Oregon Engineer]

I agree with scottr. When the wear on the spur teeth gets beyond the .02", the tie straps and cutters will experience burrs. The burrs are caused by the sprocket tooth contacting the bottom notch in the tie straps and cutters. The burr increases in size until it contacts the drive link. The burr will hinder or prevent any articulation between the drive link and the tie straps or cutters. Once the articulation is hindered the wear of the bar tail entry, bar nose bottom, bottoms of the cutters and tiestraps will wear at a much accelerated rate.

 

[redbrass_ca]

Thank you for the thorough explanations on the deterioration of the chain and bar. It appears I might have to replace the clutch housing.

Thanks T. Papion

 

[timberwolf]

I don't know what saw, but if you can going over to a rim drive, it is very nice rims are less $ to replace and you have the option of changing chain size or gearing, on some saws they are availible stock or aftermarket, other not.

 

[olyman]

timberwolf--i agree with your rim drive statement--but know what-the $%^#$%^ manufacturers are building less and less rim drives--why??????????? because they cant sell as many sprockets!!!!!!!!!!!!!!!!! 090 stihl is a case in point--only can buy the one piece now--and i dont have to tell you how costly those are!!!!!!!!!!!

 

[redbrass_ca]

The saw that needs attention is a Husqvarna 36 from 1993. It has been very good to me and most reliable. If I could get a rim drive sprocket for it it would be a better replacement. I don't think it is available for this saw.

T. Papion

 

[TimberPig]

The saw that needs attention is a Husqvarna 36 from 1993. It has been very good to me and most reliable. If I could get a rim drive sprocket for it it would be a better replacement. I don't think it is available for this saw.

T. Papion

Yes, it is actually (in .325, not 3/8LP), go see your Oregon dealer, and he can hook you up.

 

[DGG]

My Husky dealer suggest changing the bar and sprocket after wearing out two chains. I don't know if this is a rule of thumb or not. Probably alot depends on how the chain is treated and tensioned as far as how long a sprocket or bar will last.