HT 101 Polesaw help needed.

[angelo c]

Never worked on one before. Got one with a bad chain drive sprocket and cant get the "collar screw" loose to change it out. Any ideas if its maybe left hand threads for some reason and is there a trick to removal as the sprocket turns with the screw as you loosen ect.
thanks.

a Service Manual might be of help but I can't dig one up.

 

[RI Chevy]

@ray benson

 

[67L36Driver]

Attempted to change the sprocket on my HT75 myself.

Discretion being the better part of valor, I paid the Stihl dealer $15 to do it. John reported it took two guys, the big bench vise and a cheater pipe to do the job.

I could have turned the head into a POS working by myself. [emoji6]

 

[RI Chevy]

Gotta just eat your Wheeties and cowboy up. Lol
Maybe.

 

[Lightning Performance]

They can a real *b-word to get off. I just lock it in a vice with some wood added for jaws. If the sprocket is junk lock it down. That screw takes a bit of heat and cooling sometimes to get it free. Last sprocket screw I removed, was sure it would snap but did not.
@angelo c

 

[angelo c]

They can a real *b-word to get off. I just lock it in a vice with some wood added for jaws. If the sprocket is junk lock it down. That screw takes a bit of heat and cooling sometimes to get it free. Last sprocket screw I removed, was sure it would snap but did not.
@angelo c

So it's definitely "right hand" threads. And i should use "stage 2" screw removal techniques. ..steve (lone wolf) suggested an impact driver with a "bit of effort" as stage 1.... I don't see anything in the IPL that would be damaged by "stage 3" heat that mutha up real good attempts .
Dying to see what the service manual suggests.

 

[67L36Driver]

IIRC the IPL lists a tube of red Locktite for the cutting head. [emoji848]

 

[Onan18]

I had to put a set of King Pins in an old Ford L9000 one time. The service manual read "Remove the retaining bolt and gently tap the old King Pin out with a brass hammer."

 

[angelo c]

Kinda odd as how Stihl uses mostly T27 in high pressure fastener areas...this is a flat head screw ? In an area that should be fairly easy to access in the field. Changing a drive sprocket shouldn't require an oxy acetylene torch set-up in the woods.

 

[angelo c]

So a google search comes up with a SM and here's the suggested method....
are ya ready fer it ?

Go to an authorized dealer to have it serviced/replaced