Jump to content
Sign in to follow this  
520H4me

Snowblower attachment sprocket problem

Recommended Posts

520H4me

I have a 520H with a mid eighties snowthrower single stage blower. The woodruff key falls out because the sprocket woobles on the shaft. I don't know if I need to replace the sprocket, shaft or both. All I know is this is a questionable design. I need to fix it so it is rock solid reliable. Any suggestions?

Share this post


Link to post
Share on other sites
 
MikesRJ

1) First you need to locate a NEW Woodruff key of the appropriate size, in order to do the next steps.

2) Place the Woodruff key into the pocket hole in the shaft, check to see if the pocket hole is worn or damaged relative to the size of the new Woodruff key.

3) Check the width of the key against the Slot in the Sprocket to make sure the slot has not been worn or damaged. Walls and floor of the slot must be flat and square to one another.

In each case above the fit between Woodruff key and the part must be a close-fit (+.005) to slightly snug (-.001). If any of the above tests fail, the associated part must be replaced.

Share this post


Link to post
Share on other sites
 
Forest Road

If that doesn't work . Weld the sprocket to the shaft.

Share this post


Link to post
Share on other sites
 
Shuboxlover

Are there set screws that need to be tightened?? :ychain:

Share this post


Link to post
Share on other sites
 
520H4me

Really wish it was just loose set screws. Tried welding the thing, but my little wire feed Hobart welder does not get enough penetration and the welds just snap.

I wonder if I could put in a new woodruff key - then use a lock collar to butted up against the sprocket to keep the key in place. Worth a shot...

Share this post


Link to post
Share on other sites
 
520H4me

Went to Fleet Farm. They do not have an OEM sproket, but you can purchase a hub and sprocket that will work (you do have to weld the hub to the sprocket yourself). That setup cost around $10. This time I will use Locktight on the set screws so the key doesn't fall out and I should be ok.

Share this post


Link to post
Share on other sites
 
Kelly

Those build you own sprockets and pulleys are nice.

Share this post


Link to post
Share on other sites
 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×
×
  • Create New...