Max IV right rear sprocket puzzle

[snackmaster]

a puzzle to me anyway...lower set screw is frozen, broken allan wrench tip in set screw hole, sprocket/hub still has 1/2in left to right movement. what does this movement mean if screw is frozen in place?

[Mike]

The set screw may not have been very tight to the axle but it still rusted in place to the sprocket. It may have a small groove worn on the axle where the set screw is. That would allow it to slide back and forth.

[CBass]

I had to change out my axles because of the movement. It caused the sprocket to ware out the splines of the axle in spots. Remember to heat up set screws before trying to remove due to Loctite.

[msafi65]

I usually see the tip of the screw broken off. I groove the axles to accept the snaprings used in later models. If the sprocket is still usable , drill next to the set screw to free it up. I don't groove the axles to factory depth of .034". I only cut to .015 " and find the snaprings stay put fine while not weakening the axle. If the vehicle has 2 seperate rear sprockets and are still usable,I face them together with a spacer and weld together making one unit. Another fix is retain the sprocket with clamping collars. You can put split collars on a loose one if you arnt going to remove it to replace bearings ect.

[snackmaster]

think i'll try to drill out screw first, what type of bit should i use? also, where can i get clamping collars?

[john swenson]

mcmaster carr sells clamping collars. check online and make sure to get the 2 piece camping collar. i have used them to hold sprockets to the axle. just clamp the collar next to the sprocket and then weld just one half of the collar to the sprocket. that way you can still slide the sprocket off the axle if needed later. good luck, j.b.

[snackmaster]

Spot on again Mike, nice groove worn into axle...PO tried to remove screw, made a mess, then tried to bury it with other screw. Cost me many hours to drill out

[philipatmaxfour]

---rear sprocket puzzle

Spot on again Mike, nice groove worn into axle...PO tried to remove screw, made a mess, then tried to bury it with other screw. Cost me many hours to drill out

Believe it or not, the one set screw buried beneath another set screw is usually factory ,not p.o.