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hi, i am new to the site along with these machines. i have a max iv that i am restoring.i have the main drive sprockets that need to be replaced. my problem is i cant get the axle out. i have tried everything. my last option is to cut the axle and make a new one. any suggestions thank you.
i had to drill out the allen head screw in the coller i broke the wrench off inside trying to get it out. i have taken the bearings loose on both ends and the bot that runs through the sprocket shaft and axle is removed. i can tell that the axle is stuck in that coller but i have soaked it for a week in wd-40 and heated it up and nothing
WD-40 is a poor penetrant. PB-Blaster is a great way of getting stuff freed up. Even with PB blaster, soaking doesn't always do the trick. Often you need to do a combination of heat/hammer/soak. When we say heat, we mean HEAT. A propane torch doesn't always get hot enough. If you have it available, get an oxy-acetylene torch in there and do some damage.
I'm confused by your post. Do you have the axle out, or is the end of the axle still stuck in side one of the collars? Does the sprocket move freely on the axle shaft after you took the bolt out? With really stubborn sprockets that are stuck to axle shafts, I put a large pipe wrench on the drive sprocket (inside the tub), get it friggen' HOT (not "cook an egg" hot, more like "strip a valence electron from its outer shell" hot) and turn the axle with another pipe wrench from outside the tub. Keep hitting it with the penetrating oil as you do it. PB has a really high flash point, so don't worry too much about fires.
The parts have to come apart somehow. Even if you end up cutting the axle, it's just a piece of steel. They're still making steel these days.
liflod has the right idea. a Dremel with those little cutting wheels are amazing. They get in places a big grinder with a cut off wheel can't. for such a small wheel they cut reasonably fast.
Hydromike's way also works. just have the garden hose ready if the body is poly and starts to burst into flames, run.