Slightly OT: CAT70 scraper

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   Posted this on HeavyEquipmentForum and ACMOC. Any suggestions from here?

Found a loose bearing on the front axle of our CAT70. Went to tighten 
the nut and found that someone has been into this before. The nut is 
very loose on the shaft threads. Decided to pull the stub and see what 
we can do...

Removed the 1" bolt and 5/8" bolt from the axle tube. Cleaned up all the
 grime from around the stub shaft and from the slit in the bottom of the
 axle tube. Knocked a couple of punches into the slit at the bottom of 
the tube to try to spread it open a bit. Put a couple more chisels 
between the axle stub shoulder and the axle tube.

Have been tapping on the axle tube and going at the axle stub shoulder with the air hammer to no avail.

Then cut a piece of tube to fit over the axle stub, a bit bigger than 
the shoulder, to bear against the end of the axle tube. Made a plate for
 the end and carefully threaded the axle nut back on. We have the nut 
fairly snug but don't want to over do it because the threads aren't the 
greatest (the whole reason for this operation!)

Any other ideas?

Andrew

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Andrew_D Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 May 2013 Location: Newdale,MB,Can Points: 148	Post Options Post Reply Quote Andrew_D Report Post Thanks(0) Quote Reply Topic: Slightly OT: CAT70 scraper Posted: 27 Aug 2014 at 8:33pm
	Posted this on HeavyEquipmentForum and ACMOC. Any suggestions from here? Found a loose bearing on the front axle of our CAT70. Went to tighten the nut and found that someone has been into this before. The nut is very loose on the shaft threads. Decided to pull the stub and see what we can do... Removed the 1" bolt and 5/8" bolt from the axle tube. Cleaned up all the grime from around the stub shaft and from the slit in the bottom of the axle tube. Knocked a couple of punches into the slit at the bottom of the tube to try to spread it open a bit. Put a couple more chisels between the axle stub shoulder and the axle tube. Have been tapping on the axle tube and going at the axle stub shoulder with the air hammer to no avail. Then cut a piece of tube to fit over the axle stub, a bit bigger than the shoulder, to bear against the end of the axle tube. Made a plate for the end and carefully threaded the axle nut back on. We have the nut fairly snug but don't want to over do it because the threads aren't the greatest (the whole reason for this operation!) Any other ideas? Andrew
	=================================================== HD11B (S/N: 3880) ~1957

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DiyDave Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: Gambrills, MD Points: 50626	Post Options Post Reply Quote DiyDave Report Post Thanks(0) Quote Reply Posted: 27 Aug 2014 at 8:39pm
	Grind the threads off, and re-thread next size smaller?

chumduffy Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 28 Sep 2013 Location: Smethport, PA Points: 4951	Post Options Post Reply Quote chumduffy Report Post Thanks(0) Quote Reply Posted: 28 Aug 2014 at 4:07am
	Andrew, Hello. Not sure what to tell you, We have had a Cat 435 F sense 1973 however I have never had the need to take a front wheel apart yet!! It has spent most of it's time hooked to a Cat, D8-2U. Lately it has been only used at antique tractor shows. I hope you have as good of luck with your Cat 70 as we have with our 435-F! It has been a excellent piece of equipment! What will you pull your scraper with?, Do you have much work for it? Is your scraper still set up as a cable machine? Operating tractor scrapers was always one of my favorite things to do!! Look forward to your reply. Thanks,Chum....

Andrew_D Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 28 May 2013 Location: Newdale,MB,Can Points: 148	Post Options Post Reply Quote Andrew_D Report Post Thanks(0) Quote Reply Posted: 28 Aug 2014 at 6:42am
	Chum: Ours has been converted to hydraulic. As with most scrapers around here, it is pulled with an ag tractor. Dave: I was hoping to pull the stub shaft and throw it in the lathe to turn the section down and re-thread. Hadn't thought about trying to grind it while mounted.... Andrew
	=================================================== HD11B (S/N: 3880) ~1957

DiyDave Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: Gambrills, MD Points: 50626	Post Options Post Reply Quote DiyDave Report Post Thanks(0) Quote Reply Posted: 28 Aug 2014 at 6:04pm
	Andrew, if you can do it, and if the axle stub has a center hole, and you can find the right sized hole saw, you can do it that way. The trick is in getting the die started straight, so the nut goes on exactly straight. Some times you just don't have the room...