520H resto problem - advice needed

[tbirdsteve 11]

Hello All, I am trying to disassemble a part on my 93 520H. Sorry, I don't know the technical term for the piece but connects to the deck to lift it up or lower it. I have removed the pins and blasted the whole assembly but I find I need to blast it piece by piece separately to get the prep I'm looking for. I see the piece has a keyway in it as well. I've tried moderately heating it but it won't budge. I just want to ask the group if these are notoriously hard to separate and not worth the effort or perhaps I need to heat it more cos it's probably rusted together. Thanks in advance for any advice. 

Edited November 4, 2020 by tbirdsteve
spelling error

[Handy Don 12,662]

Can only help with the "technical" name.  Its a rock shaft.

Have never had a need to get one of these out but I'll steal @ebinmaine's line.  Penetrant, heat, patience.

[ebinmaine 68,887]

All of the machines in our own herd are older so I'm not familiar with that setup but it's important to remember that it took decades to rust in place so be patient with it. 

 

 

4 minutes ago, Handy Don said:

I'll steal @ebinmaine's line.  Penetrant, heat, patience

 

Well done Don!

 

@JCM have you shredded one of these?

How's it come out?

 

 

[Handy Don 12,662]

Faced with having to get this apart, and the aforementioned process yielding no results, I would clamp the flanges of two pieces of 1.25x1.25 angle iron or 1.5x1/4 bar stock to the shaft on the lever side of the bushing firmly but not too tight (this will need to slide along the bar--add some grease bar-shaft touch point). I'd keep the bars parallel by clamping their ends together with 3/4" spacers (i.e the thickness of the rockshaft).

Then apply the arms of a large 2-arm gear puller (or fab'd up equivalent) to the angle iron ends and set the screw against the rock shaft on the outside of the frame on the side away from the levers. I'd plan for it to take a few days adding penetrant, episodic heat, and steadily increasing pressure along with a few taps on the bushing with a small hammer.

 

[76c12091520h 3,687]

Good luck ! I feel your pain in wanting to get every last piece properly cleaned and detailed, but unless you absolutely need to take this out I would leave it in place. I tore down about 10 parts tractors this season, along with my own 520, and I can honestly say that I had about a 50% success rate getting these out! The greasy , grimy tractors weren't bad , but the dried up rusty ones were a lost cause. Several of them I ended up cutting the consoles apart and putting the rockshaft in a 20 ton press to get them apart ( and I typically start soaking my parts about a month before their scheduled teardowns- steering wheels, hubs, rockshafts, etc. ) 

[daveoman1966 3,762]

Inasmuch as you've sandblasted the hoodstand with the bell-crank (rockshaft) in place, I've no doubt that the blasting sand has gotten in to each of the side bushings.  Given that, IMHO, you've no alternative but to get the bell-crank out at all costs.  If not, the sand will grind away at those two bushings leading to premature failure.  

ps...  I have that shaft and bell-crank available if you destroy your getting it out.

 

[tbirdsteve 11]

Thank you everyone, I'll get them apart now I know it can be done. Daveoman1966 the bushings are perfect, no sand in them, the whole assembly was sodablasted, that's why the pitting is rusting again. 76c12091520h that is exactly the standard I am chasing, thanks for the encouragement. It gets expensive bringing parts from the US but I'm committed. These are extremely rare here. Thanks again to everyone that commented, I'll be following everyone's advice. 

[ebinmaine 68,887]

15 minutes ago, tbirdsteve said:

Thank you everyone, I'll get them apart now I know it can be done. Daveoman1966 the bushings are perfect, no sand in them, the whole assembly was sodablasted, that's why the pitting is rusting again. 76c12091520h that is exactly the standard I am chasing, thanks for the encouragement. It gets expensive bringing parts from the US but I'm committed. These are extremely rare here. Thanks again to everyone that commented, I'll be following everyone's advice. 

Keep us posted on your progress please!!

[AMC RULES 37,141]

You'll have to simultaneously heat both sides of the shaft red hot to break the rust bond before it will move. 

[Pullstart 63,204]

If you move to the heat method, get you some paraffin wax to melt into the bond.  It’ll penetrate like solder when you sweat copper together and help lube it all as it comes apart 

[peter lena 8,877]

being a lubrication nut , I find just regularly aerosol lubricant spraying , lets parts and pieces "  WORK  WITH MOVEMENT ". interesting that w/h  parts that I have gotten , that were not lubed , were rusted to the point of snapping off rather then breaking free. very easy to prevent that , pete 

[tbirdsteve 11]

ebinmaine, AMC RULES, pullstart and peter lena thank you for your additional input. Hopefully soon I will post a pic of a successful outcome. Cheers. 

[Pullstart 63,204]

19 minutes ago, tbirdsteve said:

ebinmaine, AMC RULES, pullstart and peter lena thank you for your additional input. Hopefully soon I will post a pic of a successful outcome. Cheers. 

Good deal!  Say Hi to tomorrow for me!

[ebinmaine 68,887]

11 hours ago, tbirdsteve said:

ebinmaine, AMC RULES, pullstart and peter lena thank you for your additional input. Hopefully soon I will post a pic of a successful outcome. Cheers. 

Keep us posted. Any more questions, just ask.

 

 

[Damien Walker 246]

Bit late to the party and so I imagine you will have moved on from this....

 

I'm coming to the end of the restoration of my near identical 518H and experienced the same problem. My console was in poor condition due to the previous owner taking no care over the machine. It was kept outside with no cover, covered in grass clippings (which retained the rain water) and much rust damage occurred...including seizing the rock shaft. All the above advice is good: heat, WD40, paraffin etc but mine still refused to budge. Part of the problem is access to hit the lever section square on. Mine came out by use of an air chisel....they are quite violent and the high repetition rate did it. A small amount of metal bruising occurred and the arm I was chiselling against, bent a little, but all this collateral damage was easily tidied up. Reassemble with grease. I used copper slip and I hope it will come apart easily next time.

[ebinmaine 68,887]

27 minutes ago, Damien Walker said:

Bit late to the party and so I imagine you will have moved on from this....

 

I'm coming to the end of the restoration of my near identical 518H and experienced the same problem. My console was in poor condition due to the previous owner taking no care over the machine. It was kept outside with no cover, covered in grass clippings (which retained the rain water) and much rust damage occurred...including seizing the rock shaft. All the above advice is good: heat, WD40, paraffin etc but mine still refused to budge. Part of the problem is access to hit the lever section square on. Mine came out by use of an air chisel....they are quite violent and the high repetition rate did it. A small amount of metal bruising occurred and the arm I was chiselling against, bent a little, but all this collateral damage was easily tidied up. Reassemble with grease. I used copper slip and I hope it will come apart easily next time.

Good ideas and input there. Thanks for sharing!