Repacking Cylinders

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77 Ford
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Repacking Cylinders

Post by 77 Ford » Mon Dec 21, 2020 8:15 am

I'm repacking cylinders on my 580c backhoe. The piston bolts are just a huge pain to get loose. I've got a 950 ft pound 3/4" impact and it will not budge them. The last one I did I put a rock bar thru the eyelet, drove over the rock bar with my skid steer and put a 8' cheater bar on my 3/4" break over.

Why does the impact not work, is because you cant hold it from moving and it looses effectiveness? I gotta find a better way to do this, I'm going to run them by a truck repair shop with a 1" gun and see if he can bust them loose.

Any suggestions or ideas would be greatly appreciated.
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Lavoy
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Re: Repacking Cylinders

Post by Lavoy » Mon Dec 21, 2020 8:51 am

Heat the nut some and hit it while it is still hot.
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77 Ford
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Re: Repacking Cylinders

Post by 77 Ford » Mon Dec 21, 2020 9:16 am

Thank you for the quick Reply Lavoy.

Does it change your opinion any because they are bolts ? One has 1 1/2 " head the other 2 3/8".
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Serial #208336T

yellowcrawler
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Re: Repacking Cylinders

Post by yellowcrawler » Mon Dec 21, 2020 11:13 am

I have a 580D backhoe, the bolts are so difficult to break lose because of locktite. The heat will soften the locktite, making the bolt easier to remove. Something else I have done is to connect the shaft back to the machine, with a block of wood under it to protect the shaft, then use the socket, breaker bar and cheater combination to break it lose.
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77 Ford
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Re: Repacking Cylinders

Post by 77 Ford » Mon Dec 21, 2020 11:43 am

He broke them all loose with a battery powered 3/4" gun(rated 1350 ft/lbs) and the eye clamped to 1000 pound workbench. I think the key is getting it locked down solid so you get the impact motion without movement.
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Re: Repacking Cylinders

Post by Lavoy » Mon Dec 21, 2020 3:08 pm

Yeah, doesn't work on bolts. Did you get them to break loose?
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Parts and restoration for antique and late model John Deere crawlers.
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Re: Repacking Cylinders

Post by 77 Ford » Mon Dec 21, 2020 4:11 pm

Yep, see post above.

Now on to packing! I have a 3/4" click torque wrench, makes tightening them quite easy. Just a bugger to get apart.
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Serial #208336T

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77 Ford
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Re: Repacking Cylinders

Post by 77 Ford » Mon Dec 28, 2020 12:08 pm

I decided to try again to get some apart. I drilled a 1/2" hole into the edge flange of a tandem dual trailer I have. I ran a bolt thru with a piece of 3" angle on top to hold it down and my air impact easily took them apart. It's all about having that rod tight to something immovable. I did just receive a 3/4" cordless impact rated at 1500 so I'm in the tall cotton now.
JD- 450C track loader
Serial #208336T

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