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case 780 b backhoe hydralic cylinders piston nut torque

M

mrhud

Member
i amrepacking the cylinders on a 780 b hoe i am starting with the stabbilizer cylinder s any one know what the torque for bolt on the end of the rod for the piston i takes a 1 13/16 socket i have not got the bolt out yet to see the thread size or pitch thanks hud
 
Bolt? That would be a nut on the rod end piston. And I am sure u
don't have a torque wrench for it anyhow. Good and tight
is good. You would need a 4 ft pipe to tighten it. Be min.
700 ft lbs. but closer to 1000 or more from
Experience. It is not going to loosen anyhow. Even use
blue locktite if you want.
 

rustred,

Case, and others, used bolts in some rod ends.

mrhud,

Good luck, I hope you have some good tooling. You might get it apart with a slugging wrench, but setting the torque on assembly will be difficult. Also, you need to hold it without damaging the rod surface.

The bolt is a 1-1/4"-12 TPI grade 8 bolt according to the parts book. I suggest the proper Case manual for your machine is your best source for the torque Case designed for in this application. A generic torque chart shows 1509 Foot pounds for a lubricated bolt, 1811 foot pounds for a zinc plated bolt, and 2012 foot pounds for a dry bolt.

You might consider taking the rod and parts on it to a shop with tools to work on it and have them remove the bolt, restore the parts needed with the bolt removed, then reassemble the rod and torque the bolt to the proper torque. Then you can reassemble your cylinder.
 
(quoted from post at 04:41:38 10/24/23)
rustred,

Case, and others, used bolts in some rod ends.

mrhud,

Good luck, I hope you have some good tooling. You might get it apart with a slugging wrench, but setting the torque on assembly will be difficult. Also, you need to hold it without damaging the rod surface.

The bolt is a 1-1/4"-12 TPI grade 8 bolt according to the parts book. I suggest the proper Case manual for your machine is your best source for the torque Case designed for in this application. A generic torque chart shows 1509 Foot pounds for a lubricated bolt, 1811 foot pounds for a zinc plated bolt, and 2012 foot pounds for a dry bolt.

You might consider taking the rod and parts on it to a shop with tools to work on it and have them remove the bolt, restore the parts needed with the bolt removed, then reassemble the rod and torque the bolt to the proper torque. Then you can reassemble your cylinder.
Click to expand...
thanks we have a fixture for mounting cylinder rods to torque the nuts and work on the glandstis one will be at the end of our torque ing capabilitys we can go to 1900 lbs i will call our local case dealer and have them look up the specs today
 
(quoted from post at 08:48:53 10/24/23)
(quoted from post at 04:41:38 10/24/23)
rustred,

Case, and others, used bolts in some rod ends.

mrhud,

Good luck, I hope you have some good tooling. You might get it apart with a slugging wrench, but setting the torque on assembly will be difficult. Also, you need to hold it without damaging the rod surface.

The bolt is a 1-1/4"-12 TPI grade 8 bolt according to the parts book. I suggest the proper Case manual for your machine is your best source for the torque Case designed for in this application. A generic torque chart shows 1509 Foot pounds for a lubricated bolt, 1811 foot pounds for a zinc plated bolt, and 2012 foot pounds for a dry bolt.

You might consider taking the rod and parts on it to a shop with tools to work on it and have them remove the bolt, restore the parts needed with the bolt removed, then reassemble the rod and torque the bolt to the proper torque. Then you can reassemble your cylinder.
Click to expand...
thanks we have a fixture for mounting cylinder rods to torque the nuts and work on the glandstis one will be at the end of our torque ing capabilitys we can go to 1900 lbs i will call our local case dealer and have them look up the specs today
Click to expand...

Sounds like you are good to go once you get the actual Case spec.
 
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