Case gland nut screw

[caver]

I'll use Messick as an example.

https://www.messicks.com/parts/new-holland/86642312

When you rebuild a Case backhoe hydraulic cylinder this is a screw for the gland nut. It's a No #8 -32x3/8 thread cutting screw (type F steel). I have one screw I may have messed up. Most places want crazy money for one screw. part #187-1524 or also 86642312. I did find a similar type screw on Grainger where it was like a few bucks for 100 of them.
What the repair manual tells you to do is after a rebuild tighten gland nut then drill a new hole right where the threads meet. Reuse screw. I've seen people in videos just line the two hole halves up and call it done but I've always found them way off. WE have a case AG dealer in town. I may swing by there out of curiosity or just call the area Case Construction dealer. The official Case website shows them out of stock. I have 4 cylinder leaks that have been neglected since I have not really needed the backhoe. I got one rebuilt after much aggravation and the swing cylinder I could not get the gland nut broke loose. It's hard to whack the threads which usually solves that problem. I may have to crawl under hoe and pull the other pin to remove cylinder assy. Sometimes I find it just as easy to rebuild cylinders while partially attached to machine.

 

[TractorTech]

Have you tried heating the gland on the cylinder?

As far as the screw goes, I would use a Alken head or hex socket set screw something like the pictures here.


You might try McMaster Carr for that screw or just get a set screw as described at a good hardware store.

 

[caver]

I tried a little heat but very little from a propane torch. Being still attached to the tractor makes me a little nervous. I've seen a lot of toasted backhoes and heavy equipment and can only assume something caught the hydraulic oil on fire. I saw guy said (YT?) he used a air hammer with a blunt end to free up the rusted first couple threads. I was reluctant to crawl under only to get a hydraulic bath or ticks. Have sprayed for ticks and have some big pieces of saved cardboard to lay on. I'll tackle it again when i go back over there. I just found out Home Cheapo carries Pig mat rolls.

 

[true temper]

I wouldn’t worry too much about replacing the screw as tight as the gland nut is it’s not going to back out.

 

[Sawyer Rob]

I'd red loc tite it and forget about get...

SR

 

[DJ54]

All of the ones in my Case 480C look like this. I rebuilt both swing cylinders on it about a year ago. For each cylinder I swung it about 2/3 left or right to expose as much of the cylinder as possible. Removed the screw, then "tried" the gland nut wrench to break the nut loose. Ended up putting a large pipe wrench with cheater on it to break the nut loose. Once it broke loose it turned fairly easy, then used the gland nut wrench to remove it. Had to file off where the pipe wrench bit into the nut.

When installing I used the gland nut wrench to install up to a certain point, then back to the pipe wrench to get the half holes to align again and installed the screw.

Apparently, someone had been into it before, and I found the piston bolt this loose (pic below) on the right side. Left side was loose but not backed out like this. This is where you need to clean them up and use Loc-Tite on the threads (I used orange) then torque to 450 ft. lbs. per the repair manual. I don't have a torque wrench that goes that high, but do have a new air impact that delivers 750 ft. lbs. so set it on #2 setting, then on #3 for a second. Figured with the Loc-Tite on the threads it ought to be good.

If you don't have an internal O-ring installation tool I'd highly recommend getting a set. You can get them for under $20 on amazon, or ebay. It sure makes installing that internal O-ring a snap.

 

[caver]

Case manual says blue loctite on the piston bolt. In the past I've used a torque multiplier but this time I did not have my torque wrench with me. So, I put my battery impact on it longer than normal.I've rebuilt several cylinders on said machine and yes the seal twisters are handy.