Loader Bucket Cylinder Repair Help

[moojamboo]

I ordered the repacking kit for my Ford 770A loader bucket cylinder. i managed to get the cylinder off the tractor. I was following the instructions i have in the loader manual but I'm having difficulty moving the cylinder shaft.

This is what the cylinder looks like now.

I can't seem to push or pull the cylinder at all. I was able to rotate the cylinder shaft with a metal bar through pin hole in the top end of the cylinder tube with a clamp holding the tube while i rotated the shaft. i tried moving the shaft in by using a small sledge hammer and a block of wood and nothing seemed to move.

Any advice welcome as you can see here the second step in the instructions says to push the shaft in all the way.

I have read that others have done this job in little time and my local dealer told me it would be a morning project. i have spend 2 hours trying to figure out how to move the cylinder please help.

 

[kennyd]

It should move...You did get the wire retainer out?

You can try hooking a air hose to the base of the cylinder to see if it will move. If it is really stuck then it may indicate a bent rod.

Why not post in the hydraulics forum?

 

[moojamboo]

I did take the retainer ring out. but that didn't come out the way the manual says. the manual said i could just rotate the head and the wire would come out. but i actually needed to pull the ring out. the head moves freely on the cylinder but the cylinder shaft won't move.

I will post this on the hydraulic form as well.

 

[sizzami]

typically the retainer clip set up like ours is removed by placing a screwdriver in the groove and using it to start the ring up out of the groove then turn the head and the ring shoul just walk out of the hole the , its messy but you could allways hook the tractor hoses back up to the cylinder and use it to push the rod out be careful though , because there will be air in the cilinder , air pressure may work if the resistance is less than about 90 psi but compressed air will yield a very sudden movement

 

[wdchyd]

Yea, that rod should twist with no trouble if it's not bent.....Using compressed air is dangerous cuz when/if it launches it could sent it across the room without the retainer in place......

Best to get a piece of steel stock for the rod eye and beat it out with BFH (big freakin' hammer)......if'n that don't work you'll need to hook it up to tractor for some liquid persuasion.......

If the gland head only moves the the distance of the thickness of the wire, then you have a burr inside the cyl barrel.....then "Bull Strength & Ignorance" will be on the adjenda......

 

[wdchyd]

BTW,

Is that cross tube tweeked or is it just an optical illusion.......

 

[wdchyd]

Also, you only need to push rod all the way in when reassembling to tighten the piston (after all is back together)....otherwise the piston head will either go together too loose or too tight......

To take it apart you need to extend hyd rod all the way out then whack it with the BFH with the scrap steel stock in cross tube (don't hit the chrome part......)

 

[moojamboo]

So the manual says to unscrew the cylinder shaft from the compression nut and then slide the cylinder shaft out and then the compression nut and vpack one at a time. if i use a BFH and try to drive the shaft out will i damage the compression nut assembly?

 

[wdchyd]

You need the piston (compression nut) to be on while you're yanking the assy apart.....otherwise you won't have anything to slam the gland from the inside to remove it.......that's what the scrap steel (in cross head) and the BFH is for......(after all the lock wire is out)

The hyd rod, gland, and all the seals will come out in one clean swipe.....then put cross head in vise and loosen piston head to expose all the rest of the seals......it'll come to ya as you start taking the thing apart at the vise...

the "Compression nut" or piston head is tightened only after the assy is back together to tweek the packings tight when you're done......

 

[wdchyd]

Where in Northern VT are you.....I have a few accounts up there....one in Derby (IIRC)....Guay Repair Service....

 

[moojamboo]

I am in underhill Vt.

Thanks for all the advice. we finally hooked up the cylinders to the truck and a piece of our fence post and pulled it apart. now we can't seem to unscrew the compression nut. i think we need a special tool for that. there a re four holes in the top of the compression nut that look like they might be for a special tool to take the nut off.

I might have to call my local dealer and find out how much it will cost for them to take the cylinder apart for me. Unless anyone else has had luck getting the compression nut unscrewed.

 

[beeforty]

I beleive that the 4 holes are for loosening the compressin nut with a punch or equivalent. I have a 768 loader, same kind of set up and you need to BACK OFF the nut but don't take it all the way off. Otherwise you have pieces inside the tube You are taking the compression off of the seals so they will come out. I have changed seals on 3 of my cylinders and I didn't have much problem. Tricky part is putting a pin thru the hose fitting like as shown in the picture that you get with the seal kit you have posted. You don't want to damage the threads. Unscrew the jamb nut like a bolt by turning the rod end with a cross bar thru the pin hole until it is loose in the bore and it should slide out. I did have some rust in the ring groove, may be making it hard to pop off. Also pay attention to which actuator you are working on because the raise and dump cylinder on mine are the SAME:confused2:but the seals go in OPPOSITE:confused2: It has been a while since I have had to do this but it wasn't to bad for me. I still have an extra set of seals waitng for the 4th cylinder to start leaking:laughing:

 

[wdchyd]

You can put the piston in the raw vise then use the cross head with another chunk of steel to unscrew, then after file off the vise marks (they won't hurt anything)

Easy to unscrew......just remember to use loctite when reinstalling to keep piston from loosening up.....

 

[Richard]

Probably a dumb question... but as someone who is thinking on redoing my own I also wondered how to pull the rod out.

Ultimately, I thought it would be easy... leave one end attached to the machine and attach a come along or something similar to the other end and "simply" ratchet it out.

Is that a viable plan or is there something wrong with that logic?

 

[wdchyd]

Not a dumb question but every cyl has its own quirks.....Some fall apart and some need a nuclear bomb to disassemble.....:laughing:

At the very least you'll need a good anchored vise....