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Anyone know JCB telehandlers? Steering problems....

D Nelly said:
Bite the bullet and order them now. I have the $15 for 3 sizes set and they're one of those tools that actually makes you smile when you use them. I did one seal with picks and my fingers just to see how bad it'd be and the difference is huge. It's silly how well they work.
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I ended up ordering them last night, but now sitting here and spreading the rebuild kit out, none of the seals are rigid enough I think I'll need them.

Also ordered a 55mm socket for the rod nut. I don't have anything other than a pipe wrench that will go that big....so I'm on hold again until Amazon delivers on Wednesday.
 
Alright....UPS lost my socket in CA for a day and it finally showed up today. Should have everything I need to get this torn down and back together this weekend.

Running in to an issue with this dowel on the piston though.
1716491755026.png


The manual says it should be threaded and to use a screw to extract it. It's not threaded. :confused:
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The replacement in the rebuild kit is threaded with a 4mm hole.
1716491840846.png



Is there a trick to getting these out? I figured I can just run a tap in to it and thread it myself but don't want to risk breaking a tap if there's a more logical way of getting to it.


I'm kind of glad....I had someone here picking something up from marketplace a couple weeks ago and he knew JCB hydraulics really well and warned me about these dowels. You can't see it until you remove the ring and backup. Apparently it's common for people to not realize they're there and start wrenching on the nut and causing some serious damage. :shaking:
 
Well, that was easier than I expected. I threaded a 3mm tap in to it, which it barely had any bite, and the dowel just pulled right out like a hotdog down a hallway. :homer:

And the rod nut spun right off with the impact. This part is almost going too well....

Well there's your problem. Looks like the issue was all in the gland. The wiper was completely. Shot and just crumbled as I picked it out.
1716498299939.png

Same for the inner seal.
1716498320360.png


The piston seals and rings looked much, much better
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And more good news is that everything in the seal kit appears to be sized correctly.

Only thing I don't like is the original (backup?) ring was a square profile and the one that came in the kit is round.

1716498506298.png


The round matches what's in the pictures of the kit on their site, so it was intentional. I'm just not sure if it's correct for my machine, if there was a revision, or if they just change it because they know it's better.
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Strangely enough, the kit for the compensation cylinder has the exact same size one in a square profile.
1716498646448.png



Why would they use round in one and square in another?


The old one that came off the piston looks perfect and has no visible damage so I'd almost be comfortable reusing it if I thought it were the better option....
 
Grnjp92 said:
Lol I have some. They bend and break. But they are cheap! Lol
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I've never broken any, but I'll bend the shit out of them. And at .99 a set I couldn't give fewer fucks. :laughing:

Most of the time I'd want them to bend vs. break. And in something like this, I wouldn't want them to be super hard so there's less of a chance of scratching the parts.
 
Use the old backup if you can twist it around and it not break. It will be fine if it makes you feel better . It just holds the seal in position
 
bgaidan said:
I've never broken any, but I'll bend the shit out of them. And at .99 a set I couldn't give fewer fucks. :laughing:

Most of the time I'd want them to bend vs. break. And in something like this, I wouldn't want them to be super hard so there's less of a chance of scratching the parts.
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Oh I've done both. Straightened out a L shaped one. And snapped straight one😆 but at 99 cents I just grabbed a new one. Lol
 
bgaidan said:
I've never broken any, but I'll bend the shit out of them. And at .99 a set I couldn't give fewer fucks. :laughing:

Most of the time I'd want them to bend vs. break. And in something like this, I wouldn't want them to be super hard so there's less of a chance of scratching the parts.
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Grnjp92 said:
Oh I've done both. Straightened out a L shaped one. And snapped straight one😆 but at 99 cents I just grabbed a new one. Lol
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Years back, I snapped off a Snap On right-angle pick. I wasn't pissed; I was loading it at ~5X anything reasonable. In my defense, I was pissed and in a hurry :flipoff2:

The Snappy picks act like tempered tool/spring steel, while the cheapies act like . . . paper clip wire. In a way, the "shitty" picks are great because they'll let you know you're asking too much and make you rethink long enough to figure out a more responsible tooling solution. However, the "good" ones will take 4X the overload / abuse like a fookin' champ :grinpimp: (but not 5X, ask me how I know :homer::laughing:).
 
ExWrench said:
Years back, I snapped off a Snap On right-angle pick. I wasn't pissed; I was loading it at ~5X anything reasonable. In my defense, I was pissed and in a hurry :flipoff2:

The Snappy picks act like tempered tool/spring steel, while the cheapies act like . . . paper clip wire. In a way, the "shitty" picks are great because they'll let you know you're asking too much and make you rethink long enough to figure out a more responsible tooling solution. However, the "good" ones will take 4X the overload / abuse like a fookin' champ :grinpimp: (but not 5X, ask me how I know :homer::laughing:).
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They are not happy when you grab them with a pair of pliers to add a force multiplier. Lol
 
ExWrench said:
Years back, I snapped off a Snap On right-angle pick. I wasn't pissed; I was loading it at ~5X anything reasonable. In my defense, I was pissed and in a hurry :flipoff2:

The Snappy picks act like tempered tool/spring steel, while the cheapies act like . . . paper clip wire. In a way, the "shitty" picks are great because they'll let you know you're asking too much and make you rethink long enough to figure out a more responsible tooling solution. However, the "good" ones will take 4X the overload / abuse like a fookin' champ :grinpimp: (but not 5X, ask me how I know :homer::laughing:).
Click to expand...

Even going with the Icons at HF, I can't justify $20 for those when these are .99 on sale. And technically they have a lifetime warranty...though I don't know if I'd feel right warrantying them for .99 after clear abuse. :laughing:
 
Yeah. The orange shit isn't perfect but it's cheap enough to make up for it.


bgaidan said:
though I don't know if I'd feel right warrantying them for .99 after clear abuse. :laughing:
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Yet I somehow feel ok warrantying out a dead blow hammer every year that's just worn out from hitting metal shit all the time.:laughing:

Always takes me a few seconds. to figure out which one to grab off the shelf because mine looked so different.
 
arse_sidewards said:
Yeah. The orange shit isn't perfect but it's cheap enough to make up for it.



Yet I somehow feel ok warrantying out a dead blow hammer every year that's just worn out from hitting metal shit all the time.:laughing:

Always takes me a few seconds. to figure out which one to grab off the shelf because mine looked so different.
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I had thrown at least 3 or 4 of those away before I was in the store one day and it dawned on me that they have a lifetime warranty. :laughing:
 
Well, I THOUGHT I had all the parts in but realized I never got the new pin. Checked tracking and it sat at the PO in FL since last friday. Finally moved overnight and got scanned nearby so I'm assuming I'll get it with tomorrow's mail.

But, today I got the cylinder rebuilt and installed and the boom and wear pads and a temporary pin so I could run the boom in and out. So other than the pin and a couple hoses to reconnect on the carriage, she's pretty well buttoned up. I'll just need to cut and chamfer the pin when it shows up and hopefully it'll go right in.


Then I get to do it again on the compensation cylinder....but that one should be much easier.
 
how much torque did the rod nut call for, and how much did you give it?

That cylinder probably doesn't see hardly any abuse at all, so getting that nut stinking tight probably isn't a priority.
 
Muckin_Slusher said:
how much torque did the rod nut call for, and how much did you give it?

That cylinder probably doesn't see hardly any abuse at all, so getting that nut stinking tight probably isn't a priority.
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They actually have very little torque and are instead retained by the dowel.

I hit it with the impact until it was tight and then had to back it off a couple degrees to line up the dowel hole.
 
ExWrench said:
3gcbh4d.gif


You just had to go & jinx it :shaking: :homer:

Welp, at least we get 4 more pages :flipoff2:
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Well, I did fuck myself, but not in the way expected. :mad3:

The pin one this one came right out with a couple moderate taps. Luckily it appears to be the same dimensions as the boom extension so the wrench I made for the gland worked perfectly and so did the socket for the piston nut.

But...I lifted the boom to make room to pull the rod out and fluid started PUKING from the back/inside of the boom. Looks like my seal job has already failed...or so I'm assuming. Gonna have to pull the boom back apart and see what's going on. The only other possibility is that the lower part of the boom where it transitions to the carriage could have just been completely full of oil from the previous failure and this is the first time I've had it tilted fully up in the air since that happened. But, can't test any theories until I get the compensation cylinder back together since it'll just puke all over if I move the boom wit the rod out.



So, back to rebuilding this compensation cylinder. Since this one is almost identical to the last, I guess I can use this opportunity to make sure I didn't fuck up the orientation of the seals on that one. I'm also questioning the contents of this kit as I have at least one extra seal that I didn't come out of the old parts and the inner gland (rod?) seal is also a little different.


Brown one is what came out of the gland. Blue is what matches up in the rebuild kit.
1716666862294.png

1716666876907.png

1716667094979.png


Somewhat different profiles, but I'm assuming the new will serve the same function?


Also, for orientation, am I understanding this illustration correctly that the concave face of the seal (the one in the first pic above) goes to the pressure side?
1716667139661.png


Same question for the wiper. Just like the other cylinder, the wiper was completely shot and disintegrated as I pulled it out so I can't compare new to old. The blue is the wiper.
1716667523352.png

1716667532736.png


This side faces in, toward the pressure?
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And finally, I have no clue what the orange seal is for. It doesn't match up to anything that came out of the old one. It's the right diameter for the rod, but I don't see any place where it could have fit, unless it stacks on the wiper somehow. Or could it be an alternate style of wiper for a slightly different cylinder?
 
Cups twards pressure. (top pic facing you is fluid). Wiper goes reverse, to keep stuff out.
 
Hard to tell in the pic because different profile. I wouldn't sweat it in that application. The gland seal is the important guy.
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I'm pretty sure I had it right....all the pics I'm finding only shows that raised lip pointing outward.

1716669804814.png
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That would put this face out.
1716669908240.png
 
One thing I'm not liking, when I look at some rebuild kits from other vendors some of them have this style piston seal with the o-ring reinforcement. I feel like this would hold up better.

1716672857106.png
 
OK, crisis averted. :laughing:

Got the comp. cylinder back together and reinstalled. Amazing how much easier when it's a passive cylinder with no load on it...and you don't have to remove a boom to get to it. :lmao:


So I got it back together and fired it up and watched.....nothing coming out of the boom. Ran the boom in and out and up and down. Still nothing.



So I'm gonna stick with my previous alternate theory. The front lower section of the boom must have filled up with oil and I hadn't raised the boom after it really started puking and I shut it down.


There must have been a good gallon and a half of juice in here that couldn't escape until I raised the boom high enough for it to dump out the back. :laughing:
1716676817812.png
 
Dethmachinefab said:
That's a loaded u-cup. You will be fine with what you installed.
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Good to know. I'd probably go with that style if I were ordering again, but the place I ordered these from does seem to know their shit so I guess I can trust their judgement.



I'd still like to know what this orange seal is for. Only thing I can guess is this kit crosses to various other JCB machines. I think I saw it listed for a backhoe bucket and a loader, so maybe it's just a universal kit with an extra part that doesn't apply to my machine. 🤷‍♂️ Either way, I didn't see any place for it on my machine so into the fuckit bucket it goes.
 
Usually got a bunch of extra parts with the aftermarket kits when I was doing them on my case stuff. One kit did a ton of different machines.
 
Dethmachinefab said:
Usually got a bunch of extra parts with the aftermarket kits when I was doing them on my case stuff. One kit did a ton of different machines.
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Pretty much what I decided. I just hate having extra parts when rebuilding something. :laughing:
 
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