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  1. R

    JD 790 Sprockets?

    It is no longer a production machine - hours are variable, given my amount of free time, and projects at hand - could be just a few, or a hundred or so. I have found new sprockets, they should be here this week. I will keep my old ones, and possibly build them up with weld. I am sure that the...
  2. R

    JD 790 Sprockets?

    I've talked to a few folks and they recommend not going the weld in clip route, on account of that changing the pitch. They say it would be better to weld on the sides of the teeth on the sprocket, and not in the valley. When I talked about changing the pitch, I was thinking that we would get...
  3. R

    JD 790 Sprockets?

    I talked with a local track shop, and they suggested re-rimming the sprockets - going from 22 teeth to 21 teeth - they were concerned about keeping the same pitch - is there any real reason to do so? They also mentioned that many folks will only do sprockets say every other chain on an...
  4. R

    JD 790 Sprockets?

    My U/C is wore out. I've thrown the tracks on my 790 a few too many times. The last time I noticed the holes in most all of the bushings, so I pulled the other one, coiled them both up, and got them ready to move. Then I went to pull a sprocket off...... Looks like the final drive has to...
  5. R

    Trick behind track chain splitting?

    OK I saw John's other post with the pictures, so I understand now. Thanks! Rodney
  6. R

    Trick behind track chain splitting?

    That's right...... I assume they fit real loose into the next link where they protrude..... So you'd have to get the pin out, and then remove the bolts for the link/shoe on the one side and take it off like that...... can you just cut the bushing with a sawzall then, or does a guy need the...
  7. R

    Trick behind track chain splitting?

    The rollers are not sloppy in their fit onto their shaft. I bought this thing for a steal with a tired motor, and it sorta looked like the top rollers were just replaced, but I could be wrong. How does a guy take a link out - Just like the method described before - blow out the center of the...
  8. R

    Trick behind track chain splitting?

    Yea, this U/C is pretty well shot. I think the adjustment is close to the end, if not already there, and that makes me wonder about the pins/bushings. I had not thought about the upper carrier rollers at all - You're concerned about them being not near as tall in roundness as they used to...
  9. R

    Trick behind track chain splitting?

    I did not pull the adjuster and spring assembly, cause the idler was still adjusted to where I had put it - all the way out. The block for the idler rides in it's own track on the track frame, and that was protruding about 1/4 inch before and after the track got loose. I was having lot of...
  10. R

    Trick behind track chain splitting?

    Not sure how I was making a tough job harder, other than trying to go the wrong way. However The pin came out with persuasion from the sledge, and the idler is now laying on the ground..... and everything looks OK to me..... what should I look for? I can think of very few things that could...
  11. R

    Trick behind track chain splitting?

    I forgot about that. This chain did have the snap ring, and I've been trying to take it out the wrong way...... no wonder it's not moving. I know the other side, the master will come out with the 4lb hammer and a punch. This chain is just about shot, but for the little that I use it, I'd...
  12. R

    Trick behind track chain splitting?

    Heat sounds like a good idea..... heat the pin, or the link? Rodney
  13. R

    Trick behind track chain splitting?

    For some reason the one track on my excavator got real loose and the adjuster is still adjusted where it was. Anyway, I went to split that chain to find the problem. I grabbed the 15lb sledge, and a shaft (to hit the pin), and a pipe to hold that shaft. I have got the master pin about 1/4...
  14. R

    undercarriage interchange?

    I was told by my track shop that the track chain on my JD 790 is used on a bunch of other machines. I use my machine very little and have been hoping to find a set of good used track chains. Is there anywhere that I could find which ones also used the same thing? I am not opposed to finding a...
  15. R

    I heard a 'bang' and then my track went loose?

    Turned out that the piston had somehow slid off of the idler. Rodney
  16. R

    I heard a 'bang' and then my track went loose?

    I went to move, and I heard a bang (could have been the sprocket slipping in the chain), and the entire track was loose, all the way, all the adjustment was 'off'...... I tried to put grease in the tensioner to tighten the track, but no grease will go in, like it's reached it's end. Could this...
  17. R

    JD 790 undercarriage

    The bushings are not wore through. I initially thought that the U/C didn't look too bad, but then I got out the tape measure. I have been to Harvey, and had him do some work for me on a D6, and he was real resonable. I also think that JD used these tracks on a 200, not sure of which suffix...
  18. R

    JD 790 undercarriage

    I have a 790 excavator, and the U/C is nearly wore out. Is there any way (besides feeling) to know if the pins and bushings have been turned? The pitch is getting close to the end of it's life. I didn't realize it till I threw a track off, but the adjustment is already at the end. We had a...
  19. R

    towing a trackhoe?

    I am looking at buying a trackhoe that needs an engine. From what I have been told, the engine was wrecked with ether, so it does not run..... Can they be towed? Will it ruin the drive motors? This is a JD790D. Rodney
  20. R

    what does the robex in hyudai's mean?

    I saw a few hyundai's for sale, and some said "Robex" So, I got to wondering what the difference was between some that said that, and others that did not. Specifically, I saw two 130 machines, one Robex, one not. Sorta sounds (I did some searching on here) that older hyundai's are not that...
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