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Northwest Missouri | Hello all, I have to replace the seals on our D6 track adjuster and I don't have a service manual. How hard a job is this and does anyone know where I might find the manual pages to download?(i hate to spend $60 for a manual)...Any help/tips/tricks would be greatly appreciated!!
TIA, Scott
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Somerville, Indiana | Front idler has to move forward to get enough room for cylinder to come out of the housing...Can take the yoke loose from front idler bearing housing and leave the idler sit, or break the track if you have alligator links...If the chrome is coming off the track adjuster probably need to replace it, instead of having to redo it later...Make sure the front idler support has very little vertical play or the seals will go out again...Fixed with new parts you probably won't have to worry about that side again...I know I am not very clear, email works if you need more.
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Southern Iowa | I put a new cylinder and seals in my D6c recently. Wasn't too bad. Not sure about the D6D but before you break the track you need to compress the track spring a little and put some spacer blocks in between the stops and the spring. (just pump grease into the adjuster until it compresses the spring) Otherwise there wasn't enough room to remove the track adjuster cylinder. Only took about 1/2" on mine to give enough room. You might want to call a shop and ask if it's necessary on your machine.
Other than that it's not too bad....break track, unbolt push rod on idle yolk, roll idler forward, and pull out cylinder.
I'll dig out my manual and see if I can scan a few pages and post them. |
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Southern Iowa | Here's scans from the D6c book....
Attachments
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 2014-0001.pdf (317KB - 2372 downloads)
2014-0002.pdf (242KB - 2158 downloads)
2014-0003.pdf (233KB - 2016 downloads)
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sw corner ia. | make absolutely sure you are not letting that spring get loose. it will tear up anything in it's way if it does. here is a portion of the parts book page for a 6D..
 (IMG_0581.JPG)
Attachments
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IMG_0581.JPG (87KB - 1357 downloads)
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Southern Iowa | Good point...I meant to mention that. There is 25,000 pounds pre-load on the spring so you can imagine what it would do if it got loose.
If you end up needing to compress the spring slightly be sure to place steel blocks in between spring and the stops. Don't depend on the nut at the rear of the spring to hold it alone. Spin up the nut at the rear of the spring too once you have the spring blocked back.
If your spring looks bent or isn't laying in position straight or isn't against the stops straight you may want to have someone with experience take a look at it....don't take risks!
The threads on the bolt in the center of the spring are very often in poor condition and aren't safe for containing the spring. A lot of guys won't remove a spring using the old bolt. They pull the track adjuster like you're doing and then install a new bolt and nut to contain the spring during removal.....or....just torch the spring.
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Central / West Texas | I will second tHe don't trust the bolt through the spring thought. On our 6d the front idler was going out. Pulled it into the shop one evening to investigate. Let all the grease pressure out of the hydraulic adjuster and took off a track pad above the master link. Took out the master link bolts and gave it a tap with a hammer. The track broke lose, flew up in the air high enough to get ahold of a chain fall that was near it. This chain fall was hanging from a bridge crane that runs across our shop and travels the length of it, about 60'. It hit the chain fall with such force that it propelled the bridge crane about 30' to,the stops at the back wall. Had anyone been standing in front of the track when I tapped the master link they surely would have been crushed! The master link was near the differential whEn this happened and the track had to fly up at least 12' to get into contact with the chainfall. |
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Northwest Missouri | Thanks everyone for the input and manual pages...the preload is one of my main concerns. I have a buddy that just replaced seals on his D5 so I think I'll have him give me a hand so I dont loose one of mine! :) |
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CAT D6D Track adjuster
