Cat D6D track tensioner replacement and recoil tension spring lost preload

[.RC.]

14 ton its the pushing force the spring puts on the tracks when in normal use. That comes from the service manual.

Of course it will have to be compressed when you put your new parts in it prior to install.

 

[jjdow68]

Thanks Nige ! The thread from tctractor that you shared is very helpful. I really appreciate everyone’s input. I learn from each of you guys.
the place that Quoted me 1400 for the whole new setup told me the spring is 500 dollars. So most of the 1400 is labor. So its really not that bad money wise.
Among the many things I’ve learned so far.
I wouldn’t dare try this procedure without someone who knows exactly what they are doing and of course the proper tooling. I’ve learned a lot and will continue to ask questions to learn more!
‘thanks again everyone
‘cheers

 

[tctractors]

I did put pictures of recoils being repaired in the CAT Sprocket Pulling tread I used to post up, the compressing of a D6C/D recoil is around 15 to 18 tons force I tend to recall, the comment about nut thread damage when using good grade thread bar can be sorted by using high grade nuts and putting 2 nuts on each end, the other day I stripped a recoil on a D6N late Series that used 4 short lengths on 16 mm grade 8.8 stud bar with a good push off a 65 ton Service Press cylinder and no Drama, the tonnage would have been 25 to 30 ton to release the load, as for the D9G/H recoil strip out you use the top roller bracket mounting bolt holes to bolt down a press frame with a long cylinder travel and lengths of all thread with nuts put in the front plate to control release the front plate that traps in the 2 springs, no need to cut holes every place.

 

[Homer Dokes]

Gentlemen, I don't mean to hijack this thread and if I would be better served by starting a new please let me know. I have a 1960 D6b with broken springs and leaking tension cylinders. What you have been discussing here is essentially what I am about to embark on.

I have been fortunate to find and purchase new springs. I can't say the same for the cylinders. I have to hope that I can rebuild them as I have found seal kits. I am not new to track work or the mechanics of a dozer but this will be my first rodeo on tension springs. My first observation is that I will have to compress the springs by 7.5 inches just to get them to fit in the space allotted. Is this typical? In my situation the springs are broke in multiple points leaving no tension or stored kinetic energy in them at all. The previous owner placed angle iron spacers to the cylinder rod to prevent compression.