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D6 U/C and recoil spring

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1 year 9 months ago #237742 by mog5858
The weather is nice out again so I started working on my never-ending d6 project. I would call it a basket case but it came assembled lol. there are 7 rollers that need attention as you can move them up and down so I know the bushings are shot plus I'm sure there's some weld built up needed to get back to the right size. after taking off the spring cover I found out that my recoil spring is out passed the stops in the track frame and is ready to let fly. the adjusting rod has been welded in place under closer inspection, not a big deal I cut it out and make a new one. first, I got to safely fix the spring and get it back into control. I was thinking about making 2 heavy horse shows with 1' all thread and then just suck it downright till it's compressed again or so I can cut the tensioner bolt that welded and then remove and rework the spring and its mount as half of its missing and all 6 bolts are broke off in the track frame. Does anyone know how many tons one should be expending the spring to need to hold/compress it?  this is off my d6-8U dry clutch 
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1 year 9 months ago #237743 by trainzkid88
i dont know if any companies make spring compressors that large. although a friend of dads they had a i think it was a d6 that they got springs for and that was how they had been packaged 3/4 plate with high grade threaded rod to compress it.
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1 year 9 months ago #237744 by PhilC
Replied by PhilC on topic D6 U/C and recoil spring
When you say "tensioner bolt" do you mean the one up the inside of the spring? If so there are special brackets and clamps that need to be made to allow the spring to be safely clamped and the bolt replaced. If the bolt is still intact then you can use the bolt to remove the tension off the track idler.
All this is detailed in the Serviceman's reference book. If you don't have a copy take a look in the members Library.

944A - Machine SN 43A2589 Engine SN 90A284
955K- Machine SN 71J3772 Engine SN 83Z0704
D6 SN's 4R732sp, 5R2724, 5R4832
D8 SN's 15A1254, 15A2287, 15A2723
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1 year 9 months ago #237747 by neil
Replied by neil on topic D6 U/C and recoil spring
Martin, can you let me know how you get on with this because I need to replace the bolt inside my 5U's springs as well

Cheers,
Neil

Pittsford, NY
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1 year 9 months ago #237757 by dpendzic
Replied by dpendzic on topic D6 U/C and recoil spring
my 941b took 14 ton load to compress the coil spring when i replaced it

D2, D3, D4, D6, 941B, Cat 15
Hancock Ma and Moriches NY
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1 year 9 months ago #237761 by hfdzl
Replied by hfdzl on topic D6 U/C and recoil spring
IIRC there is a inch dimension to compress the spring.to working length..

R2 5E3562 SP U.S.A. W.9151
R2 5E3563 SP U.S.A. W.9152
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1 year 9 months ago #237765 by mog5858
Replied by mog5858 on topic D6 U/C and recoil spring
thanks for your input. I do have the serviceman reference and will be reading up on how they safely deal with them. the second thing is I going to have to do is fix the "bad" rollers or mix and match new and old. I need to get the track's tension back off first then we go ahead and get the bad rollers out from under her and see what else pops up on me.
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1 year 9 months ago #237773 by PhilC
Replied by PhilC on topic D6 U/C and recoil spring
Let me know if your service reference book doesn't have the bracket details in it. The one in the members library does not have the info. Mine is for the 4R/5R but the track frames are the same.
What have they done to the top roller support frame? Looks like a rough fix?

944A - Machine SN 43A2589 Engine SN 90A284
955K- Machine SN 71J3772 Engine SN 83Z0704
D6 SN's 4R732sp, 5R2724, 5R4832
D8 SN's 15A1254, 15A2287, 15A2723

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1 year 9 months ago #237981 by mog5858
Replied by mog5858 on topic D6 U/C and recoil spring
PhilC yes the top roller "fix" dose seem a little ruff as with a few other thing on the cat I think this cat spent a fair amount of time in the bush or it was put together from other cats as there's been more than one thing that makes me wonder. the Y part of the the track frame that attaches under the cat has been broken on both sides and welded back together along with the main frame on the one side 2 out of the 3 are crack again. draw bar bolts are loos to the back of the transmission case plus the blade angle mounts have seen better days to say the least. the spring mastered 24 1/2" only a 1/8" longer than spec (both side match) so I think I will proceed with caution to take the spring out and star work on the other parts that need some love.

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1 year 9 months ago #237988 by trainzkid88
it looks like part of that top roller has broken off and is now hanging on the support shaft. that has definitely had a hard life.
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