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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Cat 977H Recoil Spring Bolt

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Author  [Modern View]

08-25-2013 19:38:16

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The recoil spring doesn't provide tension, that's right. What it does is sets in the track frame with the rear end against a support that keeps if from moving rearward, and has a hole in the middle that the end of the through bolt goes through to keep it from jumping up and out/away from the support. (((I fabricated and welded up the whole setup on both sides of the one I redid as they were both rusted away to the point of being bent and unsafe))) On the front, the assembly sets on two ears that are captured between the frame and two bolt down plates that allow the spring to compress and move rearward should something get into the track.

That being the case there is a given distance between the rear support and the place the two ears set that has to be right or you can't put the assembly in and still bolt the hold down plates back on.

That being said, what dependzic says is exactly what I remember the manual saying. I wish I had it close but the manual I used on the 977 belonged to the customer. Further, the way I remember it, what you say is true, there is a specified length to the assembly. The way it works though is that the length is given to insure the assembly will fit back into the spot where it sets without being too long or short, nothing more. If it's off either way then the hold down plate will not bolt on and you have a BIG problem. From there there is another spec to back the nut off and then use the center bolt to lock it in lock it in place. Believe me, if one is put toether too short or too long it is BIG and a royal PITA. The two assemblies I had to install were both, thankfully, or unfortunately, given the point of view, way too short, and not too long. If they were too long I don't know what we would have done because there would have been no good way to hold it to tighten the nut. That would have been a BIG problem because to back off the nut it being under so many tons of force, took me and another guy, using a 24 inch adjustable wrench with about a 8 foot pipe handle, nearly an hour per side to back off the nuts and get everything right.

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08-26-2013 07:03:13

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 Re: Cat 977H Recoil Spring Bolt in reply to NCWayne, 08-25-2013 19:38:16  
According to my service manual, step 5 in installation says that after the assembly is locked down into the stops: "back off the tension adjuster nut until the spring tension is against the stops, and continue turning until the nut extends 1/16" beyend the end of the bolt, then lock it in place at the end of the spring bolt with the locking bolt and washer".

That would indicate that the spring bolt and nut are there only to facilitate installation of the assembly.

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08-25-2013 19:57:19

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 Re: Cat 977H Recoil Spring Bolt in reply to NCWayne, 08-25-2013 19:38:16  
NCWAYNE_-when I installed my 941b recoil spring it was separate from the center bolt. My friend had a 50 ton press and he had to build a jig to hold the spring sideways from shooting out and compressed it to the specified length so it could be installed.
i doubled nut the bolt so the 14 ton load didn't let go!! but I had no trouble backing the nuts off

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08-25-2013 22:03:01

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 Re: Cat 977H Recoil Spring Bolt in reply to dpendzic, 08-25-2013 19:57:19  
I can't remember exactly, but if I'm thinking right, the compression force on the 977 springs is well over 20 tons. That being said, the set length on th springs typically puts the ears right at the front of the hold down brackets so the nut doesn't have to be backed off but a little bit to release the spring to where it's resting in place. The ones I was dealing with had been compressed over an inch too far. As such there was a full inch that we had to back out the nut something like 1/8 turn at a time. The one on the left side where we were pulling down wasn't easy, but the one on the right side where we were having to pick up was a real pain.

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