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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Undercarriage experts

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135 Fan

04-03-2008 17:42:07




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I'm looking at replacing the undercarriage on my 931B Cat loader (D3 size). Is there a procedure to line everything up straight? I've heard the idler has to be lined up with the sprocket and needs to move side to side a little but was also told the whole track frames have to be lined up with the machine. They are bolted solid and I don't think have any adjustment. The idler has shims that the parts diagram says are used as needed. I'm not sure if Cat has a procedure manual for this. One track is about an 1/8 of an inch off of center of the top carrier roller. I figured you guys would know. You've always helped me before. Thanks. Dave

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Bob/Ont

04-03-2008 17:52:41




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 Re: Undercarriage experts in reply to 135 Fan, 04-03-2008 17:42:07  
Dave yours is fastened solid, The sprocket should line up with the bottom roller. Pry the idler side to side and get it center with the bottom rollers. Use a string line along the inner flanges of the double flange rollers. Then use shims as necessaryunder the side plates to hold it there. The side plates should have about one shim thickness of clearance to the track frame when bolts are tight. When track is on move top carrier roller in or out to center in rails and tighten it there.
Later Bob

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135 Fan

04-03-2008 18:15:48




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 Re: Undercarriage experts in reply to Bob/Ont, 04-03-2008 17:52:41  
As always you make it seem so simple. How do you adjust the top carrier roller in or out? Also does it matter at all, if I need to change idlers, if the new ones are cast and my old ones are welded style? Someone thought I had counterweighted idlers for use with the backhoe. My machine calls for 4 double flange rollers and 6 single. Where do the double flange go? Mine are worn but I never looked real close. Thanks Dave

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Bob/Ont

04-03-2008 17:54:59




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 Re: Undercarriage experts in reply to Bob/Ont, 04-03-2008 17:52:41  
One more thing, tighten track as tight as you can get it, mark idler and track frame. Then back off idler 3/8".
Later Bob



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135 Fan

04-03-2008 18:22:39




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 Re: Undercarriage experts in reply to Bob/Ont, 04-03-2008 17:54:59  
That's a big reason I want to put new undercarriage on. How do I check if the seals in my track adjusters are still good? I've had a track come a little loose but that was after adjusting it tighter to keep it from coming off. I think with tracks adjusted looser to the proper tension it would be OK. If only I had lots of money, I'd fly you out to help me fix it. LoL Dave



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Bob/Ont

04-03-2008 19:04:01




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 Re: Undercarriage experts in reply to 135 Fan, 04-03-2008 18:22:39  
Wait untill Oct and you just need bus ticket from Calgary and Back.
The counter weights are a pair of cast donuts bolted to each side of the idlers. Idlers are special, have three bolt holes through them. The weights need to be put on when assembling the idlers in UC shop I think. New idlers need setting up when installed. It is possable your adjusters might be leaking back a bit. When you have the idlers off pull the yoke and extension rod out. The chromed surface on end of the rod is what runs on the seal. If it's not marked up or worn just replace the seals in the front of the pilot. If rod surface is bad get a machine shop to change the rod. I will get you proper roller sequence.
Later Bob

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135 Fan

04-03-2008 22:17:29




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 Re: Undercarriage experts in reply to Bob/Ont, 04-03-2008 19:04:01  
Thanks Bob. I must have standard idlers then. Nothing bolted to them. I've seen pictures with both styles. D3 usually has cast and 931 has the welded. If I need new idlers they come complete with everything but the side plates and the shims. Completely sealed with the mounting blocks ready to go. I hope I can just put some buld up weld on mine though. Idlers are around $550 each up here. I went to Trek today to look at the new idlers they have and get some answers on some stuff. Trek is original equipment on Volvo machines. They are also deveoping D11 undercarriage. Preliminary results are very good. I don't think anybody with a D11 would put junk undercarriage on it? The guy there said a lot of the good undercarriage is coming from Asia now. Not all of it yet but he thinks it's just a matter of time till China catches up. He said Italy has slipped in it's quality. He sells Trek but did say Berco makes an excellent product, just the dealer wants a lot for it. Trek used to sell ITM as one of their lines but had some problems with it. He was quite unhappy that the guy at the dealer I got prices from, said they don't install undercarriage. Apparenty the guy was only a parts guy there and the guy from Trek has a problem with parts guys. I got another dealers name to get prices from that he said is usually very helpful. If nothing else, I'm learning a lot. Pad swap is $540 plus $27 for shop supplies. I asked if it was cheaper if I took the old pads off? No, they usually won't put anything on the track machine for less than $550 because they are so busy. They don't even turn pins and bushings anymore because it takes too long. If I only had $150,000 for a track press. One last question, how do I hold the sprocket counterweights to undo the bolts from behind? They are held on by three bolts. Maybe you got these weights confused with the idlers? They look like fun to remove and even worse to put back on. Dave

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steve n carol

04-04-2008 16:49:30




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 Re: Undercarriage experts in reply to 135 Fan, 04-03-2008 22:17:29  
135 fan, where are you located?



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135 Fan

04-04-2008 17:26:22




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 Re: Undercarriage experts in reply to steve n carol, 04-04-2008 16:49:30  
Edmonton in Alberta, Canada. Dave



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CHinNY

04-04-2008 00:34:48




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 Re: Undercarriage experts in reply to 135 Fan, 04-03-2008 22:17:29  
The Koreans have caught up i'm still not 100% happy with the China made parts I have been selling Korean and it is as good if not better then Bero that i use to sell. Deere is testing Korean right now to use as OEM. There right about the track press work i have four press and except for used tracks i sell it is not worth doing press work for hire to time comsuming. No help i could hire a guy for 40-50 hours aweek doing press work but were are you going to find the help so i just don't do it. I won't sell my presses until i have my final auction cause when you need them you need them so my wife can sell them.

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