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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD450b crawler loader backhoe

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Mike Martino

12-01-2006 05:06:45




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I,ve been looking at a 1971 JD 450B crawler loader backhoe. I've been using alot of the info. you guys have been giving me in going through the machine.
I have noticed on the machine that when its moving there is movement on the right side front cross bar. Is this something that can be re-torqued or does it need replacement? What are the side effects of the machine operating like this? The meter reads just under 4000 hrs. for what is worth. The machine is at a dealer so they no nothing about the machine. Also the machine has a hard time turning left, it will do it in low gear but not in any high gear. How do you adjust it? Also how do tell when there is know more adjustment left.

Thanks again
Mike

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jdemaris

12-01-2006 08:18:24




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 Re: JD450b crawler loader backhoe in reply to Mike Martino, 12-01-2006 05:06:45  
On a 450B, the crossbar that the track-frames attach to is supposed to be mounted rigid - unlike the 350s. The 350s are designed to be loose and sloppy - to prevent cracking. The constant movement creates a lot of wear. So, when you say you see movement - where you should not - where is it? I suspect it's not at the attaching points where the track-frames connect - probably inboard where the crossbar attaches to the crawler-frame? I think the loaders are different than dozers in the way it hooks up. There might be pins and bushings as certain points - and if so - I wouldn't worry about it. But otherwise, it going to be broken or stipped out bolts. You will rarely (if ever) find looseness problem on a crawler that will be fixed by retorqing a bolt. That, because the fasteners have so much stress on them already, that once they come loose - they hammer and break, or strip. In regard to the steering - if the band is not grabbing well, it will steering easier in a low gear. But, you have to determine #1 if it IS grabbing and in adjustment first. If not, adjust it. If it IS adjusted correctly, than it's no good. I find it hard to believe that a place is trying to sell it, yet can't do a 20 minute steering-clutch adjustment? Sounds fishy to me.

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