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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Newbie question about crawlers

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jkloepping

09-21-2006 15:45:29




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I just bought my first crawler tractor, and I notice that it really doesn"t steer and push well unless at a high throttle speed. It seems that something is slipping, although the transmission pressures thaqt I have checked are all good. This is a JD 555a.

thanks




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jkloepping

09-22-2006 07:12:05




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 Re: Newbie question about crawlers in reply to jkloepping, 09-21-2006 15:45:29  
Great suggestions, thank you! I did realize that the machine was a torque converter, but I didn't realize that it meant slippage at low speeds. I'll check the steering clutches also.

josh



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CH

09-22-2006 10:04:28




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 Re: Newbie question about crawlers in reply to jkloepping, 09-22-2006 07:12:05  
If you need manuals email me



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seann

09-22-2006 07:24:25




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 Re: Newbie question about crawlers in reply to jkloepping, 09-22-2006 07:12:05  
Also another simple note is to make sure the transmission oil level is up to where it should be. Mine has run low before, and the trans oil pressure remained normal but it became sluggish and lost pushing power. Once topped off properly, it pushed like a scalded bull once again. Most powershift machines also have various filters in their transmission oil circuit. Get a manual, find out where they are and make sure all of them are clean and clear and aren't inhibiting the free flow of trans oil. Good luck...

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jdemaris

09-22-2006 05:36:05




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 Re: Newbie question about crawlers in reply to jkloepping, 09-21-2006 15:45:29  
You DO realize it has a torque-converter drive and is supposed to slip a lower speeds? My comment may sound silly, but since you mention it's our first crawler - just want to make sure you know what you've got. When the 555 first came out - as I recall - it was the first Deere crawler we sold with torque-converter drive. It took some getting used to - both to use - and also to diagnose problems. My memory is a little foggy, but as I recall it was also the first one to have a de-accelerator pedal - which was not the most intuitive device to use. It was basically set up to be run a full-throttle and you hit the pedal to slow down or stop. Also, in regard to the steering-clutches - which may, or may not be a separate issue. Most I worked on, once they've been run at low pressure, restoring the pressure back to specs. does not fix the problem since the fibers tend to get wear-patterns in them and keep on slipping.

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Roy Suomi

09-21-2006 16:54:32




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 Re: Newbie question about crawlers in reply to jkloepping, 09-21-2006 15:45:29  
Maybe not your trans. slipping..At least you better hope not..Could be your steering clutches slipping from various different reasons.. There are 2 steel lines going from the steering valve under the seat to the steering clutch housings. 1 line to each steering clutch housing..Take the lines off and plumb 2 identical gauges into the valve [ where the shiney spool valves are visible]. Lock the shift lever into neutral , start the machine , half throttle ,watch the gauges for pressure readings..If pressures are low [ below 150 lbs.] ,move the steering levers [ or pedals] and watch for pressure differences between the two spools. There are adjustments on the linkage end of the spool valves..Either lengthen or shorten the " eye " to get the maximum pressure reading..I hope for your sake it's not the transmission..." Very expensive to repair....I've done several , not looking forward to seeing another..Good Luck

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