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Tractor Talk Discussion Forum

JD 755 track loader

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Van

10-18-2003 19:18:47




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Working on a 755 track loader for a neighbor and the machine is fully hydrostatic. If you are moving forward and push the right track pedal to apply the brake and disengage the track (as to turn to the right) the right track goes into reverse, this is with the main drive selector lever in FWD. Any ideas out there? would it be a leaking or bypassing valve? Thanks in advance for any help or suggestions

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Van

10-20-2003 20:50:10




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 Re: JD 755 track loader in reply to Van, 10-18-2003 19:18:47  
thanks for the information guys, were getting the book now.



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Larry

10-19-2003 20:13:36




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 Re: JD 755 track loader in reply to Van, 10-18-2003 19:18:47  
Johnathan is exactly right. If you want to open a real can of worms, just fiddle with the adjustments on your own, you'll be talkin to yourself in no time. I have all Cat loaders in my fleet now, but I did have a JD 755, and all of our small dozers are JD. My mechanic got into that 755, and we ended up taking it to our dealer, and yes he's a darn good mechanic. Still with me. Good luck, Larry

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Jonathan

10-19-2003 07:39:33




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 Re: JD 755 track loader in reply to Van, 10-18-2003 19:18:47  
Both pedals should act that way. There is a point almost at full pedal travel where the track should stop. Then pushing it further will cause it to rotate opposite...thats counter-rotation. Thats so the machine will turn in a very small area. Wears the tracks quite a bit more , but comes in handy sometimes. There is a complicated adjustment process with the transmission control valve on the 700 and 800 series hydrostatic crawlers. Involves several gauges etc and usually alot of time....and a little experience with them helps enormously. Too many times I've seen someone start turning adjustment screws and adjusting linkage rods randomly "experimenting" ....and in this case , your neighbor may not like you when his machine starts mistracking severly or falls on its face pushing into a pile...even adjusting the throttle linkage at the injection pump can throw these things way off....best thing is to get a manual.There are certain steps and a proper order that they have to be performed in .

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david val

10-19-2003 00:28:49




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 Re: JD 755 track loader in reply to Van, 10-18-2003 19:18:47  
there is no brakes or clutches. as mentioned its hydroststic. i don't remember much of these machines except that they have a complex hysrostatic system with a 'torque converter behavior': when pulling/ pushing forces increase, speed is automatically decreased and power is increased. anyway. the principle is somewhat like a skid steer, you can have tracks counter rotated. so i think first thing to do in your case is to get a manual and adjust linkages to specs.
david

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