john deere 750b

looking at a 1989 deere 750b low hours 80% or so u/c dry machine but he says the left side is slower than the right side. what exactly would cause that problem? and how bad would it be to fix? any idea what a fair price would be in this condition?

There is virtually no way 2 separate transmissions will work in unison.. I've spent days trying.. I've been to 2 Deere Hydrostatic schools while working at the dealerships.. One thing I've found to do first is to cut the hydrostatic filters apart and look for brass filings.. That's a dead giveaway for rotating group failure.. There are 3 different distinctive patterns that that machine can do all by it's self by just running the F-N-R lever.. First there is a "C" pattern where the machine gives a distinct C in forward and reverse.. Then there is an "S" pattern where the machine turns lets say to the right in forward and left in reverse.. Then there's the "F" pattern... Lets say straight in forward and one direction or another in reverse.. Sometimes one transmission starts before the other from a dead stop in neutral.. Motor displacement control valve adjustments , Pump displacement control valves , Servo height in the servo cans.. Pressures off at the main under-floor control valve.. Loose linkages in the control valves..Track adjustments not the same.. Lets see , anything else ??

Steven don,t know where you are in Tennessee but I have bought and sold used dozers for 50 years or more and my experience is in a 25 year old dozer a john deer hydrostatic is about the last thing I would buy. Was probably not perfect when it was new and like Roy said could be a matrix of things but could also be a hydro going out and not too many jack legs can patch that up. Big bucks a john deer. How far are you from Nashville Tennessee.

i am around 90 miles south of nashville.
from what i have been reading, i think i want to stay away from hydrostatic trans.
thank for the info guys.

jm. .... What's a " jack leg" ??? Can't say I've ever heard that term.....

As for being the expert on them that leaves me out as i only knew one guy that could make them work correctly . I have run many 750 -850 Deeres and when they work well they are great . The problem maybe just a adjustment or it could be something that will get into the Piggy bank. I ran and oil filed service co. back in the mid seventy's and had one of the first 750's and we had a problem with a charge pump , when AL came out to fix the problem a bunch of Deere people came with him and they worked on it and got it back up and running in a couple days but they had problems getting it back up to power that it had before it went down. But Al figured it out and it was back to where it was before . We started getting bigger and i was buying equipment for the company and we ended up with four 750's and 4 850's and four 550 . the 550's were a pain in the drain for us but the 750's and 850's got the bag run off of them almost 24-7 we ran two shifts of operators slip seating them building drilling locations lease roads , dragging drilling rigs in , pulling water trucks , trucks hauling pipe clearing pipe line wright aways location reclaming working in mud , snow or dust . They got hammered . But if there was a problem there was only one guy to call and he did not care if the one he came out to work on came from his dealership or not . Al worked for Hindmen equip. out of Butler Pa and not all the dozers we bought came from them . When i needed a new dozer it was a 911 deal and i needed it now , i needed one with limb risers and a winch and lights LOTs of lights and a straight and tilt blade . I do know that it does take the gauge set up to do the set up on them .

speed sensor, found on the motor. Take panel off back of tractor to get to it.

Hey tractor vet would you happen to have any pictures of your 750s from the 70s and 80s? I would love to see them. I really like these old dozers and i would love to see some original photos. Most the horror stories you hear are because someone has purchased an old used machine that has been hammered throughout it's life.. When buying a dozer you HAVE to
Know what you are looking for. I have a 1978 deere 750E. First model that ever came out and it is a workhorse. Just spent 30 thousand on undercarriage. The condition Of the dozer justified it. I lucked out and bought it from the second owner who had it since 1991. He took extremely good care of the machine. As with anything things can just go wrong but doing some inspection before purchasing sure helps. I have nothing bad to say about the original 750s. There are tracking issues with them but has
Anyone priced a new 750k? Over 350 thousand dollars. I think I'll deal with some issues here or there for the price difference.