750D no steering

Btd9296

New User
Picked up an 84 JD 750D, Starts up on a dime and drives pretty well. The guy said it sat up for about a year before I got it. I have ordered my service Manuel already but would love to get a jump on this before I paint. My left steering pedal has no travel, its stuck in place I have used some lubricant and tried freeing it up and got a tad bit of play but no steering. My biggest question is where is the location of my steering clutches on this dozer. When I look through the rear I see my pumps, pto etc and cant see where the clutches would be.


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This post was edited by Btd9296 on 06/06/2022 at 09:50 am.
 
Young man you have a lot to learn, your 750 d has NO steering clutch. The drive is separate
hydrostatic drive units on each side. You are on the right tract to get all the linkage freed up
aft that if it does not brake and steer will require servicing the hydro. Most likely you can get
it freed up and adjusted right there where you are working.
 
Add to the below you need a service manual for sure before you go to adjusting those controls.
 
(quoted from post at 18:03:14 06/06/22) Young man you have a lot to learn, your 750 d has NO steering clutch. The drive is separate
hydrostatic drive units on each side. You are on the right tract to get all the linkage freed up
aft that if it does not brake and steer will require servicing the hydro. Most likely you can get
it freed up and adjusted right there where you are working.


I definitely do, I was trying to buy a D3 with dry clutches but it fell through. I am fortunate enough to have a friend that works for Deere that can get me part numbers. I am assuming the pumps on left and right I am seeing through the rear are the pumps for my steer then. Ill be reading up on those and how they work. Thanks for the help
 
Yes they are self contained hydrostat drives that are driven from shafts from a splitter box right
below your feet.First thing to do is be sure and check the oil in the splitter box they go out and
cost some bucks. I will look I may have a service manual. Back up I know I have a service manual question is can I find it LOL
 
(quoted from post at 19:58:06 06/06/22) I know I have a service manual question is can I find it LOL

I know that feeling all to well! I know I have something somewhere. I pulled the seat out since I need to replace it anyways and was able to get a better view, washed the entire thing good. That pedal is working a little now Id say Im getting 1/4 of travel on that first picture the silver rods that go from the pedal down under the floor. Once I have more daylight Ill try tracing those from up top to down below. I also added some fluid, the looking glass is way to faded to see through but it seemed to be about half full, I threw a few gallons in just to see what would happen. I really appreciate the help, this is going to be one hell of an adventure.
 
Those linkages have to be free or that big slug won't steer or go straight . All the pedals must be on their upper stops to function anywhere
normal. The pedals not only steer the machine , but also operate the counter-steer function. [reverses the direction of track when pedal is
pushed all the way to the bottom of travel ]. These machines were used extensively in the oil fields, but not found to be as reliable as a Cat
dozer. They had quirks with the travel patterns. Rarely would you find one that would travel straight in forward and reverse. Most had s patterns
or j patterns or take off one track sooner than the other. Some problems could be adjusted out but most were stuck with quirky patterns. Rarely
could you find 2 separate transmissions in one machine that had the same internal leakage so they would operate the same.
 
Forgot to mention.. The trans pressure gauge on the dashboard registers the lowest pressure of the 2 transmissions. Just incase there is a low pressure situation.
 



If you find that service manual let me know. The one I ordered came in and is not the correct one. Ill pay you for the numbers or for the book itself. I dont mind buying it I just need the correct one. I did manage to free up a linkage that was keeping me stuck as well as get a new sight glass in to help me top up fluid, shes a leaker but Im fine adding until I can locate it. I have my pans off now and will checking for them this weekend while my rollers getting pressed. I am also assuming based on my research that my 750 D is just a straight 750 and the D is just where it was built. Serial is T00750D710251

This post was edited by Btd9296 on 06/14/2022 at 04:10 pm.
 

Thanks for the info, I have my pressure testing gauges in now and once I get my manual Ill be checking all my pressures. If she will steer now that all my linkages have been cleaned and are free I think Ill be in good shape. My dash gauges are working but the glass is hard to see through so Ill be fixing that before I try to work it.
 
(quoted from post at 17:28:08 06/14/22)
The serial number you posted doesn't look right for the basic crawler serial number. Here is the serial number info, including locations of the different component serial number locations, from the JD 750 parts catalog.

https://partscatalog.deere.com/jdrc...roduction?a=1197&br=1061&locale=en-US

It looks like the D refers to an angle bulldozer blade. The actual base crawler unit serial should only be 6 digits.


It could have copied wrong from text Ill upload an image and also check your link out.



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This post was edited by Btd9296 on 06/14/2022 at 03:57 pm.
 
I guess my signal is to poor to post on this phone so if multiple replies go through I do apologize. I see how to get the base serial now from you link. Thanks for the help.

This post was edited by Btd9296 on 06/14/2022 at 04:06 pm.
 

I managed to get my manual and have made some great progress so far. Shes up and moving now. I do need to pull the right pedal off and clean it up well like I did the left since its getting stuck. Noticing at LOW RPM I get moments of bad jumping with the tractor in forward and reverse. It seems to even out but just curious on your opinion. Would you start by changing fluids/filters first or should I start checking a little deeper off the bat. I do have new filters on it and new fluid/filters on hand I just hate to waste it with what its costing in my area. Ill attach a video of it below at around 2:30 in the video you can really see the jumping. https://youtu.be/an6VLozhE48

I have read that Hydro units like High RPM so I guess it could be that as well.
 

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