Hello, my name is Gary. I have a 750 John Deere 4wd w/Front loader which I have had VERY good luck with,a 318 John Deere w/ Onan ( which I rebuilt after a wristpin keeper came out when it was about ten years old ) and a Case 580B, which I had to rebuild about a month after buying it when the end of the camshaft broke off right behind the gear. My problem right now is that the 750 Deere, which has been pretty good up until now , lost all hydraulic pressure when I started it this morning. I could usually hear the pump as soon as it would start, but today there was no pump sound and no pressure upon starting. I'm hoping that it has a pump key that has sheared. Anyone else gone through this?
new member with 750 Deere Problem
- Thread starter garyl
- Start date
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Hello garyl, welcome to TBN! Glad to see you posting. Hope you enjoy being a member of our community. 
CompactTractorFan
Super Member
Welcome to TBN!!! Try the Hydraulics section.
moship
Veteran Member
garyl,
I looked through the Technical Manual and there is no keyway. The design utilizes a hex shaft to keep the gear from spinning on the shaft, and is gear driven. I'm guessing the parts are not available individually. Are you certain there is zero hydraulic pressure? I trust the fluid level is normal.
I looked through the Technical Manual and there is no keyway. The design utilizes a hex shaft to keep the gear from spinning on the shaft, and is gear driven. I'm guessing the parts are not available individually. Are you certain there is zero hydraulic pressure? I trust the fluid level is normal.
OP
garyl
New member
- Joined
- Jan 9, 2011
- Messages
- 5
- Tractor
- 750 john deere, 318 john deere,case 580B
The fluid level is normal. I guess it could be frozen, as it is cold out, but I am not sure what the easiest way to check it would be.That would make the most sense , as it was working fine the day before, but it has been colder and it still worked.
moship
Veteran Member
garyl,
How about some more background. Your original post only suggests you can not hear the pump and does not have pressure, but did not mention if the 3-pt hitch or FEL work.
Does the tractor have power steering? Some 750 like mine came with PS. If so, is it working?
You could always break open a hydraulic line to see if there is any flow, but you'll need to take the necessary safety precautions when dealing with high pressure fluid.
If there is no flow it could be ice formation on the suction side, but there would likely need to be a fair amount for this to occure. Tractors without PS use a screen, while those with PS will have a filter for the hydraulics. It's simple enough to draing some fluid or take the screen apart to confirm if it is a water issue.
How about some more background. Your original post only suggests you can not hear the pump and does not have pressure, but did not mention if the 3-pt hitch or FEL work.
Does the tractor have power steering? Some 750 like mine came with PS. If so, is it working?
You could always break open a hydraulic line to see if there is any flow, but you'll need to take the necessary safety precautions when dealing with high pressure fluid.
If there is no flow it could be ice formation on the suction side, but there would likely need to be a fair amount for this to occure. Tractors without PS use a screen, while those with PS will have a filter for the hydraulics. It's simple enough to draing some fluid or take the screen apart to confirm if it is a water issue.
moship
Veteran Member
Thanks for letting everyone know the outcome and glad to hear it is nothing major.
I am certain you already thought of this, but I'll mention it anyway. Change the fluid and filter (if you have Power Steering) in the near future.
I am certain you already thought of this, but I'll mention it anyway. Change the fluid and filter (if you have Power Steering) in the near future.
