Can a tractor lose it's hydraulic lifting ability?

[tman1020]

I had a Yanmar version of that tractor not exact but pretty close. Had lots of hours on it (not sure exact # hour gauge was broken at purchase with 950 on it) I added many more and added a Koyker 120 loader at time of purchase. all the hydraulics were very strong up to the day I sold it. I ran a 4 foot bushog. It handed it fine but would not recommend any larger. 12 auger was no problem either. With wheel weights and loaded tires it pulled a 1 bottom plow or a 4 foot box blade with 3 rippers just fine. It was a great tractor. Hopefully this helps answer some of your questions.

 

[pat32rf]

You can sometimes find that if it costs $1000 to restore to factory specs, you can restore to 98% of factory for $450.....or less. My young helpers chewed the cogs off my rear axle lock a couple of years after I bought my new JD. Probably cost thousands to fix but I added rear tire chains and get along fine....helpers have since grown up and left..

 

[dfkrug]

My young helpers chewed the cogs off my rear axle lock a couple of years after I
bought my new JD.

Not entirely their fault as your tractor used some soft steel in the diff lock mechanism.

As for the OP's 750, or any tractor's hydraulics, I would look first to low quantity or contaminated
hyd oil. A maintenance issue.

 

[jekyl]

Sorry for the delay in getting back to this thread. My family is getting wreaked right now with the flu. I am the last one standing. Let me apologize on not being very clear in my original post. Everything on the tractor seems to work fine. However, the loader seems a little weak. Remember though, this is my first tractor and maybe the loader is just fine. I was hoping it could be tested to see if it does in fact have the factory lifting capacity. I attempted to pick up a stump and it wouldn't budge it. Maybe the stump was simply too big. I did try the comet snow blower that it came with and I did not like the performance. It barely threw any snow. My wife has used the tractor a lot. She takes care of the elderly couple who owned it prior to us. All she ever did with it was tow three point finish mower and it always worked fine she said. I will get it into the shop for some maintenance and run these questions by the dealer. Expensive questions I will bet. The only other thing that I have noticed is, When I tip the bucket down to empty it, when the bucket is about 80-90% at the end of its range it slows way down before coming to its fully forward or down position. Thanks again gentlemen. Take care!

 

[teg]

Some tractors' hydraulic pressure are set on the low side. This can be check to see how far off it is and I'm sure it can be adjusted (I'm not familiar with JD). Do you have a photo of the stump? or at least a description like oak stump 12" in diameter; red clay dirt ball about 3'...

Same with the snow, was it a wet heavy snow and how far is "barely threw" - I assume you were at pto speed or greater...

 

[jekyl]

This does help. Thank you. I wanted to run a 5 foot tiller as well but I was cautioned on doing that. The only reason I wanted a 5 foot tiller is because that is how wide the tires are. With a 4 foot tiller I hear that makes the tractor not sit level and the tiller as well. Probably not a big deal. I have about 20 acres that I can brush hog. So 4 feet will take awhile. I have been doing it with a 4 wheeler and swisher up until now. This will be much better! Thanks.

 

[jekyl]

Yes I was at the PTO speed shown on the RPM gauge. The snow essentially just dropped a couple of feet in front of the snow blower itself. After that I took the snow blower off and just used the loader. I wasn't all that fond of backing up and looking behind me that much anyways. Due to my in-experience with the tractor and blower, I thought that I would hook it up again and give it another try but have not done that yet. As far as the stump goes, it was from an old cottonwood tree. The tree itself stood 104 feet tall. I hated to cut it down but my neighbor's tree fell against it and created a hazard. The stump was at max 3 feet in diameter and maybe 24 inches tall. I cut it into 5-6 chunks to move it easily. The stump was cut flush to the ground so no root ball.

 

[square1]

Were you at PTO speed when trying to lift the stump? That stump green weighed about 650 lbs., the JD 770 (model that replaced the 750) has a 1570 lb breakout force on the bucket. I would think the 750 would be very similar and should have lifted that stump. Maybe not to full height, but definitely off the ground to move it.

 

[jekyl]

Were you at PTO speed when trying to lift the stump? That stump green weighed about 650 lbs., the JD 770 (model that replaced the 750) has a 1570 lb breakout force on the bucket. I would think the 750 would be very similar and should have lifted that stump. Maybe not to full height, but definitely off the ground to move it.

Well, I just don't remember. I would have thought so but at that time the tractor was new to me and I was just learning to work the tractor. The loader on my tractor is a 67 Loader. According to the specs in the manual, it reads; ASAE rated lift is 700lbs, ASAE Rated breakout capacity is 1206 lbs, Relief valve pressure setting 1075 psi. I am not sure what all that means. I would imagine the 700 lbs rating is simply just that. I can lift something thats 700 lbs and under. The other two ratings are Greek to me.

I do need to have the throttle adjusted. It seems to creep back on me as the tractor is running. This winter as I am using it for snow removal, while working the tractor before you know it the engine rpm's have crept down around 1500 rpms. I am routinely having to use the foot pedal.

Thanks for your help.

 

[MHarryE]

Well, I just don't remember. I would have thought so but at that time the tractor was new to me and I was just learning to work the tractor. The loader on my tractor is a 67 Loader. According to the specs in the manual, it reads; ASAE rated lift is 700lbs, ASAE Rated breakout capacity is 1206 lbs, Relief valve pressure setting 1075 psi. I am not sure what all that means. I would imagine the 700 lbs rating is simply just that. I can lift something thats 700 lbs and under. The other two ratings are Greek to me. I do need to have the throttle adjusted. It seems to creep back on me as the tractor is running. This winter as I am using it for snow removal, while working the tractor before you know it the engine rpm's have crept down around 1500 rpms. I am routinely having to use the foot pedal. Thanks for your help.

Ratings are usually the best expectations. They state criteria like maximum lift at the pivot pins. The weight you lift can be far in front of the pivot pins. Think of lifting a barbell in your fist. Now attach that barbell to the end of a 4 foot stick and try lifting it. Not so easy.

The other numbers are all to do with how the tractor hydraulic system is set up. If you aren't familiar with the terms and you don't think your tractor is performing right, go to your dealer or find a neighbor who knows. Chances are the first neighbor you run into will tell you your tractor is a pile of junk and you should have got XXX, but talk to enough and you will learn.