JD 4300 hits a brick wall????

[9973720wb19]

Your 4720 wheels would be to large for his 4300.

Oh, Okay...thanks.

 

[RoyJackson]

Woody65. I have Standard R4 tires and rims off my 4720 Cab they have about 150 hrs on them - let me know if you're interested in them. I switched to R1s for snow and mud reasons. I don't know how I'd get them to NY from MD though.

The rims won't fit...the 4300 has 6 bolt rims, the 4720 has 8 bolt rims.

 

[Egon]

As mentioned, put it up on blocks, all four wheels, and run it at lower rpm's. Look and listen, check all the linkages and change ranges. Might want to activate the steering and pto's also.

Note: not experienced

 

[jenkinsph]

I agree with Kenny and others that your front axle and or drive shaft is the likely culprit. If the front axle locks up I don't think it will matter whether you are in 4x4 or 4x2 as the front drive line components are all turning full time and the disconnect is at the middle of the tractor. On a highway vehicle the front hubs are either locked or unlocked but not so on a mfwd tractor.

Don't know for a fact but suspect you will need to rebuild the front axle.

 

[Rick Gent]

I would agree with the others that if the tire size is correct, it's a problem with the axle getting bound up due to no wheel slippage. If your running on hard dry ground it's the same as pavement. The sharper you turn in 4wd, the more wheel slippage you need to keep the axle and everything behind it from binding up. I would suggest using 2wd most of the time and only use 4wd when you really need it. I leave my 4wd engaged all winter to plow my driveway, but in the winter there's always SLIPPAGE!!!

 

[Gary Fowler]

I would immediately consult your dealer on this before the problem causes some other item to be damaged.

I don't believe your use of full time 4 WD while on pasture or dirt would damage the running gear and as you say you are in constant hilly terrain which could be unsafe if not in 4 WD. It might cause some premature wear and for sure wears the front tires faster but it shouldn't cause your transmission to lock up. I think there is more likely a problem in the HST transmission. Damaged gears in the front axle wouldn't cause your HST pedal to jump back up and lock up the tractor.

 

[Woody65]

Thanks for all of the suggestions. I will take a look and a listen to the front axle and drivetrain to see if anything is damaged. Also, I am going to try and drive it in 2wd as much as I can to see if it occurs while the 4wd is disengaged. If anything comes out of it I will let you guys know.

 

[Woody65]

I would immediately consult your dealer on this before the problem causes some other item to be damaged. I don't believe your use of full time 4 WD while on pasture or dirt would damage the running gear and as you say you are in constant hilly terrain which could be unsafe if not in 4 WD. It might cause some premature wear and for sure wears the front tires faster but it shouldn't cause your transmission to lock up. I think there is more likely a problem in the HST transmission. Damaged gears in the front axle wouldn't cause your HST pedal to jump back up and lock up the tractor.

Gary,
I was under the same impression that driving in 4wd on dirt or pasture ( which is what I am always driving on) would not cause any damage to the drivetrain.

I hope you are wrong about the transmission but I will look into it as you suggested. Thanks

 

[jd110]

I would recommend draining the oil in front axle and transmission. Remove the sump screen and check for any debris in the oil and/or screen. Use a long flexible magnet to probe into the transmission and axle to see if there are any loose pieces. It sounds to me as if there is possibly a broken tooth floating around in the system ad occasionally getting caught between two gears or between a gear and the housing. If so, you are in a real danger of having a catastrophic failure. If no loose parts are found floating around I am not sure what is going on. Keep us posted on what you figure out.

 

[Agvg]

Loosing oil pressure in the transmission might be an issue, the behavior of the pedal excludes front axle faults by my logic, suppose you have a test outlet so it might be an idea to put a manometer there and have it so you can read it under normal use, to see variations and see what goes on when it have the problem.