what did i screw up now

[knewell]

Was wondering if someone could help me figure out what I likely broke while trying to unfreeze my clutch on my jd 1070 mfwd. I was slamming the brakes with the clutch pedal engaged hoping to free the clutch while the tractor was moving. This worked one other time after tractor had sat awhile. Didn't realize it was in 4 wheel at the time if that matters. It wouldnt free up so I opened the cover and sprayed brake cleaner in clutch which broke it loose just by rocking the tractor while in gear eventually. Thought everything was fine until I realized it was in mfwd as i was getting ready to mow. When I disengaged the 4wd I get no rear wheel drive. The only way to make it move is by holding the diff lock on. I assume this happened while hitting the brakes when the clutch was frozen, but not sure as I havent been the one operating the tractor. I didn't hear anything unusual when I was rocking the brakes. The front wheels drive when I engage 4 wd. Thanks in advance...

 

[SPYDERLK]

I dont see how anything you did could have caused a problem. All component are nominally much more robust than any force you could have applied. Nevertheless, there seems a problem with the rear differential. Do you have rear WD when in 4wd if the diff lock is not applied?
larry

 

[knewell]

Thanks for the reply, Larry. I don't have rwd when in 4 wheel unless I use the diff lock.

 

[SPYDERLK]

Somebody on here is gonna know exactly what that means is wrong with the rear diff. Hope they see the thread.

 

[robbyr]

Not sure if this is in his area of knowledge but you might pm J-J. He seems pretty knowledgeable. Hope this will help ya.

 

[robbyr]

I meant J_J

 

[k0ua]

In my opinion, and keep in mind it is just an opinion, and I am not a mechanic.. You have a broken axle or broken bevel gear on one side. this allows no force to be applied to the "good" axle side. because the broken side is so easy to turn and does not apply any power to the ground. Think of it like this, If you jacked up one side of the rear axle, only one tire (the jacked up side) would would turn, correct?. Now break that same axle or the bevel gear inside the differential that drives that side of the axle.. It would still turn inside and the tractor would still not move. Ok now step on the differential lock, the tractor lurches off of the jack as the "good" axle will rotate also and pull the tractor off of the jack.."Sorry to tell you this, but you have "big trouble" right here in "river city"

James K0UA

 

[murphy1244]

Yep, Busted axle, jack it up and try to spin it and you will know.

 

[jd110]

Two possibilities come to mind. Either the differential gears have failed or probably more likely You have a sheared stub shaft in one of the final drives. See #1 and #11 in the diagram.

 

[robbyr]

I meant k0ua and murphy1244

 

[knewell]

So if back is jacked up and diff lock applied only one wheel should turn, correct?

 

[k0ua]

So if back is jacked up and diff lock applied only one wheel should turn, correct?

Ok. You see, it is not that easy to state how it should work..Even if every thing is in perfect working order, and you jack up one side, then the tire that is in the air (has the least amount of resistance to turning) will be the one that turns. The other wheel on the ground will not turn. If you press the diff. lock both wheels "should" turn together as the bevel gears and axles are solidly locked together. Here is what you should do.. Jack up the left rear tire, start tractor and put it in gear, let out clutch. The left rear tire should rotate, and it should turn with the full torque the tractor is able to provide. If you step on the differential lock in this condition, the right rear tire should pull the tractor off of the jack,, but it likely won't because the right side is "broken" (by the way do this at idle). If the Left tire in the air does not turn at all , then the left side is "broken". I hope this helps.

James K0UA

 

[jenkinsph]

Two possibilities come to mind. Either the differential gears have failed or probably more likely You have a sheared stub shaft in one of the final drives. See #1 and #11 in the diagram.

knewel jd110 is a very knowledgeable Deere mechanic who seems to always have the best advice, I would heed his suggestions.

 

[k0ua]

knewel jd110 is a very knowledgeable Deere mechanic who seems to always have the best advice, I would heed his suggestions.

Agreed, one guy with actual experience on the model, is worth more than 10 of us "armchair mechanics":thumbsup:

James K0UA

 

[knewell]

Yea that makes sense, I just wanted to isolate it to left or right side. How big a job is this? Thanks for all the replies.

 

[SPYDERLK]

In my opinion, and keep in mind it is just an opinion, and I am not a mechanic.. You have a broken axle or broken bevel gear on one side. this allows no force to be applied to the "good" axle side. because the broken side is so easy to turn and does not apply any power to the ground. Think of it like this, If you jacked up one side of the rear axle, only one tire (the jacked up side) would would turn, correct?. Now break that same axle or the bevel gear inside the differential that drives that side of the axle.. It would still turn inside and the tractor would still not move. Ok now step on the differential lock, the tractor lurches off of the jack as the "good" axle will rotate also and pull the tractor off of the jack.."Sorry to tell you this, but you have "big trouble" right here in "river city"

James K0UA

Yeah! Broken axle fits the symptom simply and exactly - and takes the problem outside the diff, which is probably real good. Easiest way to determine which side is in 2wd. Lock diff and pull against something that wont move The wheel that spins is good.
larry