JD 855 One wheel stops turning...

[Brian_Stephens]

So it's winter and it's time to deal with so many of the little projects and issues.. My little tractor had been doing something odd in the summer.. one wheel will just stop turning... if I stop and it starts again with no issues...
Car guy in me says diff is jammed but if that's the case the other wheel should spin faster..

Looking for ideas..

someone wanna correct me on the below.

The engine drives the pump (which is part of the transaxle) with a driveshaft which drives the rear wheels. a driveshaft goes front and drives the front axle..

So low hydraulic fluid could stop the transmission... Could I also have developed an air bubble is it was very low??

Or is the rear diff closed?

 

[oldnslo]

If hydrostatic drive both wheels are driven so an air pocket would stop both wheels from turning.

 

[Mike1955]

Do you mean one wheel stops pulling?

 

[dieselscout80]

If you are referring to just the rear axle does the differential cause both sides to rotate?

 

[Brian_Stephens]

Answer to both questions and it dawned on me to check; It’s like the brake has been applied. One wheel drives the other seizes up. On wet it slides on dry it hops. Not good when you have a load on the forks.

 

[Midniteoyl]

Bad bearing locking up/jamming, maybe? Or the diff is messed up.

 

[Harry in Ky]

And you're SURE it's NOT the brake? That's a multi disc brake, not the simple shoe and drum type like the earlier models, so if it comes on due to something out of place in there it could be on TIGHT.

https://partscatalog.deere.com/jdrc/sidebyside/equipment/22053/referrer/navigation/pgId/1095970

 

[D&D]

So it's winter and it's time to deal with so many of the little projects and issues.. My little tractor had been doing something odd in the summer.. one wheel will just stop turning... if I stop and it starts again with no issues...
Car guy in me says diff is jammed but if that's the case the other wheel should spin faster..

Looking for ideas..

someone wanna correct me on the below.

The engine drives the pump (which is part of the transaxle) with a driveshaft which drives the rear wheels. a driveshaft goes front and drives the front axle..

So low hydraulic fluid could stop the transmission... Could I also have developed an air bubble is it was very low??

Or is the rear diff closed?

4wd on or off? Differential lock on or off? Only one wheel spins under power in 2 wd with the transaxle unlocked.
From the JD855 service manual
“The transaxle consists of the following mechanical flows:
• hydraulic pump drive • mid/both/rear PTO • HI/LO range • differential lock • final drive • MFWD (if equipped)
Transaxle serial number is imbedded in a flat surface located just below the left rockshaft lift arm.
The hydraulic pump is driven off the rear of the main PTO input drive shaft. This drive shaft is connected by a splined coupler to the hydrostatic pump drive shaft. The hydrostatic pump drive shaft is connected directly to the engine flywheel drive shaft.
The main PTO input drive shaft also has the main input gear that drives the PTO clutch. The mid and/or rear PTO drive is selected by the operator by moving the shift collar via the shift linkage.
Power flow is transmitted from the engine through the hydrostatic transmission pump into the hydrostatic motor and drive shaft output gear. This hydro output gear transmits power through the HI/LO selector quadrant into the spiral-beveled pinion shaft and ring gear of the differential assembly. The left side differential assembly bevel pinion gear transfers the power to the axle gears of the left differential planetary final drive and out the drive axle to the left drive wheel.
The differential lock uses a sliding collar with pins to engage the right side differential beveled pinion gear to lock the left and right axles together. Thus power is transfer equally to the axle gears of the right differential planetary final drive and out the drive axle to the right drive wheel.
The optional MFWD (standard equipment on 955) is engaged by a sliding shift collar.”

 

[Brian_Stephens]

Thanks for the power flow. I will check the brakes and diff lock.

Lots more to look at just need to make space in the shop.

Thanks

 

[JLAlbert]

Before tearing the rear end apart, check for the rim turning in the tire. You may just need to add pressure to the tire