How free should the wheels turn on an auto

[Felix 145]

I’ve just had a automatic sundstrad transmission in half to replace a circlip on the end of a drive shaft. When I’ve put it back together I’ve noticed there is quite a bit of resistance when I turn the hubs. Is this normal or does it need splitting again? 
move only turned the hubs with no wheels on. The diff is working as the hubs turn in opposite directions. 

[pfrederi 17,866]

What model tractor do you have.  over the years sunstrand made different hydros for WH.  Wheelamatic, Hydro gear and Piston to piston...

 

Also the transxales varied over years.  if you have 10 pinion limited slip there will be a fair amount of resistance ....

 

Tow valve open???

Edited October 6, 2021 by pfrederi

[Felix 145]

It’s a c120 auto not sure weather it was a limited slip diff. It did have a good few pinion gears inside the diff when I undid the 4 bolts holding the diff together. 

[pfrederi 17,866]

That model should not have limited slip and the fact the wheel turn in opposite direct confirms that.  If the tow valve is open there should not be a lot of resistance.  Yours is newer than mine do you have an eternal brake band on eh hydro motor/??

Edited October 6, 2021 by pfrederi

[stevasaurus 22,861]

If the differential had only 4 bolts, it is 8 pinion.    I think it is OK.  The hubs are going to have some resistance.

[Felix 145]

No there’s no external brake band. No idea if the tow valve is open. I know I couldn’t push it into garage the wheels were locked up. The diff spun freely before it went back in.  

[stevasaurus 22,861]

The differential would spin "freely", no mater if a tow valve was open (if you have one) or not....but you still may not be able to push it.  Give us a model number.  Do you have the Owners Manual??  Lift up the seat and give us a picture of the top of the trans.  Do not push it if the wheels will not turn.  Put the rear end on trucks to move around.  Most tow valves are on the left side, and could be 1/2" open end wrench, allen wrench.  Really need model number and some pictures.

   Turning the wheels just turns the pinions inside the differential...not the differential itself.  When the rear end is on the ground and you try to push it, you are trying to turn the whole differential (with axles)...and some gears that work with the pump.  This is where the damage happens.  You need to know what you have and what the manual for yours says on how to move it without running.  If you have a tow valve and you can open it 1/2 turn, you should be able to push your horse.

[Ed Kennell 38,634]

28 minutes ago, stevasaurus said:

  If you have a tow valve

All my Sundstrands had tow valves.   All on the left side.  1

1. screw driver slot on the front

2. tee handle on top

3. 1/2" hex head at the rear

[Felix 145]

9 hours ago, stevasaurus said:

The differential would spin "freely", no mater if a tow valve was open (if you have one) or not....but you still may not be able to push it.  Give us a model number.  Do you have the Owners Manual??  Lift up the seat and give us a picture of the top of the trans.  Do not push it if the wheels will not turn.  Put the rear end on trucks to move around.  Most tow valves are on the left side, and could be 1/2" open end wrench, allen wrench.  Really need model number and some pictures.

   Turning the wheels just turns the pinions inside the differential...not the differential itself.  When the rear end is on the ground and you try to push it, you are trying to turn the whole differential (with axles)...and some gears that work with the pump.  This is where the damage happens.  You need to know what you have and what the manual for yours says on how to move it without running.  If you have a tow valve and you can open it 1/2 turn, you should be able to push your horse.

This is the only picture I have until I get home. The diff turned freely on the bench. Then when I put it back in the case I noticed when it was bolted back together it was fairly tight. You can turn the hubs by hand with no wheels on. 

[Felix 145]

22 hours ago, stevasaurus said:

The differential would spin "freely", no mater if a tow valve was open (if you have one) or not....but you still may not be able to push it.  Give us a model number.  Do you have the Owners Manual??  Lift up the seat and give us a picture of the top of the trans.  Do not push it if the wheels will not turn.  Put the rear end on trucks to move around.  Most tow valves are on the left side, and could be 1/2" open end wrench, allen wrench.  Really need model number and some pictures.

   Turning the wheels just turns the pinions inside the differential...not the differential itself.  When the rear end is on the ground and you try to push it, you are trying to turn the whole differential (with axles)...and some gears that work with the pump.  This is where the damage happens.  You need to know what you have and what the manual for yours says on how to move it without running.  If you have a tow valve and you can open it 1/2 turn, you should be able to push your horse.

This is the only picture I have until I get home. The diff turned freely on the bench. Then when I put it back in the case I noticed when it was bolted back together it was fairly tight. You can turn the hubs by hand with no wheels on. 
 

problem solved!!! I’d put the diff in the wrong way round. The nuts on the diff were fouling the gear that passes over the ring gear. 🤦🏻‍♂️

[stevasaurus 22,861]

Sooner or later, it is usually something that is easily over looked.  That is why those videos can be so important...along with the manual.