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#1 KennyP ONLINE  

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Posted January 14, 2018 - 05:03 PM

Has anyone ever thought of making a tandem rear drive using 2 Sundstrand hydros? Could it be done? Thinking a walking beam type axle, u-joint driveline to it. Just looking for feedback.


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#2 chieffan ONLINE  

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Posted January 14, 2018 - 05:24 PM

Are you thinking one behind the other?  Would be an interesting project for sure.


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#3 KennyP ONLINE  

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Posted January 14, 2018 - 05:45 PM

Are you thinking one behind the other?  Would be an interesting project for sure.

Yes. Nothing set in stone, just a concept to think about!


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#4 Trav1s ONLINE  

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Posted January 14, 2018 - 05:52 PM

Why two separate pumps?  I can see the benefit from a fabrication point but the rest leaves me  :watch_over_fence: 
 


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#5 KennyP ONLINE  

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Posted January 14, 2018 - 05:58 PM

Why two separate pumps?  I can see the benefit from a fabrication point but the rest leaves me  :watch_over_fence: 
 

How else would you get both driving?


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#6 chieffan ONLINE  

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Posted January 14, 2018 - 06:07 PM

Would have to have two pumps or the back one would just be a tag axle and no benefit.  Unless one could use a track between the front and rear wheels on each side ? ?


Edited by chieffan, January 14, 2018 - 06:08 PM.

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#7 Cat385B OFFLINE  

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Posted January 14, 2018 - 06:14 PM

How else would you get both driving?


Sprockets on the inside of the hub and chain driven?
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#8 olcowhand ONLINE  

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Posted January 14, 2018 - 06:17 PM

Easiest way would be using Case rear ends.  One pump to feed both rear motors in series.  I know you asked about Sundstrand, but they would complicate things.


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#9 KennyP ONLINE  

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Posted January 14, 2018 - 06:17 PM

Would have to have two pumps or the back one would just be a tag axle and no benefit.  Unless one could use a track between the front and rear wheels on each side ? ?

 

 

Sprockets on the inside of the hub and chain driven?

That's more work than a shaft connecting the two.


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#10 KennyP ONLINE  

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Posted January 14, 2018 - 06:18 PM

Easiest way would be using Case rear ends.  One pump to feed both rear motors in series.  I know you asked about Sundstrand, but they would complicate things.

Don't have Case goodies, but I have 2 Sundstrands!


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#11 dropped82 ONLINE  

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Posted January 14, 2018 - 06:55 PM

I have a few extra Case rears with drive motors. They are not permanent in my shop.


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#12 James Bosma ONLINE  

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Posted January 14, 2018 - 09:27 PM

Hmmm think I know where your going and think maybe possible

 

if the walking beam pivots at the front of setup, would make driveshaft easier, more compact

The U-joint needs to be inline with the pivot, if not the length of drive shaft changes and then other problems can occur

Jack shaft  will have to run above / beside the rear ends

either gear cluster of 3 or belt drive from jack shaft to hydro pumps


Edited by James Bosma, January 14, 2018 - 09:38 PM.

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#13 1oldbuzz OFFLINE  

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Posted January 15, 2018 - 02:03 AM

I may be out in left field

but I think connecting the 2 pumps is the easy part

 

I would be concerned with synchronizing the control

of the pumps forward/reverse

 

If not in sync its like a 4x4 with different

gears front and rear

one will work against the other


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#14 KennyP ONLINE  

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Posted January 15, 2018 - 05:36 AM

Thanks everyone. This is just a thought right now.

 

Hmmm think I know where your going and think maybe possible

 

if the walking beam pivots at the front of setup, would make driveshaft easier, more compact

The U-joint needs to be inline with the pivot, if not the length of drive shaft changes and then other problems can occur

Jack shaft  will have to run above / beside the rear ends

either gear cluster of 3 or belt drive from jack shaft to hydro pumps

I got to thinking about that pivot last night and have to agree with this. It would take some thought process to make it work. Maybe limit the travel to help with this.

I was also wondering about the control (fwd/rev), but an adjustable rod between the units would help getting that right. Then you have to think about the brakes that are outboard by the wheels.


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#15 KennyP ONLINE  

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Posted January 17, 2018 - 03:10 PM

Been thinking about this and I don't know if these two are the same series yet. If not, my idea may not work! I know one is a series 15, not sure about the other.






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