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Question for the tractor builders

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#16 skyrydr2 OFFLINE  



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Posted January 18, 2018 - 04:43 AM

I have to chime in on hydraulic motors in series... it does not work like you may think.. hydraulics are not as simple as one may think.
Driveshaft driven hydros are much easier and WAY more efficient. Yup, a bit more technical as far as shafting and linkage go but do-able.
In the case of 2 hydraulic motors where the exaust from one drives the other...DREAMING! They are not pumps and motors at the same time ESPECIALLY ger-rotor types like the Case units use.
You need a hydraulic flow balancer unit and twice the hydraulic oil volume to do this correctly. Its $$ exspencive as hell too. With twice the volume you need more power as well and more oil storage to compensate the increased volume.

Edited by skyrydr2, January 18, 2018 - 05:14 AM.

  • KennyP said thank you




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Posted February 11, 2018 - 11:46 PM

A solid link between the front and rear hydros will not work with a walking beam suspension. With one axle tipped to the right, and the other tipped to the left, there is a serious change in the distance between the two swash plate control levers from what they are when on level ground. The throw for those levers is only maybe an inch or two. You need an adjustable cable to synchronize the hydros.


Sundstrand U hydros are ideal for this build. The rear shaft of the front hydro can drive the front shaft of the rear hydro. You just have to make sure that the shaft will extend and retract more than the max/min distance between them and not come apart or jam up when you need to remove it.

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#18 Cvans ONLINE  



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Posted February 12, 2018 - 12:03 AM

As a drive from the engine to the first axle you might want to consider using a CV axle that has been altered to telescope. Wouldn't take much to fabricate and would handle out of alignment situations better than U-joints. 

  • KennyP said thank you