WD and WD45 Electronic Power steering conversion

5/8" coupler ( one needed, I bought 2 for trials) 

3/4" keyed steering u-joint

Go Kart Axle - Steps down from 1" to 7/8" to 3/4" keyed.

tie rod boot for water seal on input to unit. 

/http://https://stores.djstractorparts.com/tie-rod-boot-fd-337d/

50A circuit breaker

10AWG wire (enough to go back to the battery box)

Bruno Steering EPS controller (to trick the ECU into providing feedback) 

You will also need 3/16" (roughly 6"x6") plate steel and 2x2 or 1x1 angle iron (1 ft) to complete the fabrication. 

Since i am changing U-joint sizes, I had to adapt the steering shaft to 3/4" which involved shortening the original shaft by about 5.625" to fit this adapter. I Used the Go-Kart axle for this, Cut the threads off the end and cut the correct length off the shaft. Next will be to weld it to the steering shaft for a perfect fit length wise, and a nice tapered step down to 3/4" for the new u-joint. 

Red Power; https://redpowermagazine.com/

Great site! Similar expertise as here for all things Red.

B26240 wrote: Joe The article was in the Red Power bi-monthly magazine,  There is articles by the "Tractor Doctor" there version of our Dr. Allis.  He installed it on if I remember correctly a Farmall A or 100 with a mower deck that his wife cuts grass with.  Article included pictures, he mounted unit about where the PS unit mounts on a WD45.     Mark

I remember that article, it was awhile back. Probably more than a year? "Tractor Doctor" is my favorite part of the magazine!

I assume the unit was from a scrapped Saturn that you had access to. Are there any other vehicles (that you know of) that have a similar setup for parts?

 Well,, a lot more and more of us Have to go this route due to these very rare parts no longer available and if you do find the parts,,they are super expensive!!  Most owners would like to keep their tractors original,,AND their cars, trks,,just bout everything any more and eventually we all wind up like ole JTaylor and look for other ways to get our work done. Great job, JTaylor,,,keep up the great work and keep them pics coming,,,,

 Hey JTaylor,,did you consider getting the worm gear shaft and the coupler machined for a keyway,,thereby making it removable for later repairs,.,?? Just thinking,,,,,,,

I did have this thought, And There could be some improvements in other versions. with the proper access to a good machine shop would yield a better, removable coupler on the steering box side. I verified all my bearings were good and did not think we would run into any issues over the next 50 years so i was not overly concerned for my tractor. I would think someone who had the perfect resources and could spend a few bucks could make it happen.. although i wanted to keep within a certain budget and the local machine shop wanted $310 for the custom coupler and keyed shaft. that was my reasoning for the way i did it.. 

here is the 3/4" section of go kart shaft i cut out to fit. 

Welded onto the original shaft without cutting

Total length of the shaft now is as followed: 

I put the assembly into the frame once again to double check. it looks like it lines up perfect! I will very likely be re-using the original shaft support as well with a 1" to 3.4" bushing. 

 Looking Good, Justin,,Looking good,,!! Beautiful weld too,,,,,mig or tig,,?

From all the sources i have read, 80 ft lbs is the norm... the saturn vue weighs in at 4894 lbs gross weight. with 60% of the weight being at the front of the car, you have 2936lbs roughly over the front wheels that the EPS needs to overcome. 

the WD45 weight varies but consider 4000lbs as a rough number. exclude rear wheel weight and maybe 40% of overall tractor weight on the rear tires? you would have a front axle weight of roughly 2400lbs. about 500 lbs less than the saturn car. 

I would think we would be okay from a simple math standpoint.. only time will tell!