Go BottomNeed project tractor for experiment
 | Peters
Join Date: Feb 2002 Posts: 3034 Northern AL 
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2002-05-02 38052
I am looking for a project tractor. Ideally I need a tractor like a John Deere 755-855-955 which has the hydraulic drive which is separate unit from the motor and the hydraulic unit is driven only by a drive shaft. I do not need the original diesel as I plan to replace the motor, but would like most of the running gear. Does anyone know of such a unit sitting some place?
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 | Taylor Lambert
Join Date: Posts: 1 
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2003-06-27 58456
Peter there is a 755 I believe at Bay Implement at Red Bay Alabama, Ask for the Salesman Dewey. I beleive it has a rod hanging out of the side of the motor. 1-800-439-2006 Hope this helps btw what are you building? Take care Taylor Lambert ....
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 | Chief
Join Date: Jul 2003 Posts: 4297 Southwest MiddleTennessee
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2003-08-03 60855
I'll second that request......... Whatcha buildin'??? ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-04 60877
I am considering building an all electric CUT. From the work I have done you could get some 3-4 hour run time between charges. If done properly 6-8 around the yard. Of you could rid of the hydraulic pump whine you could run around the yard in relative silence.
In Army terms sort of like the difference between the Commanche and a UH-1. ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-04 60878
I am considering building an all electric CUT. From the work I have done you could get some 3-4 hour run time between charges. If done properly 6-8 around the yard. Of you could rid of the hydraulic pump whine you could run around the yard in relative silence.
In Army terms sort of like the difference between the Commanche and a UH-1. ....
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| Chief
Join Date: Jul 2003 Posts: 4297 Southwest MiddleTennessee
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2003-08-04 60880
I was thinking maybe a Back to the Future type John Deere time machine. ;-) Should aught to be interesting to see how it turns out. Would definitely be quieter. ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-04 60885
If you think about it we hardly ever use the machine more than 3-4 hours per day. I might start with a lawn tractor and see how it works. WML ....
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 | AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144 
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2003-08-04 60898
There was an article in Mother Earth News last year about someone who built an electric CUT. I started looking through that magazine when I was looking for different tractor brands and experiences and before I found this board. Anyway, I remember running across the article.
You probably won't need additional ballast with all those batteries. I use 6 volt golf cart batteries to power my equipment in my amateur radio station and they work really well and last for many years. ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-04 60926
I was going to go NiMH as I have worked with them and can get the battery packs made up already. I like the idea of mounting the batteries below the CG making it a very stable rig.
Peters ....
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| AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144
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2003-08-05 61030
One caution about the NiMH is that they self discharge rather rapidly, so you will probably need to keep them on the charger most of the time. There is the specified self discharge rate, but I have had this technology lose most of its charge in one month without being charged.
I have built pulse chargers for these that work well and deliver high current pulses of low duty cycle so that they don't overheat when fully charged.
I suspect that it is also worth asking why all golf carts as far as I know use lead acid deep cycle batteries. The lead acid technology is well known and mature whereas NiMH would probably have never been comercialized if it had not been for increasing costs of building and disposing of NiCad batteries. The hot new standard that competes for most NiMH turf is LiIon technology.
I use two very large 6 VDC deep cycle lead acid batteries hooked in series to power my ham radio station. The ham radio operators in NM have a linked repeater system and all of those remote stations on mountain tops are powered by deep cycle lead acid. ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-05 61045
I have been working on NiMH technology for the last 6 years. The cells themselves are not self discharging in is primarily the separator technology that is at fault. Pb-LA batteries have improved immensely due to the new separators. The old paper separators batteries did not last that long. Some golf carts are the new NiMH, but it is basicly a cost issue. When the price of the NiMH decrease with production then the golf carts will also use them. NiCd develop memory besides the recycling issues. The power to weight is not as good either. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2003-08-06 61059
Peters, there are several 'tractor wreckers' up here that have a few 'very tired' compacts kicking around two that I can think of that have websites are Lindsay Used Tractor Parts and Fawcett Tractor Supply.
There are also many in Western Canada but considering a 'compact' to them is anything under 60 hp I doubt you would find anything suitable in their inventory.
And of course with the difference in the US/Canadian $$$ shopping up here might be worth your while.
Let me now if you need help with addresses for the Canadian sites.
Best of luck. ....
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| AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144
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2003-08-06 61065
Peters, my experience with battery technology is in application of available cells rather than cell design. I did not know what the problem was with the NiMH self discharge, but separator leakage as you describe makes sense to me. Most NiMH packs that I still get today do self discharge. These are mainly small packs for portable radios and the separators are probably thin and leaky. I have built a number of pulse chargers to extend the life of batteries by not generating so much heat in the cells.
I have not used NiCds for several years. At one time, my 12VDC backup supply for my ham radio station was a bank of NiCd wet cells. Those cells were over twenty years old when I retired them. I don't expect the same life out of the Lead Acid golf cart batteries, but my current set is five years old and show no signs of problems, yet.
My 12VDC system for the ham radio now consists of 205AH 6VDC cells connected in series for 12 VDC. They are charged by two 37watt solar panels operating in parallel with an analog shunt regulator. I regularly exercise this system for emergency backup, but main power comes from a surplus military power supply used for aircraft maintenance. It can supply 14 VDC at 120 amps or so. This system supplys power for all my equipment including a 500W output RF amplifier.
The repeater sites that I mentioned use large commercial cells that are not intended to be used in a vehicle. These weigh up to 200 pounds each and most are single 2V cells. Some are set up in 6V banks.
From what I remember of the Mother Earth article, Lead Acid batteries were used and they were carried in racks on the outside of the tractor frame in front of the rear wheels. The battery bank almost looked like an extension of the operator platform. I don't remember exactly how many batteries were used, but I would estimate that you could put five or so of the deep cycle batteries that I use on the average tractor frame on each side.
Are you going with a 12VDC system or are you increasing the voltage to cut down on the current that you have to handle? Some of our high power radio hardware is being run on 24V or even 48V to cut down on large wires. What kind of controller are you going to use for a speed control? What kind of battery technology is used in the hybrid and full electric vehicles that Honda and Toyota have built? ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-06 61106
What I had in mind was to use the 48 volt NiMH power packs which are available and use the x55 series as they are hydraulic drive. The motor could mount where the diesel is and then would run the pumps constant speed. No controllers required. I may need to have some form of gear speed reduction but other than that it would be straight forward. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2003-08-07 61160
Peters, if you set it up and drive it that way how do you get 540 rpm from the pto? The tranny is geared at about 4:1 off the flywheel on the diesel to produce 540 at the back end. I would think the pto is a critical component of a CUT or else all you have is very quite mule which is already widely available. ....
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| Peters
Join Date: Feb 2002 Posts: 3034 Northern AL
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2003-08-07 61169
On the x55 series the PTO is independent off the input shaft. I would gear the motor to supply 3000 rpm and then use the HST to provide speed changes. Not the most efficient but easy for experimenting. ....
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 | wbowhunt
Join Date: Dec 2003 Posts: 207 West Virginia
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2003-12-25 72227
Did you ever get this experiment started? It sounds pretty interesting as a concept? I am certain there would be some HP concerns for attachments. ....
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