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Discussion Forum

Traction Booster

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Illinois Reader

03-01-2003 12:13:00

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I remember driving my Dad`s 1958 model D17 pulling a drag harrow, it was a wheeled type, Harrogator brand. It was raised and lowered hydraulically, had it`s own wheels. It was pulled from the drawbar only and certainly did put the traction booster to good use. You could set it and the engine load remained the same, uphill or downhill or whatever the case, it made the wheels on the Harrogator carry more (or less) of the weight of the thing. Nothing was attached to the lift arms. So, yes, the traction booster would work with drawn implements if they were raised and lowered hydraulically with their own wheels.

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Dave K

03-02-2003 14:08:57

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 Re: Traction Booster in reply to Illinois Reader, 03-01-2003 12:13:00  
Well, I stand corrected (or whatever) I did say I am not familiar with the AC tractors after the WD/WD-45 as that is all I have owned and used. I did not have a remote hydraulic set up on any of my tractors. I find all this info interesting and educational. Thanks.


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03-02-2003 18:44:48

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 Re: Re: Traction Booster in reply to Dave K, 03-02-2003 14:08:57  
Dave nothing you said is incorrect......D17 worked basically the same as the WD and WD45. The traction booster basically works by pumping oil to a cylinder....whether it goes to the remote cyl or the lift arms is determined by which was the easiest path. AC had to come up with a way to keep it from going to the remote cyl so they designed the transport valve. When the knob on it was screwed out it kept oil from going to the remote cylinder until peak hydraulic pressure was reached.....if it was left in, oil would go to the remote because it had a greater mechanical advantage than the lift arms. In the first case, the lift arms will start lifting the hitch and transfer the weight to the tractor (good)...in the second case the whole disc would start to lift out of the ground (not good) and none of the weight gets transferred to the tractor (it can't transfer weight to the tractor if the lift arms aren't lifting anything). And there ain't no way no how you are going to get BOOSTED TRACTION (traction booster) if you are pulling any implement with nothing hooked to the lift arms PERIOD!

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Duey (IA)

03-02-2003 21:11:54

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 Re: Re: Re: Traction Booster in reply to Eldon, 03-02-2003 18:44:48  
You are correct about the transport valve. In addition, the transport valve allowed the oil to return to the sump when the load lessened.

The maximum lift on the lift arms could be adjusted with shims in the transport valve. By adding shims more weight transfer was obtained before the transport valve bypassed oil to the remote cylinder which would lessen the load by raising the implement on it's transport wheels. The valve control knob, when turned the other way, also locked the flow of oil from returning to the sump for transporting the implement down the road.

Without using the lift arms you can only lessen the load by raising the implement with it's transport wheels. This can be done automatically by by the traction boost when the lift arms are all the way up and then oil is sent to the remote cylinder.

We did have a traction boost hitch for a 190XT that consisted of a hitch that connected to the lift arms (three point)and to the drawbar. It was two plates about 3" apart (one on top of the other) that had a pin hole inset several inches for pulling pull type implements. As I remember, the implement hitch had to be shimed, on the pin, to make it fit tight in the boost hitch so when raised it tried to lift the whole implement like it was fully mounted thereby transfering weight. I also remember it was very heavy to install and dirty because, like a fifth wheel on a semi-truck, it had to be greased to reduce wear when turning.

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03-03-2003 07:20:49

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 Re: Re: Re: Re: Traction Booster in reply to Duey (IA), 03-02-2003 21:11:54  

Well I learned something....didn't know that you could use the transport valve to keep the cylinder up during transport. I guess that is where it got the name! We always flipped the transport latch on the disc and relieved the pressure from the cylinder when travelling down the road.

I've seen the tb hitch for a 3pt you had on the 190 in a book somewhere...I looked for it but couldn't find it. It looked like a fairly simple design as I recall.

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03-01-2003 18:38:51

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 Re: Traction Booster in reply to Illinois Reader, 03-01-2003 12:13:00  
We had a similar experience when my Dad bought a (excuse my language) John Deere 14' tandem disc to pull behind our '58 D17. It was a bit much for the D17 especially in plowed/dry ground. We cheated a little, by setting the Traction Booster to apply pressure to the disc wheels lift when it pulled hard, thus decreasing the working depth. It was only used sparingly and typically going uphill. Following with a drag harrow later, you couldn't tell where the disc was run shallow. Our neighbor had a new D19 & a factory Allis tandem with a special hitch that made use of the Traction Booster. It had a large vertical pin as the pivot for turning, but was rigid in the vertical plane; very much like the "LoadLeveler" hitches used on trailers now. The TB did the same as if there were a plow attached. If I remember correctly, the hitch was too lightly made and kept breaking. Gatz

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Nathan (SD)

03-02-2003 08:52:37

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 Re: Re: Traction Booster in reply to Gatz, 03-01-2003 18:38:51  
I have expieremented with the screw on the back of the tranport valve when using hydraulic drawbar implements. The traction booster lever if rusted solid all the way down. I assume that would be where you want it for heavy loads but Im not sure. The only machine I noticed any differene with is the disc. With the plow and the digger it seems to not work as well

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03-01-2003 17:05:37

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 Re: Traction Booster in reply to Illinois Reader, 03-01-2003 12:13:00  

Here's what I think happened....the D17 didn't have a transport valve (or it was shut off) and when the pull on the drawbar was increased the oil was diverted to the lift cylinder on the drag which lifted the drag off the ground taking less power to pull it. This was the reason you needed the transport valve to operate a wheel disc.....to stop the oil from going to the point of least resistance.

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dave k

03-01-2003 14:24:10

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 Re: Traction Booster in reply to Illinois Reader, 03-01-2003 12:13:00  
I do not know about the D17 but I think the traction boosters were all the same. I have extensive experiance with the WD's both before the snap couplers were avail and after we had snap couplers.

The WD traction boost does depend on the pull on the drawbar which is linked to the hydraulics and, as the pulling load on the drawbar increases, the hyd's put upward motion on the lift arms. This shifts some of the implement weight to the rear of the tractor boosting traction as long as the wheels do not slip.

I am sure that myself and others who pull from the drawbars with these tractors would like to see any way to get traction boost from only the drawbar!


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Illinois Reader

03-01-2003 19:52:44

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 Re: Re: Traction Booster in reply to dave k, 03-01-2003 14:24:10  

Reader Dave said:

I am sure that myself and others who pull from the drawbars with these tractors would like to see any way to get traction boost from only the drawbar!


Well, Dave, I wish I still had the tractor, I would show you. It worked and worked very well. After all, the early (Series I) D17 had such a simple hydraulic system, it didn`t care whether the oil went to the cylinder that raised the lift arms or to the remote outlet seeing as they were connected together. Under a hard pull, the drawbar compressed the snap coupler spring and if the traction booster was adjusted right, the result was increased oil flow to the remote outlet that effectively raised the harrogator. Nothing was attached to the lift arms and the engine load was constant, uphill or down. The traction booster effectively put more of the harrogator`s weight on it`s own wheels.

It worked like a champ.

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03-01-2003 20:27:43

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 Re: Re: Re: Traction Booster in reply to Illinois Reader, 03-01-2003 19:52:44  
We used to do that with a pull type field cultivator. The Traction Booster system is actualy an improvment on the original Ferguson draft control devise. The A-C snap-coupler plows used the natural line of draft to maintain depth and you had to overcome the plow suction to lift the plow out of the ground. By using the draft sencing hitch they found that they could load the rear wheels and maintain plow depth and somebody coined the name Traction Booster. In the old WD manuals they simply called it "drawbar control". Works very well too. The weight transfer deal was adapted to other implements in various ways with special hitches but like you said you could use it just like draft control with pull type equipment. Transfers no weight but will lift to keep draft more or less equal. Can't do that with anybody elses system unless a person used the draw bar that attached to the 3-point lift arms.

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That made Allis the TIGER in the field.

03-01-2003 12:33:32

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 Re: Traction Booster in reply to Illinois Reader, 03-01-2003 12:13:00  
Better yet use a TRaction Booster drawbar and it will use the implement weight for traction as needed. Saves time and fuel which saves money. Also the Snap Coupler for mounted equipment out performed any other system because the single pulling point allowed natural drafting. Joel L

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