Traction Booster is a form of weight transfer from the implement and to some degree the weight of the soil and ground resistance to the rear tires of the tractor. There is also some of the front end weight of the tractor that is transfered too. If set properly, which isn't hard to do with an operators manual handy, then the weight transfer can take place without lifting or changing implement depth. The Snap Coupler was best of all hitch set ups for Traction Booster but Allis also had a better than most set up with 3-point hitches too. Here is a video of how it works on the WD45........there is a better video giving more detail that Allis made back in the day but I can't find it.

As others have mentioned, it's Allis's method of draft control - pivot and lift points are such that it senses the load/pull on the hitch arms and lifts the implement slightly when too much drag is encountered. Usually it just lifts an almost imperceptible amount - enough so the tractor is taking all the weight rather than some of it resting on the soil, and thus there's more weight (and thus traction) on the rear axle, so it can power through the tough spot. If it keeps sensing too much pull, it will keep lifting, raising the implement out of the ground and thus pulling less. Although all manufacturers developed their own draft control systems, Allis really pulled out all the stops on theirs and did a great job on it. They also designed it so you could have the traction booster aspect work at the remotes for trailed/pull type (not mounted) implements: You hitched it to a special drawbar they offered that hooked across the three point lift arms. Because the load is sensed by the pull at the lift arms, it would sense the pull of your trailed implement. By having the control levers in the right position it would then send fluid to the remotes when it sensed too much load rather than lift the hitch, and would lift your trailing implement using the implement cylinder. I don't think any other manufacturers offered that ability.

Here's what the operator manual says for the 180 (it didn't copy too well):

The lever located nearest the wheel guard controls the tractor lift arms and is us ed to lower and raise mounted or semi-moumted implements

from transport position to working position and

vice versa. This lever has four positions, "Lift" , "Hold" ,

"TRACTION BOOSTER" and " Lower". When

the lever is moved rearward it will detent in the "Lift" position and as the lift rams fully extend the pressure build-up will release the detent and the centering spring will return the lever automatically to "Hold 11 position. When the lever is moved to the extreme forward position the valves in "Lower'' position and must be manually held in this position, slowly releasing the lever w ill return it t o the ''TRACTION BOOSTER" position which is a detent.

The lever must be manually moved to any other

position. The system will lower or raise the draft arms

at a faster rate in the' Lower' position than in

the "TRACTION BOOSTER" position. In order

to raise or lower in the "TRACTION BOOSTER"

position either the TRACTION BOOSTER or

Position Control lever must be moved.

TRACTION BOOSTER OPERATION

The advantage of weight transfer for added down-

ward load on the tractor wheels, efficient sus-

pension of the implement and the controlled depth

of the implement operation, have all been combined into the term "Allis - Chalmers TRACTION BOOSTER System" .

The rear lever nearest the wheel guard controls the TRACTION BOOSTER system. When using the TRACTION BOOSTER system with feedback, operate tractor with the levers positioned as follows: The lift arm control lever must be in the TRACTION BOOSTER detent position. The Position Control lever must be

moved forward, in the deepest, highest number

position. Select desired depth of implement

with the TRACTION BOOSTER lever.

TRACTION BOOSTER with f e ed- back controls

the implement depth to maintain a near constant

load or pull on the draft arms. In varying soil

conditions when tighter soil is encountered the

TRACTION BOOSTER system will automatically

sense the increase in load (pull) and raise the

draft arms slightly to maintain a constant load.

When loose soil is encounter ed the load will

lessen and the TRACTION BOOSTER system

will automatically lower the draft arms to pick

up more load to maintain a constant load. The

TRACTION BOOSTER system with feedback,

works to maintain a near constant load not a

constant depth . However , if the soil is not too

varied it will maintain an essentially constant

depth.

When a more constant depth is desired in widely

varying soils, it may be necessary to move the

TRACTION BOOSTER lever to a lower number

setting when encountering loose soils or to a

higher number setting when encountering tighter

soils. After passing through the tight or loose

soil return the TRACT ION BOOSTER lever to the original setting. In most operating conditions this procedure is not necessary.

TRACTION BOOSTER is generally used with all

implements that operate in the soil, such as

moldboard plows, disc harrows, bedders, etc .

The TRACTION BOOSTER system will maintain

a more const ant depth when set for maximum

feed - back. Refer to "Feed-Back Linkage" m

the 11Adjustments 11 section of this manual.

POSITION CONTROL

The rear lever nearest the operator controls the Position Control system. When using Position Control only, position the control levers as follows: The tractor lift arm lever must be in the TRACTION BOOSTER detent position .

The TRACTION BOOSTER lever must be moved forward, in the deepest, highest number position. Select any lift arm height with the Position Control lever to control the working position of the implement.

Kaleb wrote: I was wondering what that was, but here is my question, How do I wire the traction booster? what am i connecting it to? looking to restore my D14. I can't find any info on this.

Please clarify your question.  The traction booster is part of the tractor.  There is nothing to wire or connect.  If you have an operator's manual, it explains how it works.  If you don't have a manual, you really should get one.

10 and 20 series have an electronic switch for up and down + a dial to adjust your deptch. There's probably somehting for draft control in the electronics but I never tried to set it up. Stuff's so big now, you don't spin.

I've never seen a 4 position draft lever to select how much help you need.

The one by my foot just slides and you grab a knob, not a lever. I don't remember there being positions to it, but maybe there were some detents. I only messed with them a few times to select lift height

 My 8760 has one lever.  

The Allis Chalmers traction booster system is the only system that actually worked, if you knew how to set it, and adjust it.

NO manufacturer draft system worked as good or as fast especially John Deere whose system was pretty much non existent until electronics came into being.

Your 8760 has one lever and electronic adjustment to make it work. 

The flaw with traction booster was the dealers not explaining to farmers how it worked and how to turn it ON.

One example (of many) was my friends Dad plowing with the 8050 FWA and an Allis 4-16 semi mount plow, I argued with him there was no way an 8050 wasn't going to pull more plow than his 190XT did. His argument was their farm was heavy red clay, and to convince me he wanted me to ride with him out plowing. So I did and the plow pulled like a rock, it wasn't set completely right, so I adjusted that, and it helped but was still a rock, it finally occurred to me the traction booster wasn't on, I reached over him and turned it on and he immediately pushed in the clutch because he thought the plow had unhooked. He looked at me and said what the hell did you just do? I said the traction booster isn't on, and it is now. He went back to plowing and couldn't believe the difference " no wonder we pulled the old plow in pieces" he said a few rounds later.

What he was referring to was the the 4-16 Allis plow they pulled the hitch off of twice with their 7040 before trading for the 8050, which ripped the front off the plow not long after getting the 8050.

Nobody explained to them when they bought the 7040, or the 8050, and nobody stopped to ask why the 7040 was tearing the plow apart, it had the power so they just accepted it.

Allis didn't design the plow to be in the ground 12"+ going through clay knolls, the plow was trying to pull the knolls down, and both the 7040 and 8050 had the steam and weight to do it, and the 8050 the traction.

The spreader bar between lift latches made a distinct radial when lifting a lowering. So I always knew when the traction booster was working. I always enjoyed that.