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A-C D15 3-point controls operation ????

Crazy Horse

Crazy Horse

Well-known Member
Still looking at this D15 series II that I posted some previous questions about earlier in the week. I know it's not a candidate for lifing large round bales, but it's still a nice tractor and am still checking it out.

Can anyone explain how the two levers on the left side of the steering column that operate the 3-point hitch are supposed to work? Those would be the larger, lower hand lever (with two large square holes in the tin for holding it in place at the lower and upper end of its swing). Also, the smaller lever on top of the first one mentioned, this one has a bunch of small notches that can be used to hold it in place.

The consignment lot did get the hitch working by adding hydraulic fluid, but once it lifts up, it drops down almost as quickly as it moves up, not sure why that is happening, maybe someone could give me an idea why.

The owner is on holidays and the consignment lot guy knows less about these tractors than I do.
 
The hitch is a Snap Coupler system, not a 3 point hitch. It is a proprietary system of Allis-Chalmers. The longer, lower lever operates the lift arms. The short upper lever can be locked into those notches to set the amount of automatic weight transfer when using mounted equipment. The lift arms are pressure up, gravity down. The system can be set for delayed lift as well as hold.
 
So, regular class I 3-point implements won't work on this then? In my limited experience, looks much like most 3-point stuff I've seen but I must be mistaken. I'm not sure how a "snap coupler" would look as compared to a regular 3-point.

I'm lost on the "automatic weight transfer" part of your answer, once again I have limited knowledge of this stuff.

Meanwhile, if the arms drop on their own after lifting up and releasing the lever, then obviously something is not working right, maybe deep inside the system or at the control valve, etc?
 
As JMS/MN told you, The system can be set, for delayed lift, or hold. If the arms are dropping, after being lifted, then it sounds like the hold needs to be adjusted. Look in a manual for this adjustment.
 
Without a picture of the lift system, I can"t tell if it is the standard AC hitch, or a 3 point. At some point AC offered a standard 3 point as an option, but I don"t know the smaller D series very well. It could also have an aftermarket version. AC Snap Coupler is a bell-shaped casting under the center of the tractor, and the round end of the drawbar snaps into the housing. The lift arms at the rear are mounted near the top of the differential. Check Tractor Photos here to see if yours matches any in the AC category.
 
Posting a photo is out of my skill range, BUT I did look at some very good photos on the web of the snap coupler and from my memory, the hitch on this tractor here is different and more like a 3-point setup. I am going to wait till the owner gets back from holidays, the consignment lot guy can't answer any questions, I'm sure the owner will know what kind it is, maybe a 3-point and maybe he has some implements too that he wants to part with. If it were a snap-coupler and he had implements to sell, would that be a worthwhile consideration for a purchase?
 
Aren't the controls the same for either system? The notched lever should only be for the traction booster. The other one is for lift/hold/lower.
 
The fact that hydraulic oil had to be added along with the fact that it drops quickly suggests to me that oil is escaping from the lift cylinder which is located inside the lift housing and transmission. It could be a faulty hose since there is one inside there. Check the transmission oil level. If is over full, that would be proof. There are 3 separate oil systems, hydraulic at the front of the torque tube, power director in the bell housing area and transmission at the rear. I once looked at a D15 which was bubbling oil right out of the transmission filler cap after I used the lift a few times. That was a deal breaker for me.
 
Yes, the Snap Coupler system is distinctive, and offers some advantages over a conventional three point. Easier to hook up and better weight transfer. To check the lift hose other poster mentioned, you need to drain the rear housing and remove the lift arm assembly from the differential. That hose is inside the differential.
 
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