FordVegFarm
New User
I have a 1972 Ford 4000, tractor number C344551, with the 3 cyl gas engine, the select-o-speed transmission, and an independent PTO 540/1000 rpm. It has the gear driven external piston pump on the left side.
For many years, we have suffered with poor hydraulic operation, and I have come to know its symptoms quite well, but to date haven't been able to figure out a solution.
The symptom is that the 3 point hitch is slow to pick up after the tractor has not operated for a few days. The severity of the problem seems to be related to temperature. On cold mornings it takes FAR longer for the 3 point system to lift. I have had some success blowing compressed air into the rear axle housing through the fill plug at the top, under the seat. I believe that the oil is thicker on cold mornings, and it is harder for the oil to move (takes more suction). The compressed air "assists" the oil in moving toward the pump and generating a prime.
I do not think that priming the pump is the solution, as when the oil finally makes it to the hydraulic pump, the action is positive and without delay, and the hydraulic system works consistently until the work is done. Rather, the problem seems to be that the pump is losing its prime after the work is done.
I suspect a leak on the suction side of the hydraulic pump. But, I'm not sure how to find it. Any tips would be most appreciated. Is there a reasonable inexpensive way to do a vacuum test on the suction side?
I suspect that there may be a leak somewhere along, or at the end(s) of, the large diameter suction tube which runs from the bottom right side of the rear axle housing to the hydraulic pump. The parts diagram referenced below shows part number D0NNB835B for "TUBE, Inlet, L/10 Speed Transmission, 3550,4000" and part D0NNB835C for "TUBE, Inlet, W/10 Speed Transmission, 4000". I'm not exactly sure whether I have the "10 speed transmission" or not. I have the Select-o-speed transmission which has 10 forward speeds and 2 reverse speeds. I'm guessing this is NOT the 10 speed transmission referred to in the diagram, and that the correct tube for my tractor would be the D0NNB835B. Do any of you know whether that is right?
As I'm sure many of you know, New Holland has a great parts lookup system that allows for researching detailed part diagrams and part descriptions for even very old tractors like this. Related to the hydraulic symptom I've described above, the closest related assembly diagram I could find is titled:
(10A01) - HYDRAULIC PUMP ASSEMBLY, 2000, 3000, W/INDEPENDENT PTO, 4000 EXCEPT W/INDEPENDENT PTO
A link to this page on New Holland's website is provided.
The title of this assembly is puzzling to me, as it doesn't seem to apply to the 4000 model with the independent PTO. I have a model D1026E tractor, and I believe this means that I have the independent PTO. Yet, I can find no similar diagram for the hydraulic pump assembly which applies specifically to the 4000 model with the independent PTO. I would be most appreciative to any of you that might straighten me out on this point as well.
Thanks for any help and suggestions.
Al
Untitled URL Link
For many years, we have suffered with poor hydraulic operation, and I have come to know its symptoms quite well, but to date haven't been able to figure out a solution.
The symptom is that the 3 point hitch is slow to pick up after the tractor has not operated for a few days. The severity of the problem seems to be related to temperature. On cold mornings it takes FAR longer for the 3 point system to lift. I have had some success blowing compressed air into the rear axle housing through the fill plug at the top, under the seat. I believe that the oil is thicker on cold mornings, and it is harder for the oil to move (takes more suction). The compressed air "assists" the oil in moving toward the pump and generating a prime.
I do not think that priming the pump is the solution, as when the oil finally makes it to the hydraulic pump, the action is positive and without delay, and the hydraulic system works consistently until the work is done. Rather, the problem seems to be that the pump is losing its prime after the work is done.
I suspect a leak on the suction side of the hydraulic pump. But, I'm not sure how to find it. Any tips would be most appreciated. Is there a reasonable inexpensive way to do a vacuum test on the suction side?
I suspect that there may be a leak somewhere along, or at the end(s) of, the large diameter suction tube which runs from the bottom right side of the rear axle housing to the hydraulic pump. The parts diagram referenced below shows part number D0NNB835B for "TUBE, Inlet, L/10 Speed Transmission, 3550,4000" and part D0NNB835C for "TUBE, Inlet, W/10 Speed Transmission, 4000". I'm not exactly sure whether I have the "10 speed transmission" or not. I have the Select-o-speed transmission which has 10 forward speeds and 2 reverse speeds. I'm guessing this is NOT the 10 speed transmission referred to in the diagram, and that the correct tube for my tractor would be the D0NNB835B. Do any of you know whether that is right?
As I'm sure many of you know, New Holland has a great parts lookup system that allows for researching detailed part diagrams and part descriptions for even very old tractors like this. Related to the hydraulic symptom I've described above, the closest related assembly diagram I could find is titled:
(10A01) - HYDRAULIC PUMP ASSEMBLY, 2000, 3000, W/INDEPENDENT PTO, 4000 EXCEPT W/INDEPENDENT PTO
A link to this page on New Holland's website is provided.
The title of this assembly is puzzling to me, as it doesn't seem to apply to the 4000 model with the independent PTO. I have a model D1026E tractor, and I believe this means that I have the independent PTO. Yet, I can find no similar diagram for the hydraulic pump assembly which applies specifically to the 4000 model with the independent PTO. I would be most appreciative to any of you that might straighten me out on this point as well.
Thanks for any help and suggestions.
Al
Untitled URL Link