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1970's Allis with very possessed hydraulics

T

Tank3

New User
Ok so, this is a 1970's Allis tractor, once again, I cannot remember the model number. It has a cab, no bucket, fairly large tractor.

The problem is, when you start it, the hydraulics simply do not work. You can leave it run all day long, and if you go back to try it, they still will not work. The only way to get them to work, is to take a large bolt out of the hydraulic pump on the engine, rev it up for a bit, and then it will start to work. Sometimes after 20 minutes of forcing the steering wheel around, it might start to work.

The owner of the tractor is convinced he has all the air out of the system. He has had the tractor for 20 years, it did it ever since he bought it, he had the hydraulic pump rebuilt a few years ago, and it still continues to do it to this day.

What would make the hydraulics lose there prime, IF that is, what it is? This tractor has me stumped.

If I could get some help on where to start, I would really appreciate it, thank you!
 
What model of tractor? Where is the hydraulic pump? Which bolt do you remove?

Not enough information!!!!!!!

Some simple causes: Restricted intake pipe/hose or screen. Wrong oil in system.
 

The hydraulic pump is located on the left side of the tractor, just under and back of the alternator. The bolt is a large, probably 3/4'' bolt, on the top left side of the hydraulic pump. That is the one we must remove to make it work.

I will find out the exact model number today when I speak with him.
 
Ok.

It is a 1972 (pretty sure) Allis Chalmers 200.

He told me the only way to get the hydraulics working, is to loosen this large bolt on the top left rear of the hydraulic pump on the left side of the engine, not take it out, just loosen it, then rev it up to about 1200 RPM, and work the steering wheel back and forth for about 15-20 minutes, eventually it starts to work! He told me he took the bolt right out the first time, and oil sprayed everywhere, leading me to believe air was in it, but, the hydraulic system has always done this, everyday for the last 20 years.

I am really stumped here. What is making the hydraulics lose its prime, and the oil runs out of the pump when it sits for more then an hour or so, assuming this IS the problem? Is there a check valve somewhere or something?

Please help, I would love to fix this. Thank you.
 
Don't know about that series tractor but my brother had a similer problem with another make.
The sump was devective (posibly from factory) that let air into the line from the res. to the pump.
The only temp cure was as you say, work the stearing back and forth and wait. Then if you shut off engine, no hyd on start up.
Could tell was an air problem by replacing a section of the sump hose with clear plastic tubing, you can see the bubbles going by.
 
So what would the fix be to that situation? I do not know hydraulic systems very well, never worked on any, but I am very mechanical. So I do feel stupid for asking this, but what do you mean by the sump? Is there not just a reservoir, pump, and hoses? Where does a sump come into play and where is it? Or is sump another word for reservoir?

There must be a permanent fix to this somehow.
 
Could it also be the draft conrol?

On my 7580 if the draft control was not left in the pull down position, it would lose prime. IT never seemed to work that well anyhow, but dad always wanted to run it plowing. Of course, with 6-16s, that tractor could dig a pretty good rut and still keep going.
 
Either a bad gasket where the return line mounts to the sump, a bad elbow rubber hose right there at the pump from the steel suction line, or a bad doughnut gasket in the suction line near the mount to the sump (I think the 200 has this, I know the 7000 does, and it's a very similar set up as they are very similar tractors). Also, could possibly have a small hole or split in the suction line somewhere, but if I had to bet, I'd say the 90 degree elbow line having a split/hole in it.

Hurst
 
Uh, dumb question but, what is a flow divider, and what exactly does it look like, does it do what it's name might suggest?
 
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