Farmall 300 Hydraulic System Problem

AustinH

New User
I am restoring my late Grandfather's 300 Row Crop. We have been having some issues with the hydraulic system. We don’t think it is the pump, we think we are missing a part in the manifold. I will try to describe it, unfortunately there is no detailed drawing of it in the book that I have.

Where the steel hydraulic lines bolt onto the hydraulic manifold (behind the gages, below the steering wheel), there are two holes in the manifold for the two lines, one smaller and one larger, just like the lines themselves. Is there a machined sleeve or fitting of some sort that slides into the larger diameter hole before the lines are put on? It appears that there may be a need for something like this...

We are not getting hydraulic fluid pumping through the lines. We have a new (old) pump, new filter, and new fluid in the system.
 
Did you prime the pump? The screw plug on the top of the pump, I think it has a spring under it, keep filling it with a oil can, it'll get messy.....

--->Paul
 
If by priming the pump does not get it to start working, you are probably sucking air on the intake line. Put a section of clear plastic hose in the intake line before it goes into the pump and look for air in oil when running it. I put some piping into the filler hole and raised it up in the air and added a extra two gallons of oil to get it above the piping you are asking about to find my air leak. On my 450 before me some one put another pump on it thinking it was the problem when it was a air leak.
 

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