Allis Chalmers B Hydraulics

[Leejohn]

Sorry I couldn't get back to you before.....
To bleed the system run the cyl. all the way in. Shut off tractor and move the control valve back and fwd to take all the pressure off.
You might need some one to help you. Unhook the rod end hose from the cyl., put a pan under the hose and cyl. out let. Here is where you might need help, start tractor and run cyl. out real slow, making sure the reservoir does not run out of oil. After you get the cyl all the way out just bump the valve enough to get the air out the line. Hook back up to the rod end of the cyl.
If you have the reservoir over full at this point, when you run the cyl. in it well over flow the reservoir, so level the cap off. Now it should have no air and as you run the cyl. out the oil well drop just a little until the oil from the rod side starts feeding the pump. When you run the cyl. back in the reservoir should come back up at the point you started.
Now keep in mind the oil is cold and when you get it good and hot the reservoir might over flow again on you. If it does, with the oil good and hot, cyl. all the way in, suck out just a little oil. Maybe just drop it down about 2" from cap, that should give you enough oil when it is cold so that you well not suck anymore air by running out of oil.
As far as changing to a different oil thats a ?? as far as I know. Just stay with what you have. It should be just fine.
Hope this gets you up and running. Let use know....

 

[dcwatson84]

Id like to try this so that I can confirm that I have no air in the line, but I have a few questions...

1. By 'rod end hose' do you mean the hose on the end where the cylinder extends out?

2. When you say 'bump the valve' Im guessing you mean tap/bang it a little bit on something, but which valve are you talking about? The open valve that I disconnected?

Also, By disconnecting one of the hoses wont that prevent the pressure from building up, and thus prevent the cylinder from being pushed out when I start the tractor back up?

Sorry if these questions make no sense. This will be my first time bleeding the hydraulic system.

 

[Leejohn]

To start, #1 is yes. Its the hose at the end that the rod comes out.

? #2 & 3 The pressure well build when the rod gets all the way out, then stop. Now move the same lever the other way just alittle until you get oil coming out of the unhooked line. Stop and hook that hose back up. That is what I should of said and not say "bump"

 

[Leejohn]

dcwatson84
Did the bleeding get the job done?

 

[dcwatson84]

Sorry for not responding for (almost) a year. I was able to make-do last summer without having to bleed or do any significant work on the hydraulic system. However this year I want to have it in good working shape and not have to worry about being able to lift and move my harrow. So im going to try the bleeding procedure sometime this weekend and I'll post the results. Thanks for everyone who gave me tips, sorry the thread went dead for a year!