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Tractor Talk Discussion Forum

1954 NAA hydrolics don't lift

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Dave H

11-15-2003 05:08:21




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Can anyone advise where I should look next on my 54 NAA, I took the pump off and replaced all of the o-rings and I found what looks to be a piece of rubber inside of the pump as well as more inside one of the lines. This is the old style vane pump and all seems to work as it should when it is on the workbench. Any help is appreciated.




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Gary-Miss

11-15-2003 07:03:08




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 Re: 1954 NAA hydrolics don't lift in reply to Dave H, 11-15-2003 05:08:21  
The vane pumps gave problems and most have been replaced, I think. Since you appear to have rubber in it, however, I would go further. Get a kit for it, less than twenty bucks. Try Speedco (Dennis Speed) at SPEEDCO2609@AOL.COM Lift the top off,preferably with a hoist of some sort or, at least, two people cause it will pinch you and get you in a strain. Remove the rectangu;lar plate on top (four large bolts and a small one) It hides one of the bolts that holds the cylinder in place. Put some air close to the hole to pop the piston out. Put it next to a board. Don't try to catch it with your hand. It will hurt. The new O ring goes on the oil side. The backup leather washer goes on the outside. Make sure you reinstall the piston with the flat side first. It has been done before. The lift arms won't go down.Soak the leather washer in warm, not hot water while you are cleaning up stuff. There is a valve moved by the control lever. The one that usually gives problems is the floating valve called the unloader valve next to it. It takes a little effort, does not require special tools, remove this valve and replace the O ring on it. Other than that, flush the whole system, replace the oil with GOOD hydraulic oil. Yours may still have heavy transmission oil in it. Remove the plug at the pump and fill it with oil before you start. LEAVE THE LIFT LEVER DOWN for several minutes after cranking. You want the least resistance to oil flow possible while the system gets primed and filled with oil. Good luck.

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IanC

11-15-2003 18:09:32




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 Re: Re: 1954 NAA hydrolics don't lift in reply to Gary-Miss, 11-15-2003 07:03:08  
Only two minor things to add to Garys very good advice. As long as you're in there, replace the rockshaft position sensor pin in the draft linkage. And buy the o-ring for the unloader valve from your New Holland dealer. It's an odd cross section, and with too little, or too much friction from the wrong size your lift may not work any better than before.



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