Posted by CNKS on March 07, 2009 at 08:18:13 from (216.144.104.128):
This is a two-part question, the parts of which may or may not be related. 460U has a vented plug above the power steering unit on the steering column. It leaks. I disassembled the PS unit and replaced the o-rings, it still leaks. The power steering valve itself is NLA. The plungers for the valve (if that is the problem) are $30+ apiece, it uses six. Since they fit in the bores in the NLA valve, I am not sure new plungers in worn bores would do any good. Any suggestions? I can replace the vented plug with a normal pipe plug, which will stop the leak, PROVIDED it does not force fluid up the steering column, and leak past the seal under the steeing wheel, or perhaps blow something else. Also, related or not, the filler cap for the whole thing, trans/diff/TA/power steering had the vent hole plugged. That cap will be replaced with a vented one. (The entire hyd system has had all worn parts replaced, everything except the leak in the PS works) The PS vent still leaks with the main system filler cap removed. Everything from the engine back uses Hy-tran, except the worm gears in the steering. The Operators manual says "torque amplifier fluid" (discontinued) or "worm gear oil". I am probably wrong, but I assumed worm gear oil meant SAE 90, which is in the gear unit (NOT the PS unit) now. I had the PS off yesterday, replaced the seals and reassembled. It appears to me that the SAE 90 and Hytran are mixing, as there is no seal on the shaft that enters the gear box. Is this my problem? There is only 1.25 pt of 90 to mix with 10 gal of Hytran. Tractor probably has not been run enough to cause damage, but if it is wrong, it needs to come out. Suggestions are appreciated. I followed instructions in the IT and Blue Ribbon Service manuals.
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