RMR said: (quoted from post at 09:29:18 01/17/08) I have been reading the heck out of the forums but i am lost. I accquired a 1956? gasoline 300 U with a loader. I use it to remove snow. It has been running fine for a while but now is becoming a maint. problem.
First: what manual is appropriate for basic maint. that includes the hydraulics, PTO and loader?
Second: Slowly the bucket has begun to sag under its own weight, rasied fine and tilted up. It has slowly begun to not tilt up at all. It will raise and lower fine. Now I get no power to the tilt at all and the lever has very little movement and seems to not push in. There is fluid in the res.(It has been quite cold and water could have been in the line and frozen?) I was given the tractor but I am in a over my head without reference material. I have some time and money to put in to it and want to learn about it. There arent a lot of local resources for help. I am somewhat mechanical when I have manuals and can ask questions when I need to. Any thoughts (besides get rid of it) THANKS
You didn’t state if you have an IH loader and IH hydraulic control valves, or one of the loaders IH offered with another manufacturer, such as Wagner or Pippin. The best manuals for IH hydraulics are
GSS-1280 Hydraulics Troubleshooting
GSS-1278 Hydraulics: Valves and Systems
They’re both available on eBay.
If I understand the symptoms you described correctly, you can still raise the loader arms normally, but tilting the bucket has become slower and it will not stay in tilt position but rather sags. It's not the arms that sag but only the bucket. As you know, there are two control valves, one raises the loader arms, the other controls the bucket tilt. The fact that one control valve appears to work properly, and the other doesn’t, would likely rule out what’s common to them both, which is the hydraulics pump. If the tilt cylinder isn’t leaking, then you can rule that out and you’re left with the tilt control valve. The fact that you’re encountering resistance even moving that valve further suggests something’s wrong there. The control valves contain a number of seals, orifices, and springs, and closely machined tolerances, that need to work correctly to hold a load. Sounds like there is some sort of blockage that you must rebuild the valve to investigate. I did so on my 340U and found a lot of crud in there. On the other hand, if this has only begun happening with very low temperatures, I suppose there could be ice crystals doing the same, as you mentioned . . . Maye you could move it inside, or warm up the valve with a hair drier to test out that possibility before you start taking the valve apart.
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