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John Deere Tractors Discussion Forum
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4630 fwa leakage

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Jerry

03-22-2004 05:10:20




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I have a 4630 w/hfwa and I am having trouble with the motor manifold leaking at the relief valve. I have replaced the oring on the valve where the tapered part meets the threaded part but it still leaks when engaging the fwa. Does this mean there is too much internal leakage in the motor? My next task will be to remove the return lines going back to reservoir to see if this changes anything. If it doesn't, what is the procedure for curing internal leakage. (My service manual hasn't arrived yet.) I got this tractor 2 weeks ago and love it. Just can't cure the oil leak. I does it on both sides. thanks

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david val

03-22-2004 14:56:08




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 Re: 4630 fwa leakage in reply to Jerry, 03-22-2004 05:10:20  
remove a front wheel, disconnect the drain hose (at the top of the king pin) and remove the elbow fitting with the tube attached to it. check the o ring and backup washer at the end of this tube. bad or missing o ring will alow high pressure into the wheel center that the drain line is unable to drain so excess pressure is drained by the valve. also check the end face of this tube for rubbing marks. if you see rubbing marks then the tube touched the hydro motor cylinder block and was sealed by it preventing drain from wheel center resulting in drain through the valve.
this motor-drain tube rubbing is probably beacause of excessive king pin axial play. a temporary fix is to back the elbow fitting/tube out a couple of turns.
if the problem is not from this area, then there probably is excessive leak between hydro motor valve and bearing plates and they need replacing. (a problem caused by contaminated oil, usually by replacing burst hoses without taking enough cleanliness measures).
david

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