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jdemaris
01-01-2004 06:18:30
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Re: Re: Re: jd450 hissing hot hydraulic fluid...wh in reply to John, 12-31-2003 18:55:33
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The hydraulic control valve on the 450 is pretty straight-forward and simple. If you're getting unusual noise from it when in a neutral position, either you're hearing noises from oil surging, or something mechanical is broken in the valve. Normally, in neutral (hands off all controls) position, oil simply flows through the valve unobstructed. So, if the valve is causing the noise, then there is some sort of obstruction. Try jiggling the controls and see that all feels normal. Each valve spool has springs on it, so it will return to a neutral position when you let go of it. If a spring breaks, the valve spool will just flop around, and perhaps, not sit in a true neutral position. Kind of hard to tell from here - but if it feels as though the spring-function isn't working, you can pull the end caps off the end of the valves and check the springs. They should all be pretty much the same except for the valve spool that has a "lock in float" position. Another possibility is some debris traveled though the sytem and got stuck in the valve. That's common, escpecially if you found our that your return oil filter fell off. If a piece of packing blows out in one of the cylinders, it runs through the system. That filter, the one that comes off will the top cover on the hydraulic tank, is held on by a long bolt. On the inside of the filter, is a long spacer - which permits you to tighten the bolt without crushing the filter. Quite often, the spacer has been lost, and the filter installed with JUST the bolt - which now can't be tightened very much, and soon the bolt and filter just falls off into the reservoir.
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