jdemaris
11-27-2004 19:20:41
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Re: JD 450 Track Loader- Hydraulic problem, need h in reply to Dave Newman, 11-27-2004 11:41:54
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The 450 loader has TWO filters, not just one. There is a suction filter and a return filter. When the suction gets plugged the hydraulics will barely work. On the top of the hydraulic tank there is a cover bolted on with 3/8" bolts. There is also a return-filter-restriction indicator sticking out the top. If it's been run a long time with one of the return-filter plugged, or too thick oil, the indicator might be broken. It's a little metal peg with a pin through it. If you see it jumping up and down, there is a problem. IT IS NORMAL, however, for it to come up a bit when the oil is cold - even when the return filter is clean. Anyway, unbolt the cover, and lift it off -straight up. There is supposed to be a replaceble filter cartridge bolted to the cover. If it's not there, it fell off. This is the return filter. It is supposed to be held on by a very long bolt, and there is supposed to be a long metal bushing that goes inside the filter - thus enabling you to tighten the bolt firmly without crushing the filter. What often happens, however, is the bushing gets lost (usually at the bottom of the tank), the filter gets put on with JUST the bolt, the bolt can't be tightened very much, and soon the bolt and filter falls off. The other filter, the suction filter, is a reusable fine metal mesh, and is at the very bottom of the hydraulic tank. It is held in by a spring-loaded clip. You have to stick your hand down to the bottom of the tank to get it. Since it is a suction filter, it gets plugged with any debris that enters the oil, and it has no bypass valve. WHEN IT GETS PLUGGED, the hydraulic pump cavitates.
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