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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 450 Loader Hydraulics

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Alan -Ky

03-25-2006 14:33:32




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i had hydraulic problems this past fall, that the engine would be laboring when just sitting but when i moved the bucket control it would not labor any more, so i rebuilt the hydraulic cylinders, took the valves apart checked and cleaned them, put new hyd. oil in the system, changed both filters in the tank. i finished this up today, started the loader up worked it up and down to get air out of the system, but the engine is still laboring real bad until i move the control lever, also the bucket dumps fairly fast but it rolls backreal slow, if you pull the lever all the way over to roll it back it won't do anything but labor the engine, if you let off the lever a little then it rolls back very slow. The raise and lower works great, just the dump and roll back, any help would be appreciated, would a new valve for the dump roll back possibly solve the problem. Thanks in advance for any help. this is a straight 450 loader with no attachments

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Original Possum

03-28-2006 12:34:15




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 Re: JD 450 Loader Hydraulics in reply to Alan -Ky, 03-25-2006 14:33:32  
Your system is telling you the problem is in the bucket cyliner control valve. It is not centered. I don't know about this system, but most have two springs to center the valve with a washer in between. Sometimes the washer is dished and the dish has to be turned a specific way to center the valve. Start there, but find out why the valve is not centering. Disconnect the lingage to see if the problem is in the linkage. If disconnecting the linkage doesn't help then it is in the spool or its centering.

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jdemaris

03-25-2006 15:26:30




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 Re: JD 450 Loader Hydraulics in reply to Alan -Ky, 03-25-2006 14:33:32  
Seems we had this discussion before. If your engine is laboring when no hydraulic functions are being used, there is a restriction in the flow that should not be there. The entire valve stack is open-center by design, so oil flow goes in and out of it unobstructed when you're not touching the levers. Assuming the system has not been modified, and/or there aren't extra valves - like a backhoe diverter valve, then the problem is most likely inside the control valve stack. All it takes is one of them to be not centering properly, and the oil-flow will be restricted. A standard Deere 450 crawler-loader has a 23 GPM Cessna gear-pump hooked as follows - the pump-inlet hooked to the bottom of the hydraulic tank drawing oil trough a wire-mesh suction filter. The pump-outlet hooked to the hydraulic control valve stack - in one end, and out the other - and from there it connects to the hydraulic tank and flows through a paper hydraulic-return filter. If you have extra valves installed, e.g. a backhoe or remote diverter valve, please describe.

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Alan -Ky

03-25-2006 17:02:19




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 Re: JD 450 Loader Hydraulics in reply to jdemaris, 03-25-2006 15:26:30  
yes sir we did discuss this problem in december, that is when we talked about cylinder packings, filters etc. it has taken me this long to get back to this stage, i don't have a diverter valve or a backhoe, it has an auxiliary valve located next to the bucket valve, it has a pipe plug in the bottom where it goes out and there is nothing hooked to it. out of the tank there is a line that goes into a tee, at the tee it goes up into the valve for the boom, the other side of the tee goes to under the seat and it is plugged there. also there is a suction line that goes out of the tank to the pump, there is a supply line from the pump that goes to the boom valve and then there are two lines coming out that go to the boom cylinders. then there is the bucket valve with two lines going to the bucket cylinders. if i could talk to you i could most probably explain it a little better. thanks for being patient

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