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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: JD 450C hyd pump problem

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Author  [Modern View]

01-14-2013 20:04:14

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Shaving of the pump body like you describe is a pretty good sign of bearing wear. Lets the gears track looser and looser. The more shavings the more wear. Good systems flush, and a trip to the pump shop. As to the shaft, perhaps a driveline shop or machine shop can weld and balance the shaft... or a used one. For the pump, I'd take it to a good hydraulics shop and have them go through it. They may be able to repair or source your shaft as well.

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Lloyd East

01-16-2013 14:57:41

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 Re: JD 450C hyd pump problem in reply to kyhayman, 01-14-2013 20:04:14  
My brother and i have a 450c loader that did the same thing three times. i think it must have the same problem. First time it broke the shaft and second time it broke the center part of the pump. My brother bought another pump off the internet and put it on there and it blew the threads out of the outlet of the pump. I would think you could rebuild the pressure relief valve. It is probably just stuck. That is probably what is wrong with ours but we haven't worked on it any more.

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Todd Asbill

01-19-2013 17:43:46

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 Re: JD 450C hyd pump problem in reply to Lloyd East, 01-16-2013 14:57:41  
Its fixed. Someone had had the relief valve out at some point in time and did not have the poppet at the bottom of relief valve in correct. The system was over pressurizing causing the pump to lock up then the shaft would break.

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