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John Deere Tractors Discussion Forum
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Re: 4620 hydraulics

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WTW

06-02-2020 20:21:48




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I suspect the hydraulic system is running out of functional return oil back to hydraulic pump. Based off your description of problem, What work you have done, knowing this is a PS transmission and if you are not seeing oil leaking inside differential case the next most likely place for return oil to leak to sump would be the filter relief valve for the (rear) functional return hydraulic filter. This filter has its own filter relief valve located in the base of rear filer cavity. If this valve is caught open return oil from all rear hydraulic functions will be routed to sump causing a lack of return oil to supply main hydraulic pump. These systems must have all return oil for main hydraulic pump to meet it normal pumping capacity. Recommend to drain hydraulic oil from rear end, remove rear hydraulic filter, remove the three bolts retaining relief valve housing in back of filter cavity and inspect valves and springs in this housing / assembly. Good Luck, DW

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greenmachine59

06-04-2020 16:14:19




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 Re: 4620 hydraulics in reply to WTW, 06-02-2020 20:21:48  
We checked the retaining relief valve and found little debris in it but was no fix the valve all functioned fine.



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