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John Deere Tractors Discussion Forum
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Re: 4020 and hydraulic motor use

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Author  [Modern View]

05-06-2013 16:49:55

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Wrong, the valves are different not the motors.
If the return line was incorrectly routed back direct to sump on a closed center Deere. The front pump will take a beating and fail from cavitation. Don"t blame the tractor for misuse.

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05-06-2013 22:11:20

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 Re: 4020 and hydraulic motor use in reply to buickanddeere, 05-06-2013 16:49:55  
Then why does Hypro have one hyd motor for open center systems, and another for closed center? The motors are not the same. I had to switch motors on a pump that was on an IH, to use it on a JD.

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David G

05-06-2013 20:01:44

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 Re: 4020 and hydraulic motor use in reply to buickanddeere, 05-06-2013 16:49:55  
B&D, good to hear from you again.

Why is it that the motor gets super hot when run on 4020, but cool when run on tractor with OC hydraulics?

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Tx Jim

05-07-2013 04:07:45

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 Re: 4020 and hydraulic motor use in reply to David G, 05-06-2013 20:01:44  
Quoting Removed, click Modern View to see

I thought orbit motors created heat on both type hyd systems because of pumping oil through an orifice. The reason closed center hyd oil gets hot is because operating an orbit motor is very similar to an internal high pressure leak. An internal leak on CC hyd system always causes the oil to heat.

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