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John Deere Tractors Discussion Forum
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Re: 4440 power beyond/vacuum return

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LarrySTN

02-16-2013 12:05:27
69.68.35.50



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B&D is spot on! If you return a high volume oil (ie hydraulic motor..vaccum motor on corn planter) to the sump, the transmission pump will NOT supply enough oil to the hydraulic pump and hydraulics will go to heck. ALL hydraulic return should be returned to the filter housing or teed line to the filter housing as B&D stated. The selective control valves (remote outlets) already do this, so when adding power beyond make sure it does also.

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Tx Jim

02-17-2013 05:33:56
67.142.163.24



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 Re: 4440 power beyond/vacuum return in reply to LarrySTN, 02-16-2013 12:05:27  
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Larry
It's been many years since I sat behind a JD dealer service managers desk. Will you PLEASE refresh my memory on how the return oil from a ""RH scv"" on a 4020/4430 gets routed to the hyd filter?? Thanks,Jim



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buickanddeere

02-17-2013 12:55:29
209.240.116.36



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 Re: 4440 power beyond/vacuum return in reply to Tx Jim, 02-17-2013 05:33:56  
Isn't there something in the operator's manual about that right scv and high flow loads? And some have a valve to turn in the scv for equipment with single acting rams? So oil returns to the trans sump with minimal back pressure? What ever the case, that oil return from the vacuum motor needs to be routed into that rockshaft return line. The proper port in a power beyond block. Or into a ported filter cover.

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Tx Jim

02-17-2013 13:42:45
67.142.163.25



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 Re: 4440 power beyond/vacuum return in reply to buickanddeere, 02-17-2013 12:55:29  
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That statement about high flow loads isn't in my 4255 operators manual. OK according to you JD engineers put that sump oil return outlet in the parts catalog for no good reason. Evidently you didn't read/comprehend Mike Aylward's post.



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buickanddeere

02-17-2013 18:23:55
209.240.116.36



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 Re: 4440 power beyond/vacuum return in reply to Tx Jim, 02-17-2013 13:42:45  
I completely missed Mike's post about the small low flow planters. Yes the direct return to sump will reduce fam motor seal pressure on old simple cheap motors.And the trans pump will keep up. Now getting back to the hydrualic flow that a 12 row planter requires.............



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Tx Jim

02-18-2013 06:27:45
67.142.163.22



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 Re: 4440 power beyond/vacuum return in reply to buickanddeere, 02-17-2013 18:23:55  
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I thought that a 12 row was what we were discussing. At least the photo schematic of the hyd sump connection came out of a 1760 parts catalog.



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