4020 Powershift and 148 loader oil return

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I'm working on changing my 148 loader plumbing from being on the two SCV outlets to a dedicated joystick (finally). I've looked at hte pictures in these two threads on where to source the supply and return oil.

http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=jd&th=294161

http://forums.yesterdaystractors.com/viewtopic.php?t=995575

Those are both syncro tractors. My powershift is a bit different. I have two filter covers and three lines going into the case near the filters. Which one is my return line that I can tee into and dump the oil from the loader?

21185.jpg
21186.jpg
 
http://forums.yesterdaystractors.com/viewtopic.php?t=995575

http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=jd&th=294161

(quoted from post at 07:57:46 08/09/18) I'm working on changing my 148 loader plumbing from being on the two SCV outlets to a dedicated joystick (finally). I've looked at hte pictures in these two threads on where to source the supply and return oil.

Those are both syncro tractors. My powershift is a bit different. I have two filter covers and three lines going into the case near the filters. Which one is my return line that I can tee into and dump the oil from the loader?

21185.jpg
21186.jpg
 

Line encircled in blue is rockshaft oil return line. Even though nay
sayers will state it won't operate correctly Yrs back I installed a 158 loader on a 4020 with powershift trans & returned oil from ind control valve to sump & loader operates just fine with no shudder.

mvphoto21189.png
 

Thanks Jim. I know there is a pipe plug behind one of the remotes on the back. Is that what you are talking about with the sump return?

This powershift rockshaft return line is harder to tee into since it is a straight-in hard line connection there at the case.
 
Returning the oil to the charge circuit is not as important when using a Power Shift,,the charge pump on a power shift pumps more oil and does it constantly than on a Sychro Range, where the pump stops turning when the clutch pedal is down..
 
Thanks Tim. So going straight into the sump is pretty much a non-issue? If so, that makes the plumbing a bit easier.

Thanks
 

Returning hyd to bung hole by SN plate is where I routed the return hose on the 4020 PS I mounted the FEL on. Spec's for original bung hole plug are shown in photo below that you could drill & tap hole in plug.

mvphoto21201.png
 
(quoted from post at 15:33:34 08/09/18) Perfect thanks Tim. That's my plan now

The original plan was to return oil to sump but then with years of experience, wear and real world operation. Deere did not make ported filter covers and power beyond blocks for nothing.
Among other things , dumping oil to the sump reduces oil flow through the cooler.
Why not just purchase a fitting and do it right ?
 

b&d
I'm curious how many 20 series JD tractors with powershift trans with frt end loaders that you've owned or repaired. I've owned 1 & repaired/diagnosed hyd problems on several. As I previously stated the FEL will operate fine routing return oil from FEL valve to sump. BTDT several times.
 

Why not connect it correctly for all the effort it takes. A worn pump and leaking seals reduces flow the front pump. Even with a good pump and no serious leaks. The oil operates hotter due to less flow through the cooler.
 

b&d
Correct to whom JD engineers or YOU?

JD engineers did not see fit to include the ported filter cover(T31170) in the early or late model 4020 parts catalogs as I just checked both PC's.

IMHO installing ported filter cover is a """farmerized addition""" not what JD engineers recommended.

I'm speaking from my 21+ yrs employment at a JD dealership having installed many frt end loaders on tractors.
Jim
 
With very little experience on John Deere equipment per se but a reasonable understanding of hydraulic systems in general, returning oil from a function in a closed loop circuit into the sump is less than ideal.

By doing so the charge flow that is available to compensate for internal system leakage from normal wear & for cooling is reduced.

I've always had the opinion that the ported filter cover looked like an afterthought & preferred to connect the aux. function return to an existing port if available. If no port is available to get the oil back into the loop, a ported filter cover is better than dumping it into the sump.

No disrespect intended. Just sharing my objective experience.....
 

IIRC acquiring the correct length bolt that holds the ported filter cover on a 4020 isn't an easy task. Farm frt end loaders are not designed to be utilized similar to industrial loaders so heating of hyd oil from loader use on a farm tractor normally isn't a problem. As Tim S stated earlier trans pump on a powershift trans pumps oil all the time the engine is running so therefore depressing inching pedal on PS doesn't adversely affect hyd performance unlike depressing clutch pedal on Synco-range equipped tractors which stops trans pump from pumping oil.
 

When it is so simple to compensate for 46+ years of pump wear and seal leakage , why not ?
Farmer Bubba is as rough or rougher on machinery than Construction worker Billy Bob .
 
(quoted from post at 21:24:38 08/10/18)

Farmer Bubba is as rough or rougher on machinery than Construction worker Billy Bob .

How about providing some facts not """b&d fiction""" that farmers are as ""rough or rougher"" on equipment than construction worker?
 
I'm glad that I am not the only one that sees the humor here. Both B&D and Tx Jim are [b:081a198118]NEVER WRONG[/b:081a198118] regardless of topic and both [b:081a198118]MUST[/b:081a198118] [b:081a198118]ALWAYS[/b:081a198118] have the [b:081a198118]LAST WORD[/b:081a198118]....

I'm waiting for the phone number to back one guy up and I'm waiting for the "ditto" to be the last word from the other guy...

Then again, maybe they will kiss and make up and gang up on me now?

1-800-522-7448
Ditto
 

Never stated or implied I haven't made an incorrect statement. I'll be one of the 1st members of this forum to thank someone for correcting any incorrect statement that I make because I think information on a tractor/equipment discussion forum should be CORRECT!.

So now since you must think you have more knowledge than I you can have the last word on this subject. :lol:
 

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