John Deere 4250 powershift transmission oil screen removal - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 64 Old 01-29-2018, 09:17 PM Thread Starter
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John Deere 4250 powershift transmission oil screen removal

I am changing the transmission oil on the 4250 powershift and where the screen is, there is an oil pipe. How do you remove the screen? I have done this on Quad-Range tractors that has the 1/2 inch drive to get the screen out, but I have never done it on a powershift that has the oil pipe that needs to be removed.

Thankyou
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post #2 of 64 Old 01-29-2018, 10:43 PM
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Re: John Deere 4250 powershift transmission oil screen removal

Remove the 2 filter housings and filters on the left side
There is a 1 inch pipe that runs over the 2 filter housings
Follow the pipe to the rear
There is a snap ring that holds the pipe in the transmission
The strainer screen for the charge pump is behind the pipe
Replace front and rear o rings on the pipe
Good idea to clean the dirt off the whole area before starting

Last edited by dave2280; 01-29-2018 at 10:49 PM.
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post #3 of 64 Old 01-30-2018, 09:40 PM
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Re: John Deere 4250 powershift transmission oil screen removal

At the front end of that 1 inch pipe, you need to unbolt the casting that the pipe slides into. There are 3 bolts that takes 13 mm wrench to remove. Then remove the snap ring as Dave2280 mentioned. Probably should plan to replace the small gasket for the casting where you remove the three bolts.
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post #4 of 64 Old 01-31-2018, 09:47 PM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

I have been gone for a couple of days. Thank you both for your response.. My concern was at the front end of that pipe. I wasn't sure how it worked there.
Again thanks for both of your help.
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post #5 of 64 Old 02-01-2018, 10:55 AM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

I'm looking at the rear PTO and it is leaking just a little. I'd like to replace the seal since the trans. will be empty. I haven't fixed one of these before so am I just going to need:
1-RE13181 Seal
1-R33337 Gasket
1-P50631 oring
Or does the oring even need to replaced? I am I missing something here?

Thanks again
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post #6 of 64 Old 02-02-2018, 06:27 AM
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Re: John Deere 4250 powershift transmission oil screen removal

It appears you've listed the necessary parts. If I was replacing seal I would replace O-ring. Good luck & be safe when you R&R snap ring(C1919R)
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post #7 of 64 Old 02-02-2018, 04:34 PM
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Re: John Deere 4250 powershift transmission oil screen removal

You can change pto seal without draining transmission. [Case first attempt doesn't work]
Head it down a steep incline just like you do going from 540 to 1000 shafts
Clean like you would an operating room
Check lower links on load control shaft
If they were greased in a timely manner, should be ok
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post #8 of 64 Old 02-04-2018, 09:02 PM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

I've been gone a couple of days again so sorry for the delay.

Dave, I am replacing the PTO seal while the tranny is empty since we are cleaning the screen at the same time as the PTO seal replacement. Also, the tractor is super clean right now. Thanks

Jim, are you saying when I remove and replace (R&R) snap ring? Like I have said, I haven't done one of these before. Just looking at the parts breakdown, I didn't know that I needed to go as far as the snap ring C1919R. If so would you mind a little more info. Thanks

Because of things going on around here, we won't be doing any of this job until February 27th. My son who works for a heavy equipment company (Trackhoe, huge loaders, large mining equipment, backhoes, forklifts etc.) want to help do this with me. Just trying to get all of our ducks in a row before we tear into the 4250.
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post #9 of 64 Old 02-05-2018, 06:36 AM
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Re: John Deere 4250 powershift transmission oil screen removal

Yes snap ring must be removed so brg can be removed from housing to access the seal for R&R.
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post #10 of 64 Old 02-05-2018, 03:52 PM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

I believe that while we are in there we will replace the R38219 Thrust Washer if it isn't to bad to get to. There is a what JD refers to as a "disk" that has teeth on it there in front of the Thrust Washer. The disk must be related to the electronic PTO speed indicator in the instrument panel. I'm not replacing this disk, I am just saying that it looks like it is in front of the thrust washer.

Thanks

Last edited by boneidaho; 02-05-2018 at 03:57 PM.
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post #11 of 64 Old 02-05-2018, 06:00 PM
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Re: John Deere 4250 powershift transmission oil screen removal

We just needed o rings
There is an after market screen with magnets
Never used one
I would still look at load control bushings and seals
If they leak, transmission has to be drained again
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post #12 of 64 Old 02-06-2018, 06:41 AM
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Re: John Deere 4250 powershift transmission oil screen removal

Quote:
Originally Posted by dave2280 View Post

I would still look at load control bushings and seals
If they leak, transmission has to be drained again
Are you implying to R&R load control shaft to visually inspect seals? In over 11,000 hrs of use my 4255 has only required replacement of L/D seals once at about 7000 hrs. It still has the original bushings and I've plowed many acres with a JD 1010 22' field cult & JD 310 disk harrow plus made many 1000's of rd bales.
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post #13 of 64 Old 02-06-2018, 07:11 PM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

I wasn't planning on doing the load shaft seals. The guy I got it from said that he really never used the 3 point hitch very much. They are not leaking. I'm leaving it alone.

I live just about 4 miles from a John Deere dealer. I drove it over there today and had them dyno it. It held under heavy, heavy load at 130 HP+ for long periods of time, but also under lighter load went up to 140 HP many times. Never did hit 141. Its peak was 140 HP. Not bad for a 120 HP--35 year old tractor!! We dyno'd it for 3/4 of an hour and they worked the living crap out of it. . It does have a leak behind the head by the fire wall. Very little smoke from the exhaust and no blowby. I was happy about that Not happy about the leak
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post #14 of 64 Old 02-07-2018, 09:15 AM
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Re: John Deere 4250 powershift transmission oil screen removal

Had to do the 466 on ours
Leak doesn't get better
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post #15 of 64 Old 02-07-2018, 06:00 PM Thread Starter
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Re: John Deere 4250 powershift transmission oil screen removal

Quote:
Originally Posted by dave2280 View Post
Had to do the 466 on ours
Leak doesn't get better
Yeah you are right. Its the head gasket. Not saying that I am 100% right here either. But, its an external leak of the head at the rear of the engine on the right side as of now. It had only leaked under the heavy load yesterday. Driving it the nearly 4 miles home, it didn't leak and this morning there is no oil on the floor either. BUT, the head gasket needs replaced. There was no blowby during the dyno and there is no water in the crankcase either....yet! If it was leaking internally there would have been blowby so I am thinking that the head isn't warped. If the leak was internal, the compression would have been down and it wouldn't have produced the 140 HP that it did. They told me that they were pleased with the 3/4 hour dyno test. The 4250 did well.

So having said this, the head will be removed and taken to a machine shop to be checked out and milled if it is warped. But I don't think that it is. If it is, they will fix it.

I took some picture while there and now wish that I would have taken some while they had it under heavy load to show it under stress. I just got to pumped up at seeing it at 140.

Wanted to share the dyno pictures that I took. My friend that I bought the tractor from wanted to see them to.
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