Another JD 2155 Hydro Thread

[JoshB]

Thank you for the SCV explanation.

So today I finally hooked up the pressure gauge directly to the main pump. The pressure was zero (see vid below).

JD 2155 Standby pressure test - YouTube

Then, I disconnected the drive shaft to the pump, on the back side of the shaft (not where it couples to the pump). I get a clicking noise inside the pump when I turn it by hand. Sounds to me like a pump issue maybe? Is this noise normal (I doubt it)?

JD 2155 main hyd pump clicking - YouTube

 

[DLTTrekkers]

Are you turning the shaft a little for and back ? Looks like it !Uncopple thick steelpipe and see if oil come uit when you start the engine ? Looks like no supply to mainpump . Test at testports in r- side of shiftcover .

 

[JoshB]

Are you turning the shaft a little for and back ? Looks like it !Uncopple thick steelpipe and see if oil come uit when you start the engine ? Looks like no supply to mainpump . Test at testports in r- side of shiftcover .

I was just turning it back and forth (left and right) to make the clicking noise. Also, there feels like no resistance whatsoever when doing that.

In post #9 I mentioned that I get oil flow rather quickly when I loosen up one of the hose clamps to the supply lines that go to the reservoir above the main pump. With the tractor idling, I don't have to loosen that clamp much at all for oil to start spewing out of it.

Do you have a diagram of the transmission pump test ports? I'll look in my manual also...

As I said though, it sure is a steady flow of fluid when I loosen clamps off any of those lines.

Thank you very much for the reply!

 

[Tx Jim]

I replied to your PM. Test port for trans pump pressure is on trans shifter cover. What type hyd valve controls loader & how is valve plumbed to tractor hyd's?

 

[fieldman12]

I have a John Deere 2155 also. The Mannheim Germany tractors such as the 2155 are great tractors but they can be problem child's when hydraulic issues pop up. The front hydraulic pump is supplied by the transmission pump. Rarely does the front pump ever go bad. Typically if it chatters it is because the supply to it is not keeping up. It possible could be the transmission pump or a restriction to the front pump. Not sure what options your tractor has but I know there is metal lines internally on these and older Mannheim German tractors that is known for cracking that will cause hydraulic failure. I want to say this setup was used on the two speed and Independent PTO option tractors. TX Jim knows his stuff when it comes to Deere machines. If you found stuff on the pickup screen and it was brown I bet it is the brake pads coming apart. Typically this is due to cheap hydraulic oil. These systems are very picky about what hydraulic oil you use. Only use Deere hydraulic fluid or a high quality hydraulic fluid that meets deere specs.

 

[fieldman12]

Nice looking 2155 by the way. Yours looks to be a late model.

 

[DLTTrekkers]

 

[DLTTrekkers]

Testports for testing transmitionpump pressure..front one ...rear one is oilpressure going to the mainpump...see if there is any pressure ?

 

[DLTTrekkers]

 

[DLTTrekkers]

Oilflowchart

 

[DLTTrekkers]

 

[DLTTrekkers]

 

[DLTTrekkers]

 

[DLTTrekkers]

Oilflow as on tractor

 

[JoshB]

Thank you so much for these flow charts! I didn't get any notifications about these posts so I just got them now.

I got my problem sorted out today! After much troubleshooting it turned out being the stroke valve on the main pump. All I did was remove it completely then inspect and reinstall. After that, everything came back to life. I am getting 1700 psi at its current adjustment but I want to drain and flush it tomorrow then I'll put the gauge back on it and adjust it the rest of the way.

I didn't find anything obvious when I removed it. I just looked it over and put it back in.

I'm still glad I went through everything else though. I learned so much!!

Thanks to all who commented! Thanks especially to Jim who gave me several very specific things to check and ultimately the suggested inspection that led to a massive smile on my face!

Great community here. Thank you all very much!

 

[Tx Jim]

You're welcome & I'm glad you're making progress. Before too much time passes adjust the stand-by pressure to factory spec's of 2250 psi.

 

[JoshB]

I intend to get it done today.

 

[JoshB]

I am ordering a new adjustment screw and jam nut (actually the entire stroke control valve). The one installed is seized so I am unable to adjust above 1500/1600 psi. Also, it is making a constant squeaking noise unless the hydraulics are in use. As soon as I stop Hyd actuation of the loader, it makes a constant noise right out of the main pump. I can even feel the resonance from the noise on the lines coming off the pump. The pump got very very hot after running it for a while also.

I noticed while driving around that whenever I push in the clutch the noise goes away completely.

I also want to replace the small main pump filter pictured below. The info I have does give me a good part number. Any thoughts?

 

[Tx Jim]

I couldn't determine if you knew filter PN but here it is. AL71020 FILTER-SERVICE KIT ADD 35.89 USD If your tractor was mine I install a magnet inside trans sump screen. Report back on pump noise after you install new stroke control valve.

 

[JoshB]

Thank you!