JD 2550 pump question

[Tx Jim]

If power steering operates correctly it's possible stand-by pressure which should be 2250psi has lowered to 1700 psi. This lower psi allows pressure control valve(item 15) to block pressure to 3pt hitch, scv & fel control valve. It's also possible stroke control valve isn't seating as designed due to foreign material in seating area. If your tractor hyd pump has a de-stroking screw(item 6) one can with engine operating at idle speed turn de-stroking screw CCW to open stroke control valve then turn DS screw CW & if you're lucky foreign material if present will be dislodged from SC valve seating area. You could if de-stroking SC valve doesn't solve pressure problem possibly attempt to back your tractor on trailer dragging bucket rearward.

 

[DLHWoodstock]

Hey Guys
I just wanted everyone to know that the problem with my 2550 tractor and 245 FEL has been corrected. Tx Jim was a great help to me and gave me the information i needed to fix it. It appears that the stroke control seat had some debris in it, not allowing it to seat properly.

I did check for internal leak the best I could and did not see anything. Second I installed my pressure gauge in the right rear remote. Pressure was bouncing between 500 and 600 PSI. After a lot of instruction from Jim I backed off the de-stroke (item 6 in Jim’s screen shot or Item 43 in the diagram of a 40 CM3 pump) about three or four turns. Then with engine idling for about 2 to 3 minutes I slowly turned the de-stroke back in. At some point I noticed the pitch of the pump changed, and the pressure started climbing. At that point I had 800 psi and stable. I slowly continued to return the de-stroke into its original place and my pressures came up to 2350 psi. At that point I went under the tractor and backed off the stroke control valve to return the pressure to 2250 psi. From looking at the manual I believe this was the correct pressure setting. With the tractor at full throttle, the pressure was about 2325 psi.

Thanks to Jim first and to all of you who replied. I was able to get my tractor up and running and I truly appreciate all of your input. I hope this helps someone else in the future.

God Bless

 

[DLHWoodstock]

HYDRAULIC PUMP MODEL NO. 34PP1 40 CM3 (2.4 IN3) - ST230612​