JD 4520 Losing power in C range

[rjm5133]

i have a jd 4520 with 600 hours on it. runs strong in A and B range but has no power in C. it used to go down the road at 15 or 16 mph now runs at 10 tops and slows to 4 or 5 mph on the slightest incline. engine never blogs down more than a hundred rpms and like i said runs fine in A and B and has plenty power in the loader and 3pt hitch

any one else have this problem or have any idea what the issue could be.

any help is much appreciated

 

[RogerH]

Turn off the Load Match feature (your operator manual should describe how to do that) and see if performance improves. If it does, then I would suspect the throttle sensor may be out of adjustment.

 

[KB9UDE]

Possible plugged fuel filter

 

[Cidertom]

Had similar issue on my 4520. My issue was the pressure that drives the hydraulic clutches. (power rev) Dealer shop adjusted it and all better now. It would slip in c or if I was digging into a pile with the fel.

Attached is a drawing of the clutch circuit.

 

[DanD78]

Is it stuck in 4wd? I would also check the load match setting like suggested before. My 3320 would keep the RPMs up and the tractor would slow down. It keeps you from lugging the engine. I added the cruse control option so you didn't have to go through button pushing to turn the load match on and off.

Dan

 

[Cidertom]

Did you ever get this resolved?