Hydraulic jerk

[prophet455]

any mechanics that can give a conformation that the wet clutch can drag under cold fluid like this? If not can someone give me a little more detail on teh function of the modulator valve and is this a realistic path to explore?

 

[rancher93]

Any resolution to this problem?
My M5040 just started doing the identical rocking back and forth in neutral as described. Even with the foot clutch pedal fully depressed the tractor rocks back and forth in neutral. My tractor has only 250 hours on it and uses SUDT.

 

[ttowne66]

so far i am told by the dealer to let it go for a while. Basically they dont know what could be wrong either but they are hoping it goes away (especially with the 50 hour change coming up). It is clearly connected to the hydraulic oil being cold. I have further found out it does not do it at 2000+ rpms nor at an idle, just in that 14-1700 range for 20 or 30 minutes. Also much worse in first or second gear. some in neutral and when it 3 or 4 it is hardly noticable at all. Right now my gut says the clutch plates are dragging in the thick oil. Second guess would be the modulator valve is ... well just "not right". This weekend she is going to get worked again so Ill see if it is better or worse after a day of work. I have seen absolute zero effects during operation. In fact it still seems to go away after the hydraulic oil warms up.

Prophet

Gotta love these dealers. Plug ears, Cover eyes and hope the problem goes away on its own. That is awesome information and help! What a joke.