[jdm]

i bought a 01 2388 this year 1000 hrs AFX does beautiful job of harvest but had to have the hydro replaced after wheat and now it is bypassing again can't run in 2nd gear without using 4wd. Are these hydros all weak? I have run JD hydros for 30 years and never had one fail. This was a 2 speed hydro new not rebuilt with pump replacement by dealer.

 

[matt]

check or cap the foot&inch valve. this is @ the clutch pedal, or they didn't clean you hydro system when they replaced the bad hydro?

 

[jdm]

system was cleaned well and the foot valve checked the hydro has never seamed as solid as the JD hydro. We don't even run tank extensions and single tires. I don't know how the combine would even move with all that on it. If you pull over on the highway to let traffic pass you can't hardly get it to take off in 3rd gear.

 

[kthwht1680]

I don't know if the hydro on a 2388 is the same as the 1480. But my dealer recommended changing both the hydro motor and the pump because they tell me you can't hardly get the pump cleaned out if the motor goes bad or vice versa. If they have both and you didn't change both I would there is a good chance this is your problem.

 

[matt]

you do have a problem get your dealer or someone to put a set of gauges on the system,we had this problem on the 97, 2188s internal bypass set too low, see how much pressure you get @ bypass of system?

 

[marshall]

In 3rd gear if you push the stick forward fast you should make the motor grunt a bit and drop almost to the point of the alarm going off . yes put a set of guages on that will tell you a lot .

 

[bigdumbmech]

On the Hydro Drive motor there is a low pressure relief Valve Change that out. I will Bet a shinny new Nickel thats whats going on!!

 

[apmech]

The hydros on 23xx machines are quite robust - we rarely replace them unless there is an outside cause (dirts, overheating, lack of oil, etc.). As suggested above, consider testing the charge pressure, relief pressure - both forward and reverse, and amount of case drain flow. It is quite likely that the solution will not require a new hydro. If the old hydro had a metal-making end of life, decontamination is extremely difficult.