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On this 2188 I just bought recently, I thought I would go test a little bit of ground which I had planted some certified wheat last fall. I figured it had some sprouts and low test weight, which to my dismay was correct!
Anyway, in 3rd gear going down the road, when I first push the hydro lever forward, there is a whinning noise coming from, sounds like directly underfoot. Once it gets up to speed a bit it quits. I dont notice this in 1st or 2nd. I am going to check the hydraulic fluid tomorrow to see if it possibly could be low, and/or check to see when the filters have been changed. Any other ideas?
thanks,
Jim
 

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Mine does that. It probably is a Hydro relief valve that is doing it's job....keeping things from building too much pressure on the system untill the combine get up to speed in road gear.
Next season, I'm going to install an Attenuator on mine (95's didn't have it) to get rid of the annoying "honking" sound I hear when running at field speed. Sounds just like someone honking at you, wanting to to go around you.
 

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As trakman said, it is the relief valve doing what it is there to do. When I'm on the road, I usually put the throttle up to the middle spot, then take the hydro lever forward until it is all the way up, slow enough to not make it whine all the time, then start bringing up the engine RPMs until I'm at full speed.

You will also hear the whine if you drive up a steep hill while on the road, even if you are already at full speed.

If you have RWA, then you can turn that on when first starting out in 3rd gear. It will get you up to about 10MPH, then shut the RWA off, and you'll go up to about 20MPH.
 
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