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Hydro troubleshooting

S

Spectre168

New User
I have a 656-D Hydro Utility.

The hydro seems to work okay whn not under load and when it is cold. Once it warms good and through, the drive seems to lose power to the point that the tractor will hardly move itself. The PTO will run and then drop out on level ground. The oil is fresh with a new filter. The oil level appears to be correct.
My next move is to go through the linkage adjustments and try to get them back to specs.
This is my first experience with a hydro, and I'm looking for ideas of where to proceed next. Any thoughts or suggestions would be appreciated.
 
(quoted from post at 12:12:12 06/18/11) I have a 656-D Hydro Utility.

The hydro seems to work okay whn not under load and when it is cold. Once it warms good and through, the drive seems to lose power to the point that the tractor will hardly move itself. The PTO will run and then drop out on level ground. The oil is fresh with a new filter. The oil level appears to be correct.
My next move is to go through the linkage adjustments and try to get them back to specs.
This is my first experience with a hydro, and I'm looking for ideas of where to proceed next. Any thoughts or suggestions would be appreciated.
Click to expand...

How are you checking the oil? The PTO dropping out after a little bit of running suggests to me that you are checking the oil level without having the engine running. When a hydro runs it fills the hydro section of the tractor completely full of oil. The oil pickup tube is between the rear axles. If the oil level is at the full mark with the tractor not running it will be seriously low while in operation. That could explain both of your problems.

To check the transmission/hydraulic oil in a hydro the engine needs to be running for at lease two minutes before you check the level.
 
Tried that, The oil level now shows approx. 2" above the full mark. No change in the machines behavior. i'm going to grab the books and start setting all the linkages and such to tolerance, or as close as I can get. See what happens, and go from there.
Thanks for the tip.
 
Other than to share a common oil reservoir there is little to connect the Hydro unit and the PTO. The fact that they fail together when the oil gets warmed up leads me to think the problem is still with the oil. Other than oil level another cause for your problems may be the oil getting air trapped in it. The 656 series tractors have a hose running down from the hitch reservoir to the oil pickup tube. It is there to keep the oil from dropping from the hitch reservoir down to the oil in the rear housing. When oil is dropped like that it can draw air down into the oil as it mixes together and cause foaming. Check to see if the oil on the dip stick show evidence of foaming after the oil is warmed up. If it is you may have a bad hose in the rear housing.
 
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