Mf 1210 4WD with hydrostatic trans NEED HELP PLEASE

[phil21]

I bought a MF 1210 deasel 4x4 and it runs great but while I was using it. It started slowing down more and more. So I replace all filters and fluids and started it up and it done great for a little while and then slower and slower I am at a lost. It has two pumps one runs off engine and the other is under belly before trans Any and all help is greatly taken thank you o and all other hyds. work great front end loader 3 point hitch it does not affect them

 

[Farmerford]

You have not given us much to work on. But my first wild guess is that the hydrostatic transmission has wear in either or both the pump and the motor. Each is a piston type hydraulic device and if the clearances betweem the cylinders and pistons are significantly wider than when new because of wear, then as the transmission fluid warms up it becomes less viscous (thinner) and escapes more easily through the excessive clearance.

That should not happen for many hours; certainly it should not happen for a few thousand hours or more unless the tractor was abused by being overheated or dirt was introduced into the hydrostatic system.

If you are lucky it may be something less serious, like a malfunctioning pressure relief valve in the hydrostatic system.

The best way to diagnose it is to test the pressures in the hydrostatic system. If you have a shop manual it will identify the test port locations and pressure specifications.

Good luck.