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I'll have to ride around without the mower to check any bogging with just the hydro. However, the engine is pretty much loafing at that point so the governor doesn't call for much fuel.

The local JD tech is not much help. The diesel injection shop (three shops actually) was much more helpful. They seem to know their Yanmar stuff pretty well. The one thing we know for sure is there is no smoke at all when bogging down. That points to fuel starvation. The $64 question is why. Injectors excellent. Injection pump excellent (removed and tested). Supply pump excellent. Fuel filter new. Fuel tank clean. Excellent fuel flow to the inlet of the injection pump. Either the governor is failing to call for fuel (unlikely since that is just a spring for more fuel vs. weights for less fuel - and the spring seems good)or something is preventing full rack travel. But the injection pump is good and the rack is free.

I'm still intrigued by another posting that says to check hydraulic filters and screen. Will do that next. Does a dirty hydraulic filter or screen really load things up that much?

755 Low power
John Deere Tractors
Replies 14 Post by Johnln

Hydros actually pull stonger than gears. A clutch will slip long before hydro pumps run out of pressure. All big earthmovers, dozers, etc. use hydrostatic.

Hydro pulling power
John Deere Tractors
Replies 49 Post by Johnln