Are you saying the engine BOGS down? Or that the tractor just does not have the power to do work that it used to? How's the general maintenance been, Hydraulic system purged, engine tuned up, engine timing set, air filter replaced, Possible new carb, if throttle shafts are worn, etc
So new to me tractor, newer hydraulic pump and oil from previous owner. My issue is I here all the stories on what people are doing with there tractor and mine I cant move dirt or lift very much because my engine bogs down and just about stalls out
New OIL? do you know what type of oil they put into it?
New pump? If the pump is OVER sized for that 14 HP engine, its going to bog it down when the pressure climbs.
Old Kohlers often wear down the push rod for the points, which makes the engine timing changes. On the 10 HP Kohler in my '68 Case 155, I had to modify the points mounting to be able to adjust the .020 opening. I need to get into the engine some day and replace the push rod. Good information and replacement Kohler parts on Brian Millers Web site: Ignition Solutions for Older Small Engines and Garden Pulling Tractors
If seems to be Engine then you have somewhere to focus first.
All engines need air, fuel and Timing to work. And in the right ratios.. If the carb is old and worn it can suck air in past the throttle shafts and lean out the fuel. If the Carb flanges and gasket are not flat, it can leak air there too. If the air filter is clogged then you might not get enough air.
If the push rod for the points is worn, the timing could be off. Valve lash probably needs adjustment.
I know on the Onan Twin cylinder engines we do a regular "decarbon" of the engine, which is pull the heads, clean - scrape all of the carbon off the piston, valves, heads, etc and check valve lash, new gaskets re-assemble.. Might be a place to start on that Koher as well.