Engine bogs down at times

[man00]

I've notice while mowing if I lower the blades to say 2 1/2" the engine really bogs down even if the grass isn't so thick. Doesn't seem to have any issues going up a hill or anything like that. This is on a Kubota T1670 15hp ...other than that mower runs fine
thanks

[Skywatcher]

Good Morning, Good Friday Good Man

Moving the machine along the ground, up hill and down hill only takes about 10% to 15% of the engine's available power. Running the mower deck can take up to 90% of the engine's power depending on conditions. I would start by making sure the blades are sharp, installed the correct way up and the underside of the deck is clean. Next I'd check the condition of the spindle bearings, belt tensioner bearings and belt routing (the correct side of guides etc.). Polypropylene bale twine wrapped around the blade spindles can suck a lot of power from the system.

I believe these Kubota tractors run the Kawasaki engines. Check air filter (paper element must be completely dry), fuel filter, fuel flow to carburetor. What brand and grade of fuel are you using and how old is the fuel? I've seen flies in the fuel tank get sucked up into the pickup tube and choke off the fuel supply to the engine, shut unit down for 5 minutes, fly drops out of pickup tube and away the machine goes again. Start with these and let us know what you find.

All the best and happy Easter,

Sky

[KE4AVB]

Actually it is a Kohler CV15; although, Kubota tries to hide it like John Deere does with the Kawasaki unique part numbers.

[thomd51]

everything mentioned before is correct , but one more important thing.........the mower blades must be tilted down in the front at least 1/4 inch....so as the mower moves forward only the tips of the blades contact the grass and cut . if their level the whole blade touches the grass and power is wasted .......if their tipped lower in the back the sides of the blades are trying to cut and you'll get chopped up grass and green juice............inflate the tires evenly....then on a flat surface observe the middle blade....there is always an adjustment in the deck lift linkage ..or in the draft links at the front of the deck.......happy-motoring .