TO35 Bogging down on grade

My TO35 seems to run good while running the brush hog on level groung but it acts as though it is running out of gas while climbing a grade. Could this be a fuel flow issue or should I look for something else.? Thanks for the help. Doug

Could be a fuel issue. Try partial choke, see if that improves it. If so, it is a fuel problem.

There is a plug in the bottom of the carb. With the engine off, fuel valve on, remove the plug and catch what comes out in a clean glass. It should give a full flow, then slow to a trickle as the bowl empties. If it slows to a drip, or stops, there is a restriction. Check the screen above the sediment bowl, there may be a screen in the inlet fitting of the carb. Also tyr turning the fuel valve on with the sediment bowl off to be sure the valve is not clogged.

Look at what you caught in the glass, look for rust flakes, and water. Not uncommon for the old tanks to be contaminated. If there is trash in the fuel flow, then it's also in the carb. You can usually ease the bowl off and clean it without damaging the gasket.

Other items to check: Be sure the cap is vented. If there is a paper inline filter, that can cause problems on a gravity feed system. If the sediment screen is good, it should not need an additional filter. If you want an inline filter, it needs to be a mesh filter, not paper. The fuel line should be steel, not copper, and routed as directly as possible, downward to the carb, and as far away from the exhaust manifold as possible.

One other item, check the point gap and distributor shaft bushing for wear. A worn distributor will do strange things, points won't stay set.

Check all the things Steve said, good advice,

Old school plowing tip: when plowing as soon as you drop the plows in the ground and pull the throttle back the motor should take the fuel and increase speed to proper plowing rpm which in most cases was almost full Rpms,

If motor would not take the fuel when you pulled the throttle, you would open up the large fuel screw on the carburetor 1/4 turn then try again, most of the time this would provide a richer fuel mixture for the sudden load, normally a couple of 1/4 turns was enough,

When through plowing they would turn the mixture back for more economical operation,

That needle on my old carb has a notch on the cap so you can identify its set location, then gauge how much you turned the knob,