It does sound kinda odd that there's no water pump.
I don't know how familiar you are with the 113/123 motor you've got, so forgive me if I'm telling you something you already know. That's not my intention.
The water pump on the motor, if it's there, is not behind the fan in the middle of the block like most auto water pumps. It's actually at the inlet to the block, connected to the lower radiator hose. A motor without a pump will have a straight inlet there.
If there's a water pump, look at your belts. The rear belt should run straight between the fan pulley and the generator. The front belt, if there is NO pump will run from the crank pulley to the fan and no where else. If there IS a pump, it will be a longer belt that runs between the pulleys on the crank, the fan and the water pump. Standing by the generator and looking, if the forward belt is angled out toward the left side of the tractor and runs close to the inlet to the block, it will be running around the pulley on the water pump.
Another clule would be the brace that holds the top of your generator. With no water pump, that brace will be a straight piece of steel with a slot in it. If there's a water pump (or used to be) that brace will have a curve to it.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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