Mower Belt

how to repair my MTD riding mower lower deck belt?

I've replaced new blades. the belt is good on the lower deck. When I engage the handle to cut, the front engine pulley produces smoke. it spins as it should, and the 2 rear idler pulleys spin also. Why is the engine pulley not engaging the belt correctly? Is it that the Belt keeper pins are out of alignment?
I have searched the web with no success. I know there is a simple answer to this problem.

The belt guides keep the belt on when the deck is disengaged. Are you sure that the blades turn freely? They have to spin smoothly and freely. The spindles have bearings which could be worn and binding.

KEVLAR BELT FOR MTD 754 0430 954 0430B 754 0430 754 0356 954 0356 Set Of 2
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Oregon Wheel Drive Belt for Husqvarna36 48Walk Behind 539101956
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CRAFTSMAN HUSQVARNA MOWER DECK BELT 144959 532 14 49 59
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Murray 37X102 Motion Drive Belt
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Pix With Kevlar Replaces John Deere Belt M119539
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Pix Replaces John Deere Belt M47765
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Great Dane Replacement Belt D28028
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Husqvarna Replacement Belt 539 10 92 42
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REPLACEMENT BELT FOR SIMPLICITY 1672135SM
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