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3112h with a #501 mower

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hi all just finished a restoration of a 42' mower deck mfg#990501 for my 3112h. I have a few questions first off i was wondering if the blades have to be "timed" so that they dont leave spaces, i noticed a few gaps in the swath that the unit left. Also i orderd (from the manual) what i thought was the correct mower to PTO belt simp # 174911 but it was too short. I was abel to use an old belt i had but it only fits on the smaller of the 2 pto pulleys. If anybody out there has a clue as to what belt # i need for this uniti would appreciate it

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This problem raises some confusion. In my belt book, the 3112H with the 990501 42" mower deck, calls for the #174911 belt. This is a 1/2" X 44" belt. In the Allis section, the 3112H's counterpart, the AC HB-112, it calls for a 1/2" X 48" belt with the 42" deck. The blades do not need to be timed. Since you were using the small pulley, you were running the deck at less than half the proper speed. That is most likely the reason for the gaps left in your path. Pat

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