Something is wrong, it should have no problem. The 1782 should have the large PTO pulley on it and an early Haban would have the small deck pulley so you already have it sped up. I'm running an early Haban on my 2182 but I changed the deck pulley to the late style to slow my deck down. I can drop the engine RPMs down to about 1/2 and it still cuts good. Are your baffles in place?
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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