![]() If I wanted easy, I would've purchased a newer grader that runs well. ![]() ![]() Then either modify the cummins bellhousing, or adapt the CAT bellhousing to the cummins, or simply fabricate a new bellhousing - to join the cummins with the CAT 12 transmission - while maintaining the proper geometry & spacing of the stock components. I would need to find a replacement engine making comparable horsepower and torque, with lots of rotating inertia - perhaps a Cummins NHC-250 would work well? The easiest path forward would be to adapt the stock D318 clutch & flywheel to the cummin's crankshaft. Then there's also the direction of crankshaft rotation, which I assume to be clockwise (looking at the water-pump end of the crank (direction also supported by the left-hand threads on the crankshaft pulley bolt). There's a clutch brake - presumably to stop the clutch-disk for shifting gears (no syncros within the transmission?) There's also a mystery bellhousing bolt pattern - presumably CAT unique, and not SAE (no one seems to know). And there's an outer transmission shaft that's clutch-coupled - for driving the wheels. Presumably there's an inner transmission shaft that's direct-coupled to the crankshaft (no clutch, always turning) - which powers the machine accessories. Forgive me for speculating again (my grader service manual hasn't arrived yet - I might have to reorder it) ![]()
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