flynavy
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D750 Engine
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North Idaho Wolfman
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This is just spitballing because I've never found an exact answer.
I do believe the AH was A for agriculture and H for Hydrostat.
It was just a way of stating changes in the external parts on the engines.
So basically you can swap out a D750AH for a D750B without any issue if you use the oil pan, oil pickup, and front gear case cover.
And as a matter of fact you can even change it for a D850 or D950, and those three parts will fit on them without issue, along with any other external parts needed like intake and exhaust manifolds.
One thing to note is swapping to some of the D850's and most if not all of the D950, you either swap out the front gear case cover and water neck or you will have to change the inlet and outlet pipes on your radiator because the water pump version will have smaller intake and output hoses.
I do believe the AH was A for agriculture and H for Hydrostat.
It was just a way of stating changes in the external parts on the engines.
So basically you can swap out a D750AH for a D750B without any issue if you use the oil pan, oil pickup, and front gear case cover.
And as a matter of fact you can even change it for a D850 or D950, and those three parts will fit on them without issue, along with any other external parts needed like intake and exhaust manifolds.
One thing to note is swapping to some of the D850's and most if not all of the D950, you either swap out the front gear case cover and water neck or you will have to change the inlet and outlet pipes on your radiator because the water pump version will have smaller intake and output hoses.
I spent at least 30 minutes on the google, and all I could end up with was AH designates what options the engine had, but couldn't find out specifically what AH is. I'd like to know myself if you find out.