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Hi Shawn, I recently added a standard AC-B hydraulic pump to my '42B that never had one. The key things to look for are you need the PTO/belt pulley assembly, it has to have the opening for a hydraulic pump (some early ones did not) and that the PTO shaft has to have the two cam lobes to drive the hydraulic pump pistons. My '42B had the power take off assembly, the assembly had the opening (it was blanked off) and the PTO shaft, even though it was the early 1-1/8 x 6 shaft, had the cam lobes on it. For me, adding the standard AC pump was a simple bolt-on job. I got a pump from Ebay that included the operating lever. It did not include the two clips that support the operating lever from the seat frame but I was able to come up with my own custom means to mount the lever. If your tractor uses the early heavy weight transmission oil (SAE90) you will need to drain the transmission, the differential and the PTO assembly (three plugs) as they are a common sump and the hydraulic pump uses the same oil for a working fluid. Flush the area out and install a combination transmission/hydraulic oil (I used Amalie All-Trac 245 which is a SAE 10W-20 combination oil). Once you have the hydraulic pump working, you will need to get one or more cylinders and the necessary linkage mechanism for whatever implements you want to lift. The cylinders come up regularly on Ebay. The linkage mechanism part(s) may be more difficult to find and you may have to cobble something together yourself. That's possible - I 've done just that for the belly sickle mower assembly. On manuals, I recommend both. If you can only have one, then get the original AC one. It is far preferable, in fact necessary, if you want to troubleshoot that hydraulic pump. The I&T manual is inferior in that respect.  Rod
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