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I don't know the 5015 but if it's a pump up coming off the front of the crankshaft, they are pretty common. YT used to carry them but I didn't see them just now, should check yourself or call them. Northern had them for up to mid-size machines, and yours is smaller than that, I replaced one for a friend and bought it that way. Had to make the mount but that wasn't that hard. If it's all integral, you might be doing a tear down and figuring out as you go. A lot of us have done that with the older machines since the pumps are very unique and usually it becomes obvious where the problem is, like foreign particles where they don't belong. I wouldn't know if it has separate or integral cylinders but you might see if the cylinders or valves are giving problems before spending the money. Does it leak down when you raise it and shut it off. If it helps in looking up parts, the actual manufacturer was Toyosha and it was marketed under a Hinimoto brand. That comes from Norm Swinefords book. I'd bet that means there may be OEM stuff available though possibly not in the US. Post if it is a separate pump, if it has cylinders or the lift arms are part of the rear castings and we'll give as much help as we can.
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