boataddict
Well-Known Member
The Hurth HSW 450 D, from what I can find, should hold 2.12 quarts (two liters). If the fluid is clear you are probably OK but one thought was water in the bottom of the gear raised the fluid level after it phase separated. Water source could be the transmission fluid cooler. (Not sure if your cooler is on the suction or discharge side of the raw water pump.) Here is the link where I found the capacity: https://www.simplicity-marine.com/ZF/ZF45C/Technical.htm
Not trying to be an alarmist but water, if present, doesn't need to be left in the gear over the winter.
Note, a ZF 45C is the same as a HSW 450 D per the top of the page (and the link).
The transmission fluid is completely clean and fresh, no water in it thankfully. I suspect I still had about a quart or so of transmission fluid still left in the system before I refilled it, as I did not suck the fluid out of the cooler itself, only the transmission which I had already completely disconnected.