I have the T170 also. I just changed the fluid in mine. It was about 1 gallon. I was using a hand pump on a smaller container to pump it in. The pick up tube didn’t reach the bottom of the quart container I was using but 2+ gallons seems like a lot.
It looks like the only way to really drain this thing is to take the bolts off the from. I was just told to be careful because of the 2 speed selector on it. Most of mine drained out when I changed the seals I left it as such. I have a small leak on the front side but I’m just dealing with it for now.
