This is an older post, but I just had the same question because I have the same 3HP motor. I contacted Minn Kota and received this:

Ryan O. (Minn Kota)
Mar 16, 2023, 3:44 PM CDT

Hello,

It is a 34# thrust trolling motor.

Thank you for contacting Minn Kota,
Ryan

Mar 16, 2023, 3:33 PM CDT
It is a 3 HP Quiet Power that I purchased in 1990 or 1991.
Thank you
Frank