Porta One / Porta Two motor markings

Dan H

New Member
Feb 9, 2016
Gear owned
Porta One, Porta Two
The capstan motor in my Porta Two (standard speed model) seems to have died. First it started running slow, then I went out of the room to make a cup of tea and came back to find that it had stopped altogether with the smell of hot motor in the air :(. As a test, I applied 9V from a PP3 battery to the +/– terminals; there was a faint noise but no rotation. This contrasted with the healthy rotation that the same procedure produced in the motor of my backup portastudio (a Porta One).

So, it looks like I need to replace the motor but I am confused about the markings on the outside:

The failed Porta Two motor is marked Sankyo SHW2R-00-1X01A.
My Porta One motor is marked Sankyo BFV2R34 180811-A (and is somewhat larger).
Elsewhere online, I have seen a Porta One motor marked Sankyo SHW2R 00-205A.
The Porta One service manual indicates TEAC part number 5760645900, which may or may not be the same for the Porta Two (I do not have a Porta Two service manual but would be very grateful for a copy).

Are all these motors equivalent? What is the significance of the characters that follow the 'SHW2R' part? Can anyone recommend a modern-day replacement? What is the general specification of the motor?

Many thanks for any help that you can give.

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