Brother GT-3 Series Service Manual page 188

5.
Cut the Band (4) with the nippers and remove the Pump Tube (3) from the T Plug (5).
(5)
6.
Remove the two Screws (7) that fix the Pump Rotor Holder (6).
(5)
7.
Remove the Pump Rotor Holder (6) by lifting the left edge to your side by 2mm.
(5)
(4)
(6)
(3)
(3)
(6)
(3)
(7)
GT-3 Series
6. Replacing Parts
179