Brother GT-3 Series Service Manual page 140

Replacing the Reduction Belt
Disassembling
1.
Loosen the four Bolt Sockets (1).
2.
Loosen the Nut 2 M4 (2) and loosen the Bolt Socket (3) for adjusting the tension.
3.
Remove the two Ball Bearings Radial 688ZZ and the two Retaining Rings E6.
Prepare the new Retaining Rings, no reuse.
(1)
(3)
(2)
(4)
GT-3 Series
6. Replacing Parts
(5)
131