Brother MFC8420 Service Manual page 190

3) Remove the pad holder and the separation pad spring from the paper tray.
4) Remove the bearing R.
5) Remove the paper pick-up roller ASSY.
6) Remove the two roller collars from the paper pick-up roller ASSY.
Paper pick-up roller ASSY
Roller collar
Bearing R
2
Pad holder
Fig.5-22
Roller collar
1
Fig.5-23
5-13
MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN
Separation pad spring
SERVICE MANUAL