Brother T-8421B Instructions Manual page 49

<Applying grease>
Use Brother-specified "Grease unit (SA8837-001)".
1. Using the tube
2. Applying grease
Follow the procedure below to apply grease to the places indicated by arrows on the next page.
Insert the tip of the nozzle
(1) all the way into the hole
in the part.
1. Turn the power switch to "OFF".
2. Remove the screw (2). (Refer to the next page for greasing locations.)
3. Apply grease to each of the holes until the grease overflows slightly.
4. Tighten the screw (2) to push in the grease.
Grease
Apply grease without
letting it spill out.
5. Use a cloth to wipe away any excess grease from around the screw
(2).
6. Apply grease to all locations shown on the next page in the same way.
7. Carry out the reset procedure given on the next page.
NOTE:
Once the grease tube has been opened, remove the nozzle from the
tube, attach the cap securely and store the tube in a cool dark place.
The grease should be used as quickly as possible.
When using the grease again, remove any old grease from inside the
nozzle first.
(Store the tube away carefully once the tube has been opened, otherwise the
grease remaining inside the tube may deteriorate, and this may affect its
lubricating performance.)
2937M
T-8421B, 8422B, 8452B, 8722B, 8752B
9. CLEANING
Tighten the screw to push in
the grease.
4087M
2936M
42