Replacing The Sprocket - Makita BUC121 Instruction Manual

1
008579
Remove the push nut using a slotted bit screwdriver
with a slender shaft or the like.
1
008580
Take the filter out of the chain saw and remove small
dust or particles from it. When the filter is too dirty,
replace it with a new one.
Insert the battery cartridge into the tool.
008581
Pull the switch trigger to flow built-up dust or particles
off the oil discharge hole by discharging chain oil.
Remove the battery cartridge from the tool.
008582
Insert the cleaned oil filter into the oil discharge hole.
When the filter is too dirty, replace it with a new one.
1. Push nut
2
2. Slotted bit
screwdriver
1. Filter
1. Filter
1
008635
Insert the push nut with its correct side facing up as
shown in the figure into the oil discharge hole to secure
the filter. When the filter cannot be secured with a
disfigured push nut, replace the push nut with a new
one.
Reinstall the sprocket cover and saw chain on the tool.

Replacing the sprocket

Before fitting a new saw chain, check the condition of
the sprocket.
1
008584
CAUTION:
A worn sprocket will damage a new saw chain.
•
Have the sprocket replaced in this case. The
sprocket need to be installed so that it always
faces as shown in the figure.
008586
Always fit a new locking ring when replacing the
sprocket.
12
1. Push nut
1
1. Sprocket
2. Locking ring
2
1. Locking ring
1
2. Sprocket
2
3. Washer
3