Replacing The Sprocket; Replacing Carbon Brushes - Makita DUC252 Instruction Manual

After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
014344
Remove any projecting material, however small,
with a special flat file (optional accessory).
Round off the front of the depth gauge again.
Cleaning guide bar
010924
Chips and sawdust will build up in the guide bar groove,
clogging it and impairing oil flow. Always clean out the
chips and sawdust when sharpening or replacing the
saw chain.
Cleaning the oil discharge hole
Small dust or particles may be built up in the oil
discharge hole during operation.
Small dust or particles built up in the oil discharge hole
may impair the oil discharge flow and cause an
insufficient lubrication on the whole saw chain.
When a poor chain oil delivery occurs at the top of
guide bar, clean the oil discharge hole as follows.
Remove the battery cartridge from the tool.
Remove the sprocket cover and saw chain from the tool.
(Refer to the section titled " Installing or removing saw
chain ".)
014671
1. Slotted
screwdriver
1
Remove the small dust or particles using a slotted
screwdriver with a slender shaft or the like.
Insert the battery cartridge into the tool.
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.
Reinstall the sprocket cover and saw chain on the tool.

Replacing the sprocket

1
010927
Before fitting a new saw chain, check the condition of
the sprocket.
CAUTION:
A worn sprocket will damage a new saw chain.
•
Have the sprocket replaced in this case. The
sprocket needs to be installed so that it always
faces as shown in the figure.
1
2
014715
Always fit a new locking ring when replacing the
sprocket.

Replacing carbon brushes

001145
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
17
1. Sprocket
2. Locking ring
2
1. Locking ring
2. Sprocket
1. Limit mark
1