Echo CS-300 Instruction Manual page 20

• Place the depth gauge tool firmly on guide bar so that depth gauge protrudes. Then file top of depth gauge with flat file
until flat with top of the gauge tool.
- Be sure to round off the front edge of the depth gauge.
Depth gauge tool
• Properly filed cutters are shown below.
(Top plate angle)
30°
• When setting of the chain is finished, soak it in oil and wash away filings completely before using.
• When chain has been filed on the bar, supply sufficient oil to it, rotate the chain slowly to wash away the filings before
using again.
• If the chain saw is operated with filings clogged in the groove, the saw chain and the guide bar will be damaged
prematurely
• If the saw chain becomes soiled with resin, for instance, clean it with kerosene and soak it in oil.
CHAIN TYPE AND SPROCKET PITCH
Saw chain should be used with corresponding pitched
sprocket. To identify chain type and pitch of sprocket,
check as follows.
• Chain type number (A) is stamped on drive link.
• Sprocket pitch (B) is stamped on clutch drum.
Remove
until flat
with tool
(Side plate angle)
85°
(Top plate cutting angle)
60°
(DRIVE LINK)
Number
indicates Chain
91
type
A
20
Round
off the
edge
(Depth gauge)
0.64 mm (0.025")
Parallel
(SPROCKET)
91S
Number
indicates
Chain type
B