Guide Bar And Chain Combinations - Echo CS-4920 Operator's Manual

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CS-4920
Bucking
Bucking is the sawing of a log or
fallen tree into smaller pieces. There
are a few basic rules which apply to
all bucking operations.
• Keep both hands on the handles
at all times.
• Support logs if possible.
• When cutting on a slope or
hillside, always stand uphill.
Keep in mind that the wood is heavy and that it will bend and pinch the saw
if improperly supported. The trunk will weaken at the point where you make
the cut unless the tree is lying on perfectly flat ground or supported as
shown. If you make the cut with the tree on the ground, don't let the saw's
chain dig into the earth; it is harmful for the saw, and you stand a good
chance of being struck by flying debris.
To cut the trunk, use the bucking and two-cut sequence shown. The first cut
should be no deeper than one-third the trunk diameter.

Guide Bar and Chain Combinations

The following combinations are recommended for model CS-4920:
Guide Bar
ECHO Part No.
Length
mm (in.)
Low-kickback
406 (16)
16BOAD3366
457 (18)
18BOAD3372
508 (20)
20BOAD3378
X7503352100
© 09/2022 ECHO Incorporated
Finish cut
First cut
Saw Chain
Pitch (in.)
20BPX66CQ
0.325
20BPX72CQ
20BPX78CQ
OPERATION
Uphill Position
Support
Type
Links
66
72
78
41

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