Echo HCA-2620/S Operator's Manual page 39

HCA-2620/S
Use new lock nuts each time blade guard is installed. See dealer for
correct nuts.
7. Lubricate blades (see "Lubrication").
8. Connect spark plug wire.
Adjustment
Level 2.
Locking ability of hedge trimmer blade lock nuts will diminish each
time they are removed. Replace if turning resistance is not felt when
installing lock nuts.
1. Tighten blade screws securely.
2. Hold blade screws (A) to
prevent turning, and tighten
lock nuts (B).
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B
A
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