Echo QV-680 Instruction Manual - Maintenance
18
QV-680
Inspect and adjust chain brake
(After Each Use)
CAUTION
If proper brake adjustment cannot be
obtained, take your unit to your authorized
ECHO servicing dealer before further use of
system.
1. Remove the sprocket guard.
2. Remove the bar and chain.
3. Remove the guide bar plate from the sprocket
guard.
4. Loosen the adjuster screw and then turn the
adjuster to set a correct tensioning location.
5. Inspect clutch drum and brake band for wear
and replace if necessary.
6. Reinstall the guide bar plate in the sprocket
guard.
7. Reinstall bar and chain.
8. Install sprocket guard.
9. Set chain tension. See “Adjust chain tension” in
this section.
10. Activate the chain brake with the guard and
with a gloved hand try to pull the chain along
the top of the guide bar.
11. Move chain with hand guard in unbraked
position.
12. Start the engine.
13. Depress throttle fully and activate the brake.
MAINTENANCE
WHAT HAPPENED?
Chain Moves.
Chain Does Not Move.
WHAT DO YOU DO?
Increase Tension.
Go to Next Step.
WHAT HAPPENED?
Brake Spring Rubs on
Drum.
Chain Rotates Smoothly
without Drag.
WHAT DO YOU DO?
Decrease Tension and
Go to next Step.
Go to next Step.
WHAT HAPPENED?
Chain Slows to a Stop.
Brake Spring Rubs on
Drum.
Chain Stops
Immediately.
WHAT DO YOU DO?
Increase Tension.
Decrease Tension.
Brake is Adjusted
Properly.
NOTE
• Move the chain brake lever (Front hand guard)
fully rearward to remove or install the clutch
cover to chain saw.
• Clean parts as you remove them.
Adjuster
Brake band
Direction to tension
↓↓↓↓↓
↑↑↑↑↑
1 mm
Adjusting brake band
Adjuster
Cover
Mark
Brake band