Adjust Chain Brake - Echo QV-680 Instruction Manual

Inspect and adjust chain brake
(After Each Use)
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.
QV-680
MAINTENANCE
CAUTION
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
Adjusting brake band
↓ ↓ ↓ ↓ ↓
1 mm
↑ ↑ ↑ ↑ ↑
Brake band
WHAT HAPPENED?
Chain Moves.
Chain Does Not Move.
WHAT HAPPENED?
Brake Spring Rubs on
Drum.
Chain Rotates Smoothly
without Drag.
WHAT HAPPENED?
Chain Slows to a Stop.
Brake Spring Rubs on
Drum.
Chain Stops
Immediately.
18
Cover
Brake band
Mark
Adjuster
Direction to tension
WHAT DO YOU DO?
Increase Tension.
Go to Next Step.
WHAT DO YOU DO?
Decrease Tension and
Go to next Step.
Go to next Step.
WHAT DO YOU DO?
Increase Tension.
Decrease Tension.
Brake is Adjusted
Properly.