Echo cs-520 Instruction Manual - Adjusting Chain Tension
11
CS-520
5. Mount guide bar on studs and slide toward clutch
to make saw chain installation easier. Install
chain with cutters on top of guide bar facing
forward.
6. Unlock the chain brake, and install the clutch
cover over the guide bar studs. Ensure chain
tension adjuster pin fits into the guide bar
adjuster hole, brake band is positioned around
clutch drum, and tab at rear of clutch cover fits
underneath tab on engine cover. Tighten clutch
cover nuts finger tight.
7. Turn saw over and check brake band for correct
position on clutch drum. If brake band is not in
place around drum, remove cover, make sure
brake is unlocked, and reinstall. Tighten clutch
cover nuts finger tight.
WARNING
Improper clutch cover assembly can result in
serious injury, and will cause severe saw
damage if unit is started. Never start or
operate saw if brake band is not in place on
clutch drum. Always check chain brake
operation after replacing cover. Do not use
saw if chain brake does not function
properly.
ADJUSTING CHAIN TENSION
IMPORTANT
Always loosen clutch cover nuts before turning
the chain tension adjuster, otherwise the clutch
cover and tensioner will be damaged.
1. Remove spark plug lead. (See page 24)
2. Loosen two clutch cover nuts, if necessary.
3. Hold the bar nose up, and turn the adjuster
screw clockwise until chain fits snugly against
underside of the bar.
4. Tighten both nuts with the bar nose held up.
5. Pull the chain around the bar by hand. Loosen
the adjustment if you feel tight spots.
6. When chain is properly tensioned, tighten clutch
cover nuts securely - 20 to 23 N·m (175 to 200
in. lb.).
7. Keep chain properly tensioned at all times.
Adjusting screw
Proper tension
Improper tension
Clutch
Brake band
Nuts
Adjuster pin
Guide bar
adjuster hole
Clutch cover
Unlock chain brake
Direction to tension
the chain
Guide bar studs