TROUBLESHOOTING

! WARNING

Unplug chain saw from power source before servicing. Severe injury or death could occur from electrical shock or body contact with moving chain.

OBSERVED FAULT

POSSIBLE CAUSE

REMEDY

Saw runs, but does not cut.

Chain assembled backwards on guide bar.

See Replacing Guide Bar / Saw Chain, page 11.

Saw does not cut unless heavily forced.

Chain is dull.

Cutting produces only sawdust with few

 

large chips.

 

See Sharpening Your Saw Chain, page 12.

Saw runs slow. Saw stalls easily.

Low power supply voltage.

Extension cord wire size too small. See

 

 

Extension Cords, page 6.

 

 

 

Motor of saw does not run when you

Switch lockout not pressed in to release

Press in switch lockout before squeez-

squeeze trigger.

trigger.

ing trigger.

 

Chain brake activated.

Release trigger and move front hand

 

 

guard back towards rear of saw.

 

Extension cord connections

Check cord connections.

 

loose.

 

 

Open line fuse or circuit

Check line fuse or circuit

 

breaker.

breaker.

 

Bad motor brushes.

Contact authorized service person.

 

 

 

Motor of saw runs, but chain does not

Open wiring circuit on saw.

Contact authorized service person.

move.

 

 

 

Gear train failure.

Contact authorized service person.

 

 

 

Chain does not get oil.

Clogged oil slot in guide bar.

Remove guide bar and clean oil slot.

 

Oil is too thick.

Use correct weight of oil. See Filling

 

 

Oil Tank, page 5.

 

 

 

Chain comes off guide bar.

Chain is loose.

Tighten chain. See Saw Chain Tension

 

 

Adjustment, page 10.

 

Guide bar and chain not assembled

See Replacing Guide Bar / Saw Chain,

 

right.

page 11.

 

 

 

Saw smokes.

Saw damaged. Do not use saw.

Contact authorized service person.

 

 

 

Saw leaks oil.

Oil cap is not secure.

Tighten oil cap.

 

 

Note: Empty oil tank when not in use.

 

 

 

Chain brake does not stop saw chain.

Brake failure.

Contact authorized service person.

100549

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Image 15
MasterCraft 100524-01, CS-120CB owner manual Troubleshooting, Observed Fault Possible Cause Remedy

100524-01, CS-120CB specifications

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