Chain Brake - Efco MT 3700 Operator's Instruction Manual

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MAINTENANCE
• Remove the cover (C), diffuser (D) and muffler body (E).
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• Clean and inspect the spark arrester screen (A).
• Reassemble components in reversed order of removal and
torque the muffler screws to 70 in/lbs (7.9 Nm).
WARNING: If the spark arrester screen is damaged,
faulty or deteriorated, replace the entire muffler
assembly.
The Spark Arrester System needs a periodic and accurate main-
tenance and cleaning, in particular:
- check periodically the spark arrester screen and substitute it
when holes, bends or deformations appear;
- check carefully if dust, debris or organic material is in contact
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with parts of the Spark Arrester System; check especially the
gap between the muffler and the shield; clean it often with tools
or shop air.
For compliance with the standard, one spiked bumper p.n.
50170074 (A, Fig. 94) have to be mounted, as provided on the
chainsaw in the box.
WARNING: Do not operate your chainsaw if the muffler
is damaged, missing or modified. An improperly
maintained muffler will increase the risk of fire and
hearing loss.

Chain Brake

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If the chain brake does not work properly, remove the clutch cover
and clean the chain brake components. Check for wear on the
brake band (A, Fig. 95) and replace if worn or deformed.
WARNING: If the brake band is worn too thin it may
break when the chain brake is triggered. With a
broken brake band, the chain brake will not stop the
chain. The chain brake should be replaced by an
authorized service dealer if any part is worn to less
than 0.02" (0.6 mm) thick. Repairs on a chain brake
should be made by an authorized service dealer. Take
your unit to the place of purchase if purchased from
a servicing dealer, or to the nearest authorized service
dealer.
Always keep the chain brake mechanism clean and lightly lubri-
cate the linkage (B, Fig. 96).
Always test the chain brake performance after servicing or
cleaning per the Operation - Chain Brake Section.
WARNING: Check and, if damaged, replace the chain
catcher / safety stop (C, Fig. 95).