Efco MT3700 Troubleshooting Manual page 2

!
WARNING: Never touch or adjust the chain while the engine is running. The saw chain is
very sharp! Always wear protective gloves when performing maintenance to the chain.
Problem Possible Cause
Engine starts and Chain brake engaged
runs, but the chain
Chain tension too tight
is not rotating
Guide bar and chain incorrectly
assembled
Bar and chain Bar and chain oil tank empty
running hot and
Chain tension too tight
smoking
Oiler not functioning
Poor cutting perfor- Chain installed backwards
mance
Dull or damaged chain
Solution
Release chain break, see Fig. 5.
Properly adjust chain tension:
1) Loosen the guide bar nuts (A) slightly, see Fig. 6.
2) Turn the chain tensioning screw (F) counter-clockwise to
loosen chain tension, see Fig 7.
3) Lift the tip of the guide bar up to check for chain sag, see
Fig. 8. Release the tip of the guide bar and turn the chain
tensioning screw (F) 1/2 turn clockwise, see Fig. 7. Repeat
this process until sag does not exist.
4) Hold the tip of the guide bar up and tighten the bar nuts
securely, see Fig. 9.
5) The chain is correctly tensioned when there is no slack on
the underside of the guide bar, the chain is snug, but it can
be turned by hand without binding, see Fig. 10.
Refer to Owner's Manual for proper instalation.
Fill oil tank with bar and chain oil.
Properly adjust chain tension following the instructions
above.
Run at full throttle for 30 seconds. Stop saw and check for
oil dripping from guide bar. If oil is present, the chain may be
dull or the guide bar may be damaged. Have chain sharp-
ened or replace chain and guide bar as needed. If there is no
oil then contact servicing dealer.
Properly install chain on guide bar. The cutters on the top of
the guide bar should face toward the bar tip, in the direction
of the chain rotation, see Fig. 11. Refer to Owner's Manual
for proper installation.
Inspect chain for dull or damaged cutters. Have chain sharp-
ened or replaced as needed.
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