McCulloch Mac 110 - Chain Brake Maintenance; Sprocket, Clutch and Clutch Drum; Automatic Oiler Adjustment

CHAIN BRAKE MAINTENANCE
Ttle clutch D(.lIm and CHAIN BRAKE should be kept as clean
and free of sawdust as possible to allow free movement and
full contact of the brake band. And. as the thickness of the
brake band is important to the effectiveness of the CHAI N
BRAKE. it should be inspected daily for any signs of measur-
• able wear or for any noticeable variation in the thickness of
ihe band. The inspection can be part of the daily preventive
maintenance program of rotating the guide bar for longest
service life (See Preventive Maintenance Schedule). If such
wear is noted the brake band should be replaced by your
McCulloch Servicing Dealer. ®
Your McCulloch Servicing Dealer has wear specifications for
the band and will be happy to advise you regarding the need
to replace the band.
SPROCKET, CLUTCH AND CLUTCH DRUM
You should always install a new sprocket when a new chain is
installed. A damaged or worn sprocket must be replaced with
a new one. The saw should never be operated with
excessive clutch slippage. Evidence of slippage is shown
when the chain moves very slowly or stops and the engine
continues to run. This will result in a rapid and damaging
heat build-up in the clutch and the clutch drum. If the clutch
begins to slip, the saw should be taken to a McCulloch Dealer
for servicing.
SPROCKET REPLACEMENT
1. Disconnect spark plug wire.
2. Remove spark plug using spark plug wrench.
3. Remove the CHAIN BRAKE assembly, bar and chain, and
the starter housing.
4. Lock the crankshaft by holding a V2 inch socket wrench on
the flywheel nut to act as a back-up to the V2 inch socket
wrench on the clutch nut. @@
5. Remove the clutch nut by turning it clockwise, then remove
the dust plate and clutch. @
6. Remove the sprocket and drum assembly and the sprocket
bearing. Lubricate the bearing with a good grade of non-
fibrous chassis grease whenever replacing the bearing or .
the sprocket and drum assembly.
7. Install the bearing, the sprocket and drum assembly, the
clutch, the dust plate and clutch nut.
8. Lock the crankshaft as explained in step 4 above. Tighten
the clutch nut securely by turning it in a counterclockwise
direction.
CAUTION: Do not use excessive force when tightening the
clutch nut. Too much force will loosen the flywheel nut. If
the flywheel nut is loosened during this procedure, see
your McCulloch dealer for corrective maintenance.
The clutch and clutch drum should be kept as clean and free
of sawdust as possible. If sawdust is allowed to build up the
clutch may drag causing the chain to move while the saw is
idling.
AUTOMATIC OILER ADJUSTMENT
The automatic oiler is adjusted at the factory for average cut-
ting conditions. Oil flow may be adjusted, however, for special
conditions or individual requirements. Turn the adjustment
screw clockwise to reduce oil flow and counterclockwise to
increase it. ®
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