McCulloch PRO MAC 610 - Fuel Tank Filter; CHAIN BRAKE Maintenance; Sprocket, Clutch and Clutch Drum; Sprocket Replacement

FUEL TANK FILTER
SPROCKET, CLUTCH AND CLUTCH DRUM
The fuel tank filter prevents dirt from entering the fuel line to
the carburetor. After a while, dirt will build up on the filter and
will cut down the flow of fuel. Or, if water is permitted to enter
the fuel tank, the water will get into the filter and prevent the
flow of fuel to the carburetor. If any condition affects the filter,
install a new filter. However, if a new filter is not available the
filter can be cleaned for temporary use.
1. Remove the fuel tank cap and lift out the free end of the fuel
line.®
2. Pull the filter off with a twisting motion.®
3. Wash the filter in a clean solvent. If the filter is water-
soaked, it must be thoroughly dried. Be sure to follow
solvent manufacturer's instructions.
4. Replace the filter. Never operate the saw without the fuel
filter!
CHAIN BRAKE MAINTENANCE
The clutch drum 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 CHAIN
BRAKE, it should be inspected daily for any signs of measur-
able wear or for any noticeable variation in the thickness of
the 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.
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 when the engine is running
at full throttle while cutting wood. 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.
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.
The sprocket should be checked frequently (every day with
extensive use of the saw) for evidence of wear or damage,
and replaced as necessary. The sprocket bearing should be
kept clean and well lubricated.
SPROCKET REPLACEMENT
1. Disconnect spark plug wire.
2. Remove spark plug using spark plug wrench.
3. Remove the CHAIN BRAKE, bar and chain, and the starter
cover.®
4. Remove the clutch nut by holding an 11/16 inch (17 mm)
socket wrench on the flywheel nut to act as a backup to an
11/16 inch wrench on the clutch nut.®®
5. Remove the clutch nut by turning clockwise (left hand
thread).®
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, sprocket and drum assembly, clutch
and the clutch nut. Ensure the sprocket is installed with
the smooth side against the clutch drum. Lock the
crankshaft as explained in Step 4, above, turning the nut
in a counterclockwise direction. Tighten the nut securely.
Torque specifications can be found in the back of this
manual.
8. Place the starter cover in position but do not force it
against the starter pawls. Be certain the guide post is
positioned in the locating hole in the fan housing. @
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