McCulloch TM502 - Manual (Page 16)

7-2.AIR FILTER
CAUTION
Never operate saw without the air filter. Dust and dirt will be
drawn into engine and damage it. Keep the air filter clean!
TO CLEAN AIR FILTER:
1. Remove the top cover (A) and lift out air filter (B)
(Figure 7-2A).
2. Clean air filter. Wash filter in clean, warm, soapy water.
Rinse in clear, cool water. Air dry completely.
NOTE: It is advisable to have a supply of spare filters.
3. Install air filter. Install top cover. Make sure cover fits
properly. Tighten the cover retaining screws securely.
WARNING
Never perform maintenance when the engine is hot, to
avoid any chance of burning hands or fingers.
7-3.FUEL FILTER
CAUTION
Never operate your saw without a fuel filter. The fuel filter
should be replaced after each 20 hours of use. Drain fuel
tank completely before changing filter.
1. Remove air box cover and air filter as shown in Section
7-2.
2. Disconnect fuel hose (A) from carburetor fitting
3. Pull fuel filter (C) out of tank with a bent wire (D) or long
needle nosed pliers. Disconnect filter and discard.
NOTE: Do not pull hose completely out of tank.
4. Install a new fuel filter on hose and pull hose/filter
assembly back into tank so filter is positioned in front
right corner.
5. Reconnect fuel hose (A) to carburetor fitting (B).
Replace air filter and air box cover (Figure 7-3A).
6. Fill tank with fresh fuel / oil mixture. Install fuel cap.
7-4.OIL FILTER
NOTE: Drain oil tank before changing filter
1. Disconnect oil hose (A) from pump fitting (B).
2. Use a wire with a hook (C) and pull oil filter (D) from
tank. Remove filter and hose completely.
3. Insert a length of hose into tank and pull it through filler
opening
4. Install a new filter on hose and pull hose back into tank
so filter is positioned in bottom of tank.
5. Cut hose to fit and push it on to oil pump fitting (Figure
7-4A).
7-5.SPARK ARRESTER SCREEN (Figure 7-5A)
NOTE: A clogged spark arrester screen will dramatically
reduce engine performance.
1. Remove 2 muffler retaining nuts (E), Lock plate (F) and
muffler cover(G).
2. Remove spark arrester screen (H) from the metal baf-
fle (J). Replace screen with new one.
3. Reassemble the muffler components and tighten nuts
securely.
16 17
7 - MAINTENANCE INSTRUCTIONS
7-6.SPARK PLUG
NOTE: For efficient operation of saw engine, spark plug
must be kept clean and properly gapped.
1. Push STOP switch up.
2. Remove top Cover. Disconnect the wire connector from
the spark plug by pulling and twisting at the same time
(Figure 7-6A).
3. Remove spark plug with spark plug socket wrench. DO
NOT USE ANY OTHER TOOL.
4. Check electtrode gaps with wire feeler gauge and set
gaps to .025” (.635mm) if necessary.
5. Reinstall a new spark plug.
NOTE: A resistor spark plug must be used for replacement
(McCulloch part no. 9295-320001 champion RDJ8J or
equivalent).
NOTE: This spark ignition system meets all requirements
of the Canadian Interferen-Causing Equipment
Regulations.
7-7.CARBURETOR ADJUSTMENT
The carburetor was pre-set at the factory for optimum per-
formance. If further adjustments are necessary, please take
your unit to the nearest Authorized Service Center.
7-8.STORING A CHAIN SAW
Storing a chain saw for longer than 30 days requires stor-
age maintenance. Unless the storage instructions are fol-
lowed, fuel remaining in the carburetor will evaporate, leav-
ing gum-like deposits. This could lead to difficult starting
and result in costly repairs.
CAUTION
Never store a chain saw for longer than 30 days without
performing the following procedures.
1. Remove the fuel tank cap slowly to release any pres-
sure in tank. Carefully drain the fuel tank.
2. Start the engine and let it run until the unit stops to
remove fuel from carburetor.
3. Allow the engine to cool (approx. 5 minutes).
4. Using a spark plug wrench, remove the spark plug.
5. Pour 1 teaspoon of clean 2-cycle oil into the combus-
tion chamber. Pull starter rope slowly several times to
coat internal components. Replace spark plug (Figure
7-8A).
NOTE: Store the unit in a dry place and away from possi-
ble sources of ignition such as a furnace, gas hot water
heater, gas dryer, etc.
7-9.REMOVING A UNIT FROM STORAGE
Before starting, empty oil from combustion chamber.
1. Remove spark plug.
2. Pull starter rope briskly to clear excess oil from com-
bustion chamber.
3. Clean and gap spark plug or install a new spark plug
with proper gap.
4. Prepare unit for operation.
5. Fill fuel tank with proper fuel / oil mixture. See Fuel and
Lubrication Section.
7 - MAINTENANCE INSTRUCTIONS
7-2A
B
A
7-3A
B
A
C
D
7-5A
7-4A
D
C
A B
H
G
F
E
J
7-6A
7-8A