Yard Machines MTD1425NAV Operator's Manual page 18

MAINTENANCE AND REPAIR INSTRUCTIONS
STORING A CHAIN SAW
CAUTION:
30 days without performing the following
procedures.
Storing a chain saw for longer than 30 days requires
storage maintenance. Unless the storage instructions are
followed, fuel remaining in the carburetor will evaporate,
leaving gum-like deposits. This could lead to difficult
starting and result in costly repairs.
1. Remove the fuel tank cap slowly to release any
pressure 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
combustion chamber. Pull starter rope slowly several
times to coat internal components. Replace spark
plug (Fig. 31).
NOTE: Store the unit in a dry place and away from
possible sources of ignition such as a furnace,
gas hot water heater, gas dryer, etc.
REMOVING A UNIT FROM STORAGE
1. Remove spark plug.
2. Pull starter rope briskly to clear excess oil from
combustion 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 Oil
and Fuel Information.
GUIDE BAR MAINTENANCE
Frequent lubrication of the guide bar (railed bar which
supports and carries the saw chain) sprocket tip is
required. Proper maintenance of the guide bar, as
explained in this section, is essential to keep your saw in
good working condition.
Never store a chain
saw for longer than
Fig. 31
Sprocket Tip Lubrication
CAUTION:
been pre-lubricated at the factory. Failure to
lubricate the guide bar sprocket tip as
explained below will result in poor
performance and seizure, voiding the
manufacturer's warranty.
Lubrication of the sprocket tip is
recommended after 10 hours of use or
once a week, which ever occurs first.
Always thoroughly clean guide bar sprocket
tip before lubrication.
The Lube Gun (optional) is recommended for applying
grease to the guide bar sprocket tip. The Lube Gun is
equipped with a needle nose tip which is necessary for
the efficient application of grease to the sprocket tip.
To lubricate the sprocket tip:
1. Move the STOP switch down.
NOTE: It is not necessary to remove the saw chain to
lubricate the guide bar sprocket tip. Lubrication
can be done on the job.
2. Clean the guide bar sprocket tip.
3. Using the Lube Gun (optional), insert tip of lube gun
into the lubrication hole and inject grease until it
appears at outside edge of sprocket tip (Fig. 32).
4. Rotate saw chain by hand. Repeat lubrication procedure
until the entire sprocket tip has been greased.
SAW CHAIN / BAR LUBRICATION
Adequate lubrication of the saw chain is essential at all
times to minimize friction with the guide bar.
Never starve the bar and chain of oil. Running the saw
with too little oil will decrease cutting efficiency, shorten
saw chain life, cause rapid dulling of chain, and cause
excessive wear of bar from overheating. Too little oil is
evidenced by smoke, bar discoloration or pitch build-up.
NOTE: Saw chain stretches during use, particularly when
it is new, and it will occasionally be necessary to
adjust and tighten it. New chain will require
adjustment after about 5 minutes of operation.
AUTOMATIC OILER
Your chain saw is equipped with an automatic gear driven
oiler system. The oiler automatically delivers the proper
amount of oil to the bar and chain. As the engine speed
increases, so does the oil flow to the bar pad. There is no
flow adjustment. The oil reservoir will run out at
approximately the same time as the fuel supply runs out.
18
The sprocket tip on
your new saw has
Fig. 32