MacDon M155, Operator'S Manual

Page: 357 / 510

MAINTENANCE AND SERVICING
Replace the secondary air fi lter (A) every year or after every
third primary fi lter change (even if it appears clean).
If the secondary air fi lter is dirty, inspect the primary
fi lter and the fi lter canister to determine the reason for
contamination.
• Examine the fi lter canister for cracks and replace
if necessary.
• Ensure fi lter sealing surfaces are soft, fl exible, and
sealing properly. Hard seals may allow debris through
to the secondary
fi lter.
• Ensure canister retaining latches are secure.
IMPORTANT:
• Do
NOT
remove the secondary
fi lter element unless it
needs replacing.
• Do
NOT
attempt to clean the secondary element (A). It
is replace only.
Figure 5.65: Engine Air Cleaner
8. Clean the inside of the canister housing and end cap carefully. Dirt left in the air cleaner housing may be harmful
to your engine.
• Remove hardened dirt ridges wherever
fi lter gaskets contact the cleaner housing.
• Clean the gasket sealing surfaces of the housing. An improper gasket seal is one of the most common causes
of engine contamination.
• Wipe every surface clean with a clean, water-dampened cloth.
• Check the housing visually to make sure it is clean before putting in a new
fi lter element.
9. Check for uneven dirt patterns on old element. It is a valuable clue to potential dust leakage or gasket sealing
problems. A pattern on the element clean side is a sign that the old element was
NOT
fi rmly sealed or that a
dust leak exists.
• Press on the fresh gasket to see if it springs back.
• Check the gasket for correct sizing. On a radial seal element the gasket surface is the inside diameter of the
open end cap.
• Make sure the gasket is seating evenly. If the gasket is not forming a perfect seal, you will
NOT
have protection.
• Ensure the sealing surface in the housing is clean, and the fi lter element is the correct model number. It may
be too short for the housing.
• Identify and rectify the cause of any leaks before replacing the fi lter element.
10. If required, also change the secondary fi lter. Refer to
Removing and Installing Secondary Air Filter, page 344
.
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Revision A