Husqvarna TC 450 Workshop Manual page 54

SETTINGS AND ADJUSTMENTS
AIR FILTER AND CLEANING
Wash filter with a specific detergent ("CASTROL FOAM AIR FILTER CLEANER"
or similar) then dry it fully (wash filter with gasoline only in case of necessity).
Plunge filter in special oil for filters ("CASTROL FOAM AIR FILTER OIL" or
similar), then wring it to drain superfluous oil.
: Do not use gasoline or a low flash-point solvent to clean the element. A
fire or explosion could result.
: Clean the element in a well ventilated area, and do not allow sparks or
flames anywhere near the working area.
ASSEMBLY
To ensure tight fit, slightly (C) grease filter edge on side facing filter housing.
While re-inserting the filter into its housing, make surs that piece (A) is turned
upwards and edge (B) is on the left lower side of the filter case. Reassemble the
parts previously removed (battery: connect the positive cable first).
: If the element assembly is not installed correctly, dirt and dust may enter
and the engine resulting in rapid wear of the piston rings and cylinder.
D.20 Part. N. 8000 H1344 (10-2009)