Toro 51643 - Maintenance; Maintenance - Air Cleaner; Maintenance - Muffler

Maintenance Air Cleaner
Servicing of the air cleaner is recommended after every
25 hours of operation or more often in very dusty
conditions.
See Figure 1.
1.
2.
3.
4.
5.
6.
7.
AIR
FILTER GRID
FOAM FILTER
FILTER SCREEN
Figure 1
Maintenance Muffler
Decarbonizing the muffler is recommended after every
50 hours of operation or if engine speed decreases
drastically. See Figure
2.
Remove the two screws securing the air cleaner
cover to the trimmer
Carefully remove the filter grid, foam filter and filter
screen.
Wash the foam filter in a soap and water solution
and dry thoroughly.
If the filter shows any sign of
damage replace
it.
Saturate the foam filter with 5ml (one teaspoon) of
SAE 30 oil, then squeeze to distribute the oil evenly
and to remove excess oil. The element should be
damp but not wet.
Wash the filter screen in a clean solvent and air dry.
If the filter screen shows any signs of damage,
replace
it.
Reinstall the air cleaner components as shown in
Figure
1. Note that the flat side of the filter grid
faces the foam filter.
Tighten the air cleaner screws to
0.15 to 0.20 kg m
(13 to 17.5 in Ibs)
Figure
2
1. Remove the three screws securing the muffler
cover to the trimmer.
2. Remove the two nuts securing the muffler to the
engine.
3. Rotate the engine crankshaft until the piston totally
covers the exhaust port. Clean the exhaust port
area by using a clean flat piece of hard wood.
Remove all loose particles.
IMPORTANT Use extreme care when cleaning
the exhaust port. Stay clear
of the piston so it
will not be damaged.
4. Inspect the inside of the muffler for excessive
carbon buildup.
If carbon buildup appears to be
restricting the exhaust flow, replace the muffler.
Otherwise, clean the muffler by holding
it with a
vice grips and heating with a propane torch. Once
hot, break the carbon loose by hitting the muffler
on
a hard surface. Ensure that the muffler is
completely free
of all carbon particles before
reinstalling.
5. Reinstall muffler using a new muffler gasket and
tighten all fasteners securely.
6. Reinstall the muffler cover as shown in Figure 1.
8