Clutch Shoes and Flywheel
-
Operation
The TClOOO uses a centrifugal type clutch. The
clutch is constructed of two shoes and a spring.
These parts are fastened to the flywheel as
shown in Figure 71.
Figure 71
Operation of the clutch is as follows:
1. When the trimmer engine speed is less than
3900
rpm the spring holds the two
clutch shoes in, away from the clutch drum.
2.
As
the engine speed reaches
3900
rpm
the centrifugal force of the shoes over-
comes the spring and the shoes make con-
tact with the clutch drum. This contact forces
the drum to rotate with the engine
so
that
power is transmitted to the trimmer head.
3. Under deceleration, disengagement takes
place at 3500 rpm The difference
between engagement and disengagement
speeds occurs because the shoes resist dis-
engagement slightly when they are in con-
tact with the clutch drum.
NOTE:
Operating the trimmer for long periods of
time near the engagement speed may cause the
clutch to slip and overheat. This can result in
peeling of the clutch shoes.
Clutch Shoes and Flywheel
-
Inspection
1. Remove the engine from the drive tube as
described under
Engine
-
Removal from
Drive Tube,
page 34.
2. With the recoil assembly on a hard flat
surface, use an impact wrench to remove the
four housing screws.
3.
Remove the fan housing.
4. Inspect the clutch pads for even wear.
Also
inspect the clutch shoes for evidence of
cracking.
5.
Inspect the clutch drum (found in the fan
housing) for roundness and even wear.
6.
Check the flywheel magnets using the screw-
driver method. Hold the handle end of a flat
bladed screwdriver between your thumb and
forefinger. Bring the tip of the screwdriver to
within
3/4"
to 1" of the magnet to be tested.
The screwdriver should be drawn to the
flywheel. If not, the flywheel should be
replaced.. Repeat this step for each magnet
on the flywheel.
7. Check the flywheel for cracks or broke fins.
Clutch Shoes and Flywheel
-
Removal
Make note of the markings on the top of the
clutch shoes to ensure proper installation
later.
For convenience, remove the two fasteners
securing the coil to the block and move the
coil to the side.
Using a strap wrench to hold the flywheel,
remove the two bolts retaining the clutch
shoes. The shoes, complete with the spring,
can then be removed as an assembly.
IMPORTANT: The flywheel
is
of cast alumi-
num design. Methods of holding the flywheel
other than with a strap-wrench may damage
the flywheel.
Remove the flywheel nut by turning it
counterclockwise using a strap-wrench to
hold the flywheel.
Remove the flywheel using Toro flywheel
puller part number 41-7650. See Fig. 72.
TORO
FLYWHEEL
PULLER
PART
NUMBER
41-7650
Figure 72
IMPORTANT: Use of a knockoff tool may
dimple the balls in the crankshaft ball bear-
ing. This could lead to early failure of the
bearing.
Replace any damaged or worn parts.
30
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