Clutch Shoes And Flywheel; Disassembly; Inspection - Toro 51643 Service Manual

SECTION 5 CLUTCH SHOES AND FLYWHEEL
Clutch Shoes and Flywheel Operation
The TC3000,
TC4000
and TC5000 use 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 74.
Figure 74
Operation of the clutch is as follows:
1.
When the trimmer engine speed is less than 3900
200 rpm (3300
200
rpm on the TC5000) the
spring holds the two clutch shoes in, away from the
clutch drum.
2. As the engine speed reaches
3900
200 rpm
(3300
200 rpm on the TC5000) the centrifugal
force of the weights overcomes the spring and the
shoes make contact 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
a speed approximately 400 rpm less than the
engagement speed. The difference between
engagement and disengagement speeds occurs
because the shoes resist disengagement slightly
when they are in contact 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 Disassembly
1.
Remove the engine from the drive tube as
described under Engine Removal from Drive
Tube, page 40.
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.
IMPORTANT: (TCSOOO only). The
coil is
mounted to the inside of the fan housing on the
TC5000. To avoid damaging the coil ground
lead, pull up on the muffler side of the housing
only, and swing the fan housing out of the way
in a manner similar to that of opening a book.
Clutch Shoes and Flywheel Inspection
1.
Inspect the clutch p a d s for even wear. Also inspect
the clutch shoes for evidence of cracking.
2.
Inspect the clutch drum (found in the fan housing)
for roundness and even wear.
3.
Check the flywheel magnets using the screwdriver
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. See Figure 75.
Figure 75
34