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Secure the brake assembly to the engine with
two self-tapping flanged head screws. Adjust the
brake tube so
it
is square with the flywheel and
so that there is approximately 2.4 to 3.2 mm
(3/32" to 1/8") clearance between the top of the
brake tube and the bottom of the flywheel.
6.
Once properly adjusted, tighten the
two
flanged
head screws. Remove the tape from the control
bar.
Brake Mounting Screw Torque:
11.8 N-m (105 in Ibs)
7.
Check again for proper adjustment of the zone
start brake switch with an ohmmeter
or
test light.
The switch should change from closed to open
at a point when the control bar is 10 cm (4') below
the handle. Adjust the upper end of the brake
cable if necessary.
8.
Slip the screen panel fastener through
the P
clamp and secure.
"P".
Clamp Fastener Torque:
25 N
m
(225
in Ibs)
9.
Install any engine components that
were
removed for brake servicing.
10. Check
to insure that the brake system functions
normally before returning to the customer.
Plunger Style Zone Start Brake Adjustment
See Zone Start Brake Adjusting Blade Brake, page
25.
PIVOTING ZONE START BRAKE SYSTEM
Pivoting Zone Start Brake System Operation
The pivoting style zone start brake system consists
of
two parts. The first system stops spark production
and
the other stops the engine and blade.
Spark is stopped by means of a switch. The switch is
closed when the control bar is in the 'at rest' position.
Raising the control bar opens
the switch.
The switch leads are connected
to the primary side of
the coil and to ground. When the switch is closed, the
electronic ignition module is bypassed so that
it
cannot
interrupt primary current flow. This prevents the coil
from producing the high voltage necessary for spark.
When the switch is open, the ignition coil produces
spark.
Vacu-Power
ower
61
Stopping of the engine and blade is accomplished by
means of a brake that is applied to the bottom of the
ignition flywheel. The brake is spring loaded in the
'braked' position when the control bar is in the 'at rest'
position. When the control bar is lifted, the brake is
pulled away from the flywheel to allow the engine to
run.
Pivoting Zone Start Brake System Disassembly
See Figure
106.
Figure 106
1.
Inspect the brake pad for excessive wear and
replace if necessary.
NOTE: The brake pad is not replaceable sep-
arately from the brake plate.
2.
Remove the self-tapping screw securing
the
cable clamp to the mounting plate. Remove the
cable clamp, the ground strap
stop and the
brake cable with spring.
3.
Remove the two screws securing the mounting
plate to the
engine and remove the brake
assembly.
4.
If removal of the ground strap is required, drill
out
the two rivets securing
it
to the mounting plate
and remove the strap and insulator.
Pivoting Zone Start Brake System Assembly
1.
If
the ground strap has been removed, fasten
it
to the mounting plate as shown
in Figure 107.
screw. Tighten to:
2.
Secure the mounting plate with one self-tapping
Mounting Plate Screw Torque:
10.4 N-m (90
in
Ibs)
3.
Fasten the brake plate to the mounting plate and
block with the shoulder
screw. Make sure that the
brake plate pivots freely once the screws are
tightened. Tighten to:
r
Brake Plate Pivot Screw
10.4 N-m (90
in
Ibs)
Zone Start Brakes
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