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If the control bar
is raised so that
it
touches the handle,
it
will cause the traction lever to move slightly and
engage the transmission.
CUTAWAY ROCKER ARM)
Figure
78
Finally, when the control bar is released, the tip of the
control hook catches on the leaf spring causing
it
to
rotate.
This
releases the BBC cable lever, thereby
causing the BBC to clutch and brake the blade. See
Figure 79.
Figure
79
BBC Control Box Disassembly
NOTE: When servicing the BBC
control box, be careful
not to disassemble the unit any further than necessary
as
it
will then become difficult
to troubleshoot. Instead,
remove the right housing half, then operate the control
box while watching for proper function
of internal
components. See Step 5 below for more information.
1.
Place a piece of duct tape over the heads of the
carriage bolts passing through the handle and
the BBC control box. This will prevent them from
falling
out
later during troubleshooting.
2.
Bend the locking tab securing the throttle control
to the control panel then tap the throttle control
out using a rubber mallet.
3 .
Remove the
3
flanged head screws retaining the
2 control box halves.
4.
Carefully remove the
2
nylon locknuts retaining
the control box to the handle and remove the
right control box half. Be careful not to dislodge
any internal components.
5.
Operate the control bar in its normal manner to
determine if any of the components inside the
control box are malfunctioning.
CAUTION! Wear gloves and eye protection
when operating an open control box as the
buckling spring could fly out.
NOTE:
The cable ends and
end of the spring are
not retained once the right cover is removed. Be
sure to use one the two methods below to retain
them.
The first and quickest method
is to manually hold
the ends of the cable and the end
of the buckling
spring while operating the control bar. However,
with the right case half removed, the leaf spring
is no longer in place and you will not be able to
observe release of the BBC cable lever.
A better method is to make a special cut-away
version of the right control box housing half as
shown in Figure
80. When
this cut-away version
is installed, all components will function normally.
Notice the cutaway cover and how
it
houses the
leaf spring. This will aid in diagnosis.
Figure
80
6.
If further disassembly is required, remove the
buckling spring and washer from the rocker arm
assembly.
7.
Remove the BBC cable from the BBC cable lever
and the left-hand control box half.
Vacu-Power
wer
49
BBC System
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