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8-4

WPM Drive Systems Manual

BBC/BOS/BCS

These components interact to provide control to the BBC

deck mechanism. Notice in Figure 183 the position of

the traction cable lever and the BBC cable lever. This is

the “at rest” position; both the BBC and the transmission

are disengaged. When the control bar is in this position,

it is the buckling spring that supports it. Notice that the

buckling spring is not exed and is at the left end of the

slot in the rocker arm.

e. Traction Lever: provides input to the traction cable

since the end of the traction cable is retained in it.

It also pivots on the upper shoulder bolt when the

control bar is moved.

f. Rocker Arm: pivots on the upper carriage bolt. It is

afxed solidly to the control arm by means of the roll

pin. It houses both the control hook and cable lever.

It also provides slot and stop for the buckling spring.

g. BBC Cable Lever: controls tensioning and loosening

of the BBC cable since the end of the BBC cable

is retained by it. Pivots freely on the upper carriage

bolt. Movement is controlled by the control hook.

h. Control Hook and Spring: pivots on the roll pin and

is spring-loaded in the counterclockwise direction by

the torsion spring. The control hook “grabs” the cable

lever when the control bar is cocked and releases

the cable lever when the control bar is dropped.

i. Buckling Spring: sole purpose is to hold the control

bar in the middle position when at rest. The spring is

exed or “buckled” when the control bar is operated.

It rides in a slot on the rocker arm to prevent it from

applying force to the control bar when the control bar

is at its lowest or uppermost positions.

j. Right Control Housing: serves as the other half of

the control box cover. Houses the leaf spring.

k. Leaf Spring: releases the control hook as the

control bar drops to “at rest” position. Because of its

orientation, it allows the control hook to slip by as the

control bar is raised.

Fig183 3428-0278

A. Control hook C. Traction cable lever

B. BBC cable lever D. Buckling spring