Service Manual

9-9
WPM Drive Systems Manual
HANDLES&CONTROLCABLES
Lawn-BoySens-a-Speed
On blade clutch models, the engine on and off is
controlled by a switch on the left hand handle. The bail
engages and disengages the blade. The Sens-a-Speed
handle controls the self-propel the same way as on a
zone start model.
HandleDisassembly,ZoneStartModels
1. Loosen the cable clamp and disconnect the Sens-a-
Speed cable (Fig. 279).
The Lawn-Boy Sens-a-Speed handle is made in two
forms, zone start and blade clutch. The basic function is
the same but the addition of the blade clutch mechanism
makes the handle for those models a little more
complex.
Operation
The top mounted bail is the engine stop control on
zone start models and the blade control on blade clutch
models.
On a zone start model, pull the top bail down and
hold to keep the engine running. The Sens-a-Speed
handle telescopes and as it is depressed tensions the
transmission drive belt. To operate this keep your elbows
at your sides, hold your hands straight out in front of you
and walk. If you want to go faster, walk faster. Do not
push the Sens-a-Speed handle down. That will activate
the drive too aggressively and the mower will jump
forward.
Fig278 DSC-4864a
Fig279 DSC-4869a
A. Top bail
A
Fig280 DSC-4871a
2. Squeeze the ends of the upper bail to disengage
them from the handle. On some models the right
side of the bail may be connected to the pin by a
push nut. The push nut can be removed or the bail
removed with the pin attached (Fig. 280).