Service Manual

9-15
WPM Drive Systems Manual
HANDLES&CONTROLCABLES
2. With the engine off and the spark plug wire discon-
nected, cock and lift the control bar to engage the
blade. Tape the control bar to the handle with the
blade engaged, then measure the length of the over-
travel spring (Fig. 296). When adjusted properly, it
should measure 1” (25mm). If it does, skip ahead
to step 5. Otherwise proceed with adjustment in the
following step.
5. Install the screen panel with the two anged head
self-tapping screws. Make sure that the top edge
of the screen panel is under the lip at the top of
the housing. The screen is installed, sharp edge
down, to allow air to be drawn in through the screen
panel on top of the deck and down underneath the
deck. This venting improves the airow underneath
the deck thereby improving quality of cut and
bagging performance. Be sure to clean the screen
on occasion, especially if quality of cut or bagging
performance has degraded.
Note: AnoverlytightcablewillcausetheBBCto
disengagebeforethebailcanberaisedto
thenormaloperatingposition.Cockthebail
downwardandraisetothehandle.IftheBBC
disengagesandyouhearthebrakeengage
withasnap,thecableislikelytootight.
Excessivecabletensioncausesthecontrol
hookinthecontrolboxtorelease.Itdoesn’t
doanypermanentdamagetoanyparts.
Loosenthecableslightlyandrepeatthetest.
On BBC models, the control bail also controls the
transmission belt engagement. The adjustment point
is a knob about halfway between the control panel and
transmission. Ideally, the cable should be set so that
the transmission drive will disengage when the bail is
lowered about 1” (25mm). This allows the bail to be
lowered so that the wheels stop driving and the BBC
remains engaged, but the gap isn’t so large that the
handle is hard to hold (Fig. 297). This measurement is
not an exact requirement. It can be varied to accommo-
date a customer with small hands, etc.
3. There is a turnbuckle in the cable about halfway
between the control panel and the chassis. Adjust
the turnbuckle until the over-travel spring measures
1” (25mm).
4. Remove the tape from the handle and disengage the
blade.
Fig296 g. 68
A. Plastic tting C. Spring
B. Cable tting
1”
Fig297 g 20
1”(25mm)