18
Adjusting Traction Drive
If speed selector shifts properly but snowthrower does not
drive in reverse or forward speeds, an adjustment may be
required.
1. Check adjustment per steps 5 and 6 of Install Traction
Rod, page 8. Make adjustments if required.
2. If linkage is adjusted correctly and problem persists,
contact your local Authorized Lawn-Boy Service
Dealer.
Adjusting Speed Selector
If there is slow or no ground speed in No.1 speed
selection, or speed selector cannot be moved into No. 3
speed selection, an adjustment of the speed selector
linkage is required.
1. Pull wire off spark plug and make sure wire does not
contact plug accidentally.
2. Remove (4) screws securing bottom cover to frame.
Remove cover (Fig. 20).
3. Loosen flange nuts securing selector plate to control
panel. This allows selector plate to move freely for
adjustment (Fig. 27).
4. Shift speed selector to third gear and push down on
speed selector plate to move drive assembly to the
right. Drive assembly should be
!
/
8
” from roll pin; if
not, slide selector plate (Fig. 27) until
!
/
8
” dimension
is correct (Fig. 28).
659
Figure 27
1.
Flange nuts
2.
Speed selector plate
!
8
650/913
Figure 28
1.
Roll pin
2.
Drive assembly
5. With drive assembly
!
/
8
” from contacting roll pin,
tighten flange nuts securing speed selector plate.
6. Shift speed selector to R (REVERSE) and back to
third to check adjustment. If space between roll pin
and drive assembly is more than
#
/
16
of an inch (4.8
mm), repeat steps 2–4.
7. Reassemble bottom cover with (4) screws.
Replacing Spark Plug
Check spark plug yearly or every 100 operating hours. If
electrodes in center of plug are dark or have deteriorated,
install a new plug. Use a Champion RJ–19LM spark plug
or equivalent. Set air gap at 0.030” (0.76 mm).
1. Clean area around spark plug so foreign matter cannot
fall into cylinder when plug is removed.
2. Pull wire off spark plug (Fig. 29) and remove plug
from cylinder head.