Troy-Bilt S979 Operator's Manual page 15

21" smart touchstarter mower
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Move the cutting height adjustment to the highest
position.
Remove the three hex screws holding the baffle to
the deck and pivot baffle towards the rear of the
mower. See Figure 16.
i-
\
Baffle
Slide the belt out from between the belt keeper
bracket and the idler pulley.See Figure 18.
Squeeze the belt together and push it forward,
while pressing the control arm inward towards the
deck and remove the three speed cable from the
slot.See Figure 19.
Three-Speed
Cable Slot
Belt
Control
Arm
"_
Figure 16
Remove the hex bolt from the rear of unit holding
the transmission to the mower housing.
See Figure 17.
Whee_
;I H- .°,,
Cutting Height
_/
Adjustmen_
Wheel
Figure 17
Tilt the transmission forward and loosen the idler
pulley bolt and lock nut half a turn. See Figure 18.
Figure 19
Pivot the control arm down away from the pulley
and belt.
Lift off the lower pulley assembly and remove the
old belt from around the crankshaft.
Place the new belt over the transmission pulley.
Start the belt in the pulley groove and rotate the
pulley until the belt is seated in the transmission
pulley.
Place the belt between the idler pulley and the belt
keeper bracket.
Using pliers, rotate the belt keeper bracket so that it
snaps into slot on the idler bracket.
Tighten the idler pulley bolt and lock nut half a turn.
Place the belt between the two pulley halves on the
crankshaft. Make sure to route the belt inside the
belt guard pin. See Figure 20.
Tr/ley_["
_/
_q_° n _
Upper Pulley
O O
BeltBeel_
per_=_-_
© ___Tra
Half
_
Brac.et
Tab
IBd_ae¢
kPe_lle _
nsmission
Belt
_
_-_,-_----------_
- Half
Bolt and /
Guard PinF
__I_;P"
Locknut
Figure 20
Figure 18
Using a pair of pliers, pull back and rotate belt
IMPORTANT: When replacing the belt, do not disas-
semble the lower pulley assembly.
keeper bracket from the slot on the idler pulley.
15

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