MTD YARD-MAN 12A-979L401 Operator's Manual page 15

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Remove the center bolt which secures the blade to
the crankshaft followed by blade bell support,
blade, and blade adapter.
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 18.
Figure 18
Remove the hex bolt from the rear of unit holding
the transmission to the mower housing.
See Figure 19.
Figure 19
Tilt the transmission forward and loosen the idler
pulley bolt and lock nut half a turn. See Figure 20.
Using a pair of pliers, pull back and rotate belt
keeper bracket from the slot on the idler pulley.
Slide the belt out from between the belt keeper
bracket and the idler pulley.
Squeeze the belt together and push it forward,
while pressing the control arm inward towards the
deck and remove the six speed cable from the slot.
See Figure 20.
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. See Figure 20.
Baffle
Figure 20
15

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