Servicing The Unit - MTD 31A-020-900 Operator's Manual

SERVICING THE UNIT
Extreme care and knowledge of the system is required
when servicing this unit. Service should be pedormed by
qualified service personnel only. Replacement parts for this
unit must be identical to the parts they replace, Refer any
repair to an authorized service dealer.
INSPECTING/REPLACING THE DRIVE BELT
When servicing the unit, use only original equipment man-
ufacturer replacement parts. Inspect the drive belt once a
year or every 50 hours of operation, whichever comes first,
for wear. If the drive belt needs to be replaced, use the foL-
lowing instructions.
I_
IAIADI_IIMt'_.- To avoid serious
I
vv_"Lm z,zl,,a',z_,,,q, personal injury,
turn off the unit and allow it to cool. Unplug
the unit before you perform any mainte-
nance.
1, Remove the 7 screws (A) from the belt case cover (B)
using a #T20 torx bit or flat blade screwdriver. (Fig. 7)
2, Remove the flange lock nut (C) and remove the 3
screws (D) from the belt case cover (E) using a #T20
Torx hit or flat blade screwdriver. (Fig, 8)
3. Pull the belt tensioner (F) away from the drive pulley
(G). Remove the damaged or broken belt (H) from the
driven pulley (I) and drive pulley inside of the housing.
Discard appropriately. (Fig. 9)
4. Loop the new belt around the drive pulley and driven
pulley (Fig. 8). Pull the belt tensioner (idler arm) away
from the drive pulley to install the belt around the drive
pulley.
NOTE; Make sure the washer is still in pface on the driven
pulley shaft prior to reinstalling the belt case cover.
5. Reinstall the flange lock nut. Torque the nut to 50-100
in° lb (90-11,2 N*m) and reinstall the 3 screws. Torque
all screws to 18-23 in, Ib (20-2.5 Nom).
6. Reinstall the cover with the 7 screws. To make instal-
lation easier, place the narrow part of the cover into
the recess of the housing. Install the top 2 screws,
then push the rest of the cover down into the recess
and over the rotor shaft. Toque all 7 screws to 18-23
in, Ib (20-2.5 N°m)
NOTE: If the flange Iock nut is damaged, do not replace it
with a standard nut. Replace only with an original equip-
ment manufacturer replacement part.
Fig. 7
Fig. 8
10
Fig. 9