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FIGURE 5
3.2.2 Blower Drive Sheave Installation :
a) Remove the right side belt shield and the 5/16 x 3 1/4 bolt that secures the
shield to the deck.
b) Remove the deck drive belt from around the right sheave.
c) Support the right mower blade so that it will not fall off when the right sheave nut
is removed.
d) Remove the right sheave nut, spring disk washer, and drive sheave from the
spindle shaft.
NOTE: On units with wrench flats on the spindle just above the blade use
a 1-inch wrench on the flat sides of the spindle shaft to prevent the
spindle from turning. On units that do not have a wrench flat, block the
blade rotation with a block of wood between the blade and baffles as
indicated in the blade service section of the Lazer Z HP operator’s manual.
Do not use the blade bolt to prevent rotation.
e) Apply a light coat of Mobil HTS grease (or a food grade antisieze) to the top
portion of the spindle where the sheave mounts.
f) Install the double sheave (Item 21) onto the right spindle shaft. Install the spring
disk washer and nut removed in Step e). Make sure that the spring disk washer
cone is installed towards nut (See Figure 5). Torque the sheave nut to:
5/8 - 11 nut (15/16 Hex) - 75-80 ft. lbs.
3/4 -16 nut (1 ¼ Hex) – 140-145 ft. lbs.
NOTE: On units with wrench flats on the spindle just above the blade use
a 1-inch wrench on the flat sides of the spindle shaft to prevent the
spindle from turning. On units that do not have a wrench flat, block the
blade rotation with a block of wood between the blade and baffles as
indicated in the blade service section of the Lazer Z HP operator’s manual.
Do not use the blade bolt to prevent rotation. Check blade bolt torque
after completing this installation (115 – 120 ft. lbs.).
FIGURE 4