Exmark Ultra Vac QDS Operator's Manual page 12

For Exmark Mower Parts Call 606-678-9623 or 606-561-4983
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: 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:
3/4 -16 nut (1 ¼ Hex) – 140-145 ft. lbs.
NOTE: 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.
TORQUE TO:
3/4-16 NUT (1 1/4 HEX) – 140-145 FT-LBS
Check blade bolt torque after completing this installation:
For units with a 5/8-18 x 2 3/4 blade bolt, torque to 115-120 ft-lbs (156-163 N-m)
For units with a 1/2-20 x 2 blade bolt, torque to 55-60 ft. lbs (75-81N-m)
g) Re-install the deck drive belt in the lower groove of the double sheave.
Install plug (Item 25) into bore of double sheave.
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FIGURE 4
FIGURE 5
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