Exmark Ultra VAC QDS LAZER Z Operator's Manual page 17

Check blade bolt torque after completing this installation:
For units with a 5/8-18x2 3/4 blade bolt, torque to 115-120 ft-lbs (156-163 N-m)
For units with a 1/2-20x2 blade bolt, torque to 55-60 ft-lbs (75-81N-m)
3.3.7 Re-install the deck drive belt in the lower groove of the double sheave.
Install the plug (Item 24) into the bore of the double sheave.
3.3.8 Remove the discharge chute from the deck. Discard the mounting hardware, but
save the discharge chute for use during side discharge operation. The chute pivot
pin (Item 21) and hairpin (Item 22) may be stored in the pivot holes on the discharge
chute during bagging operation.
3.3.9 Install the belt cover mounting stud (Item 27) included in the Ultra Vac QDS
completing kit.
For 60 inch units only, install the spacer (Item 29), two 7/16 spring disk
washers (Item 30) and the plastic knob as shown in Figure 6. The knob
does not need to be tightened against the washers at this time.
3.3.10 Install the mounting pin weldment (Item 18) to the blower assembly using the 3/8-
16 x .75 screws (Item 28) and whizlock nuts (Item 24). Maximum deck clearance
will be provided if the bolts are installed from below the mounting pin. The mount
pin can be installed in two positions. For 60 inch decks the pin should be installed
as far away from the bumper end as possible. For 72 inch decks the pin should
be installed close to the bumper end. See Figure 7.
FIGURE 5
FIGURE 6
FIGURE 7
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