Exmark Viking Hydro Operator's Manual page 34

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5.2.7
d) Belt must be tight enough so it does not slip during heavy loads while
cutting grass. Over-tensioning will reduce belt and spindle bearing life. To
adjust belt tension, loosen the 5/16" whizlock nut on turnbuckle and rotate
the turn buckle; rotate turnbuckle toward rear of mower to tighten, and
toward front of mower to loosen belt tension (See Figure 13).
For 48" & 52" Decks: If there is no adjustment left in the turnbuckle and
the belt is still loose, the rear idler pulley can be repositioned in the front
hole (See Figure 13). The belt guide located next to the pulley must also
be repositioned in the front hole when the pulley is moved. The turnbuckle
will need to be readjusted.
Check belt tension after the first hour of operation and at least twice during
the first 24 hours of operation. Adjust as necessary.
Note: After readjusting the belt tension check the belt guide adjustment
Section 5.2.8 and blade brake adjustment Section 5.2.7.
MOWER DECK BELT ADJUSTMENT
e) Proper belt tension will require about 10 lbs. (44.5 Nt.) side pull on the belt,
halfway between pulleys, to deflect belt 1/2" (1.3 cm). (See Figure 13, Point A).
Blade Brake Adjustment:
a) Stop engine and wait for all moving parts to stop. Remove key or spark
plug wire(s).
b) Disengage PTO.
c) Make sure the blade brake pad rests against the sheave. Adjust the spring
mounting bolts to properly align the pad on the sheave. See Figure 14.
d) Check the distance between the spacer and the nut at the end of the blade
brake rod. The distance should be between 1/8" (.32 cm) and 3/16" (.47
cm). See Figure 14.
e) Engage the PTO and check to make sure the blade brake pad clears the
sheave.
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FIGURE 13
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