Exmark Viking Hydro Operator's Manual page 36

b) With PTO disengaged and assist arm against the front assist arm stop,
adjust the blade safety switch mounting bracket (if needed) until the
bellcrank depresses the plunger by 1/4" (.64 cm).
c) Be sure the bellcrank DOES NOT touch the switch body or damage to the
switch could occur.
d) Retighten switch mounting bracket.
5.2.5 Engine to Mower Deck Belt Adjustment:
a) Stop engine and wait for all moving parts to stop. Remove key or spark
plug wire(s).
b) Engage PTO.
c) Check belt guides under rear engine and front mower deck to see that
they are properly set (See Section 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 14).
For 48" 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 14). 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 5.2.7 and blade brake adjustment Section 5.2.6.
MOWER DECK BELT ADJUSTMENT
e) Proper belt tension will require about 10 lbs. (44.5 Nt.) side pull on belt,
halfway between pulleys, to deflect belt 1/2" (1.3 cm). (See Figure 14,
Point A).
5.2.6 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 15.
.
31" (7.9mm)
Min.
FIGURE 14
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