Exmark Viking Hydro 920000 - Manual (Page 32)

Maintenance
mower to tighten, and toward front of mower to
loosen belt tension (see Figure 15).
For 48 inch 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 15). 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 as stated in the
Belt Guide Adjustment and Blade Brake
Adjustment sections.
Figure 15
48 inch Deck Shown for Reference Only
1. Pulley location for Viking Hydro
2. Belt guide must be moved to the front position if the
pulley is moved (48 inch deck only)
3. Pulley can be moved to the front position to tighten the
belt when there is no adjustment left in the turnbuckle
(48 inch deck only)
4. Turnbuckle
5. 5/16 inch (.79 cm) minimum engagement
6. 5/16 inch whizlock nut
7. Rear Assist Arm Stop
8. Assist Arm
9. Front Assist Arm Stop
10. Point “A”
5. Proper belt tension will require about 10 lb (4.5
kg) side pull on belt, halfway between pulleys (see
Figure 15, item 10–Point A) to deflect belt 1/2
inch (1.3 cm).
Mower Deck Belt Routings:
Figure 16
36 inch Mower Deck
Figure 17
48 inch Mower Deck
Blade Brake Adjustment
1. Stop engine and wait for all moving parts to stop.
Engage parking brake. Remove key or spark plug
wire(s).
2. Disengage PTO.
3. 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 18).
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