Exmark Vikingtm Hydro 4500-355 - Manual (Page 31)

Maintenance
3. Be sure the bellcrank Does Not touch the switch
body or damage to the switch could occur.
4. Retighten switch mounting bracket.
Engine to Mower Deck Belt
Adjustment
1. Stop engine and wait for all moving parts to stop.
Engage parking brake. Remove key or spark plug
wire(s).
2. Engage PTO.
3. Check belt guides under rear engine and front
mower deck to see that they are properly set (see
Belt Guide Adjustment section for instructions).
4. 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 inch 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 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 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 as stated in the
Belt Guide Adjustment and Blade Brake
Adjustment sections.
Figure 13
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 13, item 10–Point A) to deflect belt 1/2
inch (1.3 cm).
Mower Deck Belt Routings:
Figure 14
36 inch Mower Deck
31