Exmark Lazer Z SX Diesel Models 4500-501 Rev A - Manual (Page 40)

Maintenance
Figure 17
1. Spring idler pulley 3. Right side idler pulley
(adjustable)
2. Front of unit
Deck Belt Tension
Self-tensioning - No adjustment necessary.
Alternator Belt Tension
Stop engine, wait for all moving parts to stop and
remove key. Engage parking brake.
Tilt seat and remove air deflector panel
To tighten alternator belt, loosen both upper and
lower alternator mounting bolts. Rotate alternator
out, away from engine and retighten hardware to
secure in place.
When properly tensioned, the alternator belt will
deflect 1/4 to 3/8 inch (7-9 mm) while applying 22
pounds of force to the belt midway between fan and
alternator.
Belt Guide Adjustment
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Remove the belt shield on the right side of mower
deck.
3. Note belt guide bolted to deck near the shield
support stud and right-hand pulley. Guide should
be 1/8 inch (3.2 mm) away from the belt, with
bolt-end of guide near end of slot (Figure 18).
4. If adjustment is necessary, loosen the bolt securing
the belt guide and make proper adjustment.
Tighten hardware.
Figure 18
1. End of slot 2. Belt guide
Brake Link Adjustment
Check to make sure brake is adjusted properly.
1. Disengage brake lever (lever down).
2. Measure the length of the spring. Measurement
should be 2 13/16 inches (7.1 cm) between
washers. (Figure 19).
3. If adjustment is necessary, adjust the nyloc nut
at the bottom of the spring to achieve 2 13/16
inches (7.1 cm).
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