Deck Belt Tension; Alternator Belt Tension; Belt Guide Adjustment - Exmark Laser Z XS Operator's Manual

side engine deck support, is positioned between
the centers of the two alignment holes in the
left support plate (Figure 16 and Figure 17). It
is necessary to adjust the belt tension when the
center of the bolt head is at or below the center
of the bottom alignment hole.
3. When adjustment is necessary, loosen the idler
pulley on the right-hand side so it can move up
and down in the slot.
Place a wrench on the 3/8 inch nut in the center
of the spring loaded pulley and apply upward
pressure to relieve tension on the spring (a 1/2
inch drive breaker bar and 9/16 inch socket works
best).
Reposition the adjusting pulley to the bottom of
the slot.
Note: When installing a new belt, it is necessary
to reposition the right adjusting pulley upward in
the slot in order to position the center of the spring
loaded pulley between the alignment holes.
Figure 16
1. Front of unit 2. Alignment holes
1. Spring idler pulley
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
39
Maintenance
Figure 17
3. Right side idler pulley
(adjustable)