Exmark Laser Z XP Operator's Manual page 41

1/2" height position. Place locking pliers between the rear swivel and
spring stop to hold the deck in this position. See Figure 9.
g) Place a 3/4" thick block of wood under each of the two (2) rear anti- scalp
roller brackets and place one under one of the front center anti-scalp
roller brackets.
h) Loosen the two (2) top chain bolts in slots in the rear deck lift arms. Loosen
jam nuts and back off the socket head adjusting screws on the bottom of the
arms until the chains are just loose. Turn the socket head adjusting screws
in until slack is taken out of each chain. Tighten the jam nuts. Tighten the
chain bolts in the deck lift arms making sure they don't move while
tightening.
i) Loosen the four (4) nuts which secure the front swivels (two per side) until
the front chains are loose and front of deck is supported by the 3/4" block.
Do not loosen the front chain hardware.
j) On left side, adjust front swivel using the locking nut behind the swivel until
the front chain is tight and all slack is removed from linkage. Do not lift front
of deck off 3/4" block. Secure front swivel using locking nut in front of
swivel. Repeat for right side.
k) Recheck that the 3/4" blocks fit just snugly under the brackets and that the
tension on all the chains are approximately equal. Make sure all chain
attachment bolts are tight. Reposition anti-scalp rollers and tighten securely.
l) Raise deck lift lever to the 5" cutting height position See Figure 7. Adjust
spring compression until proper distance is obtained between the two large
washers (See Figure 9). Adjustment is made by turning the nut at the front of
each spring (clockwise will shorten the spring, counter-clockwise will lengthen
the spring). Lock in position with jam nuts.
NOTE: When above adjustments have been made, the front of the
deck will be slightly lower than the rear of the deck.
5.2.3 Wheel Drive Pump Belt Tension.
Self-tensioning - No adjustment necessary.
5.2.4 Fan Pump Belt Tension.
Self-tensioning – No adjustment necessary.
5.2.5 Mule Drive Belts Tension Adjustment.
Self-tensioning idlers, adjust as follows:
a) Stop engine, wait for all moving parts to stop, and remove key.
b) Check to make sure the coils of the spring on the spring-loaded idler pulley
measures as listed below. See Figure 12.
FIGURE 9
SWIVEL ADJUSTMENT
SPRING COMPRESSION ADJUSTMENT
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Front of Unit