Exmark Lazer ZXS Operator's Manual page 24

Again, run the engine at one-third throttle, move the transmission shifter lever to
neutral, engage the PTO and release the OPC levers - the engine MUST stop.
If the mower engine does not stop under any of the above mentioned
conditions, DO NOT OPERATE. Contact your authorized Exmark service
dealer.
IMPORTANT: It is essential that all Operator Safety Mechanisms, be in
place and in proper operating condition prior to mowing.
4.1.5 Check Brake and Wheel Drive Linkage Adjustment.
Service Interval: Daily
a) Check for correct brake adjustment:
Place the drive levers in the "park brake" position. The mower should not
move forward or backward. If it does, tighten the wingnuts.
Place the drive levers in the "neutral lock" position. The mower should
move forward and backward freely. If it does not, brake adjustment is
necessary.
b) Adjust brakes by adjusting wingnut on the upper end of each brake rod.
Tighten the wingnut until the brakes engage when the drive levers are
squeezed enough to allow the neutral lock/park brake latches to be placed
into the "park brake" position.
See Figure 3 for Standard Pistol Grip handles and Figure 4 for ECS handles.
NOTE: The neutral lock/park brake latches must be able to be moved
into the park brake position, if not, the brake linkages must be adjusted
again.
c) Check for correct wheel drive linkage adjustment:
For Pistol Grip Handles:
Allow drive levers to drop into the full forward position: The clevis pin should rest
in the neutral lock latch with approximately 3/16" to 1/4" (4.7 – 6.4 mm clearance
from the bottom of the slot (See Figure 6). Adjust if necessary.
To adjust the wheel drive linkage:
d) For wheel drive linkage adjustment, remove the hairpin between the neutral
lock latch and drive lever (See Figure 6).
Drive
Lever
Hairpin
e) Adjust drive linkage length by threading into or out of the swivel until there is
a 3/16" to 1/4" (.47-.64 cm) clearance between the linkage assembly and the
bottom of the slot in the neutral lock/park brake latch (See Figure 7).
Clevis Pin
FIGURE 6
PISTOL GRIP HANDLES
DRIVE LEVER HARDWARE LOCATION
- 19 -
Drive Linkage
Left Side
Shown
Neutral Lock /
Park Brake Latch