Exmark NAV20KC - Manual (Page 37)

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Set neutral:
a) Remove the electrical connection from the seat safety switch, located directly
in front of the seat switch assembly.
b) The neutral adjustment must be made with the drive wheels turning. Raise the
frame and place on jack stands so that drive wheels can rotate freely.
Temporarily install a jumper wire across the terminals in the connector of the
wiring harness.
c) Start the engine.
d) Run the unit at least 5 minutes with the drive levers at full forward speed to
bring hydraulic system oil up to operating temperature.
e) To obtain the neutral position, adjust the left and right pump control rod
linkages that connect the steering control to the pump control arms until the
wheels stop, or creep slightly in reverse.
f) Adjust the left pump linkage by rotating the tracking adjustment knob.
g) Adjust the right pump linkage by using a wrench to turn the double nuts on
the assembly. See Figure 13.
FIGURE 13
h) Move the steering levers to the reverse position. While applying slight
pressure to the levers, allow the steering levers to return to neutral. The
wheels must stop turning (or slightly creep in reverse).
i) Stop engine and wait for all moving parts to stop. Remove jumper wire from
wire harness connector and plug connector into seat switch.
j) Lower from jackstands.
Set forward stop bolt:
a) Remove seat deck (with seat attached) to obtain a clear view of the steering
control shaft to complete this adjustment.
b) Push the speed control lever forward to full forward speed position.
c) If either steering control lever surface does not contact the stop bar at the full
forward speed position, adjust the stop bolt until contact occurs. See Figure 14.
Once contact occurs, turn the stop bolt one more full turn to prevent bottoming
of the hydraulic pump internal stops.
FIGURE 14