Exmark Laser Z XS Operator's Manual page 43

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4.2.14 Caster pivot bearings pre-load adjustment.
NOTE: The nut to the front of the unit on the RH rod has left-hand threads.
MOTION CONTROL ADJUSTMENT
f) Start engine. Brake must be engaged and motion control levers out to
start engine. Operator does not have to be in the seat. Run engine at
full throttle and release brake.
g) The reverse indicator spring must be correct before the following
adjustments can be made. See Section 4.2.12.
NOTE: The motion control lever needs to be in neutral while making
any necessary adjustments.
The left rod assembly controls the left wheel and the right rod assembly
controls the right wheel.
h) Bring the RH motion control lever into the neutral position. Adjust RH
pump control rod length by rotating the double nuts on the rod in the
appropriate direction until the wheels slightly creep in reverse. (See Figure
13) Move the motion control lever to the reverse position and while
applying slight pressure to the lever allow the reverse indicator spring to
bring the levers back to neutral. The wheel must stop turning or slightly
creep in reverse.
i) When adjustment is complete, re-tighten lock nuts onto ball joints at Rear
of the RH pump control linkage (See Figure 13).
j) Bring the LH motion control lever into the neutral position. Adjust the LH pump
control rod length by rotating the tracking adjustment knob in the appropriate
direction until the wheels slightly creep in reverse. Move the motion control
lever to the reverse position and while applying slight pressure to the lever
allow the reverse indicator spring to bring the levers back to neutral. The
wheel must stop turning or slightly creep in reverse (See Figure 13).
k) Shut off unit. Remove jumper wire from wire harness connector and plug
connector into seat switch.
a) Remove dust cap from caster and tighten
nyloc nut until washers are flat and back
off 1/4 of a turn to properly set the pre-load
on the bearings. If disassembled, make
sure the spring washers are reinstalled as
shown in Figure 14.
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FIGURE 13
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FIGURE 14
CASTER ADJUSTMENT