Tracking Adjustment; Pto Drive Pulley Alignment - Exmark NAVIGATOR Operator's Manual

Set neutral:
1. Remove the electrical connection from the seat
safety switch, located directly in front of the seat
switch assembly.
2. 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.
3. Start the engine.
4. Run the unit at least 5 minutes with the speed
control lever at full forward speed to bring
hydraulic system oil up to operating temperature.
Return speed control lever to neutral (full rear)
position.
5. 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.
6. Adjust the left pump linkage by rotating the
tracking adjustment knob.
7. Adjust the right pump linkage by using a wrench
to turn the double nuts on the assembly (see
Figure 34)
Figure 34
1. Rotate tracking knob on
left side
8. 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).
2. Rotate double nuts on
right side
9. Stop engine and wait for all moving parts to stop.
Remove jumper wire from wire harness connector
and plug connector into seat switch.
10. Lower from jackstands.

Tracking Adjustment

See Motion Control Linkage Adjustment section

PTO Drive Pulley Alignment

PTO drive pulley alignment is necessary for any of
the following conditions:
• The blower has been removed or replaced.
• The engine mounting bolts have been loosened or
the engine has been moved or replaced.
• The jackshaft mounting bolts have been loosened
or the jackshaft has been moved or replaced.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Move the speed control lever to the neutral
position.
3. Disengage the PTO lever.
4. Remove fuel tank mounting nuts and swing out
fuel tank.
5. Verify that the blower is installed and secured
tightly.
6. Loosen the four engine mounting bolts.
7. Unhook the pump belt tension spring.
8. Loosen the four jackshaft mounting bolts.
9. Measuring from the blower pulley as a baseline,
move the engine and jackshaft until the rear
surface of all three pulleys are aligned within 1/32
inch to 1/16 inch (0.8-1.6 mm). Use a straight
edge to align all three surfaces (see Figure 35).
45
Maintenance