Exmark Turf Tracer HP 4500-540 Rev. B - Manual (Page 36)

Maintenance
Tracking Adjustment
1. Stop engine and wait for all moving parts to stop.
2. Check the drive tire pressures and tire
circumferences as stated in Check the Tire
Pressures section in Maintenance.
3. Run the unit and observe the tracking on a level,
smooth, hard surface such as concrete or asphalt.
4. If the unit tracks to one side or the other, turn the
quick track knob. Turn the knob right to “steer”
right, turn the knob left to “steer” left.
Hydro Pump Spring Tension
Setting
1. For medium or heavy duty drive conditions such
as operation with a sulky on steep slopes, a higher
spring force may be required on the hydro pump
control arms to prevent the drive system from
stalling.
2. For a heavier drive setting, relocate the spring
anchor link as shown in Figure 13. The spring
anchor links are located under the engine deck on
the left and right hand sides.
Note: In “medium” or “heavy duty” positions,
the drive lever forces at the upper handle will also
be increased.
Figure 20
1. Heavy duty 3. Standard
2. Medium duty 4. Retaining bolt
PTO Safety Switch
Mounted to a tab on the inside left side of the fuel
tank support.
1. Stop engine and wait for all moving parts to stop.
Engage parking brake. Remove ignition key or
spark plug wire(s).
2. With PTO disengaged and the bellcrank touching
the rear of the slot in the engine deck, adjust the
PTO safety switch (if needed) until the bellcrank
arm is 5/16 inch (7.9 mm) from the switch body.
3. Be sure the bellcrank Does Not touch the switch
body or damage to the switch could occur.
4. Retighten PTO switch mounting hardware.
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