Cub Cadet 23HP Z-Force 60 - Manual (Page 24)

24
Performance Adjustments
A. High Speed Tracking Adjustment
If mower tracks to one side with both lap bars in fully for-
ward position:
1. Check air pressure in all four tires:
a. Pressure should be within specified ranges and
balanced side-to-side.
b. Rear tires 8-10 psi recommended (20 psi
MAX.)
c. Front tires 20-25 psi recommended (28 psi
MAX.
2. Verify that the mower does not creep when the
engine is running, the lap bars are in the neutral
position and the parking brake is released. (Refer
to section D-3 on page 19 of this manual if this
condition exists).
3. Recheck the tracking after any adjustments based
on the above.
4. If uneven tracking persists, adjust as follows. (see
Fig. 10)
a. Unit tracks to the RIGHT, adjust Left lap bar
stop bolt to make it longer.
b. Unit tracks to the LEFT, adjust Right lap bar
stop bolt to make it longer.
5. Re-check the tracking and make any fine tuning
adjustments to the lap bar stop bolts as required.
Note:
If stop bolt is adjusted too far, tracking
problem will change sides. Make the fine tuning
adjustments by shortening the same bolt.
B. Engine RPM Check and Adjustment
1. Verify that the lap bars are in the neutral position,
the parking brake is on, and the PTO drive is dis-
engaged.
2. Start the mower and let it run at approximately
half throttle for 3-5 minutes to bring the engine up
to operating temperature.
3. Locate the (optional) Hour Meter/Tachometer/
Service Minder display on the right hand operator
control panel if so equipped, or use a hand-held
tachometer. (see Fig.1 on page 9 of the manual)
This display defaults to the tachometer mode when
engine is running.
4. Move the throttle lever to the high speed position
and note the RPM reading on the display.
5. Move the throttle lever back to the low speed posi-
tion and again note the displayed RPM’s.
6. Compare these noted RPM readings to the specifi-
cations in Table 1, for the engine that is on your
mower.
7. If the readings do not correspond to the ranges in
the table, refer to the engine owner’s manual for
the proper adjustment procedures.
8. If adjustments per the engine operator’s manual do
not result in proper RPM readings, contact your
service technician.
9. Note: The throttle cable sheath may shrink or slip
over time, changing the relationship between the
throttle lever on the left hand operator control
panel and the throttle arm on the engine. To read-
just the throttle cable:
a. Make sure the engine is off, place lap bars in
the neutral position, set the parking brake, and
disconnect and ground both of the spark plug
wires.
b. Locate and loosen the cable clamp on the
engine throttle plate.
c. Place the operator’s throttle lever to the high
speed position and then slide the cable through
the clamp until the throttle arm is in the full
throttle position. (ref. engine owner’s manual)
d. Tighten the cable clamp.
e. Move the operator’s throttle lever between high
and low speed and verify that the engine throt-
tle arm also moves through it’s full range of
motion.
f. Repeat as required to obtain proper throttle
adjustment.
g. Verify proper throttle adjustment by checking
RPM readings as outlined above.
Lap Bar Stop Bolt
Figure. 10
Description High RPM Spec. Low RPM Spec.
20, 23 Kohler 3475 +/-75 1550 +/-100
23 Kawasaki 3475 +/-75 1550 +/-100
NOTE: RPM Specs. are for free running engines under no load.
Table 1