Simplicity LTH Series Operator's Manual page 45

Adjustments
A. Belt Stop
B. PTO Pulley
C. Belt
Leveling the Mower
If the cut is uneven, the mower may need leveling. Unequal or
improper tire pressure may also cause an uneven cut. See
page 21.
^^WARNING
To prevent accidental starting, remove the ignition key
and then remove the spark plug wire and fasten it away
from the spark plug.
1. With the mower instailed, place the tractor on a smooth
level surface, such as a concrete floor. Turn the front
wheels straight forward.
2. Check for bent blades, and replace if necessary.
3. Disengage the PTO. Arrange the mower blades so that
they are both pointing from side-to-side, perpendicular
to the tractor. Engage the PTO.
4. Measure the distance between the outside tips of each
blade and the ground. If there is more than 1/8 inch (3
mm) difference between the measurements on each
side, proceed to step 5. If there is 1/8 inch (3 mm) or less
difference, proceed to step 6.
5. Remove the cotter pin (E, figure 39) which secures the
mower leveliing rod (D). Shorten the rod (D) to raise the
left side of the mower or lengthen the rod to lower the left
side of the mower. Put the levelling rod back in its hole
and recheck the measurements. If the mower is ievel,
install the cotter pin (E).