Here are the instructions from my manual, since you have a Landpride mower I would assume the same will be in your manual.
Clutch Run-In
The clutch must be capable of slippage during operation
to protect gearbox, driveline, and other drive train parts.
Friction clutches should be “run-in” prior to initial
operation and after long periods of inactivity. To prevent
driveline and gearbox damage, repeat clutch “run-In” at
the beginning of each season and when moisture and/or
condensation seizes the inner friction plates.
Refer to Figure 5-1:
1. Using a pencil or other marker scribe a line across the
exposed edges of the clutch plates and friction disks.
2. Carefully loosen each of the 8 spring retainer nuts by
exactly 2 revolutions. It will be necessary to hold the
hex end of the retainer bolt in order to count the exact
number of revolutions.
3. Start the tractor and engage the driveline drive for
2-3 seconds to permit slippage of the clutch
surfaces. Disengage the driveline, then re-engage a
second time for 2-3 seconds. Disengage driveline,
shut off tractor, and remove key. Wait for all
components to stop before dismounting from tractor.
4. Inspect the clutch and ensure that the scribed
markings made on the clutch plates have changed
position. Slippage has not occurred if any two marks
on the friction disk and plate are still aligned. A clutch
that has not slipped must be disassembled to
separate the friction disk plates. See “Clutch
Disassembly” to disassemble clutch.
5. Tighten each of the 8 spring retainer nuts on the
clutch housing exactly 2 revolutions to restore the
clutch to the original setting pressure.