Honda H5518H Owner's Manual page 20

2. Accelerator pedal (A4 type only)
The accelerator pedal should be used with the throttle lever set in SLOW
(idle) position. Depress the pedal to increase the engine speed. Releasin-g
the foot from the pedal causes the engine speed to decrease. Use this
pedal when propelling on roads or transporting your tractor from one place
to another.
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The minimum speed of the engine is determined by the position
of the throttle lever. When the throttle lever is set in FAST position, the
engine speed is not lowered to the idle speed when the pedal is released
and can cause accident or injury.
ACCELERATOR PEDAL
3. Choke knob
Operate the choke knob to start the engine when the engine is cold.
KNOB