Honda H5518H Owner's Manual page 23

8. Front P.T.O. clutch lever
The lever is used to engage or disengage the front P.T.O. (Power Take Off)
shaft.
Lever in "ON" position-P.T.O. shaft rotates
Lever in "OFF" position-P.T.O. shaft stops
FRONT P.T.O. LEVER
When engaging the front P.T.O., always use a quick, smooth motion to
prevent premature wear.
NOTE: An interlock switch prevents the engine from starting unless the
P.T.O. clutch lever is in the OFF position.
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