Kubota L3301 Operator's Manual page 59

A When releasing the cruise mode, be sure to return the
cruise control lever fully backward.
(1) Cruise control lever (A) "INCREASE"
(B) "DECREASE"
(C) "NEUTRAL"
A When you stand up from the seat with the speed
control pedal stepped on or the cruise control lever
engaged (ON), the engine will stop regardless of
whether the tractor is moving or not. This is because
the tractor is equipped with Operator Presence Control
system (OPC).
OPERATING THE TRACTOR 39