The hand throttle is designed for off-road use only and is not intended to be used as a 'cruise control' device., Universal design Throttle Motor 247-5207 For Caterpillar Excavator CAT 312C TeraFlex Throttle Control TeraFlex 4870402 Throttle Hand Control Kit Constant Idle Control TeraFlex hand throttle kits are designed to control the throttle position at idle while taking on off-road terrain. They are especially effective when the clutch, gas, and brake pedals need to be used together It is especially useful when use of clutch, gas and brake are needed together. TeraFlex® - Control Arm Bracket The TeraFlex hand throttle kit is designed to provide constant idle or speed when off-roading.