Injection Pump Throttle Lever
The throttle lever is the mechanical lever on the injection pump that sets the target speed of the governor. Its two ends are limited by mechanical stops: idle at one end, maximum speed at the other. The cable of the electronic throttle kit is attached to this lever and drives the lever's movement between these two stops.
The points to watch during installation are mechanical:
- Attachment point: the cable must be attached to the lever as perpendicular as possible to the lever's plane of movement and without free play. A diagonal pull creates both a loss of force and friction.
- Stroke: the actuator's movement must finish without the lever bottoming out on its mechanical stops. If the lever hits the stop and the actuator keeps pulling, the cable is stretched, the stall protection trips or the cable elongates over time.
- Return: the lever's own spring brings it back to idle when the cable is released. If this spring is not working, the kit cannot close the throttle.
The non-invasive top-mounting approach of the GS740 and GS740-3P is exactly about this point: the original lever stays in place, it is not removed; the cable is attached from above. That way, if the kit is removed, the engine returns to its old mechanical operation and the throttle lever remains operable by hand.
Context in which this term is used: Speed control of three pumps in drilling