Yes, that does sound like a good thing to try initially anyway. :-)
I have found a very short section in the manual I have that refers to
A centrifugal governor adapted to the intended use of the engine
is flanged onto the injection pump.
With the variable speed controller, any desired speed can be set
within the speed range can be set. The controller maintains this
speed regardless of the load constant. (Use e.g. for pump drive.)
The idle final speed controller prevents the speed from falling
below a minimum and exceeding the specified maximum speed. With a
regulating lever the power of the motor can be adapted to the load
(use e.g. in Vehicles).
End controllers are used for motors that only run at a certain,
fixed speed and must keep this speed between zero load and full
load (e.g. generator sets).
... and for maintenance:-
Oil the Kenuliergnatänge, check for the largest flow rate at the
stop, evil. readjust
Oil the ball heads and bearing points of the levers. The linkage
must not jam. When the regulating lever is in full load position,
the filling lever on the injection pump against the stop. If
necessary, linkage with turnbuckle or readjust on the ball heads.
I think the maintenance bit has lost something in the tranlation! :-)