Electric Governor System Adjustment (Barber-Colman Governor Kit); General; Actuator Linkage Adjustment - Hobart 60PL20 Operation And Maintenance Manual

F. Electric Governor System Adjustment (Barber-Colman Governor Kit)

(1) General

The Hobart electric governor kit, used on units built after November, 1990 is identified as Hobart
Part No. 282671, and consists of Barber-Colman governor parts with brackets and hardware
added by Hobart Brothers to install the governor system on generator sets in this series. The Bar-
ber-Colman governor system consists of (1) an electric controller, (2) an actuator, and (3) a
magnetic-pick-up that is installed in the flywheel housing, which senses engine speed off the fly-
wheel teeth.
Two electric governor system main components, namely the magnetic pickup and controller, have
critical adjustments which can affect engine performance and therefore generator output. The ad-
justment of the actuator linkage can also affect engine performance.
When the complete system is to be checked and/or adjusted, a definite sequence of procedures
should be followed:
First - Check or adjust actuator linkage
Second - Check or adjust magnetic pick-up
Third - Check or adjust electric control box

(2) Actuator Linkage Adjustment

The proper adjustment of the mechanical linkage between the governor actuator and engine
speed control lever is important to the satisfactory operation of the complete system. Two definite
rules must be followed in making the adjustment:
Adjust linkage must use the FULL TRAVEL of the actuator output shaft.
Linkage must move engine speed control lever from FULL IDLE to RATED SPEED posi-
tion, or VERY CLOSE to FULL SPEED position to allow the engine to pull maximum load.
With the engine stopped, refer to Figure 3 and proceed with linkage adjustments as follows:
(a) At the engine speed control lever (6) , loosen the jam nut (5) that fastens the ball joint (7) to
the threaded rod, and remove the ball joint from the engine speed control lever.
(b) Rotate the ball joint - outward or inward - on the threaded rod (8) , as necessary, to acheive a
distance of 6 inches (152 mm) from center to center on the swiveling portions of the two ball
joints (4 and 7) .
(c) While holding the removed ball joint in its mounting hole in the engine speed control lever,
compare the TRAVEL of the ACTUATOR SHAFT (2) with the travel of the engine speed control
lever (6) .
(d) At FULL IDLE position, the actuator shaft should be pulled ALL THE WAY DOWNWARD.
(e) For RATED SPEED, the actuator shaft should come out far enough to force the engine
speed control lever to use ALL OF ITS TRAVEL as it moves upward.
(f) Re-attach the ball joint to the engine speed control lever with the lockwasher and nut.
(g) Tighten the two jam nuts on the threaded rod firmly against their respective ball joints.
December 31/91 Revised
OM-2053
2-3
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