Governor Adjustment; Governor Troubleshooting; General - Hobart JET-EX 4 Operation And Maintenance Manual

OM-2049

3. Governor Adjustment

A. General
(1) Put a slight tension on governor spring (just enough to crank the coils apart) with adjusting screw
(A, Fig. 2). Install linkage from governor throttle lever to carburetor lever, adjusting length of linkage
so that the throttle arm on the carburetor is 1/16 inch off the full throttle stop. Release spring tension
and operate throttle lever manually to check for any binding or lost motion in linkage. Make correc-
tions as required.
(2) If governor is equipped with bumper screw (C), back out bumper screw until only three or four
threads are engaged and secure with locknut.
(3) Start engine and operate at fast idle until warmed to operating temperature.
(4) Obtain desired no-load speed with adjusting screw (A).
(5) Check regulation by applying and removing engine load. If drop in engine speed between no-load
and full-load is too much, adjust regulation screw (B) to draw spring closer to lever hub. If governor
surges under load, adjust screw (B) to move spring away from lever hub. Repeat until desired regula-
tion is obtained.
(6) Check speed adjustment after making regulation adjustment.
(7) Bumper screw (C) is used to remove a no-load surge only. If governor surges at no-load, turn
screw (C) in slowly until surging stops. Secure adjustment with locknut.
CAUTION: DO NOT TURN BUMPER SCREW IN FAR ENOUGH TO INCREASE NOLOAD SPEED
OF ENGINE.
B. Troubleshooting
When installing the governor, carefully follow the instructions for installation and adjustment. To fur-
ther aid in checking installation and servicing of the governor after it has been in use, check the follow-
ing troubleshooting hints.
(1) Engine speed lugs down when load is applied
(a) Governor improperly adjusted.
(b) Friction in throttle linkage.
(c) Load is too great for engine.
(d) Engine worn, compression too slow.
(e) Timing slow.
(f) Governor running too slow.
(g) Springs in carburetor or throttle mechanism opposing governor action.
(h) Governor worn internally.
(2) Engine over-speeds when load is applied
(a) Governor belt slipping.
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May 20/89