TM 53810-300-24&P-3
14.3.3
LIMITING SPEED MECHANICAL GOVERNOR ADJUSTMENT
(Variable Low-Speed)
The variable low-speed limiting speed mechanical
governor is used on 6-71 highway vehicle engines where
the same engine powers both the vehicle and the
auxiliary equipment for unloading bulk products (such as
cement, 'grain or liquids) and a high idle speed range is
desired during auxiliary operation.
During highway operation, the governor functions as a
limiting speed governor, controlling the engine idling
speed and limiting the maximum operating speed. At the
unloading area, the throttle is left in the idle speed
position and the speed adjusting handle (Fig. I) is turned
to obtain the speed required to operate the auxiliary
equipment. The governor then functions as a variable
speed governor, maintaining a constant speed even
when the load is constantly changing, during the'
unloading operation.
Before resuming highway operation, turn the speed
adjusting handle back against the stop, then turn it back
in about one-quarter of a turn.
Governor identification is provided by a name plate
attached to the governor housing. The letters V.L.S.L.S.
stamped on the name plate denote a variable low speed
limiting speed governor.
After adjusting the exhaust valves and timing the
injectors, adjust the governor and position the injector
Fig. 1 - Governor Spring Housing and
Components
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