Engine - Strong GR4 Procedures Manual

Engine

The power unit is either a Cummins diesel or a Ford gasoline engine. These water-cooled engines are
designed for industrial application and are the best engines for the job. The engine is also the most costly,
single piece of equipment on the machine. When referring to the manual for service recommendation, use
those given for the most severe conditions.
The engine speed is pre-set for optimal performance. Never slow the engine RPM down when pumping
under full load, as this will cause the engine to "lug", setting up high cylinder head temperature and
causing engine damage.
The engine is equipped with a full range variable speed governor. This means that at a given throttle
setting, the engine will maintain a given PRM unless overloaded. When the engine RPM falls off, it is
caused either by load being greater than the engine can carry or the engine is not developing its required
horsepower. When this occurs, check to see that the pumping pressure is not too great as caused by a
restriction in the lines or a mix too dry. The other possibility is the engine not getting fuel properly, or the
air intake could be restricted.
The engine has been serviced with a break-in oil which should be changed after 40 hours of service and
replaced with a good grade of engine oil. (e.g. Rotella). (See engine owner's manual for
recommendations for your engine and operating conditions).
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