Oshkosh Corporation JLG H800AJ, Operation And Safety Manual

Page: 79 / 164

SECTION 4 - MACHINE OPERATION
3121769 – JLG Lift –
4-7
4.3 POWERTRAIN OPERATING MODES
The powertrain system consists of the engine, clutch, Integrated
Motor Generator (IMG), and hydraulic pumps. When the clutch is
engaged, the diesel engine power transmits through the clutch
to the shaft of the IMG, then to the hydraulic pumps.
There are two operation modes for the powertrain system –
HYBRID Mode and ELECTRIC Mode. These modes can be selected
through the Engine Start/Mode Select switch.
HYBRID Mode
Under this mode, the engine is started with
engine start switch. Once started, the engine runs
continually until either the Power/Emergency
Stop is pressed down, or the mode selection switch is flipped to
ELECTRIC Mode position. The clutch is engaged under this mode
so engine, clutch, IMG, hydraulic pump turn at the same RPM.
The engine drives the IMG to generate electricity to charge the
battery pack and also drive the hydraulic pumps to provide
energy needed to operate boom functions and drive functions.
Some functions need additional power provided by the IMG to
achieve maximum performance. The Hybrid Electric Control sys
-
tem can sense if the engine power is enough to operate the com -
manded function. The IMG will then utilize stored energy from
the batteries to provide the additional power required for that
function.
The IMG does not do any charging if a function is active or if Sky -
Power is turned on..
The engine will run continuously until stopped whether it is
being used for charging or not.
+