THEORY OF OPERATION - CONTINUED
POWERTRAIN - CONTINUED
Variable Shift Control.
Variable shift control uses engine speed to provide optional autoshift points. Powertrain ECM uses position of vari-
able shift control switch (TM 5-3805-291-10) and engine speed to determine transmission autoshift points.
Variable shift control switch has three powertrain ECM inputs and allows an operator to select a range of operation
Variable shift control switch has three settings: STANDARD, INTERMEDIATE, and ECONOMY. ECONOMY
position allows powertrain ECM to determine shift points at a lower engine speed. Both other positions increase
shift speeds. STANDARD forces transmission to shift at a higher rpm than INTERMEDIATE.
Integrated Braking System.
Integrated Braking System (IBS) enables operator to downshift transmission by depressing left brake pedal.
Downshifting transmission reduces machine ground speed before brakes are actually applied. IBS only changes
transmission speed; it does not change transmission direction. IBS neutralizes transmission if these conditions are
First or second speed is engaged
Transmission neutralizer is enabled