---15---
C. General description
C 4.
Power transmission
C 4.1.
HiTech power shuttle
N C29
In tractors with the HiTech power shuttle unit the
traditional forward/reverse gear lever is replaced with a
shuttle lever beside the steering wheel.
By moving the shuttle lever forwards or backwards (the
centre position is neutral) you get a gentle and light
shuttle operation without using the clutch pedal. Use of
the clutch pedal for shuttle operation is still possible.
The power shuttle is placed between the gearbox and the
Power Shift. It has planetary---type gear drives which are
operated by two wet multi---disc clutches, one for forward
driving and one for reverse driving. Multi disc clutches
operate at the same time as the driving clutch due to this
the tractor not having a traditional dry clutch disc.
The function of the HiTech system is controlled by the
electronic control unit of the gearbox. This means that the
electronics smoothly adjust the disengaging and
engaging pressures of the hydraulic multi---discs
according to program. This provides smooth forward and
power shuttle driving.
In addition the system has the HiShift--- operation, with
switches placed in the speed gear--- and range lever,
which controls the operation of the multi---discs when
changing gear. So it is possible to change gear without
using the clutch.
However, traditional use of clutch pedal is still possible.
A6181---16,1
As alternative equipment tractors can be fitted with a
hydraulic coupling for smoother transmission. The
hydraulic coupling allows shock free traction; it is of
particular benefit when ground conditions are slippery or
