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C. General description
when the tractor is heavily loaded. Additionally, the speed
differences between gears are evened out.
The hydraulic coupling also protects the clutch disc and
other transmission components from uneven and
excessive load peaks.
C4.2. Gearbox
The speed gearbox has four synchronized gears which
are controlled with a speed gear lever. In addition, the
gearbox has three range gears; LL=creeper range
(alternative equipment), M=Medium range and H= High
range. M and H ranges are synchronized. All this range of
gears are controlled with one lever.
C4.3. Powershift
In addition in front of the gearbox is a 3---step quick---shift
gear, the Powershift.
The main gearbox has 8 speeds forward/reverse and
with LL (alternative equipment) 12 speeds forward/re-
verse. The 3---step Powershift gear on the tractors give
24 gears forward/reverse and with LL (alternative
equipment) 36 gears forward/reverse.
Shafts and gearwheels in the gearbox are pressure lubri-
cated.
Control of the Powershift function is also controlled by the
electronic control unit, at which time the gearing is
selected according to the driving conditions.
Manual control of the Powershift--- gears is done with the
push buttons on the gear lever. The driver can choose
from the system, preprogrammed automatic functions of
Powershift for different driving conditions and power
shuttle.
The digital display panel in the tractor keeps the driver
informed at all times by displaying the status of different
operations, e.g.:
--- d r i v i ng d i r e c t i o n
--- w h i c h o f t h e Po w e r s hi ft --- g e a r s is e n g a g e d
--- c h o s e n a u t o m a t i c o p e r a t i o ns
--- o u td oo r t e m p er at u r e
--- s h o w s w h e n t h e P T O i s e n ga ge d
--- i n di ca t e s a n y p o s s i b l e e r ro rs w i t h a s e rv ic e f u n c ti on
code
And in addition it suggests when to change to a lower or
higher gear.
C4.4. Rear axle
The rear axle is fitted directly to the gearbox. The
differential lock in the rear axle is electro---hydraulically
controlled. When it is engaged, pressurized oil is pumped
to the multi---disc differential clutch, and this causes the
differential to lock. When the brake pedal is pressed the
differential lock is automatically disengaged. An indicator
lamp on the instrument panel lights when the differential
lock is engaged.
Final drives are of the planetary gear type. From the
planetary gears power is transmitted to the rear wheels.
C4.5. Powered front axle
NC28
The powered front axle is driven from the gearbox bevel
pinion shaft front end.
Front wheel drive can be engaged and disengaged
electro---hydraulically. When 4WD is engaged the springs
force the discs together and four---wheel drive engages.
Consequently the 4WD is always engaged when the
engine is stopped (multi---disc clutch not pressurized).
In addition when braking, the front---wheel drive always
engages in order to provide the braking function for the
front wheels.
C4.6. Power take ---off
A6181--- 19
The PTO rotating speed is selected with a lever, which can
select either 540 r/min or 1000 r/min nominal rotating
speed. Engagement and disengagement is electro---
hydraulically through a different button. It is also possible
as alternative equipment to have a 540E (750) r/min PTO.
The control unit of the gearbox also controls the function
of the power take---off. This makes the power take---off
engagement smooth without loading the implement. The
display shows a symbol if the power take---off shaft is
rotating.
The power take---off shaft is easy to change. As standard
the tractor is provided with a 6---spline shaft and as extra
equipment shafts with 21---, 20---, 6--- or 8 splines for
greater torque can be fitted on the tractor.
As alternative equipment a ground speed PTO is also
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