Presentation
6
Power transmission
The transmission is fully automatic and of the planetary gear
type. It has a torque converter with free-wheeling stator and
automatic direct drive clutch (lockup) in all gears. The machine has
six forward and two reverse gears. A hydraulic retarder is
integrated in the transmission.
The dropbox has a differential, which distributes the torque
equally between the front and rear axles, thus reducing tyre and
road wear as well as fuel consumption. The longitudinal differential
is provided with a locking function.
The drive axles are provided with a differential and hub reduction
gears of the planetary gear type. All drive axles have a differential
lock.
Brakes
Retarder
The retarder integrated in the transmission is a hydraulic brake
that acts on the transmission's turbine shaft. The retarder has a
max. braking power of 245 kW (333 hp).
Service brakes
The machine is equipped with compressed air-hydraulically
operated disc brakes, two circuits for the front axle, two circuits for
the front bogie axle, and one circuit for the rear bogie axle.
Parking brake
The parking brake is of the spring brake type, which acts on the
propeller shaft, together with engaged differential lock in the
dropbox. The spring brake has a separate compressed-air circuit
for releasing the brake.
Steering system
The steering system is Volvo-unique, self-compensating, hydro-
mechanical with a secondary steering function. A ground-
dependent pump on the dropbox safeguards the steering function
even if the engine stops, and the machine is still rolling.
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