Tests conducted in conjunction with the DLG, one of Europe’s
leading test and research organisations, show that 83% of the engine
power on the AXION 820 is transferred to the wheels, highlighting
the efficiency with which the HEXASHIFT transmission utilises engine
power and making this one of the most efficient tractors in its
class on the market.
Claas Axion 820 in the DLG test
In the tests, the DLG compared the engine and transmission
performance of the AXION 820, against a similar sized competitive
tractor. In addition traction and engine tests were also conducted
on the higher powered AXION 850.
AXION 820 v competitor
The AXION 820 has a nominal
power output of 189hp (139kW) with a maximum power output of 197hp
(145kW), with latest models also benefiting from a further power
boost to 232hp (170kW) from the CLAAS POWER MANAGEMENT (CPM) system.
main message to emerge from all the test data was how efficient
the driveline in the AXION 820 was in transmitting power and the
fuel efficiency of the engine.
- 91% of engine power was available
at the PTO, so highly efficient
- 83% of engine power was converted
into useful power at the wheels
- Constant power was over 800rpm
- Maximum PTO torque 787 Nm with
a 54% torque rise
- Fuel consumption was flat across the main engine
range at 221 gms/kW/h.
terms of performance in the field, the efficiency with which both
the AXION 820 and 850 transfer power to the wheels, results in
a tractor that will achieve higher work rates at reduced fuel usage.
The wide constant power range will avoid the need to change gear,
whilst the high torque and impressive torque rise mean that the
tractor will keep pulling and again avoid the need to change gear,
and so loose momentum when going up-hill or when soil conditions
change through the field. At the same time, the flat fuel consumption
means that whatever the load, consumption remains constant.
Accurate, realistic testing
The tests on the AXION
820 and 850 were conducted using the DLG’s
unique Drawbar Test Vehicle. This is designed to replicate a field
environment and so provide more comprehensive and accurate information
than is possible with a static test or other field based measuring
The Drawbar Test Vehicle is able to test the total performance
of the tractor within a controlled environment that ensures that
replicated results can be achieved, i.e. that the results are consistent
and if repeated the same result will be achieved. The major drawback
of field based testing is that soil types and conditions vary too
much and so can have a major impact on results, making a realistic
comparison between tests and machines impossible.
The Drawbar Test
Vehicle is linked to the tractor by a load-cell drawbar and the
computer and test measuring systems are linked into the tractor’s
fuel, hydraulic, PTO, electronic and engine management systems.
Where required, in order to place the tractor under load, as it
tows the vehicle down the test track, an onboard Dynamometer places
varying levels of braking effect on the lorry’s
rear axles to create a ‘pull’ at the drawbar which
can then be measured.
ISO rated engine output (kW)
Max PTO power at engine rated speed (kW)
% of max engine power available at PTO
Max PTO Torque
% of max boosted engine torque
Best fuel consumption (Grams/Kilowatt/hour)
Maximum drawbar pull (kW)
Ratio maximum drawbar pull to engine power
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