Steyr took advantage of the bi-annual Agritechnica to debut its new Profi CVT (continuously variable transmission) series tractors. With the new Profi CVT series, Steyr has extended its tractor program with a CVT in the 110 to 130 hp (82 to 97 kW) power range. The Steyr-developed CVT is based on double clutch technology and features two mechanical forward ranges and one reverse range.
Steyr engineers at its St. Valentin, Austria, location designed an intelligent power split concept that allows for speeds up to 50 km/h (31 mph) at a reduced engine speed of only 1750 rpm. The transmission also allows creeper speeds down to 20 m/h (66 ft/h).
All new Profi models are equipped with FPT Industrial engines with a turbocharger and intercooler as well as Steyr ecotech, featuring SCR exhaust aftertreatment to meet Stage III B emissions standards, and an intelligent control system for the engine-transmission-management. The 4.5-L, four-cylinder engines are equipped with an electronic common rail injection system. Due to a powerboost, an additional power output of 22 hp (16 kW) is available for transport and PTO applications.
Profi CVTs feature a new system for idling speed control. Thirty seconds after the operator has left the cab, the idling speed will automatically be reduced from 850 to 650 rpm unless either electronic remote valves or the hydraulic system are in operation. Fuel consumption is further reduced by means of a newly developed software function, lowering operating costs accordingly.
In terms of the Profi CVT’s cab, an improved Multicontroller provides for simplified operation and optimum workplace ergonomics. The Multicontroller is fitted with back-lighted operating keys allowing for easier and safer operation in the dark. Up to seven key functions of the tractor can be operated with just one lever, and only one button is needed for changes of direction.
The window area alone offers 5.78 m² (62 ft²) in the four-post design-cab. The integrated roof window allows for a 105° angle of vision on the front work space. Steyr also claims it is one of the quietest cabs in the tractor market, with a 69 dB(A) noise level and an optional cab suspension.
Front end construction and the central drive set of the new tractor design enables a steering angle of 55°, allowing for improved driving characteristics and a turning radius of just 4.04 m (13 ft).
An electric parking brake is standard on the Profi CVT, and can be engaged or disengaged comfortably from the steering column. The parking brake is activated automatically when the engine is switched off, and disengaged when the tractor is started again. A pneumatic trailer brake, operated via the powershuttle, is also part of the standard equipment.
The tractor's hydraulic system consists of an axial piston pump that delivers a high flow capacity of up to 125 L/min (4.4 ft³/min), including pressure and flow regulation if needed.
The rear hitch is capable of lifting up to 7850 kg (17,306 lb), and the front hitch lifts up to 3100 kg (6834 lb). A maximum of seven electrohydraulic remote valves allow for the control of a wide range of functions.
Front hitch lifting configurations can be preset by means of a management program. When the respective working depth is reached during operation, the automatic load control of the front hitch activates the electronic float position, making the operation of front mounted mowers more comfortable.
For tractors which are used in municipal operations, the front mounting space is one of the most important areas for the use of implements. Over the past few years, however, implement weights and implement reach have increased steadily. To satisfy the more rigorous requirements that result, for example with respect to torsional moments, Steyr has developed the next generation municipal frame, which it has also introduced in the Profi CVT.
With the Steyr municipal combi-frame, fast mounting is possible in the front mounting space. Central to the system is a standardized quick-change plate, which can be fitted as an option with a front hydraulic combination. This makes it possible to use front-mounted implements safely and to minimize set-up times when changing implements.
For the first time with Steyr municipal frames, "side-rails" are used for a more a sturdy design and torsion-resistant construction. A new central support bracket, integrated in the combi-frame structure contributes to a buckle-resistant and torsion-free structure allowing heavy mounted implements with high torsional moments can be operated safely.
There is also an optimized rear-axle support. It guarantees optimum force transfer and avoids overloading the front-axle support, says Steyr. The use of snowplows/blowers and slope mowers involves high loads. To address that issue, the quick changing plate has been enforced and additional struts added to the rear axle support structure.
With the municipal frame torsional moments of up to 52 kN/m (5.8 ton/m)—according to model —can be absorbed without difficulty.
In the front area new adjusting strips are also used, making it simple to make a longitudinal adjustment to the municipal plate. As an option there is also a new heavy-duty frame that is used wherever high lateral forces are to be expected, for example where slope mowers have long side arms.