Following on the heels of the Fendt 828 test (04/2015) we take a look at what is new on the Marktoberdorf ringleader, the 939. Can the Stage IV twin-turbo engine put in a better performance than its Stage IIIB predecessor? Read on for our test reveal
Unveiled last autumn, the Stage IV engine Fendt 900s share many of their mid-life spec tweaks with the slightly smaller 800 models. We’re talking here of items such as the 300° wiper, the compressor removed from under the seat and the latest glass screen terminal. Yet the best place to start is under that big bonnet. The 900 series sticks with a Deutz motor, but the 6.1-litre block has now been bored out to 7.8 litres and gains an additional turbo, an extra intercooler (air/water) with a separate cooling circuit and electric pump. Stage IV emission compliance and improved fuel economy are achieved by installing an external cooled exhaust gas recirculation system to work alongside the familiar SCR and DOC package.
Another change is that the pistons are all steel again, rather than aluminium, and 900 series buyers can choose between a standard viscous fan (now with 11 vanes) or a fixed speed Cleanfix reverse fan unit from Hagele (£2,429) with nine adjustable blades. Fendt says this is the more power efficient of the two and was fitted to our test tractor. Efficiency is certainly one area where the 939 knocks it out of the park. Delivering a rated output of 287kW/385hp/390PS (to the ECE-R24 standard which includes the ancillaries), the tractor supplied 258kW/346hp to the DLG pto test stand. This result translates into 10.0kW/13.4hp more than its predecessor, which we tested in the 01/2013 magazine. The engine reaches max output when revving at 1,900rpm, sending 266kW/357hp to the pto, which is 10.0kW/13.4hp less than the Stage IIIB model.
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