While subtle internal engine changes to meet latest European emissions rules may be the main reason for the ‘Stage V’ identification on JCB’s latest Fastrac 4000 Series, engineers have incorporated numerous other improvements at the same time.

These 175-235hp machines still have their unique combination of speed, comfort, road safety, field traction and four-wheel steer manoeuvrability, but a new auto engine shut-down feature and longer service intervals help further reduce total cost of ownership. There is also now a factory-fitted Trimble precision guidance option for the first time.

Uprated axles increase payload capacity and enhance durability, while new tyre options and a locking front axle differential help deliver better field traction.

The engine changes needed to meet Stage V emissions have no impact on power outputs, which continue unchanged at 175hp, 208hp and 235hp maximum output, and the same goes for torque.

But running costs are reduced thanks to the new engine Auto-Stop feature, which shuts down the engine after a period at idling speed to eliminate unnecessary fuel use, and engine oil and filter service intervals that are extended from 500 hours to 600 hours.

New heavy-duty JCB axles deliver power from the stepless (CVT) transmission have 33% higher load ratings than before, allowing payload capacity to be increased. This has also necessitated an upgrade to the braking system.

At the same time, the new axles are more durable because of larger hubs and bearings, and larger kingpin bearings fitted.

More advanced ‘VF’ category, high-speed rated field traction tyres are also new options to enable operators to make the most of the Fastrac’s 50:50 static weight distribution.