Having waited nearly four years after the launch of its largest pivot steer telehandler, JCB has given the TM420 the ‘S’ treatment, following in the footsteps of the TM320S.
The new TM420S features the same lifting parameters as the current TM420, 4.1 tonnes to 5.45 metres, however, it features a significant power increase over existing models at 173hp. This is developed from its Stage 5, 4.8-litre JCB DieselMax engine, which makes it the first machine to access the higher power output from this JCB engine.
Designed with silage pit applications in mind, power-to-weight ratio stands at 17hp per tonne, while torque is now up to 690Nm. It can now also be specified with 26-inch wheels and has a heavier duty chassis and axles, compared to the standard TM420, to deal with the increased power.
In addition, an eight speed powershift transmission features, with torque lock up in every forward gear and capable of 50kph. It can be operated manually, shifting through the gears using joystick buttons or by switching to automatic power-shifting for gears five to eight.
Regenerative boom hydraulics use the weight of the boom to bring it down faster, improving cycling times, while a twin hydraulic pump installation totalling 100cc capacity delivers oil at up to 160 litre/minute and a maximum of 100 litres/minute for auxiliary applications, according to the company.
The new Command Plus cab features a one-piece windscreen sweeping up and over the operator’s head, offering an increase in forward visibility by 13 per cent, according to the manufacturer.
Internally, a simplified control layout can be found, with most functions accessed through a switch panel on the right-hand pillar. An assignable ‘hot key’ button on the joystick can be programmed for one of a number of functions, such as activating work lights, answering the phone or diff-lock engagement. The steering column features a ‘set and forget function’.
Cab steps are illuminated, and having parked the machine in the dark, the programmable 360-degree lighting can remain switched on for a while before turning off automatically.
The rest of the TM range has also had a refresh, which all get the new cab, styling and eight speed transmission. In TM320 and TM420 models, as standard these are rated to 40kph, with torque lock up reversed for gears five to eight, while the TM320S has the option of the 50kph version.
All models have also received a five horsepower increase with the advent of the new Stage 5 engines. The TM320 now boasts 130hp and 550Nm, while the TM320S and TM420 get 150hp with 600Nm of torque output.