Kobelco and Yanmar @ Smopyc

At Smopyc in Zaragoza, Kobelco showed a Yanmar-powered crawler excavator, the SK210 SNLC-11E, which covers the most important segment of the construction market. The arrival of the new Yanmar and Isuzu engines on the conventional and short-radius machines between 18 and 39 tonnes operating weight, which may have been seen at the previous SAMOTER.

Kobelco has chosen the 4TN107FTT Diesel engine

The Yanmar 4TN107FTT ousts another Japanese engine from the conflict, the Hino engine best known, at these latitudes, for road applications. Yanmar thus cashes in on a prestigious endorsement since the presentation of the 4TN101 and 4TN107 at INTERMAT Paris. A full-fledged raid above the fatidic 100 kW power line, to expand the application range. It is a 4-cylinder Diesel engine, with a 1.115-litre cylinder displacement (AxC 107×127 mm). Common rail, twin-stage turbocharger, more efficient at low rpm, the top power of the 4TN107 series is 155 kW at 2,200 rpm, torque 805 Nm at 1,500. Compared to the previous Hino J05EVA-KSSA engine, there is a difference in displacement. The current Yanmar stands at 4,567L compared to the previous 5,123L. The power rating on this machine is higher than the previous engine, 127 kW at 2,000 rpm compared to the previous 124 kW at the same engine speed. It has increased from 660 Nm at 1,600 rpm to the current 805 Nm at 1,500 rpm, compared to 1,600 rpm for the Hino engine. For other machines, however, Kobelco has turned to compatriots who are more oriented towards larger displacements: Isuzu.

Kobelco SK210 SNLC-11E at Smopyc

Apart from the Yanmar engine the most important change of the Kobelco excavator seen at Smopyc can be seen on the new high-end SK230SRLC-7 and SK270SRNLC-7 short-radius. These are in fact two machines whose new design revolves around the Yanmar engine. The iNDr architecture, in fact, has strongly influenced the cooling dynamics. But, let us return to the SK210SNLC-11E that we saw at Smopyc. From a hydraulic point of view, in fact, nothing changes. On the new SK210SNLC-11E we still have 2 x 220 l/min. The manufacturer’s approach is to cut pressures almost to zero at the moment when no movement is taking place. This is often only a few seconds, but added up over the course of a day it makes all the difference. This results in a restart of movements that some operators perceive as ‘slow’. In reality, the machine ‘makes up for lost time’ with greater efficiency in movements also linked to a very effective recycling of oil flows.