Ko­matsu short-tail low-emis­sion Dash 11 ex­ca­va­tors

Ko­matsu short-tail low-emis­sion Dash 11 ex­ca­va­tors lower fuel con­sump­tion, im­prove op­er­at­ing ef­fi­ciency

Earthmovers & Excavators - - Contents -

Ko­matsu has launched two new short-tail ex­ca­va­tors, the 14-tonne PC138US-11 and the 23.7 tonne PC228US-11, pow­ered by lowe­mis­sion Tier 4 en­gines, and fea­tur­ing ad­vanced elec­tronic en­gine and hy­draulic con­trol sys­tems. The PC138US-11 has a Ko­matsu SAA4D95LE-7 en­gine is rated at 73kW, while the PC228US-11 is pow­ered by a Ko­matsu SAA6D107E-3 en­gine rated at 123kW. The PC228 is also avail­able in a LC ver­sion with ex­tended un­der­car­riage.

Both ex­ca­va­tors com­ply with US Tier 4 Fi­nal emis­sions reg­u­la­tions, re­duc­ing NOx and PM emis­sions by 90 per cent com­pared with their Dash 8 pre­de­ces­sors. They also in­cor­po­rate new Ko­matsu fuel-sav­ing tech­nol­ogy, in­clud­ing auto de­cel­er­a­tion to low idle if the ma­chine idles for more than a few sec­onds, auto idle shut­down, and en­hance­ments to the main hy­draulic con­trol valve to re­duce hy­draulic losses.

“The Dash 11 ex­ca­va­tors now fea­ture im­proved match­ing be­tween the en­gine and the hy­draulic pumps, al­low­ing the en­gine to op­er­ate at the most ef­fi­cient speed and save fuel,” Ko­matsu na­tional busi­ness man­ager – con­struc­tion Am­ber Rickard says. “Higher pump dis­place­ment al­lows the ma­chines to achieve higher flow out­puts at lower en­gine rpm.

“Known as Low Speed Match­ing, this sys­tem also pro­vides bet­ter pick-up and re­sponse to hy­draulic flow de­mand, as well as pro­vid­ing fuel sav­ings in low, medium, and high duty cy­cles.

“Both ma­chines also fea­ture our Vari­able

Speed Match­ing con­trol sys­tem, which matches en­gine speed to pump de­liv­ery across both high and low duty cy­cles, and re­duces fuel con­sump­tion by low­er­ing en­gine speed dur­ing low flow op­er­a­tions.”

Six work­ing modes fur­ther match en­gine and hy­draulic power out­put to spe­cific ap­pli­ca­tions, and in­clude power, econ­omy, fine op­er­a­tions/ lift­ing, breaker, at­tach­ment power and at­tach­ment econ­omy modes. Both mod­els also in­cor­po­rate a vis­cous fan clutch sys­tem that en­sures op­ti­mal cool­ing fan speed, re­duces fuel con­sump­tion and con­trib­utes to lower noise lev­els.

The short-tail swing ra­dius on both ma­chines al­low them to work in far more con­fined ar­eas than a con­ven­tional ma­chine. The PC138US-11 has a tail-swing ra­dius of 1480mm and the PC228US-11 has a tail-swing ra­dius of 1785 mm.

“They are equipped with a con­toured cab de­sign and con­vex slid­ing door that al­low the cab to swing within the same ra­dius as the coun­ter­weight, mak­ing them ideal for ap­pli­ca­tions such as road­works and ur­ban or un­der­ground en­vi­ron­ments,” Rickard says.

De­spite their com­pact de­sign, both ex­ca­va­tors fea­ture full-size in­te­grated ROPS cabs with a wide front view of the work area.

“The cabs also fea­ture a new high back, air sus­pen­sion op­er­a­tor seat with lum­bar sup­port and more ro­bust slide rails for im­proved re­li­a­bil­ity,” she says.

Main­tain­abil­ity of these ma­chines has been fur­ther im­proved, with left- and right-hand ser­vice doors al­low ac­cess to all ma­jor main­te­nance points from ground level – sim­pli­fy­ing reg­u­lar main­te­nance checks. Both mod­els are also fit­ted with fan belt auto ten­sioner, elim­i­nat­ing the need for fan belt adjustments.

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