In the last issue of《Dimensional classroom》Li，Xiaowei took you to learn about Vogler Super 1680.-3 Li Knowledge of Engine Tail Gas Aftertreatment System of China IV Paver，Current period《Dimensional classroom》Xiaowei will take you to learn Hummer. HD 138i/HD 148i Tail gas post-treatment system of double-drum road roller。

As a masterpiece of Hummer's double steel wheels，New generation modelHD 138i/HD 148iEquipped with the efficient fourth national engine，Power output increased by 25% compared with the previous model%，Rated power up to 125 kW，Cylinder-type after-treatment device is adopted DOC+DPF Carry out tail gas treatment，There is no need to add urea，Maintenance is simple。And the combustion efficiency is improved by 15 percent%，While maintaining a low fuel consumption level，It is cleaner and more environmentally friendly！

Compared to older models，The operating system has been fully upgraded.，It also includes the addition of functional icon switches associated with the post-processing system。Humvee HD 138i/HD 148i The regeneration switch is normally in the neutral position，Placed on the upper side to open the function of prohibiting regeneration，At the same time, the indicator lights up.。It needs to pay attention to the same as other national four equipment.：When the equipment enters the flammable and explosive area，The inhibit regeneration switch needs to be turned on， Prohibition DPF Carry out active regeneration，Avoid danger from high exhaust temperatures due to active regeneration。After the equipment leaves the area，Set the regeneration switch to the neutral position in time.，Do not turn on the inhibit regeneration function for a long time.。For more notes and operation methods, please click the video to view.。

《Dimensional classroom》It is a video column produced by Wittgen China Technology and Training Center to introduce equipment operation and precautions.，Launch on a regular basis，I hope you will continue to pay attention.。In addition，If you have any questions you want to know, you can also send us a bullet screen or leave a message.。