Komatsu has introduced improved models of its D51 dozers with updates including a new engine, transmission and cab improvements.
The new D51EX-24 and D51PX-24 are both powered by a 131-horsepower, 4.5-liter Komatsu SAA4D107E-7 engine. The engine improves fuel efficiency by 13 percent over previous D51 models and meets Tier 4 Final standards through the use of a diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR). The dozers feature 100 percent passive regeneration without a diesel particulate filter (DPF).
The engine also features an Economy mode and auto-idle shutdown.
Also under the hood are a new water-cooled variable geometry turbocharger and a new transmission. Operators can choose between two transmission modes: A quick shift, three-speed mode and a variable 20-speed mode.
Inside the cab, operators will find a new 7-inch high resolution color monitor that displays machine performance and diagnostics in real time. A rearview camera system comes standard along with a heated, air suspension seat with adjustable arm rests.
The Komtrax 5.0 telematics service keeps operators and owners up to date on DOC status, DEF and fuel levels, operating hours, location and maintenance alerts. The new D51 dozers also support Komatsu’s Operator ID system which can sort Komtrax data by job, application or operator.