D37-23 and D39-23 form the nomenclatures for Komatsu America Corp.’s new line of crawler dozers, developed to be smarter and more productive pieces of equipment.
Developed for compact jobs, the D37-23 and D39-23 are particularly suited for applications that include land clearing, grading, forestry, and site work. A full guarding package, hydraulic winch, and other attachments are available for easy customization to meet specific customer requirements.
Long track-on-ground standard (EX) and low ground pressure (PX) models offer customers flotation and weight distribution options to best match their applications. Operating weights range from 18,386 to 21,363 lb (8340 to 9690 kg) depending on the configuration and model.
The crawler dozer models are equipped with the most recent KOMTRAX technology, which is fully integrated with Komatsu’s Tier 4 technology. Machine operating information, such as hour meter, location, cautions, load ratio, fuel consumption, and maintenance alerts, are sent to a secure website via wireless technology.
The KOMTRAX fleet monitoring system increases machine availability, reduces the risk of machine theft (compared to machines that are not KOMTRAX-equipped), allows for remote diagnosis by the distributor, as well as other information to enable efficiency and productivity.
Built upon Komatsu’s Tier 3 technology, the Tier 4 Interim SAA4D95LE-6 engine provides the same high power while lowering fuel consumption by up to 10% when compared to the previous models. Komatsu’s Tier 4 Interim engine platform uses an advanced electronic control system to manage airflow rate, fuel injection, combustion parameters, and aftertreatment functions to optimize performance, reduce emissions, and provide advanced diagnostic capability.
Komatsu says the engine’s new diesel oxidation catalyst (KDOC) has an integrated design that does not interfere with daily operation, removing soot using 100% passive regeneration without the need for a diesel particulate filter (DPF). The KDOC does not have a scheduled replacement interval like a DPF and is designed for no required maintenance. For owners, this means lower owning and operating costs due to less complexity and seamless operation for the operator.
A new variable flow turbocharger, direct flow air filter, high-pressure common rail fuel injection, 16-valve cylinder head, and exhaust gas recirculation are used on the D37-23 and D39-23, resulting in precise air flow management and more complete combustion, which also contributes to the elimination of a DPF.
A steeply sloped engine hood and forward cab design allows for improved blade visibility, ride quality, enhanced grading ability, and overall comfort, says Komatsu. The cab also has an integrated ROPS/FOPS structure and is designed using large glass windows for better visibility.
Internal cab air pressure and air filters minimize dust entering the cab, and viscous cab damper mounts suppress noise and vibration when traveling over rough terrain.
A newly designed power angle tilt blade with a highly durable box structure and good curvature rolls material efficiently and improves productivity. Standard adjustable blade pitch allows the operator to adjust the aggressiveness of the cutting edge for varying applications. The new hydraulic blade angle toggle switch improves ease of blade operation.
Both crawlers feature two selectable working modes, economy (E) and power (P), that match machine performance to the application. E mode is intended for all general dozing, leveling, and spreading applications providing adequate speed and power while saving fuel. P mode is intended for slot dozing, ripping, uphill dozing, or other applications that require maximum power where engine power has priority over fuel consumption.
The D37-23 and D39-23 incorporate new proprietary engine and hydrostatic transmission (HST) pump control technology to improve operational efficiency, increase productivity up to 4%, and reduce fuel consumption to levels lower than a conventional HST control system. This Komatsu-exclusive feature reduces fuel consumption by up to 10% in P mode in demanding working conditions and up to 20% in E mode under lighter load conditions compared to the prior model.
Both models offer two gearshift modes: variable and the new customizable quick shift. Variable shift mode provides 20 incremental speed settings for the operator, while the new customizable quick shift provides three speed settings that can be adjusted in the monitor to obtain the right speed for different operator preferences.
Komatsu’s ergonomically designed Palm Command Control System (PCCS) gives operators maximum control, offering a relaxed posture and fine control to minimize operator fatigue. Thumb push buttons simplify transmission speed setting shifts that are indicated graphically on the monitor. The travel lever turning sensitivity can now be easily adjusted on the monitor to better match operator preferences. Electrohydraulic controls incorporate a new blade angle switch and float switch. The blade feel can also be adjusted on the monitor to best match operator preference.
The interior cab decibel level has been decreased to 70 dB (D37-23) and 72 dB (D39-23) for a quiet work environment. A comfortable standard air ride seat with heat further enhances operator comfort. A standard rear view monitoring system can be synchronized with reverse operation.
A new 7-in high-resolution LCD color monitor in the cab displays all pertinent machine information. An easy-to-use tab system allows operators to select the parameters they want to see and also provides quick troubleshooting for a service technician with onboard diagnostics.
Daily engine checks are grouped at the left-hand side of the engine compartment. The engine oil can be drained at the front of the machine without crawling under it. The rear-mounted swing-up electronically controlled hydraulic fan allows for easy checking of the radiator, oil cooler, and charge air cooler. A manually reversing fan allows for quick cleaning of the side by side coolers.