Komatsu Logs a New Timber Machine

July 9, 2025

Matt Wolfe

The TN785D’s hydraulic system has a mas flow rate of 138 gpm (522 L/min). (Komatsu)

Komatsu has announced a new swing machine designed to move large quantities of timber in log loader and millyard environments. The TimberPro TN785D is Komatsu’s most powerful and highest capacity machine to date. According to Komatsu, it was built with proven components and new features to meet the demand of high productivity swing applications.

According to Komatsu, the TN785D is its most powerful swing machine to date. (Komatsu)

“TimberPro has designed this machine to excel in high demand millyard applications where lift capacity, reach combined with stability and hydraulic response are key to maximizing productivity,” said Nathan Repp, product manager for Forest Products at Komatsu. “We understand the real-world demands our customers face in these environments, and the TN785D was designed to meet those needs.”

Komatsu states that the TN785D features a redesigned 12-roller track frame to provide a long stable platform for even weight distribution with high mobility and improved durability. The operator cab has been raised 51 inches (130 cm) and includes a rear-facing door for easier entry, an overhead skylight for full visibility and power tilt for efficient transport.

The TN785D has a reach of more than 44 ft (13.4 m) for a wide working area. (Komatsu)

Other features of the TN785D include a reach of more than 44 ft (13.4 m) for a wide working area, high-performance hydraulics that offer consistent speed with simultaneous circuit commands and a closed-loop hydrostatic swing for precise movements.

The TN785D is powered by a 390-hp (291-kW) Cummins L9 diesel engine with an aftercooled variable geometry turbo and EGR (exhaust gas recirculation) cooler that is EPA Tier 4 Final emission certified. The machine has an operating weight of 116,500 lb (52,844 kg) with a rated ground pressure of 9.6 psi (0.67 kg/cm2). Maximum travel speed is 4.72 mph (7.6 km/h).

The hydraulic system consists of a load-sensing, pressure-compensated open loop system and dedicated closed loop systems. The main pump is a variable displacement piston with a max flow rate of 138 gpm (522 L/min). The hydraulic motors for travel and swing are closed loop with a parking brake and holding brake, respectively.