Caterpillar has introduced a pair of new telehandlers to its lineup, the TH406 and TH407, to replace the TH220B and TH330B for construction, agriculture, landscaping, and materials supply applications.
The 406 and 407 differ primarily in lift height and reach. Both machines are capable of lifting 8100 lb (3700 kg) and have two-section booms, giving 20-ft (6-m) reach on the 406 and 24-ft (7-m) reach on the 407. The 406 can lift more than half its 15,870-lb (7200-kg) operating mass, while the 407 weighs slightly more at 16,980 lb (7700 kg).
Cat provides the power with a C4.4 diesel, developing 100 hp (75 kW) and 410 N·m (302 lb·ft). An optional version of the same engine with ACERT technology increases power to 125 hp (93 kW) and torque to 496 N·m (366 lb·ft). Both versions meet Tier 3 emissions standards and are both turbocharged and aftercooled.
Four-wheel drive is standard, and an automatically engaging limited-slip differential is fitted in the front axle. The powersynchro transmission has five forward speeds and three reverse, giving a forward top speed of 25 mph (40 km/h).
Tight spaces are no trouble for the machines, as three steering settings adjust for distance moving and tight cornering. Conventional two-wheel steering for normal movement, as well as circle steering and crab steering for maneuverability, are easily adjustable from the cab. Each mode automatically realigns the wheels to the most ideal position.
Lifting and extending movements are smooth and controlled thanks to load-sensing hydraulics that operate all three directional functions proportionally. The handlers can be fitted with other attachments and also can tow, with up to 19,620-lb (8900-kg) on the TH407 with the more powerful engine option. A Z-bar linkage and improved breakout force make the handlers viable options for small excavation projects.
The cab, shared by both models, has been redesigned with new windows and controls. A single electrohydraulic joystick makes controlling the boom easier, while a button on the joystick disconnects the transmission to send increased engine power to the hydraulic system for faster boom operation. An LCD screen that combines engine, transmission, and fluid data has replaced traditional dials and gauges.
Forks are common in construction and agricultural applications, but buckets, grapples, and lifting tools are easily changed due to the standard manual quick-coupler. An optional hydraulic coupler allows tool changes from the cab. Maintenance is simplified by centralized access points.