The Terex FD4000 front discharge mixer from Terex Roadbuilding is powered by the new 2010 EPA-compliant Detroit Diesel/MTU Series 1300 engine. This new engine gives concrete producers three power package options — 350 hp (261 kW) at 1,350 ft-lb. torque; 380 hp (283 kW) at 1,450 ft-lb. torque; or 450 hp (335 kW) at 1,550 ft-lb. torque — for their Terex three-, four-, five-, six- and seven-axle front discharge trucks. The new engine features a low-noise, integral engine brake that assists with truck braking on the downhill and grades to improve wheel brake service life.

Terex offers two EPA-compliant engine options. Both the Detroit Diesel/MTU and Cummins engine technologies rely on selective catalytic reduction (SCR) to treat post-diesel particulate filter (DPF) exhaust. A 5-gal. (19 L) tank positioned at the rear of the mixer trucks stores the system’s diesel exhaust fluid (DEF). Depending on truck workload, DEF usage averages 2 to 3 percent of diesel fuel consumption.

All new front discharge mixers feature an electronic control module that automatically senses whether or not the truck is carrying a load of concrete. This drives the new load-based shift scheduling that matches the shift patterns to the truck’s load, offering better performance when needed and enhanced fuel economy when possible. The Allison RDS4500 transmission automatically eases engine torque when shifting to reduce stress on the transmission and to increase longevity, according to the manufacturer.

The new four-axle Terex FD4000 front discharge mixer features an 11-cu. yd. (8.4 cu m) drum with a wide 46-in. (117 cm) discharge opening and durable .18 in. (.4 cm) thick AR230 Brinell shell. It boasts the Terex total control system with enhanced functionality. This electric-over-hydraulic system offers a transmission selector to control truck movement once on site and includes single joystick operation of drum start/stop, material charge/discharge, main chute up/down and left/right, and fold/unfold of the optional hydraulic folding chutes.

Terex engineers protected the more sensitive electronics on the FD4000 — including the hose heat fuse, hydraulic tag fuse, engine power, SCR power, air dryer fuse and DEF hose heat relay — in their own sealed compartment. This enhances system longevity and offers easier access to the electronics for diagnostics and servicing.

While redesigning the engine compartment to accommodate the new 2010 EPA-compliant engines, engineers reworked the after-treatment “muffler rack” and engine mounting designs. The after-treatment system — DPF, SCR and decomposition chamber — is now secured to the truck frame to virtually eliminate vibration transfer from the engine for longer service life.

A new combo engine/transmission arrangement on the new FD4000 eliminates a previous rear transmission mount, reducing the number of parts to maintain. Both the engine and transmission can be removed independently of each other to simplify servicing.

Inside the cab, the instrument panel includes a separate fuel-type gauge for the DEF tank and a multi-stage visual and audio DEF level warning system. Upon shutting down the truck, the DEF system features a 60-second reversing cycle to purge the lines of fluid.

For more information, visit terex.com.

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