Terex CR662RM’s Design Enhancements Increase Production

Mon November 23, 2009 - National Edition
Construction Equipment Guide

Terex’s CR662RM RoadMix material transfer vehicle and paver features a variable-pitch in-hopper auger design.
Terex’s CR662RM RoadMix material transfer vehicle and paver features a variable-pitch in-hopper auger design.

Terex’s CR662RM RoadMix material transfer vehicle and paver features a variable-pitch in-hopper auger design that increases material throughput. Pitch spacing — transitioning from 10 in. (25.4 cm) in the front to 11 in. (27.9 cm) and then to 12 in. (30.5 cm) in the rear — aggressively channels material to the rear of the machine for faster truck unloading. This auger design helps boost production capabilities, which can exceed 500 tons per hour (454 t per hour). Even with the aggressive pitch, the auger’s constant-diameter continues to reblend 100 percent of the material to combat both material and thermal segregation, according to the manufacturer.

The CR662RM’s conveyor assembly features a stationary lift conveyor with flights averaging every other pitch to reduce hydraulic pressure and quickly channel material from the rear of the tractor to the swiveling conveyor. Hydraulic pressure gauges for the conveyors, mounted at the operator’s station, help to minimize the chance of plugging the system. Hydraulically operated clean-out doors and reversible conveyor flights help to clear obstructions.

The RoadMix increases machine utilization rates, since it works equally as well as a Remix Anti-Segregation System paver, according to the manufacturers.

The variable-pitch, in-hopper auger design enables the CR662RM to match or better production rates of conventional slat pavers, while giving the additional benefit of virtually eliminating segregation.

When equipped as a paver, the Terex CR662RM incorporates two, 5-ft. (1.5 m) long spread auger sections to deliver material to the left- and right-hand sides of the screed. The auger design employs two independently controlled, variable-speed outboard drive motors, which are mounted to the tractor’s rear bulkhead. This eliminates the center gearbox drive and, since the left- and right-hand auger sections back up to each other, reduces the occurrences of centerline segregation.

Contractors can choose from three different screed models — the diesel or electric Fastach 10, electric VersaScreed, and the electric or diesel Stretch 20 — to convert the Terex CR662RM into a paver. Depending on the screed model, this 10-ft. (3 m) paver delivers mainline paving widths reaching 30 ft. (9.1 m) at depths of up to 12 in. (30.5 cm).

When the contractor needs a transfer vehicle, the screed and spread augers are quickly removed from the tractor and replaced by the conveyor assembly. The RoadMix MTV delivers continuous, non-contact and off-set paving capabilities. Asphalt is immediately channeled from the receiving hopper to the rear of the machine, providing reduced handling time and virtually eliminating the temperature loss common with other MTV designs. Material passes through the stationary 37-in. (94 cm) wide lift conveyor to a 30-in. (76.2 cm) wide swivel conveyor. This second conveyor swings 55 degrees to the left or right of center and offers a hydraulically variable discharge height from 73 to 116 in. (185.9 to 294.2 cm).

Whether equipped as a paver or an MTV, the CR662RM features the Terex Smartrac rubber track drive system for more reliable operation. Oscillating bogie wheel assemblies combine with the system’s frictionally driven rubber tracks to automatically apply the correct tension, whether in forward or reverse. The self-tensioning system does not over tension the track, significantly extending track life, according to the manufacturers.

The rubber track drive spreads the machine’s 54,000 lb. (24,495 kg) over a larger area, resulting in a low ground contact pressure of less than 12 psi. This eliminates the parking and bridge-crossing issues common with conventional wheel-driven transfer vehicles.

The Terex Cedarapids CR662RM features the latest in emissions control technology to meet stringent Tier III and Stage IIIA standards. The powerful diesel engine develops 260 hp (191 kW). A single-width, triple-element radiator efficiently cools engine water, charge air and hydraulic oil.