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GOMACO Introduces Three-Track GT-3400

Fri February 27, 2009 - National Edition
Construction Equipment Guide

GOMACO’s GT-3400 three-track machine features the G21 controller, All-Track steering, high-speed track motors and the simultaneous trim/pour feature.

The GT-3400 is controlled by remote control. The remote control is lightweight, durable and gives the operator total freedom to move about the operation. It is 11 in. (27.9 cm) wide, 7 in. (17.8 cm) tall, 4.5 in. (11.4 cm) deep and weighs only 6.75 lbs. (3.1 kg).

All of the necessary functions, including vibrator adjustment and an emergency stop, are built into the remote’s small package. The remote control is powered by a nine volt, off-the-shelf Makita battery, which makes it easy to replace if necessary.

Built-in safety features stop the machine if the remote loses communication or if the remote control turns on its horizontal axis more than 60 degrees.

The wireless remote features “frequency hopping” capabilities. The remote is constantly changing channels and frequencies to maintain contact with the GT-3400.

The remote has the option of being tethered to the machine for areas that do not allow transmitting. For example, projects near airports and blasting operations restrict radio use. The contractor simply tethers the remote to the machine and the wireless transmitter is disabled.

The GT-3400 features an all-new three-track footprint with All-Track steering. The new footprint features two close tracks on one side and a single track on the other. The design was chosen for tight turning radius capabilities, getting on and off string line fast, and the design minimizes machine length.

With the front track positioned beside the mold and behind the trimmerhead, the GT-3400 is capable of slipforming right up to an object or to the end of the string line. The trimmerhead simply has to be side-shifted and lifted up out of the way allowing the machine to pave up to the end of the pass.

Many parking lot designs for curb and gutter have sharp angles, short runs, tight radii, and do not always take slipforming into consideration. The new GOMACO GT-3400 makes these kinds of jobs possible. Its compact size from front to back allows the machine to get into the small areas where one island ends and another begins.

The radial piston hydraulic motor directly drives the trimmerhead. The trimmer’s closed-loop hydraulic circuit and radial piston motor provide 28,684 in.-lbs. of torque at the trimmerhead. The 24-in. (61 cm) diameter trimmer is equipped with Kennametal teeth, and the trimmer’s width can be varied from 30 in. (76.2 cm) to 78 in. (198.1 cm).

The GT-3400 has a direct-drive, 14 in. (35.6 cm) diameter, charging auger to deliver concrete to the mold. The auger was chosen because it minimizes the overall length of the machine. The auger also hydraulically slides to help minimize the transport width. It slides down for hopper positioning and receiving concrete from the trucks and it slides up to reduce transport width.

Changing molds is quick and easy with the Hook-and-Go mold mount system. The operator simply has to drive the GT-3400 up to the mold, hook the mount to a special attachment plate on the mold and lower the hold-down. The operator then hydraulically lifts the mold and goes back to work slipforming the project.

The GT-3400 is powered by a 127 hp (94.7 kW) electronic-controlled Caterpillar diesel engine with a remote mounted cooling package. The engine, coupled with the hydraulic circuitry, results in a high fuel-efficient hp to work-performed ratio.

The cooling package fan is driven by a hydraulic motor, which allows the G21 controller to vary the fan speed to match the cooling demand. This results in less engine horsepower dedicated to the fan and a quieter operation.

The GOMACO G21 and “smart” cylinders provide simple push-button steering setup on the GT-3400. The cylinders are attached to a new style of leg.

GOMACO engineers have designed a new piston-style leg that acts like a cylinder. The legs have bearings on both ends of the inner tube so there is no steel-on-steel contact. A keyway is utilized for steering control and adjusting wear pads is a thing of the past with the new legs.

Two-speed track motors provide fast job-site mobility up to 125 ft. per minute (38 mpm).

The new GT-3400 has been designed to be a multi-application machine and will slipform right-side or left-side curb and gutter, tight radius, safety barrier, bridge parapet, sidewalk, recreational paths and flat slabs up to 6 ft. (1.8 m) wide.

Contractors can pave with either string line or go stringless. The G21 controls interface with stringless technology/3D control systems.

For more information, visit

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