Masonry Magazine September 2001 Page. 20
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The Differences in The Cut
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heights in excess of forty feet. When energized, these systems significantly increase telehandler stability as the boom is being raised and extended. Telehandlers not having this system, or if the system is not energized, operate within what is known as a three point stability triangle (similar to the machine having only one rear wheel located in the center of the rear axle). When a telehandler design incorporates a rear axle stabilization system it provides, when energized, a four point stability rectangle. This is accomplished by locking the frame to the rear axle through the stabilizer cylinder. The machine is then supported at four points. Which tips over easier: the triangle or the rectangle? Obviously the triangle tips easier. This feature is a must when operating on rough terrain and heights in excess of forty feet (an example is shown in the diagram below.)
When a telehandler's design incorporates a rear axle stabilization system and that system is energized, it provides a 4-point stability rectangle by positively locking the frame to the rear axle through the stabilizer cylinder. The vehicle is then supported at the four points of A, B, D and E. It is especially important that the vehicle not be driven with the rear axle locked. This illustration shows the increase in stability with a rear axle stabilization system.
VISIBILITY
The operator having a clear field of vision is tantamount to the safe operation of a telehandler. Weighing in excess of 20,000lb (typically) and having the ability to travel in excess of fifteen miles per hour, can make this a dangerous machine. The operator must be able to see everything in his path. Due to the basic design of "older" typical telehandlers, visibility obstructions normally occurred when the operator attempted to view the area to the right of the operator's compartment and to the rear of the machine. Within the past five years great strides have been made by the manufacturers in this area. The operator's view through the "blind spots" has been greatly increased, while the "blind spots" themselves have been greatly reduced. This is primarily due to changes in the boom placement and boom mounting design as well as engine placement. There is a lot of discussion among the manufacturers (as well as the end users) about "High Boom" vs. "Low Boom" design.
"Low Boom" design nestles the boom, when lowered, into the machine's main frame giving the operator full 360 degree visibility around the machine. There are however, two problems with this concept. In this position the forks are, for all practical purposes, flat on the ground, negating move- (more on page 22)
20 MASONRY SEPTEMBER, 2001