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Toppling of Dumper

Toppling of Dumper

Dumping is one of the important activity in our construction industry. As end-dump truck bodies gets longer, the incidents increases. For this reason, in this alert we will highlight some common causes of dump truck toppling accidents to help you avoid causing injury during operation.

Toppling of Dumper
The main hazard is related to the stability of the end-dump unit when the box is in the raised position. When the center of gravity of the box and load is not roughly between the frame rails of the unit, there is a risk of tip-over.
Factors that can adversely affect stability of dumper:
·         The unit is not on a level surface when dumping.
·           A large amount of material is in the upper portion of the raised box.
·           Material does not flow out of the top portion of the box, or does not flow out of one side of the top portion;
·         The rear wheels settle unevenly as the load moves to the rear during dumping;
·         Wind may exert lateral loads, especially if the box is long, as is the case with end-dump semi-trailers.
·         Poor rear suspension systems on one side of the vehicle;
·         Uneven tire pressures in rear wheels;
·         Worn or inadequate components of the lifting system such as pins;
·         Worn or inadequate lifting cylinders.

Dumping Safety precautions:

·         Operators should be trained to recognize areas hazardous to dumping, such as soft or uneven surfaces and inadequately compacted fill.
                  ·         Dumping to be allowed only after the ground surface is inspected by the operator.
·         Before dumping, operators should ensure that the tailgate is unlocked and that the vehicle is on a reasonably level surface. Dumping on surfaces that are not level is one of the main causes of tip-overs.
                  ·         Before spreading material by dumping it from a moving truck, make sure that the entire length of travel is reasonably level.
                  ·         Other personnel such as dozer operators, surveyors, and spotters should be warned not to work near a dumping truck in case it tips over.
                  ·         Workers should not congregate in areas where dumping is under way.
·         Check tire pressures daily. Tire pressures should be equal on each side of the vehicle, according to manufactures’ recommendations.
                  ·         Examine and lubricate pins and bushings regularly.
·         Inspect suspension systems under load to ensure that they work properly. Weak suspension systems should be replaced immediately.
                  ·         Inspect hoist cylinders regularly. Worn cylinders should not be replaced with smaller cylinders or with cylinders rated at lower operating pressure.
                  ·         Make sure that repairs to boxes leave bottom and sides clear and unrestricted. Rough patchwork repairs near the top of the box can catch and hold sticky materials.

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