The dump body of a mining haul truck is subjected to severe impact and wear during every loading cycle. Rocks, ore, and overburden strike the steel body day after day. Without proper maintenance, the body floor can wear through or develop cracks, resulting in material spillage or even the entire truck being scrapped due to structural failure. Here are four ways to extend the service life of a mining truck dump body:

1. Regularly inspect liner thickness

Wear-resistant liners are replaceable steel plates bolted or welded to the dump body floor and side walls. They absorb most of the wear, thereby protecting the main structure of the dump body. Inspect the liners monthly, using a simple punch-type thickness gauge or an ultrasonic thickness gauge to measure the remaining thickness. Replace liners when they wear down to 10 mm or less (or reach the minimum limit specified by the manufacturer). Continuing to use severely worn liners will damage the floor itself—and replacing the floor costs ten times more than replacing the liners.

2. Watch for cracks at stress concentration points

Cracks typically start at areas of stress concentration. Common locations include:

Corner joints between the floor and side walls

The hinge area where the dump body pivots

The upper edges, which experience the greatest impact forces

When small cracks are found, grind them out immediately and weld them using suitable welding electrodes—never simply overlay a weld bead on the surface. For cracks longer than 100 mm, drill a crack-arrest hole at each end before welding. After repair, weld reinforcing strips in the affected area to prevent the cracks from recurring.

3. Maintain a material “cushion layer”

A bare steel dump body is highly susceptible to wear. During loading, retaining a small amount of material in the body as a cushion layer can protect the floor from impact. Loader operators should be trained to leave a 100–200 mm layer of fine material at the bottom of the dump body. Where conditions permit, avoid completely emptying the dump body. This residual material acts as a shock-absorbing cushion. Mines that adopt this practice can typically double the service life of their dump body floors.

4. Inspect tailgate hinges and latches

A loose tailgate can drag on the ground during unloading, causing wear along the edge of the floor. During transport, it can also move back and forth, transmitting impact loads to the dump body structure. Check the hinge pins for wear—if lifting the tailgate reveals noticeable play, replace the bushings or pins. Ensure that the latches close securely. If the tailgate bounces while driving, it places unnecessary stress on the entire dump body structure.

Quick field check: After unloading, inspect the condition of the dump body floor. If you notice bright metal with streaks aligned with the direction of material flow, the liners are becoming thinner. Mark the area with paint and measure its thickness weekly. Also, listen for a hollow sound when tapping the body floor—a hollow sound indicates that the steel plate has become thin.

Do you need a mining truck dump body inspection guide tailored to your job site? Please reply with your truck model and liner type, and we will send you a PDF containing wear limit charts, welding repair procedures, and a monthly inspection record form.