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A customer using a 4-ton dump truck consulted us, saying, “The Kobore-n sheet (= sideboard sheet) is torn, and I am concerned about the load spilling,” and “The top edge of the frame is deformed, making it difficult to stretch the sheet.” The sheet had been torn by wind pressure during continuous operation at a quarry, and the frame had also bent, making opening and closing heavy. They requested our services, stating, “When I asked for another repair previously, your attentive service and finish were excellent.”

[Repair Details and Key Points]

• Frame repair (cutting top and bottom → round steel pipe welding → painting)
  • Cut the distorted upper and lower frames and weld a steel round pipe along the full length.
  • Apply surfacer plus a topcoat in an OEM-like white to prevent rust and color unevenness.
• Kobore-n sheet replacement (one side)
  • Use a heavy-duty green sheet.
• Finishing and testing
  • Confirmed no binding or slack through a 20-cycle continuous open/close test.
  Our strengths and innovations
  • On-site work with our service vehicle equipped with a mobile welder and heavy-duty sewing machine → Minimizes downtime
  • Upgraded to a “frame that is less likely to bend” with round-pipe reinforcement → Significantly reduces the risk of recurrence

[For Those with Similar Concerns]

If you are experiencing issues such as, “The Kobore-n sheet on my 4-ton dump truck has started to tear…” or “The frame on my 10-ton dump truck is warped and the sheet is getting caught…,” we recommend an early inspection and repair.

In addition, a torn Kobore-n sheet poses a risk of the load falling or scattering and may cause trouble for others, such as while driving, so we particularly recommend replacing it as soon as possible.

We can assist at any time, including with estimates, so please feel free to contact us.
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