Editorial Technical Reference

Dump Body

This page explains how Dump Body is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The main cargo-carrying container of a dump truck that tilts to unload materials.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Dump Body

Definition
The dump body is the primary structural component of a dump truck, designed as a large, open-topped container mounted on the chassis. Its core function is to transport and contain bulk materials such as sand, gravel, dirt, or demolition debris. It is hydraulically actuated to lift at its front end, allowing the cargo to slide out from the rear when the truck is in the dumping position. Constructed from high-strength steel, the dump body is engineered to withstand heavy loads and abrasive materials. Typical payload capacities range from 20 to 50 tonnes, with body volumes between 15 and 30 cubic meters. Floor thickness is usually 8 to 12 mm, while side walls are thinner at 6 to 8 mm, often reinforced with ribs. Material grades commonly used are Q345B to Q550D per GB/T 1591, offering higher yield strength for weight reduction. The tipping angle, typically 45 to 55 degrees, must exceed the material's repose angle to ensure full discharge. Operating temperatures range from -40°C to 85°C, affecting steel toughness and hydraulic fluid viscosity. Maximum hydraulic pressure is 16 to 25 MPa, determining hoist cylinder size and pump rating. Empty weight ranges from 3 to 8 tonnes, influencing payload-to-weight ratio and fuel economy. Overall dimensions vary, with lengths from 5000 to 8000 mm, while width and height depend on the chassis. These values are directory reference ranges and must be confirmed for the specific model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The dump body is hinged at its rear to the truck's subframe. A hydraulic cylinder, typically mounted between the chassis and the front of the body, extends to push the front of the body upward. This creates a tilting angle, utilizing gravity to cause the loose material inside to slide out through the rear opening or tailgate. The hydraulic system operates within a pressure range of 16 to 25 MPa, and the tipping angle is typically set between 45 and 55 degrees to ensure complete discharge. The rear hinge and hydraulic cylinder must be properly maintained to ensure safe and efficient operation.
Common Materials
High-strength steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Payload Capacity20–50 tDetermines truck class and chassis requirement.
Body Volume15–30 Heaped volume; affects load density and material type.
Floor Thickness8–12 mmThicker floor for abrasive materials like rock.
Side Wall Thickness6–8 mmThinner than floor; can be reinforced with ribs.
Material GradeQ345B–Q550DHigher yield strength for weight reduction.GB/T 1591
Tipping Angle45–55 °Must exceed material repose angle for full discharge.
Operating Temperature-40–85 °CAffects steel toughness and hydraulic fluid viscosity.
Max Hydraulic Pressure16–25 MPaDetermines hoist cylinder size and pump rating.
Empty Weight3–8 tAffects payload-to-weight ratio and fuel economy.
Overall Dimensions5000–8000 mmLength; width and height vary with chassis.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Floor Part
    Forms the base of the container, directly supporting the load. Often reinforced and sloped to aid material flow during dumping.
    Material: High-strength steel plate
  • Side Walls Part
    Contain the material during transport. May include top rails for structural rigidity.
    Material: High-strength steel plate
  • Headboard Part
    The front wall of the body, which bears significant stress during the lifting cycle.
    Material: High-strength steel plate
  • Tailgate
    The rear gate that secures the load during transport and opens (manually or hydraulically) for dumping. Can be a simple hinged gate or a more complex barn-door style.
    Material: High-strength steel plate
  • Hinge Pins & Brackets Part
    Provide the pivotal connection between the dump body and the truck's subframe at the rear, allowing the body to tilt.
    Material: Forged steel
  • Hoist Cylinder Mounting Brackets Part
    Reinforced structures on the body's subframe or headboard where the hydraulic hoist cylinder is attached.
    Material: High-strength steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Dump Body.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (structural load-bearing, not pressurized)
other spec: Payload capacity: 5-50 tons typical, Tilt angle: 45-70°, Material thickness: 4-12 mm steel
temperature: -40°C to 80°C (operational range for standard steel bodies)
Media Compatibility
✓ Aggregates (gravel, sand) ✓ Construction debris ✓ Agricultural materials (grain, soil)
Unsuitable: Corrosive chemicals or highly abrasive slurries without specialized lining
Sizing Data Required
  • Payload capacity (tons)
  • Truck chassis dimensions and GVWR
  • Primary material type and density

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Abrasive erosion
Cause: Continuous exposure to abrasive materials (e.g., rocks, sand, ore) during loading/unloading cycles, leading to thinning and perforation of steel plates, especially at impact zones and corners.
Fatigue cracking
Cause: Cyclic stress from repeated dumping/loading operations, exacerbated by structural overloading, poor weld quality, or stress concentrations at hinge points and reinforcement joints, causing cracks to propagate over time.
Maintenance Indicators
  • Visible cracks or deformation at hinge mounts, sidewalls, or floor plates, indicating structural fatigue.
  • Unusual grinding or scraping noises during dumping, suggesting misalignment, worn bushings, or debris trapped in mechanisms.
Engineering Tips
  • Implement a regular liner inspection and replacement program for high-wear areas (e.g., floor and impact zones) using abrasion-resistant steel or composite overlays to reduce erosion.
  • Enforce strict load limits and balanced loading practices to minimize uneven stress, and conduct periodic non-destructive testing (e.g., ultrasonic or dye penetrant) on welds and critical joints to detect early cracks.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A48/A48M-19 Standard Specification for Gray Iron Castings

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.05mm
  • Surface Flatness: 0.15mm per 300mm
Quality Inspection
  • Dimensional Verification with CMM
  • Magnetic Particle Inspection

Manufacturers of Dump Body

Manufacturer profiles associated with Dump Body.

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Frequently Asked Questions

What materials are dump bodies typically made of?

Dump bodies are commonly made of high-strength steel, with material grades such as Q345B to Q550D per GB/T 1591. The floor is thicker (8-12 mm) to resist abrasion, while side walls are thinner (6-8 mm) and may be reinforced with ribs.

How does the dumping mechanism work?

The dump body is hinged at the rear. A hydraulic cylinder pushes the front upward, creating a tilting angle (typically 45-55 degrees) that allows material to slide out by gravity. The hydraulic system operates at pressures of 16-25 MPa.

What is the typical payload capacity of a dump body?

Payload capacity typically ranges from 20 to 50 tonnes, depending on the truck class and chassis. The body volume is usually 15 to 30 cubic meters, and the empty weight is 3 to 8 tonnes.

What factors affect the selection of a dump body?

Key factors include payload capacity, body volume, material type (abrasiveness), operating temperature, and hydraulic pressure. The tipping angle must exceed the material's repose angle for full discharge. Always verify specifications with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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