What a construction-site dumper is: A mobile machine used mainly for internal transport of materials on construction and maintenance works (also, to a lesser extent, in gardening and forestry). In this manual, “site dumper” refers to units with a front box/hopper, usually without a cab, and a nominal load that rarely exceeds 10 tonnes—most commonly up to 4 tonnes. 

Manual objectives (scope you’ll be examined on):

1. Describe the characteristics and versions of dumpers; 2) lay out selection criteria according to the needs of each workplace; 3) specify the operator’s training level; 4) identify risks; 5) list preventive/protective measures; 6) note conditions for occasional use on public roads; 7) reference the applicable legal/regulatory texts. 

How to think about selecting the “right” dumper: Match the machine to the job and site constraints the manual emphasizes—e.g., whether you need rigid vs. articulated steering, a rotating hopper for side dumping, self-loading capability, or high-discharge for elevated dumping points. Those variants are defined in Module II and are the building blocks of sound selection.

Core machine types:
Dumper (motor dump): self-propelled on wheels or tracks with an open box to transport, tip, or spread materials. Rigid dumper: rigid frame; wheel steering. Articulated dumper: steering via articulated frames. Compact dumper: rigid or articulated, working mass ≤ 4,500 kg. Rotating dumper: hopper rotates ~180° for side dumping. Self-loading equipment: permanently mounted structure + bucket to load its own box. High-discharge dumper: unloads at various heights. 

Key safety/technical terms:
Rated load: manufacturer’s max permissible load. ROPS (Roll-Over Protective Structure): structural system to reduce crushing risk in a rollover. Operator restraint system: keeps the operator safely in position during a rollover (e.g., seat belt). Operator (legal sense): RD 1644/2008 defines the driver of mobile-risk machinery as the person responsible for moving the machine; RD 1215/1997 defines the operator as the worker responsible for the use of work equipment (start/stop, transport, maintenance, cleaning, etc.).

Placing on the market / putting into service (EU): Site dumpers must comply with the Machinery Directive 2006/42/EC (transposed in Spain by RD 1644/2008; older machines: RD 1435/1992). Compliance requires an EC Declaration of Conformity, visible CE marking, and an Instruction Manual at least in Spanish. Harmonized standards give “presumption of conformity,” notably EN 474-1 (general) and EN 474-6 (dumpers), and ISO 3471 (ROPS) / ISO 3449 (FOPS).

Use phase (in the workplace): RD 1215/1997 applies—equipment must meet Annex I minimum provisions and be used per Annex II; the INSST (formerly INSHT) Technical Guide is referenced for interpretation. For outdoor operation, RD 212/2002 requires a visible label stating the guaranteed environmental sound level. 

Circulation on public roads: If a dumper must travel on public (or deemed-public) roads, it must comply with current Traffic and Road Safety legislation.

Typical hazards covered by the manual: rollovers; run-overs/crush and trapping; falling objects and/or load; fire/explosion; slips/falls when mounting/dismounting; whole-body vibration; noise. 

Illustrative controls you’re expected to know:

• Rollover: Fit ROPS and use the seat belt; reduce speed—do not exceed ~10 km/h; check ground resistance; avoid edges/slopes and heavy braking on ramps. 

• Slopes: Descend >10% slopes in reverse with load facing the most stable direction; as a rule of thumb, avoid >20% on wet ground or >30% on dry ground. 

• Visibility & loading: Don’t overload; maintain clear sight; never travel with the hopper raised; if self-loading, position the shovel to maintain visibility. 

• Dumping near edges: Use a wheel stop at a safe distance; height ≥ one-third of wheel diameter.

Operator training: Required by RD 1215/1997 (linked to Article 19 of the LPRL). In construction, RD 1627/1997 and the Fifth General Construction Convention set a minimum of 20 hours and specify the syllabus (machine types, risk ID, preventive techniques, signaling, interferences, etc.). Training must be job-specific, adapted to the worker’s experience, updated when risks/equipment change, and repeated if necessary.

Maintenance: RD 1215/1997 Article 3 mandates keeping equipment safe through appropriate maintenance per the manufacturer and the equipment’s use/conditions. The manual recommends systematic preventive programs, qualified personnel, and keeping a maintenance log/diary plus daily inspection checklists to document checks throughout the equipment’s life.

Using the dumper (good practice highlights): Assess the work environment (explosion risk/ventilation indoors; need for FOPS per ISO 3449; ROPS per ISO 3471 as referenced in EN 474-1/-6). Follow driving rules (report anomalies; keep body within the operator’s compartment; manage slopes and visibility; never travel with hopper raised) and safe loading/unloading procedures. Apply PPE per the risk assessment (safety boots, helmet, high-visibility, gloves, hearing/eye protection).