ISO 6746-1:2003

Overview

ISO 6746-1:2003 - "Earth-moving machinery - Definitions of dimensions and codes - Part 1: Base machine" standardizes how dimensions of earth‑moving base machines are defined, measured and coded. It specifies a three‑dimensional reference system (X, Y, Z zero planes and positive coordinate directions), a ground reference plane (GRP) for measurements, and a concise coding system that identifies dimension types. The standard applies to the basic types of earth‑moving machinery defined in ISO 6165 and supports consistent terminology and commercial specifications.

Key topics and technical requirements

• Three‑dimensional reference system: Defines zero X, Y, Z planes, positive coordinate directions (forward/right/up) and typical base points (e.g., SIP for a seat or crankshaft centreline) for repeatable measurement.
• Ground reference plane (GRP): Specifies the plane on which machines are placed for measurements (hard level surface for base machines).
• Coding system: Uses a single capital letter to indicate the type of dimension:
  • H = height (Annex A)
  • W = width (Annex B)
  • L = length (Annex C)
  • R = radius (Annex D)
  • A = angle (Annex E)
  • Numeric reference numbers are appended to letters to identify specific dimensions (e.g., H1, H2).
• Defined height dimensions (examples) from Annex A:
  • H1 - maximum height: Z distance from GRP to highest point with cab/ROPS.
  • H2 - maximum height without cab/ROPS.
  • H3 - shipping height: highest point after removal of parts normally removed for transport.
  • H4 - ground clearance: Z distance to central part of machine minus H5.
  • H5 - grouser height: Z distance between shoe face and tip of grouser.
• Normative references: ISO 6165 (machine type vocabulary) and related parts (ISO 6746‑2 covers equipment and attachments).

Practical applications

• Standardizes specification sheets, technical drawings and product data for earth‑moving base machines.
• Ensures consistent dimensional reporting across manufacturers, suppliers and rental fleets.
• Supports procurement, transport planning (shipping height), site clearance checks (maximum height, ground clearance) and safety assessments (ROPS clearance).
• Enables consistent CAD modelling, interchange of technical data, and comparison of machine dimensions in tender documents and commercial specifications.

Who should use ISO 6746-1

• OEMs and machine designers creating dimensional specifications and drawings
• Technical writers and standards authors preparing terminology and commercial specs
• Procurement, fleet managers and rental companies comparing equipment
• Transport planners and logistics teams assessing shipping dimensions
• Test labs, certification bodies and regulators verifying declared dimensions

Related standards

• ISO 6746-2 - Equipment and attachments (complements Part 1)
• ISO 6165 - Basic types - Vocabulary (machine type definitions)
• ISO 5353 - Seat index point (SIP) reference used for base points

Using ISO 6746-1 helps maintain clarity and interoperability in documentation, procurement and safety processes involving earth‑moving machinery dimensions and codes.