ISO/TR 18792:2008 PDF

Overview

ISO/TR 18792:2008 - Lubrication of industrial gear drives - is a technical report providing current technical information and guidance for the lubrication of industrial gearboxes up to a pitch line velocity of 30 m/s. It is an informative (non‑normative) source intended for gear manufacturers, gearbox users, maintenance and service personnel, and lubricant manufacturers/distributors. The report focuses on lubricant types, selection principles, lubrication systems and service practices for a wide range of gear types (excluding automotive transmissions).

Key Topics

ISO/TR 18792:2008 covers practical and technical aspects of gear lubrication, including:

• Basics and failure modes
  • Tribo‑technical parameters of gears and how lubrication affects wear, scuffing, micropitting and pitting.
• Lubricant composition
  • Base fluids, thickeners, additives and solid lubricants; how chemical properties influence protection and life.
• Friction, temperature and film formation
  • Effects of operating temperature, shear and lubricant film on gear performance.
• Lubrication regimes and methods
  • Splash (immersion), transfer, spray, oil‑stream, oil‑mist, brush and centralized systems; guidance for open gearing vs enclosed gear units.
• Viscosity selection
  • Practical tables and guidelines for selecting lubricant viscosity (parallel, bevel - not hypoid - worm and girth gears), with ISO viscosity grade guidance at operating temperatures.
• Test methods and condition monitoring
  • Gear test methods, functional lubricant tests and recommendations for oil sampling and on‑line monitoring.
• Gearbox service and maintenance
  • Initial fill and change intervals, best practices for lubricant change, sample analysis and fault diagnosis.

Applications

This Technical Report is used to:

• Select appropriate gear oils, greases and lubricating compounds for new gearbox designs and retrofits.
• Define lubrication system type (splash, circulation, spray, mist) based on pitch line velocity, gear type and duty cycle.
• Develop maintenance schedules: initial fill procedures, oil change intervals and oil‑condition monitoring programs.
• Support gearbox troubleshooting by linking lubricant properties and operating conditions to failure modes.
• Inform lubricant manufacturers and distributors about industry needs for additive packages and base fluid performance.

Who benefits:

• Gearbox designers and gear manufacturers
• Industrial maintenance teams and reliability engineers
• Lubricant formulators and suppliers
• Plant managers in mining, cement, steel, power generation and other heavy industries

Related Standards

ISO/TR 18792:2008 was prepared by ISO/TC 60 (Gears) and complements other ISO gear and lubrication standards (refer to ISO technical committee publications for related normative standards and test methods).