ISO 5673-2:2005

Overview

ISO 5673-2:2005 - "Agricultural tractors and machinery - Power take-off drive shafts and power-input connection - Part 2" specifies the forms and use of PTO (power take-off) drive shafts and the positioning and clearance of the implement power-input connection (PIC) for a range of agricultural attachments. The standard ensures safe and compatible spacing between the tractor PTO drive line and adjacent components on implements when tractor and implement power levels match. It is a technical specification focused on geometry and clearance; it is not a complete drive-line design guide and does not address vibration prevention or torque-limiting device sizing.

Key topics and requirements

• PTO drive shaft forms: Defines three forms of PTO shafts - Form A (two universal joints), Form B (one wide-angle CV joint + one universal joint) and Form C (two wide-angle CV joints) - and describes their intended compensation for angle and length variations.
• Shaft length and alignment: Requirements for selecting shaft length to accommodate maximum extended and minimum closed positions; guidance on equal-angle hitch geometry to maintain uniform rotation.
• PIC position and clearance envelopes: Detailed horizontal and vertical spacing, and minimum clearance zones around the implement PIC for attachment types such as:
  • Drawbar attachment
  • Three‑point linkage
  • Hitch hook / piton-fix / ball-type coupling
  • Clevis-type attachment
• Dimension tables & figures: The document includes Figures 1–11 and Tables 1–8 giving the specific clearance envelopes, distances and angle limits for different hitch categories and power ranges.
• Limitations: Not applicable to high-ground-clearance tractors (e.g., sugarcane/standing vegetable crops), low-ground-clearance tractors (lawn/ground-care designs), or necessarily asymmetric implements required by function.

Applications

• Ensures safe PTO shaft clearance and PIC placement during design and manufacture of tractors and implements.
• Used to reduce risk of interference between PTO driveline and adjacent equipment during operation and maneuvering.
• Helps compatibility verification when matching implements to tractors of specific power categories.
• Supports documentation for product safety, CE/market conformity and technical drawings for implement attachment points.

Who should use this standard

• Tractor and implement design engineers
• Agricultural machinery manufacturers
• Product safety engineers, compliance officers and test laboratories
• Agricultural equipment distributors and technical document writers specifying PTO/PIC geometry

Related standards

• ISO 5673-1 (general manufacturing and safety requirements)
• ISO 500-3 (rear-mounted PTO dimensions and spline/location)
• ISO 730-1 (three-point linkage dimensions)
• ISO 6489 series and ISO 24347 (hitch and coupling dimensions)

Keywords: ISO 5673-2, PTO drive shafts, power-input connection, PIC clearance, agricultural tractors, PTO shaft dimensions, three-point linkage, drawbar attachment.