ISO/DIS 8909-1

DRAFT INTERNATIONAL STANDARD
ISO/DIS 8909-1
ISO/TC 23/SC 7 Secretariat: UNI
Voting begins on: Voting terminates on:
2019-12-31 2020-03-24
Equipment for harvesting — Forage harvesters —
Part 1:
Vocabulary
Partie 1: Vocabulaire
ICS: 65.060.50; 01.040.65
THIS DOCUMENT IS A DRAFT CIRCULATED
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This document is circulated as received from the committee secretariat.
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 8909-1:2019(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
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ISO/DIS 8909-1:2019(E)
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Foreword ......................................................................................................................................................................... iv

Introduction ..................................................................................................................................................................... v

1 Scope .................................................................................................................................................................... 1

2 Normative references .................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................... 1

4 Terms for characteristics of functional components .......................................................................... 2

5 Terms for machine and functional component characteristics ...................................................... 5

6 Crop terminology .......................................................................................................................................... 13

7 Performance terms ...................................................................................................................................... 13

Bibliography ................................................................................................................................................................. 15

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This document was prepared by ISO/Technical Committee TC 23, Tractors and machinery for

agriculture and forestry, Subcommittee SC 7, Equipment for harvesting and conservation.

This second edition cancels and replaces the first edition (ISO 8909-1:1994), which has been technically

Any feedback or questions on this document should be directed to the user’s national standards body. A

This document specifies terms and definitions relating to forage harvesters and their component parts.

In association with ISO 8909-2, which lays down methods of measuring characteristics and

performance requirements for the term defined, this document identifies dimensions and other

characteristics aimed at allowing comparison of operations of the machines and to improve

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 789-3:2015, Agricultural tractors — Test procedures — Part 3: Turning and clearance diameters

ISO 2710-1:2000, Reciprocating internal combustion engines — Vocabulary — Part 1: Terms for engine

ISO 8909-2:XXXX, Equipment for harvesting — Forage harvesters — Part 2: Specification of

ISO 14396:2002, Reciprocating internal combustion engines — Determination and method for the

measurement of engine power — Additional requirements for exhaust emission tests in accordance with

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

For the purposes of this document, the terms and definitions in this document apply.

agricultural machine used to harvest or gather the crop, cut the crop into short parallel lengths and to

Note 1 to entry Typical forage crops harvested are grasses, legumes, mixtures and/or row crops such as maize

(corn) and sorghum. The chopped crop may be preserved in storage by ensiling or dehydrating, or it may be fed

Note 2 to entry The forage harvester may harvest the crop directly by cutting it at full width or from single or

multiple rows, or by picking it up from swaths or windrows. Forage harvesters may be tractor-mounted, towed or

forage harvester (3.1) which uses a feeding mechanism consisting of four or more feed rolls to partially

orient and advance the crop at a consistent rate into the cutting or shearing mechanism

Note 1 to entry This type of forage harvester is capable of producing the shortest and most uniformly cut

forage harvester (3.1) which uses a feeding mechanism consisting of fewer than four feed rolls or other

Note 1 to entry Mean particle lengths and particle uniformity are intermediate between those obtained with

precision-cut and random-cut forage harvesters. This type of forage harvester includes double-chop and multi-

forage harvester (3.1) without a distinct feeding mechanism usually employing flails to impact-cut and

Note 1 to entry This type of forage harvester usually produces the longest mean particle lengths, and the least

device, usually detachable, used to gather the crop into the forage harvester (3.1)

device capable of cutting unharvested crop across its full width and conveying the cut crop directly into

cutting device which uses one or two reciprocating components (sickle, knife) to cut off the standing

rotary cutting device using high-velocity knives driven about a vertical or horizontal axis to cut off the

multiple disc mechanism using two or more blades per disc driven about vertical axes from below at

device using multiple large discs each with a central drum and driven about vertical axes from above or

Note 1 to entry Each disc has at least two knife blades which protrude outwards from beneath the peripheral

device using multiple, radially attached blades that are mounted to pivot on a horizontal rotor

Note 1 to entry Each blade has a transverse cutting edge to cut off crop by impact.

Note 1 to entry There are two systems: the one-disc rotary knife system requires a stationary knife against

which to shear the crop, and the two-disc rotary knife system requires either a stationary knife or discs that are

overlapped and rotated in opposite directions such that the crop is sheared off at the forward intersection of the

device consisting of one pivoting knife with two cutting surfaces per row crop head row unit

Note 1 to entry The knife reciprocates in a semi-circular arc and cuts the crop off against one of two stationary

device for cutting off stalks comprising a horizontally arranged chain or belt carrying protrusions which

one or more cylindrical rolls, generally with protrusions or flutes, used to gather, compress and advance

devices intended to cut the crop into short lengths with reasonable consistency within a range of

knives on cylindrical mountings such that the cutting edges of the knives are essentially parallel to the

knives mounted essentially radially with the cutting edges describing a plane perpendicular to the axis

fixed plate providing a stationary edge against which the cutterhead knives shear the crop

semi-cylindrical band or plate with holes mounted concentric to a cylinder cutterhead (4.4.1), which

starts downstream of the stationary knife (4.5) and continues around the discharge opening

Note 1 to entry The chopped crop is recut by the cutterhead knives as it passes through the screen holes.

Note 2 to entry The recutter screen is used primarily to reduce particle lengths tha