Quel est le pas de chaîne d'une presse à balles rondes ? Guide pratique de référence

par | 2 juillet 2026 | Pignon

Connaissances agricoles|Société en commandite PRR Tractor Part|7 min de lecture

Quel est le pas de chaîne d'une presse à balles rondes ? Guide pratique de référence

Round balers use multiple chain drives simultaneously — the pickup drive, the rotor or feed roller drive, the bale chamber roller drive, and the net or twine wrap drive may each use a different chain pitch. Knowing which pitch each drive uses is essential when ordering replacement chains, as fitting the wrong pitch produces immediate disengagement or accelerated wear. The chain pitch used in each drive position is determined by the torque and speed requirements of that specific function, not by a single standard across the entire machine.

This guide covers the chain pitches used in the main baler drive positions, how to identify the pitch on a chain already fitted to your baler without a parts manual, and what to check when replacing baler chains to ensure the new chain matches the original specification.

round baler chain pitch identification replacement sprocket agricultural

Round balers use different chain pitches in each drive position — identifying the correct pitch before ordering prevents costly mismatches and avoids downtime during harvest.

Common Chain Pitches in Round Baler Drive Systems

Position de conduite Common Chain Pitch ANSI Designation Notes
Main PTO input to flywheel 38.1 mm (1.5″) #120 or #140 Heavy-duty, high torque
Pickup reel drive 19.05 mm (3/4″) #60 Lower torque, moderate speed
Bale chamber roller drive 25.4 mm (1″) #80 Medium torque, standard agricultural
Net wrap / twine drive 12.7 mm (1/2″) #40 Light duty, intermittent use
Feed rotor / pre-cutting 25.4 mm (1″) #80 High shock load capacity needed

These are the most commonly encountered pitches across major baler brands. Specific models may differ — always confirm against your parts manual or by measuring the chain on the machine before ordering.

How to Identify Chain Pitch on a Fitted Chain

If you do not have a parts manual and need to identify the pitch of a chain already fitted to your baler, the measurement is straightforward. Use a digital caliper to measure from the centre of one pin to the centre of the next pin — this is the pitch. For improved accuracy, measure across 10 links and divide by 10. The result should match one of the standard ANSI pitches: 9.525 mm (#35), 12.7 mm (#40), 15.875 mm (#50), 19.05 mm (#60), 25.4 mm (#80), 31.75 mm (#100), 38.1 mm (#120). If your measured value is very close to one of these but not exact, the chain is worn and the nominal pitch should be used for ordering — do not order based on the measured elongated pitch.

What Else to Check When Replacing Baler Chains

When replacing a baler chain, always inspect the sprockets at both ends of the replaced chain at the same time. Baler applications involve high cyclic loading and significant shock loading from slug feeding — sprocket wear progresses quickly relative to chain wear in these conditions. A new chain fitted to worn sprockets will elongate to the worn sprocket’s effective pitch within a short operating period and will disengage or require early replacement. Replace sprockets when tooth profile shows visible asymmetry or hooking.

For replacement agricultural sprockets in standard pitches, browse our catalogue de pignons agricoles. Contact [email protected] with your chain pitch, sprocket tooth count, and bore dimensions for a confirmed replacement set.

Baler Sprockets and Chain Drive Components

PRR Tractor Part stocks agricultural sprockets in ANSI #40 through #120 pitches for baler and harvesting equipment chain drives. Provide pitch, tooth count, and bore for a confirmed replacement.

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Foire aux questions

Can I use an ISO metric chain instead of ANSI chain on a baler?+
ANSI and ISO chains with the same pitch are dimensionally compatible in pitch and roller diameter in most cases, but differ in inner plate height, outer plate height, and pin diameter. While interchangeable in many cases, confirm that the ISO chain’s rated working load meets or exceeds the ANSI chain’s rated load for your application before substituting. For baler main drive chains carrying high shock loads, use only chains with a working load rating that exceeds your application’s calculated load with adequate safety factor.
How often should baler chains be replaced?+
Baler chains in the main drive positions should be checked for elongation at the start of each season and replaced when elongation exceeds 3% of the nominal pitch length over 30 links. For a #80 chain (25.4 mm pitch), 30 links nominal = 762 mm; replace at 785 mm or above. Light-duty chains in the wrap system may last several seasons if the baler has relatively low annual use — inspect rather than replacing on a fixed schedule, and replace based on measured elongation rather than calendar time.
Where can I buy sprockets for baler chain drives in common pitches?+
PRR Tractor Part Limited Partnership stocks agricultural sprockets in ANSI #40, #50, #60, #80, #100, and #120 pitches for baler and harvesting machine chain drives. Contact [email protected] with your pitch, tooth count, bore diameter, hub length, and keyway specification. Browse available options at our catalogue de pignons agricoles.

Baler Sprockets — ANSI #40 to #120 in Stock

Standard tooth counts, custom bore and hub options — provide pitch, tooth count, and bore for a confirmed replacement set before harvest season.

PRR Tractor Part Limited Partnership | [email protected]
304/1170 Soi Phahonyothin 49/1, intersection 6, sous-district de Talat Bang Khen, district de Lak Si