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Maintaining optimal performance of a combine header begins with ensuring that all moving parts, especially the chains, are in good working order. Corn header chains transfer power along the header platform, driving the gathering chains and snap rolls that channel corn stalks into the combine. Over time, wear, stretching, or damage can compromise chain integrity, leading to uneven feeding, slippage, or complete failure. This guide provides a step-by-step procedure for replacing corn header chains safely and effectively.
Gather Tools and Parts: Before beginning, assemble replacement chains specified for your header model, appropriate master links or connecting pins, a torque wrench, safety gloves, eye protection, and basic hand tools (wrenches, pliers, and screwdrivers).
Park and Secure Equipment: Position the combine on level ground, lower the header to the ground, shut off the engine, and remove the key. Engage wheel chocks to prevent movement.
Release Tension: Locate the chain tensioners on the header platform. Use the tensioner adjustment bolts or gas-spring release levers to relieve slack from the old chain.
Disconnect Master Link: Identify the master link or connecting pin and carefully release it using pliers or a punch tool. Keep track of any retaining clips for reuse.
Extract the Chain: With the tension released, pull the chain off the sprockets, rollers, and guides. Inspect the drive sprocket and idler gears for wear; replace any components that show significant damage.
Clean and Inspect: Wipe down the sprockets, roller shafts, and chain guides to remove debris, corrosion, and old lubricant. Inspect for bent guide bars or worn bearings that may hinder new chain performance.
Lay Out Chain: Before installation, straighten the new chain on a clean surface to remove kinks. Confirm the chain length matches the old chain; if necessary, adjust using the provided connecting pins.
Position on Sprockets: Starting at the drive sprocket, loop the chain over each sprocket and through guide slots, ensuring it seats fully on each tooth. Maintain the proper routing path, as indicated in the header’s service manual.
Reconnect Master Link: Join the chain ends with the master link or clip. Verify that the link plate rotates freely but does not allow excessive side play.
Set Proper Tension: Adjust the chain tensioners to achieve the manufacturer-recommended deflection—typically between ½ inch to 1 inch of sag under moderate finger pressure. Avoid over-tensioning, which accelerates wear on sprockets and bearings.
Lubricate: Apply a high-quality chain lubricant along the entire chain, focusing on pivot points. Regular lubrication reduces friction and inhibits rust formation.
Rotate by Hand: With the engine off, manually rotate the header drive to confirm smooth chain movement, correct tension, and absence of binding.
Engage Drive and Observe: Start the combine at low idle, engage the header drive, and observe chain behavior for several minutes. Listen for unusual noises and watch for consistent speed and alignment.
Adjust as Needed: If the chain exhibits tight spots or excessive slack, shut down and re-check tension and alignment.
Regularly inspecting and promptly replacing worn chains can significantly extend header life, reduce downtime during harvest, and ensure consistent crop flow. For detailed specifications on replacement chains and tension settings, contact Shijiazhuang Tianren Agricultural Machinery Equipment Co., Ltd.