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FAQs

Match the original sprocket type. Segmented sprockets: the sprocket rim is built up of bolt-on segments around a central hub. Suited to larger excavators and crawler-dozers where the sprocket is large and segment-replacement is more economical than full sprocket replacement. Each segment can be replaced individually as it wears. One-piece sprockets: single forging or casting integrated with the final-drive hub. Used on smaller mini-excavators, compact track loaders, and skid-steers. Lower cost, simpler structure, but the entire sprocket is replaced when worn. The sprocket type is listed on every product page.

Sprocket wear is indicated by tooth-wear depth and tooth-profile change. Manufacturers publish wear-limit specifications — typical 8-15mm of tooth-tip wear before replacement is recommended. Visual symptoms: rounded or hooked tooth profiles (the leading edge of each tooth wears more than the trailing edge); sharp or pointed tooth tips (the tooth has worn past its design profile); uneven wear across the sprocket (some teeth wear faster than others, indicating track-chain mismatch). Replace at the manufacturer's wear limit, not after failure — sprocket failure can damage the final-drive gearbox.

Sprocket teeth and track-chain pin-and-bushings interact — they wear against each other under the operational loads. A new sprocket has sharp, properly-shaped teeth; an old worn track-chain has elongated pin-bushing dimensions. Pairing a new sprocket with a worn track-chain means the sprocket teeth bottom-out in the track-chain bushings, accelerating sprocket-tooth wear. Conversely, a new track-chain on a worn sprocket gives the sprocket teeth too little engagement with the chain bushings, causing the chain to skip on the sprocket. Replace as matched sets — sprockets, track-chains, idlers, and rollers all together for major undercarriage rebuild.

Yes. Replacement final-drive gasket sets (sealing the sprocket-mounting hub to the final-drive gearbox), replacement sprocket-mounting bolts and lock-plates (to the OEM specification — wrong-bolt substitution can fail under operational load), replacement segment bolts (for segmented sprockets), and final-drive seal kits are available alongside the sprocket range. Always specify OEM-spec mounting hardware — sprocket-mounting bolts experience high cyclic loading and must match the manufacturer's grade and torque specification.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Sprocket

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Within Under Carriage, Sprocket covers the drive sprockets fitted to plant equipment tracked-undercarriages — the gear-toothed wheels at the rear (or front, depending on equipment design) that drive the track chain via engagement with the track-chain pin-and-bushing assemblies. The sprocket transfers engine power through the final-drive gearbox to the tracks, providing forward and reverse motion.

Parts for Machines supplies sprockets across the plant aftermarket — covering sprockets for the major mini-excavator, compact track loader, skid-steer, larger excavator, crawler-dozer, and crawler-loader ranges (including the equipment-specific sprocket patterns for Caterpillar, Kobelco, Komatsu, Bobcat, Takeuchi, Hitachi, Doosan, JCB, and the wider plant equipment population).

Product pages list the equipment make and model the sprocket is approved for, the sprocket type (segmented sprocket — bolted ring segments around a central hub for serviceable replacement; one-piece sprocket — single forging or casting for smaller equipment; rim-sprocket — separate sprocket rim that bolts to the final-drive housing), the tooth count and pitch (must match the track-chain pin-and-bushing dimensions), the bolt-pattern and hub specification, the wear-rating (the manufacturer's specified maximum tooth-wear before replacement), and the OEM cross-reference.

For replacement of an existing sprocket, the OEM part number is the most reliable match. Where the OEM number isn't available, identify by the equipment make, model, year, and the sprocket's measured tooth count and pitch. Always replace sprockets and matched track-chain assemblies as a set — a worn sprocket damages a new track-chain, and a worn track-chain damages a new sprocket. For large-equipment segmented sprockets, segment-by-segment replacement gives lower material cost than full sprocket replacement, but the labour to remove and refit individual segments must be factored into total replacement cost. Trade pricing on bulk and fleet orders is available; contact the team via WhatsApp 07754288583.

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FAQs

Match the original sprocket type. Segmented sprockets: the sprocket rim is built up of bolt-on segments around a central hub. Suited to larger excavators and crawler-dozers where the sprocket is large and segment-replacement is more economical than full sprocket replacement. Each segment can be replaced individually as it wears. One-piece sprockets: single forging or casting integrated with the final-drive hub. Used on smaller mini-excavators, compact track loaders, and skid-steers. Lower cost, simpler structure, but the entire sprocket is replaced when worn. The sprocket type is listed on every product page.

Sprocket wear is indicated by tooth-wear depth and tooth-profile change. Manufacturers publish wear-limit specifications — typical 8-15mm of tooth-tip wear before replacement is recommended. Visual symptoms: rounded or hooked tooth profiles (the leading edge of each tooth wears more than the trailing edge); sharp or pointed tooth tips (the tooth has worn past its design profile); uneven wear across the sprocket (some teeth wear faster than others, indicating track-chain mismatch). Replace at the manufacturer's wear limit, not after failure — sprocket failure can damage the final-drive gearbox.

Sprocket teeth and track-chain pin-and-bushings interact — they wear against each other under the operational loads. A new sprocket has sharp, properly-shaped teeth; an old worn track-chain has elongated pin-bushing dimensions. Pairing a new sprocket with a worn track-chain means the sprocket teeth bottom-out in the track-chain bushings, accelerating sprocket-tooth wear. Conversely, a new track-chain on a worn sprocket gives the sprocket teeth too little engagement with the chain bushings, causing the chain to skip on the sprocket. Replace as matched sets — sprockets, track-chains, idlers, and rollers all together for major undercarriage rebuild.

Yes. Replacement final-drive gasket sets (sealing the sprocket-mounting hub to the final-drive gearbox), replacement sprocket-mounting bolts and lock-plates (to the OEM specification — wrong-bolt substitution can fail under operational load), replacement segment bolts (for segmented sprockets), and final-drive seal kits are available alongside the sprocket range. Always specify OEM-spec mounting hardware — sprocket-mounting bolts experience high cyclic loading and must match the manufacturer's grade and torque specification.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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