Belt Drive Systems - Heavy Equipment Parts

Belt Tensioner 3976832/3911621 for Cummins 4B3.9–QSB5.9 Engines

Stop unexpected downtime and belt slippage on your Cummins-powered equipment — this Cummins belt tensioner delivers OEM-equivalent performance with faster delivery and better value than factory parts. Built to exacting tolerances, it maintains consistent belt preload across temperature swings and load cycles — a critical factor often overlooked in aftermarket units that leads to premature alternator or water pump failure. Fits Cummins 4B3.9–QSB5.9 engines and Hyundai R305LC-7/R290LC-7 excavators without modification Replaces 12 part numbers including 3976832 and 3911621, eliminating sourcing headaches across multiple suppliers Features hardened steel pivot bushings and calibrated torsion spring — the same wear-resistant design used in CM550/CM850-series service upgrades Stocked and ready to ship from Guangzhou warehouse — no waiting weeks for OEM backorders

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420 chain sprocket kit for Coleman KT196/CK196 go kart — 25T, 32-link, wear-resistant

Stop chain slippage and extend drivetrain life on your Coleman KT196 or CK196 go kart — the 420 chain sprocket kit delivers precise 25T/32-link engagement with zero pitch mismatch, so your 196cc or 212cc (6.5hp) engine transfers power smoothly under load. Made from hardened steel with CNC-machined tooth profiles — critical for maintaining correct chain wrap angle on small-diameter jackshaft sprockets Pre-assembled kit includes driven sprocket + front jackshaft sprocket + 420 roller chain — no guesswork matching components Wear-resistant surface treatment resists pitting and elongation longer than standard carbon steel kits Fits KT196/CK196 chassis out of the box — no spacer shimming or hub reaming needed

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Drive & Alternator Belt Set for Bobcat 753–T190 – Direct OEM Replacement

Stop downtime from snapped or slipping belts — this bobcat belt set delivers OEM-equivalent performance and fit for your 753, T190, and 8 other Bobcat loaders, so you’re back operating in minutes, not days. Includes both the drive belt (6675837) and alternator belt (6726898) — no guesswork pairing mismatched lengths or tension specs Made with aramid-reinforced EPDM rubber: resists heat, oil, and flex fatigue far better than generic replacements Verified fit for all listed models — including correct pulley wrap angles on S-series and T-series swing-frame designs Ships same day from our Guangzhou warehouse when ordered before 3 PM CST — no waiting weeks for OEM backorders

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Fan Belt 6718730 for Bobcat Skid Steer Loaders – High-Durability Replacement

Stop unexpected shutdowns and costly downtime caused by cracked or slipping fan belts on your Bobcat skid steer — this bobcat fan belt 6718730 delivers OEM-matching tension retention and heat resistance, even under continuous high-RPM operation. Exact-fit replacement for Bobcat S150, S160, S175, S185, S205, T180, T190, and legacy 5600/773 models — no guesswork, no fitment delays Manufactured with aramid-reinforced EPDM compound — the same material spec used in premium aftermarket belts to resist ozone cracking and thermal degradation Ships from our Guangzhou warehouse within 2–5 working days, MOQ just 1 piece — ideal when you need it *now*, not next month Backed by XUNPO’s 6-month warranty against manufacturing defects — because belt failure shouldn’t mean a second repair call

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Drive Belt 422280651/422280652 for Can-Am Maverick X3 & Defender HD8/HD10 – High-Durability Replacement

Stop losing power and risking belt failure mid-ride — this high-torque Can-Am drive belt delivers OEM-matching durability with faster throttle response and smoother engagement on aggressive terrain. Built for the heat and load spikes of turbocharged Maverick X3s and heavy-duty Defender HD8/HD10s, it eliminates the premature stretching and edge cracking that plague budget replacements. Fits both 422280651 and 422280652 applications — no guesswork when ordering for X3 Turbo R, MAX X RS, or HD10 XMR models Features aramid-reinforced Kevlar cords and optimized pitch geometry — the same core construction used in factory-spec belts for sustained high-RPM clutching Direct replacement: installs in minutes with no modifications, and ships from our Guangzhou warehouse within 2–5 working days Backed by XUNPO’s 6-month warranty against manufacturing defects — because downtime on a jobsite or trail shouldn’t start with a $299 belt failure

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Belt Tensioner Kit for Bobcat Skid Steers – Direct Replacement for S130–S300, T140–T300, A220–A300

Stop unexpected downtime and costly fan drive failures on your Bobcat skid steer — this bobcat belt tensioner kit delivers OEM-equivalent performance with faster shipping and better value than factory parts. Built for high-cycle machines like the S130–S300, T140–T300, and A220–A300, it eliminates guesswork and keeps your loader running through tough jobs. Includes the critical fan drive idler pulley (6662997) plus full tensioner arm assembly — no sourcing gaps or mismatched components Every part is pre-matched and tested: thrust bearing (6655781), torsion spring (6700115), grease ring (6660995), and OEM-spec O-ring (6704820) Ships from our Guangzhou warehouse in 2–5 days — no waiting weeks for OEM backorders Fits 653–963, S-series, T-series, and A-series models — one kit covers your entire Bobcat fleet

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139T 1-1/8″ Rear Drive Belt for Harley Touring Models – OEM-Replacement Quality

Stop worrying about unexpected breakdowns or OEM delays — this harley rear drive belt delivers OEM-equivalent performance and fit, right out of the box, so your Touring bike stays on the road longer with zero compromise. 139T tooth count + precise 1-1/8" width (28.5mm) ensures perfect meshing with stock pulleys — no slippage, no premature wear, just smooth, quiet power transfer Fits exact 2004–2006 FLHT, FLHR, FLHRCI, FLHTCI, and FLTRI models — verified against factory service specs, not just part numbers Replaces 40024-04, 1204-0063, 58-439, and five other cross-references — no guesswork when matching to your VIN or existing belt Built with aramid-reinforced HTD profile for heat resistance and torsional stiffness — the same spec used by top-tier aftermarket brands servicing high-mileage touring fleets

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R123307 Replacement Belt for John Deere 3.9L–6.8L Engines – High-Tensile OEM-Equivalent

Stop losing uptime to belt slippage or unexpected breakage on your John Deere 3.9L–6.8L engines — the R123307 replacement belt for John Deere 3.9L–6.8L engines delivers OEM-equivalent grip and longevity, even under high-load alternator drive cycles. Engineered with aramid-reinforced tensile cords — the same specification used in genuine JD serpentine belts for 4045 and 6068 platforms Fits 12+ John Deere engine variants including 3029, 4039, 4045, 6068, and all 2.9L/3.9L/4.5L/6.8L displacements Ships from our Guangzhou warehouse in 2–5 working days — no waiting weeks for OEM backorders Each belt undergoes pre-shipment tension & flex-cycle testing to eliminate premature stretch or edge cracking

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Belt Tensioner 3976834/3957434 for Cummins ISBE6.7 & 6CT Engines – Direct Replacement

Stop unexpected belt slippage and premature accessory failure on your Cummins ISBE6.7 or 6CT engine — this Cummins belt tensioner delivers OEM-equivalent spring force retention and pivot-arm durability, so your alternator, AC, and power steering stay reliably driven. Direct-fit replacement for part numbers 3976834 and 3957434 — no bracket modifications or tension adjustments needed Features hardened steel pivot bushings and a calibrated torsion spring (not stamped-steel imitations) — critical for engines with high-vibration duty cycles like quarry or fleet applications Stocked and ready to ship from Guangzhou — bypass the 3–4 week OEM wait and get back online in 2–5 working days Fits Cummins ISBE6.7, 6CT, 6BT, 6CT8.3, and 6BT5.9 engines — one tensioner covers your most common medium-duty platforms

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Drive Belt 07200921 for Ariens & Gravely 52″ Zero-Turn Mowers – Heavy-Duty Replacement

Stop downtime and get back to mowing—this 07200921 drive belt delivers OEM-matching durability and precise fit for Ariens Ikon 52" and Gravely ZT XL 52 zero-turns, so your deck drive stays tight and responsive season after season. Engineered with reinforced aramid tensile cords—critical for handling the high-torque, side-load stress unique to 52" zero-turn deck drives Fits exact SN ranges: Ariens models 918004/005/026/028 (all Kohler & Kawasaki FR variants) and Gravely 918010/011/014/015 (ZTX & ZT XL 52, across all engine & serial breaks) No guesswork: pre-stretched during manufacturing to eliminate initial stretch-in and prevent premature slippage or misalignment Ships from our Guangzhou warehouse in 2–5 working days—even for single-piece orders—so urgent replacements never stall your schedule

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Cooling Fan Belt Tensioner Kit 7302291 for Bobcat Skid Steer Loaders – Direct Replacement

Stop unexpected fan belt slippage and overheating on your Bobcat—this bobcat tensioner kit delivers OEM-equivalent tension control right out of the box, so your skid steer stays cool and productive through long shifts. No more guessing whether a worn tensioner is causing erratic belt noise or premature failure. Direct-fit replacement for 7302291 — includes all mounting hardware, spring-loaded arm, and precision-machined pivot bushing (not just the bracket) Covers 25+ Bobcat models including S160, S175, T190, and T300 — verified against factory service diagrams, not just part number cross-references Pre-tested for consistent 85–95 N·m dynamic tension retention — critical for high-RPM cooling fans on Tier 4 engines Ships same day from Guangzhou warehouse; MOQ is just 1 piece, no minimum order hassle for urgent field repairs

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Belt Tensioner RE548027 for John Deere 4045/6068/3029 Engines – Direct OEM Replacement

Stop unexpected belt slippage and premature engine wear—this John Deere belt tensioner RE548027 delivers OEM-equivalent hold and alignment for 4045, 6068, and 3029 engines, so your tractor or sprayer stays online longer between service intervals. Fits verified John Deere models including 5082E, 7200R, STS 12, DPS 12, and 310K backhoe loaders—no guesswork on compatibility Features the exact spring rate and pivot geometry required to maintain ±0.8mm belt deflection tolerance—the spec that prevents harmonic vibration damage in high-RPM applications Ships from Guangzhou warehouse same-day if ordered before 3 PM CST; no waiting weeks for OEM backorders Each unit is pre-tested for dynamic load response at 120 Nm torque—just like factory calibration, not just static fit

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