Belt Tensioner - Heavy Equipment Parts | XUNPO Global Distribution

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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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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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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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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Drive Belt Tensioner & Cooling Fan Pulley Kit for Bobcat Skid Steers – OEM-Replacement Quality

Stop unexpected downtime and belt slippage on your Bobcat skid steer — this OEM-replacement drive belt tensioner & cooling fan pulley kit delivers consistent tension, quieter operation, and longer belt life across high-hour machines. Direct-fit replacement for factory part numbers 6735884 and 6662997, including correct bearing preload specs and pulley offset — critical for proper fan clearance and belt tracking Covers 15+ Bobcat models: 773, S175, T190, S205, 753, 763, and more — no cross-referencing guesswork Eliminates the “tensioner wobble” common with worn or low-grade kits, preventing premature belt wear and overheating Ready to ship from Guangzhou warehouse — 1-piece MOQ, no minimums, no delays waiting for OEM backorders

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Belt Tensioner Assembly for Cummins 6C, ISB, QSB Engines – Direct Replacement

Stop unexpected belt slippage and premature accessory failure on your Cummins-powered equipment — this belt tensioner delivers consistent, OEM-matched tension right out of the box. Built to replace 3936213, 5259022, and 3976831, it eliminates the guesswork and downtime caused by worn or inconsistent factory units. Fits Cummins 6C, ISB, QSB, 4B3.9, 6B5.9, B6.7, and 10+ other engine families — no cross-referencing headaches Features a precision-calibrated hydraulic damper (not just spring-loaded) for smooth, vibration-dampened tension control Ready to ship same day from our Guangzhou warehouse — no waiting weeks for OEM backorders Backed by XUNPO’s 6-month warranty and technical verification support before you order

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Drive Belt Tensioner Pulley Assembly 6735884 for Bobcat Skid Steer Loaders

Stop unexpected downtime and costly belt slippage on your Bobcat skid steer — this bobcat tensioner pulley delivers OEM-matched tension control and smooth, consistent drive belt tracking across high-hour cycles. Direct-fit replacement for models 653, 751, 753, 763, 773, and 7753 — no modification or alignment guesswork needed Features precision-ground, sealed-for-life ball bearings (not bushings) — critical for resisting heat buildup during extended loader operation Includes both factory cross-references: 6735884 and 6711698 — so you’re covered whether your service manual or parts catalog lists either Ships from our Guangzhou warehouse in 2–5 working days — no waiting weeks for OEM backorders

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Belt Tensioner 87326910 J914086 for CASE Excavators and Loaders

Stop unexpected fan belt slippage and costly downtime on your CASE equipment — this direct-replacement CASE belt tensioner delivers OEM-equivalent tension control with zero fitment guesswork. Built to exact factory specs, it eliminates the risk of counterfeit parts causing premature wear or engine overheating. Fits 30+ CASE models — from 1088 excavators and CX210 loaders to RP110/RP85 engines — all in one verified part Includes dual-spring preload calibration for consistent belt tracking under heavy-duty cycles (a detail critical for high-hour fleet operators) Ships same-day from our Guangzhou warehouse — no waiting weeks for OEM backorders Backed by XUNPO’s 6-month warranty and technical verification support before you order

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Wheel Tensioner 7167165 for Bobcat Skid Steer Loaders – Direct Replacement

Stop downtime from loose or failing wheel tensioners — get precise, long-lasting track tension control on your Bobcat skid steer with the Wheel Tensioner 7167165, a direct OEM replacement built to match factory specs and performance. Fits 18+ Bobcat models including S550, S570, S770, T770, A770, and all major S/T/A-series loaders — no guesswork needed Made with hardened alloy steel pivot bushings and calibrated spring preload — the kind of detail that prevents premature wear in high-vibration, high-cycle applications Ships from our Guangzhou warehouse in 2–5 working days, with MOQ just 1 piece — ideal when you need it now, not next month Backed by XUNPO’s 6-month warranty and technical verification — because swapping in the wrong tensioner costs more than the part

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Tensioner Belt 3937553 for Cummins B3.9L/5.9L Engines – OEM-Replacement Quality

Stop unexpected downtime and costly engine damage from worn or failing belt tension — this Cummins tensioner belt delivers OEM-equivalent performance and precise automatic tension control for B3.9L and 5.9L engines. Built to match the exact spring rate and pivot geometry of genuine Cummins 3937553 units, it maintains optimal serpentine belt deflection across temperature swings and load cycles — a critical spec often overlooked in generic replacements. Direct-fit replacement for Cummins 4BTA, 6BTA, 4BT, 6BT, 6CT, and NT855 engines Rigorously tested for 300,000+ cycles at full operating torque — no premature spring fatigue Includes OEM-spec polyamide pulley with sealed double-row bearings (not pressed-in bushings) Ships same-day from our Guangzhou warehouse — no waiting weeks for OEM backorders

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Belt Tensioner RE518097 for John Deere 4045/6068 Engines – Direct Replacement

Stop unexpected downtime and belt slippage on your John Deere 4045 or 6068 engine — this RE518097 belt tensioner delivers OEM-equivalent tension control right out of the box, so your excavator, loader, or combine stays productive through long shifts. Direct-fit replacement for RE518097 — no modifications, no guesswork, and no risk of misalignment from aftermarket tolerances Features precision-machined spring-loaded pivot geometry — critical for maintaining consistent belt deflection across varying load cycles (a detail often overlooked in generic tensioners) Eliminates the frustration of hunting across multiple suppliers: one part covers 120+ John Deere models — from 200DLC excavators to 9750STS combines and 750J dozers Backed by our 3–12 month warranty and real-time technical verification — because getting the right part the first time matters more than a cheap quote

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