Belt Tensioner
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Belt Tensioner
72 items
Belt Drive Systems
System-Matched Belt Tensioner – Fits Cummins 6C ISB QSB
<p><strong>3936213 5259022 3976831 Belt Tensioner</strong> – A380 aluminum alloy housing with T6 heat treatment, 40Cr steel pivot shaft, complete assembly.</p> <ul> <li>Fits Cummins 6C, ISB, QSB, 6B5.9, ISC, QSC, ISL, QSL and John Deere 7200R, 8370R, S770 engines</li> <li>Dual-lip NBR sealing prevents grease migration into timing covers during front-end rebuilds</li> <li>Tensioner spring fatigue causes belt slippage and accessory drive noise; replace as a matched set with serpentine belt and idler pulleys during overhaul</li> <li>System-level belt drive supply ensures correct tension control for alternator output and coolant pump flow</li> </ul> <p>Oversize grades and matched component sets confirmed against your engine serial before dispatch.</p>
Belt Drive Systems
Rebuild Kit Belt Tensioner RE518097 Compatible with John Deere
<p><strong>RE518097 Belt Tensioner</strong> for John Deere 4045, 6068 and 6125 series engines — forged steel housing, SAE J1926 sealing, dynamic force 120–135 N·m</p> <ul> <li>Fits within the front-end belt drive system; replace with idler pulleys, belts and fan hub bearings as a matched set during overhaul to prevent premature re-failure caused by mismatched wear across the drive loop.</li> <li>Confirm engine serial prefix before ordering, as 4045 and 6068 variants may differ in belt routing and tensioner mounting configuration.</li> </ul> <p>Overhaul kit contents verified item by item before dispatch to ensure every belt drive component matches your engine build record.</p>
Belt Drive Systems
Belt Tensioner 3936202 3917485 3964636 – Overhaul Component for Cummins 4BT 6BT
<p><strong>Belt Tensioner 3936202 3917485 3964636 for Cummins 4BT / 6BT / 6C8.3</strong> — engineered to match Cummins accessory drive preload specifications across 4B3.9, 6B5.9, B4.5, QSL9, and QSB6.7 engine families used in Hyundai R130LC-3 through R250LC-3 excavators.</p> <ul> <li>Works as part of a matched belt drive set — replacing without inspecting idler pulleys, belt condition, and bracket alignment risks repeat failure within hundreds of hours</li> <li>Spring force and pivot torque verified per engine serial variant to ensure correct alternator and water pump engagement</li> </ul> <p>Cross-reference numbers (3936202, 3917485, 3964636) validated against engine build records — matched belt drive overhaul components ship together with full system compatibility confirmed.</p>
Belt Drive Systems
Tensioner Belt 3937553 | Engine Grade for Cummins B3.9L 5.9L 4BTA 6BTA
<p><strong>Belt Tensioner 3937553</strong> for Cummins B3.9L, B5.9L, 4BT, 6BT, 4BTA, 6BTA engines — forged SAE 1045 steel hub, HRC 40–45 heat treatment, ±3 N·m preload tolerance.</p> <ul> <li>Critical to the belt drive system during engine overhaul; replace alongside belts and pulleys as a matched set to ensure consistent tension and prevent early belt wear or slippage.</li> <li>Superseded or variant differences exist between serial ranges — confirm engine build before ordering.</li> </ul> <p>Overhaul kit contents cross-checked line by line before dispatch.</p>
Belt Drive Systems
Belt Tensioner for New Holland Tractor – Engine Grade
<p><strong>Belt Tensioner 504315786 504028028 87803067, High-Strength Ductile Iron Housing, Zinc-Nickel Plated</strong> — replacement for New Holland T6080, T7.210, TS135A and B95B series engines. </p> <ul> <li>Part of the front-end belt drive system; matched supply with belts, idlers and fan pulleys to prevent secondary failure from adjacent worn components </li> <li>Spring deflection and radial runout verified per engine serial variant, supporting accurate fitment across F4DFE/F4HFE rebuild histories </li> <li>Overhaul kit contents cross-checked line-by-line before dispatch</li> </ul>
Belt Drive Systems
Bobcat-Compatible Belt Tensioner Pulley 7269057 – Overhaul Component
<p><strong>7269057 Belt Tensioner Pulley for Bobcat A770, S630–S850, T630–T870</strong> — forged 40Cr steel housing with sealed 6203-2RS angular contact bearing, SPZ belt groove profile.</p> <ul> <li>Fits Bobcat skid steer and track loader engines as accessory drive tensioner (cross-reference 7141788)</li> <li>Correct tensioning protects fan drive, alternator, and cooling circuit from cascading failure</li> <li>Replace as matched set with belts and idler pulleys during engine overhaul to address root cause</li> </ul> <p>Overhaul kit contents verified item-by-item against your engine serial variant before dispatch</p>
Belt Drive Systems
RE548027 Belt Tensioner for John Deere 4045 6068 – Engine Grade
<p><strong>RE548027 Belt Tensioner</strong>, replacement for John Deere 3029, 4045, and 6068 engines, forged steel with zinc-nickel finish.</p> <ul> <li>Coordinates directly with serpentine belt, idler pulleys, and water pump during system-level engine overhaul to prevent misalignment-induced failures across the accessory drive circuit.</li> <li>Engine serial prefix confirmation ensures correct variant selection within the 4045/6068 family, where accessory bracket layouts differ across model generations.</li> <li>Overhaul kit contents and matched tolerances verified per your engine's rebuild history before dispatch.</li> </ul>
Belt Drive Systems
Belt Tensioner 6735884 | Matched Set for Bobcat T140 T180
<p><strong>Belt Tensioner 6735884 Pulley Assembly</strong>, forged AISI 1045 carbon steel hub with sealed 6203-2RS double-row angular contact bearings, induction hardened to HRC 58–62.</p> <ul> <li>Fits Bobcat T140, T180, T190, T550, T590 compact track loaders</li> <li>Addresses root-cause belt drive wear — tensioner, belt, and idler pulleys supplied as a matched engine-system set to align tolerances and prevent repeat failure within hundreds of hours</li> <li>Cross-reference 6711698 verified; confirm engine serial number to identify correct variant for your specific build</li> </ul> <p>Complete belt drive kit matching and overhaul content checklist reviewed per engine serial before dispatch.</p>
Belt Drive Systems
Belt Tensioner Replacement for Bobcat 873 S130 T190 Powertrain
<p><strong>6662997, 6702474, 6725212 Belt Tensioner Kit</strong> — complete fan-drive assembly including idler pulley, torsion spring, CNC-machined 6061-T6 aluminum arm, and SAE J200 Class B nitrile O-rings.</p> <ul> <li>Fits Bobcat skid steer and track loaders: S130, S220, S300, T190, T250, 873, and 25+ additional models</li> <li>608ZZ deep-groove bearing with double-lip nitrile seals rated IP54 for high-dust engine compartments</li> <li>ASTM A228 music wire spring heat-treated to Rockwell C47–50 for sustained high-cycle fatigue resistance</li> </ul> <p>Addresses the full belt-drive system during engine overhaul — matched tolerances across pulley, spring, and arm prevent premature re-failure from mismatched components. Kit contents verified against engine serial prefix before dispatch.</p> <ul> <li>6-month warranty covers all kit components</li> <li>Cross-reference only: 6662997, 6702474, 6725212</li> </ul>
Belt Drive Systems
Engine Grade Cooling Fan Belt Tensioner Kit 7302291 for Bobcat
<p><strong>7302291 Belt Tensioner Kit</strong> for Bobcat skid steer, track and all wheel loaders — cold-forged steel housing, matched to engine cooling fan belt drive systems.</p> <ul> <li>Fits Bobcat 653, 753, 863, S185, T200 and more (cross-reference only)</li> <li>Restores proper fan belt tension within the engine accessory drive; inspect belt, pulleys and water pump together during cooling system service</li> <li>Verify engine serial variant before ordering — rebuild history may affect pulley shaft fit</li> </ul> <p>Oversize and grade confirmed against engine rebuild records; matched components ship together.</p>
Belt Drive Systems
Engine Grade Belt Tensioner 04133543 – Fits DEUTZ TD2.9L4
<p><strong>Belt Tensioner 04133543, Forged SAE 1045 Steel, Sealed Double-Row Ball Bearings</strong> — compatible with DEUTZ D2.9 L4, TD2.9 L4, and TD2.9L04 engine belt drive systems.</p> <ul> <li>Replacing this tensioner during an engine overhaul requires matching it with the V-belt, adjacent idlers, and sealing components as a complete set, ensuring uniform tension and tolerance across the entire drive chain. System-level verification prevents premature re-failure caused by misalignment or worn companion parts.</li> <li>Quench-and-temper heat treatment and IP54-rated sealed bearings maintain performance under dust, oil mist, and thermal cycling typical in quarry, mining, and demolition environments.</li> <li>Overhaul kit contents cross-checked line by line before dispatch, matched to your specific engine serial variant and rebuild history.</li> </ul>
Belt Drive Systems
Engine Grade Belt Tensioner & Fan Pulley Kit 6735884 6662997 – Fits Bobcat Skid Steer
<p><strong>6735884 6662997 Belt Tensioner & Fan Pulley Kit, forged steel hub, sealed bearing</strong> — matched components for Bobcat skid steer engine belt drive and cooling systems. Replacing the tensioner without addressing pulley bearing wear often leads to repeated belt failure; this kit supplies both parts with dimensional tolerances verified for drop-in fit on models 653, 751, 753, 763, 773, S130, S150, S160, S175, S185, S205, T140, T180, and T190.</p> <ul> <li>OEM reference 6735884 / 6662997 (cross-reference only)</li> <li>Pre-greased sealed bearings aligned with engine overhaul intervals</li> <li>Fits belt drive and cooling system restoration or full rebuild</li> </ul> <p>Kit contents verified against your engine serial configuration before dispatch.</p>