Belt Tensioner
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Belt Tensioner
98 items
Belt Drive Systems
Cummins ISB-Compatible Belt Tensioner Assembly – Overhaul Component
<p><strong>3936213, 5259022, 3976831 Belt Tensioner Assembly</strong> — compatible with Cummins ISB, QSB, 6C, and B6.7 engines, featuring hydraulic damping and forged SAE 1045 steel construction. Part of the front-end belt drive system, this tensioner maintains correct serpentine belt routing across alternator, water pump, and fan drives during variable-RPM off-highway operation. Engine serial variant differences within ISB and QSB families can alter bracket geometry — confirm your build sheet before ordering. Overhaul kit contents and matched components verified for system-level rebuild sequencing.</p> <ul> <li>Cross-reference OEM numbers 3936213, 5259022, 3976831 for identification only</li> <li>IP65 sealing rated for –20°C to +110°C operating range</li> <li>720-hour salt-spray corrosion resistance per ASTM B117</li> <li>Complete assembly with pulley, ready for installation</li> </ul> <p>Dimensional tolerances held to ±0.05 mm with quality inspection records covering pivot torque and damping consistency supplied with each shipment.</p>
Belt Drive Systems
Drive Belt Tensioner Pulley for Bobcat Skid Steer – Engine Grade
<p><strong>6735884 Belt Tensioner Pulley Assembly, Heat-treated 40Cr Steel, Sealed Bearings</strong> — compatible with Bobcat 653, 751, 753, 763, 773, 7753 skid steer loaders.</p> <p>Part of the engine belt drive system; replacing tensioner without inspecting associated belts and idler pulleys risks repeat failure within hours. Cross-reference 6711698 verified for superseded number coverage across engine serial variants.</p> <ul> <li>System-matched belt drive components supplied together for complete overhaul</li> <li>Fitment confirmed by engine model and serial number before dispatch</li> <li>Overhaul kit contents verified item-by-item against your engine build record</li> </ul>
Belt Drive Systems
Belt Tensioner 3936202 – Rebuild Kit for Cummins 4BT 6BT Engines
<p><strong>3936202 Belt Tensioner for Cummins 4BT/6BT Engines</strong> — forged steel bracket with zinc-nickel electroplated surface treatment, operating from –20°C to +110°C. Compatible with Hyundai R210LC-7, R250LC-3 and related excavators during engine overhaul rebuilds.</p> <ul> <li>Replace alongside belts, pulleys, and accessory drive seals to ensure matched condition across the entire front-end drive system after rebuild</li> <li>Engine serial variants across 4BT, 6BT, 6C8.3, and QSB6.7 families require verification before ordering to confirm correct tensioner variant</li> <li>Overhaul kit contents checked item-by-item before dispatch, ensuring all belt drive components ship as a matched set</li> </ul>
Belt Drive Systems
Engine Grade Belt Tensioner 87326910 J914086 Replacement for CASE
<p><strong>Belt Tensioner 87326910 J914086, forged steel housing with sealed IP65 bearings</strong> — replacement for CASE excavator, loader, and dozer engines across CX, 580, 680, 850, and 888 series.</p> <ul> <li>Operates within the <strong>engine belt drive system</strong>, maintaining correct fan, alternator, and coolant pump belt tension during rebuild</li> <li>Matched sets available with pulleys and belts to address root-cause slippage or overheating faults</li> <li>Spring rated to 1.2 million cycles; pivot shaft held to ±0.02 mm tolerance for consistent preload</li> <li>Fits CASE engine variants including 4390, 4391, 6590, and 6830T families</li> </ul> <p>Overhaul kit contents verified item-by-item against your specific engine build before dispatch.</p>
Belt Drive Systems
Belt Tensioner 3976832/3911621 Replacement for Cummins – Engine Grade
<p><strong>Belt Tensioner 3976832/3911621, die-cast aluminum housing with 42CrMo steel pivot shaft</strong> — compatible with Cummins 4B3.9, 6B5.9, and QSB5.9 engine families used in Hyundai R305LC-7, R290LC-7, and HL740-9 series equipment.</p> <ul> <li>Correct tensioner selection prevents cascading failures in belts, alternators, water pumps, and cooling fans during engine rebuilds</li> <li>Matched to serpentine belt routing and pulley count for each engine build variant</li> <li>Identifies root-cause failures including misalignment, worn pulley bearings, or bracket fatigue</li> </ul> <p>Complete overhaul kit contents verified against your engine serial prefix and CPL number before dispatch.</p>
Belt Drive Systems
Tensioner Belt 3937553 for Cummins B3.9L & 5.9L – Overhaul Component
<p>Overhaul kit contents verified line-by-line against your engine build sheet before dispatch.</p>
Belt Drive Systems
Belt Tensioner 5333477 | Rebuild Kit for Cummins 6BT 4BT 5.9L
<p><strong>Belt Tensioner 5333477 (cross-reference) for Cummins B3.9L, 4BT, 6BT, 5.9L engines</strong> — high-silicon aluminum housing with cold-wound spring rated to 12,000+ cycles.</p> <ul> <li>Fits Cummins 6B, 6BTA, 4BTA, NT855, 6CT, QSB6.7, and QSF2.8 variants in the accessory belt drive system</li> <li>System-matched for complete engine rebuilds — replace alongside serpentine belt, idler pulleys, and front crankshaft seal to address root causes of repeat slippage</li> </ul> <p>Overhaul kit contents verified item by item before dispatch.</p>
Belt Drive Systems
Belt Tensioner Replacement for New Holland T6080/T6090/T7.210
<p><strong>504315786 Belt Tensioner for New Holland T6080/T7.210, F4DFE/F4HFE Engine Series</strong> — replacement for cross-reference 504028028, 87803067, 2856945.</p> <ul> <li>Fits New Holland T6080, T6090, T7.210, TS6030 and compatible loaders with F4DFE/F4HFE series engines</li> <li>Part of the engine belt drive system — protects alternator, water pump, and AC circuit during and after rebuild</li> <li>Sealed bearing and heat-treated alloy steel housing for continuous-duty agricultural operation</li> </ul> <p>Engine code and serial variant must be confirmed to select the correct tensioner from the cross-reference list. Overhaul kit contents and matched belt drive components verified item-by-item before dispatch.</p>
Belt Drive Systems
Drive Belt & Tensioner Assembly | Matched Set for Bobcat S510-T595
<p><strong>7257359 Drive Belt & Tensioner Assembly, EPDM with Aramid Reinforcement</strong> — replacement for Bobcat S510, S530, S550, S560, S570, S590, S595, T550, T590, T595 skid steer and compact track loaders.</p> <ul> <li>Supplied as a matched belt-and-tensioner set to maintain correct accessory drive geometry and prevent repeat failures linked to worn pulleys or degraded seals during engine rebuilds.</li> <li>Addresses root-cause issues: insufficient tension reduces fan airflow, raising coolant temperature and accelerating cylinder head gasket wear.</li> <li>Cross-reference verified against multiple OEM interchange numbers for serial-range accuracy.</li> </ul> <p>Matched assembly contents checked item by item against your engine build before dispatch.</p>
Belt Drive Systems
System-Matched Belt Tensioner RE548027 – Fits John Deere 4045 6068 3029
<p><strong>RE548027 Belt Tensioner, Dual-Stage Torsion Spring, Forged Steel Bracket</strong> — compatible with John Deere 4045, 6068, and 3029 engines for belt drive system rebuilds.</p> <ul> <li>Works in concert with idler pulleys, fan hub, alternator, and water pump; matched supply prevents accessory bearing wear caused by mismatched spring rates.</li> <li>Verify engine serial prefix (e.g., T04045) and accessory bracket configuration before ordering to confirm mounting geometry.</li> </ul> <p>Overhaul kit contents and spring force curve documentation ship with every unit for rebuild bench verification.</p>
Belt Drive Systems
Belt Tensioner 04133543 for Deutz D2.9L4 – Engine Grade
<p><strong>Belt Tensioner 04133543, forged carbon steel hub with IP65 double-sealed bearing</strong> — replacement for Deutz D2.9L4, TD2.9L4 and TD2.9L04 engines. This pulley sits at the heart of the front-end belt drive system; sourcing it alongside matched V-ribbed belts, idler pulleys and auxiliary gaskets ensures a complete rebuild in one pass. Bore tolerance held to ±0.05 mm and face runout within ±0.1 mm eliminate shim rework during reassembly.</p> <ul> <li>Overhaul kit contents verified item-by-item before dispatch</li> </ul>
Belt Drive Systems
Belt Tensioner Assembly for Cummins 6C ISB QSB – System-Matched
<p><strong>3936213, 5259022, 3976831 (cross-reference) Belt Tensioner Assembly</strong> for Cummins 6C, ISB, QSB, ISC, QSC, ISL, and QSL engine families.</p> <ul> <li>This tensioner belongs to the <strong>front-end accessory drive system</strong> — matched replacement alongside belts, idler pulleys, and front crankshaft seals prevents cascading failures during engine overhaul.</li> <li>Hydraulic damping with NBR double-lip seal rated for diesel and coolant exposure, supporting stable tension through 3,500 rpm.</li> <li>Spring force and pivot tolerance verified per SAE J1922 flange mounting.</li> </ul> <p>Overhaul kit contents inspected item-by-item before dispatch to match your specific engine build.</p>