Belt Tensioner Compatible with 1995-2006 Case 621/621B/621C 6BT 5.9L Diesel Smooth Wheel Loader 3914086

<b>OEM PART NUMBERS:</b><br>- Cummins: 3914086 (Primary OEM number)<br>- Cummins: 3937553 (Superseded/alternate number)<br>- Cummins: 3917485 (Superseded/alternate number)<br>- Cummins: 3922900 (Alternate Cummins number)<br>- Cummins: 3934818 (Alternate Cummins number)<br><br><b>SPECIFICATIONS:</b><br>- Pulley Type: Smooth<br>- Belt Type: Serpentine<br>- Engine Family: 4BT/6BT<br>- Aspiration: Turbocharged<br>- Condition: New<br><br><b>APPLICATIONS:</b><br>- Case 621/621B/621C 6BT 5.9L Diesel (1995-2006)<br>- Komatsu PC210-6D/PC210-7/PC210-8K 6BT/QSB 5.9/6.7L Diesel (1996-2010)<br>- Komatsu WA200-5/WA200-6/WA250-5/WA250-6 4BT/6BT 3.9/5.9L Diesel (2002-2016)<br>- Komatsu WA320-5/WA320-6 6BT 5.9L Diesel (2002-2016)<br>- Cummins 4BT 3.9/4BTA 3.9/6BT 5.9/6BTA 5.9 4BT/6BT 3.9/5.9L Diesel (1984-2007)<br><br><b>IMPORTANT:</b><br>This tensioner has a SMOOTH (flat) pulley — designed for flat/non-grooved serpentine belts on Cummins 4BT 3.9L and 6BT 5.9L mechanical engines. If your engine uses a GROOVED (V-ribbed) belt, you need 3976831 instead. Ordering the wrong pulley type is the #1 mistake — a smooth pulley on a ribbed belt causes rapid belt wear and premature failure.<br><br>Supersedes 3937553, 3917485. Alternates: 3922900, 3934818, 5333477. Case IH cross-references: 87326910, 47683084. Fits mechanical B-series engines in Case wheel loaders (621 series), Komatsu excavators (PC210) and wheel loaders (WA200-WA320), and other off-highway equipment with 4BT/6BT power.<br><br>Failure symptoms: belt squeal, alternator undercharging, cooling system overheating from water pump slippage. A worn tensioner spring allows excessive belt deflection even if the belt itself is new. Inspect belt condition and routing before installing — verify the belt rides on the smooth side of pulleys throughout the drive path.<br><br>⚠️ SMOOTH pulley only — if your belt has ribs/grooves, order 3976831 instead.<br>

• Rareelectrical Compatible With Case, Case Ih, Cummins, Komatsu
• Case Wheel Loaders: &Bull; Case 621/621B/621C 6Bt 5.9L Diesel (1995-2006) Komatsu Excavators: &Bull; Komatsu Pc210-6D/Pc210-7/Pc210-8K 6Bt/Qsb 5.9/6.7L Diesel (1996-2010) Komatsu Wheel Loaders: &Bull; Komatsu Wa200-5/Wa200-6/Wa250-5/Wa250-6 4Bt/6Bt 3.9/5.9L Diesel (2002-2016) &Bull; Komatsu Wa320-5/Wa320-6 6Bt 5.9L Diesel (2002-2016) Cummins Industrial Engines: &Bull; Cummins 4Bt 3.9/4Bta 3.9/6Bt 5.9/6Bta 5.9 4Bt/6Bt 3.9/5.9L Diesel (1984-2007) Important: This Tensioner Has A Smooth (Flat) Pulley — Designed For Flat/Non-Grooved Serpentine Belts On Cummins 4Bt 3.9L And 6Bt 5.9L Mechanical Engines. If Your Engine Uses A Grooved (V-Ribbed) Belt, You Need 3976831 Instead. Ordering The Wrong Pulley Type Is The #1 Mistake — A Smooth Pulley On A Ribbed Belt Causes Rapid Belt Wear And Premature Failure. Supersedes 3937553, 3917485. Alternates: 3922900, 3934818, 5333477. Case Ih Cross-References: 87326910, 47683084. Fits Mechanical B-Series Engines In Case Wheel Loaders (621 Series), Komatsu Excavators (Pc210) And Wheel Loaders (Wa200-Wa320), And Other Off-Highway Equipment With 4Bt/6Bt Power. Failure Symptoms: Belt Squeal, Alternator Undercharging, Cooling System Overheating From Water Pump Slippage. A Worn Tensioner Spring Allows Excessive Belt Deflection Even If The Belt Itself Is New. Inspect Belt Condition And Routing Before Installing — Verify The Belt Rides On The Smooth Side Of Pulleys Throughout The Drive Path. ⚠️ Smooth Pulley Only — If Your Belt Has Ribs/Grooves, Order 3976831 Instead.
• Oem Part Numbers: &Bull; Cummins: 3914086 (Primary Oem Number) &Bull; Cummins: 3937553 (Superseded/Alternate Number) &Bull; Cummins: 3917485 (Superseded/Alternate Number) &Bull; Cummins: 3922900 (Alternate Cummins Number) &Bull; Cummins: 3934818 (Alternate Cummins Number) &Bull; Cummins: 5333477 (Alternate Cummins Number) &Bull; Case Ih: 87326910 (Case Ih Cross-Reference) &Bull; Case Ih: 47683084 (Case Ih Cross-Reference) Specifications: &Bull; Pulley Type: Smooth &Bull; Belt Type: Serpentine &Bull; Condition: New Application: &Bull; Compatible With Case 621/621B/621C (1995-2006) &Bull; Compatible With Komatsu Pc210-6D/Pc210-7/Pc210-8K (1996-2010) &Bull; Compatible With Komatsu Wa200-5/Wa200-6/Wa250-5/Wa250-6 (2002-2016)
• Source: Aftermarket
• One Year Manufacturer's Warranty.