Keep your Cummins 4B3.9/6B5.9 engine and Hyundai R305LC-7/R290LC-7 excavator running at peak performance with this reliable Belt Tensioner 3976832. Precisely engineered to maintain optimal belt tension, it prevents slippage and premature wear, reducing costly downtime during critical operations.
| Parameter | Details |
|---|---|
| Part Name | Belt Tensioner |
| Replacement Part Numbers | 3976832, 3937556, 3936207, 3934823, 3911621, 3922901, 3973825, 3936208, 3934824, 3928748, 3279446, 4063951 |
| Compatibility | Cummins Engines, Hyundai Excavators, Hyundai Wheel Loaders, Hyundai Forklifts |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| Brand | Applicable Models |
|---|---|
| Cummins Engine | 4B3.9, 6B5.9, 6C8.3, B5.9 G, B5.9 GAS PLUS CM556, B5.9 LPG PLUS CM556, C GAS PLUS CM556, C8.3 G, ISB (Chrysler), ISB CM550, QSB5.9 CM550, QSB5.9 CM850, 4BT3.9, 6BT5.9, ISB3.9, ISB4.5, QSB3.9, 6C, 6CT, 6CTA, 6CTAA, C8.3L |
| Hyundai Excavator | R305LC-7, R290LC-7, R290LC-3, R290LC-3_LL/RB, R250LC-7 |
| Hyundai Wheel Loader | HL757-7, HL740-9B, HL740-9S, HL760, HL740-3, HL740TM-3, HL750-3, HL750TM3, HL750TM, HL720-3C, HL730-3, HL7303C, HL730TM-3, HL730TM3C, HL740-3ATM, HL740TM-3A |
| Hyundai Forklift | 42HDLL, 39HDRB, HDF35AII, HDF45AII |
| Military Vehicles | M939, M939A1, M939A2, M923, M931, M936, M925 |
Construction sites don’t wait for broken equipment. A failed belt tensioner on your Cummins 4B3.9 or 6B5.9 engine can shut down your Hyundai R305LC-7 excavator for days, costing thousands in lost productivity. Many operators waste time with cheap knockoffs that fail after weeks, or wait 2-4 weeks for overpriced OEM parts. When your machine is down, every day matters.
Our Belt Tensioner 3976832/3911621 solves these problems with ISO-certified manufacturing and rigorous pre-shipment testing. As a 10-year global supplier with 20+ engineering experts, we ensure each tensioner meets OEM specifications for fit and function. Whether you’re repairing a Hyundai R290LC-7 in a mining operation or maintaining a fleet of Cummins-powered equipment, our ready-to-ship inventory means you can get back to work in 2-5 days, not weeks.
Belt tensioners maintain proper drive belt tension in the harshest conditions—from dusty construction sites to high-vibration mining operations. A faulty tensioner causes belt slippage, leading to overheating alternators, failed water pumps, and unexpected breakdowns. Our tensioners are engineered to handle the continuous load of heavy machinery, ensuring your Cummins engine runs at peak efficiency even during extended operation.
Every component of our belt tensioner is designed for durability. The precision-machined pulley housing resists warping under thermal stress, while high-grade bearing assemblies reduce friction and extend service life. The spring-loaded tensioning mechanism maintains consistent pressure across temperature extremes, preventing belt wear and extending replacement intervals. We mirror OEM dimensions exactly, ensuring seamless installation without modifications—critical for maintaining equipment uptime.
Choosing an uncertified belt tensioner may save money upfront, but the true cost appears later. Counterfeit parts often fail within 3-6 months, requiring repeat repairs and causing secondary damage to belts, pulleys, and engine accessories. Our ISO-certified tensioners, backed by a 3-12 month warranty, deliver reliable performance that reduces total maintenance costs. When you factor in avoided downtime and repair expenses, the value becomes clear.
We build trust through verified quality and transparent service. Our tensioners come from ISO 9001-certified factories, with each unit inspected for material quality and performance before shipment. With 10,000+ parts in stock at our Guangzhou warehouse, we ship most orders within 48 hours. Our technical team responds to part verification requests within 2 hours, ensuring you get the right component the first time. Over 10 years of exporting to 120+ countries means we understand global logistics and quality standards.
Don’t let a failed belt tensioner delay your project. Send us your machine model, required quantity, and destination, and we’ll provide a competitive quote within 24 hours. First-time customers can request sample testing to verify quality. With our ready inventory and fast shipping, you can replace your tensioner and resume operations quickly—minimizing downtime and maximizing productivity.
Q: Is this a genuine OEM part or an aftermarket replacement?
A: This is an OEM-equivalent aftermarket part, manufactured in ISO-certified facilities to match original specifications and performance standards.
Q: How do I confirm this tensioner fits my specific machine?
A: Provide your machine model, engine type, or original part number, and our technical team will verify compatibility within 2 hours.
Q: What warranty coverage do you offer?
A: We provide a 3–12 month warranty against manufacturing defects, with free replacement or refund for qualifying issues.
Q: What is the minimum order quantity?
A: The minimum order quantity is 1 piece, ideal for emergency repairs or single-unit maintenance.
Q:
Not sure if this part fits your machine? Send us your machine model number and serial number via WhatsApp or email -- our specialists will verify compatibility within 2 hours.
Fill in your details and we'll respond within 24 hours with a competitive quote.
Explore more high-quality excavator and heavy equipment parts from XUNPO.
Keep your Cummins 4BT, 6BT, or ISB engine running at peak performance...
Keep your Hustler Raptor SD mower running at peak performance with this...
Minimize equipment downtime with the reliable 178509 V-Belt, engineered to deliver consistent...
Minimize equipment downtime with the Fan Belt 84331239, engineered for reliable performance...
