Belt Tensioner 3936202 3917485 3964636 for Cummins Engine 4BT 6BT 4B3.9 6B5.9 6C8.3

Product Specifications

Compatible Models

Tired of Belt Slippage and Engine Overheating? Get the Right Cummins Belt Tensioner for Your Hyundai R210LC-7 and R160LC-3

Every hour an excavator sits idle due to a failed belt tensioner costs operators $1,200–$3,500 in lost productivity and rental penalties. Counterfeit or low-tolerance tensioners cause premature belt wear, misalignment, and engine overheating — leading to secondary failures in water pumps and alternators. OEM replacements often take 18–25 days to arrive, halting critical infrastructure projects.

OEM-Equivalent Quality, Ready to Ship from Guangzhou Warehouse

This Cummins belt tensioner is manufactured in ISO 9001-certified facilities and tested under real-world load conditions before shipment. With 10 years of global export experience and over 10,000 SKUs in stock, XUNPO delivers verified replacement parts for Hyundai excavators and Cummins-powered equipment — ensuring uninterrupted operation during engine rebuilds and routine maintenance cycles.

Where This Part Works

This tensioner operates reliably across high-duty construction sites, quarrying operations, port material handling, and demolition jobs where constant vibration, dust ingress, and thermal cycling demand consistent belt preload. In mining-grade excavators like the R210LC-7, it maintains optimal drive-belt tension across ambient temperatures from –20°C to +65°C — preventing slippage during peak hydraulic load and protecting the entire accessory drive system. Cummins 4BT tensioner applications require precise spring force calibration to avoid pulley bearing overload.

Engineering Details That Matter

Forged steel housing ensures dimensional stability under repeated torque loads, unlike cast-aluminum alternatives that warp after 2,000 operating hours. Precision-ground pivot shaft tolerances (±0.015 mm) guarantee smooth rotation without binding — critical for maintaining consistent belt deflection across 100,000+ km of service life. The integrated spring assembly is pre-loaded to 1,250 N ±3% — matching OEM Cummins 6BT engine specifications for proper alternator and water pump engagement. Zinc-nickel electroplated surface finish meets ISO 9227 salt-spray standards (720+ hours), resisting corrosion in coastal and high-humidity environments. All mounting bolt holes are CNC-machined to ISO 2768-mK tolerance, enabling direct interchange with original 3936202 assemblies without adapter plates or shims.

The Real Cost of Wrong Parts

A $28 counterfeit tensioner may save $15 upfront but fails within 300 operating hours — triggering $420 in labor for rework, $890 in replacement belts and pulleys, and $15,000+ in downtime for a single R210LC-7 on a road construction contract. OEM-equivalent parts built to Cummins 6BT engine tensioner specifications reduce total cost of ownership by 41% over three years versus non-compliant alternatives. ISO-certified production, not just packaging labels, ensures compliance with SAE J1332 and Cummins Engineering Standard 400-01-01 for accessory drive systems. Genuine belt tensioner for Hyundai R160LC-3 means guaranteed fit, function, and fatigue resistance — not just appearance.

Why Customers Trust XUNPO

Packaging & Shipping

• Individually sealed in anti-corrosion pouch with molded EPE foam insert inside reinforced kraft box
• In-stock items ship within 2–5 working days after order confirmation
• Flexible logistics: Express (DHL/FedEx/UPS), air freight, or sea freight — quoted per destination
• Real-time tracking provided from Guangzhou warehouse to final delivery address
• MOQ is 1 piece — supports urgent field repairs and diagnostic validation

Get Your Cummins Belt Tensioner Now

Your R210LC-7 won’t wait — and neither should your parts order. Send us the part number (e.g., 3936202), machine model (e.g., R160LC-3), and required quantity. You’ll receive a competitive quote within 24 hours — and if it’s your first order, request a sample for physical verification. Every day delayed is another day of unplanned downtime and revenue loss.

Frequently Asked Questions