<p>Stop unexpected alternator belt slippage and premature wear on your Cummins ISB6.7, ISC8.3, or QSB6.7 engine — this direct-fit <strong>Cummins alternator pulley 3926858</strong> delivers OEM-equivalent grip and alignment right out of the box.</p> <ul> <li>Replaces part numbers 3926858, 3965146, and 3965147 — verified fit for CM2250/CM2350/CM2380 engine families with correct hub depth and bore tolerance</li> <li>Eliminates downtime from counterfeit pulleys that lack proper harmonic damping grooves — a critical detail often missed in low-cost copies</li> <li>Ships same-day from our Guangzhou warehouse when ordered before 3 PM CST (MOQ just 1 piece)</li> <li>Backed by 6-month warranty and real-time technical support — because getting the right pulley shouldn’t mean guessing or waiting</li> </ul>
| Parameter | Details |
|---|---|
| Part Name | Alternator Pulley |
| Part Number (OEM Reference) | 3926858, 3965146, 3965147 |
| Brand Compatibility | Cummins |
| Compatible Engine Models | ISB6.7, ISC8.3, QSB6.7, 6B5.9, 6C8.3, B3.3, B4.5, B6.7 CM2350 B121B/B136C/B157C, B6.7 CM2450 B155B, B6.7N CM2380 B150B, B6.7O CM3580 B193B, C GAS PLUS CM556, G5.9, G8.3, GTA8.3 CM558, ISB CM2150/E, ISB6.7 CM2250/CM2350 B101, ISB6.7 G CM2180 B118, ISBE4 CM850, ISC CM2150/554/850, ISC8.3 CM2250/G CM2180 C101, ISL CM2150/554/850, ISL G CM2180, ISL9 CM2150 SN/2250/2350 L101/L111/L102/L118, ISLE4 CM850, L GAS PLUS CM556, L8.9 L121, L9 CM2350 L116B/L119B/L120C/L129C/L133C, L9 CM2450 L126B/L143C, L9N CM2380 L124B/L130B, N14 MECHANICAL, QSB3.3 CM2150, QSB6.7 CM2250/EC/B128/M CM2250, QSB6.7 CM2350 B105/B112/B130, QSB6.7 CM850(CM2850), QSC8.3 CM554/CM850(CM2850), QSC9 CM2250/QSL9 CM2250, QSJ8.9 G, QSL9 CM2250/L115/CM2350 L102/L107/L118/CM554/CM850(CM2850)/G CM558/M CM2250 L106 |
| Material | High-strength forged steel with precision-machined groove profile |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| Packaging | Individual blister pack + anti-rust paper + reinforced corrugated box |
| Brand | Applicable Models |
|---|---|
| Cummins | ISB6.7, ISC8.3, QSB6.7, ISB, ISC, QSB, QSC, QSL, ISL, ISLE4, L9, L9N, B6.7, B4.5, B3.3, 6B5.9, 6C8.3, GTA8.3, C Gas Plus, L Gas Plus, N14 |
Every unscheduled shutdown due to alternator pulley failure costs fleet operators thousands in lost productivity — especially during critical infrastructure projects or mining cycles. OEM pulleys cost up to 45% more and take 3 weeks to arrive. Counterfeit 3926858 pulleys lack proper heat treatment and groove geometry, causing belt misalignment, voltage drop, and repeated alternator replacement. Sourcing from multiple vendors for different Cummins engine platforms adds complexity and delays.
This Cummins alternator pulley 3926858 is manufactured in ISO 9001-certified facilities and tested for concentricity, surface hardness (HRC 52–56), and groove tolerance (±0.05 mm) before shipment. With 10 years of global export experience and a 10,000+ SKU warehouse in Guangzhou, we deliver direct-fit replacements for ISB6.7, ISC8.3, and QSB6.7 engines within 2–5 working days — no waiting for overseas production cycles. Technicians installing this part report consistent tension retention and zero belt walk during high-load generator operation.
This Cummins engine alternator pulley for ISB6.7 ISC8.3 QSB6.7 is engineered for continuous-duty environments: construction sites with daily 12+ hour operation, quarries subject to dust and vibration, port material handlers running auxiliary power systems, and municipal fleet maintenance shops servicing diesel-powered utility vehicles. Under sustained load, the pulley must maintain precise rotational balance to prevent harmonic resonance in the front-end accessory drive — a common cause of premature bearing wear in alternators and water pumps.
The pulley’s forged steel core provides superior fatigue resistance over cast alternatives, critical for engines operating above 2,200 RPM. Its precisely ground V-groove ensures optimal belt contact angle and lateral stability — reducing slippage risk by 70% compared to non-spec aftermarket units. Surface hardness (HRC 52–56) is verified per ASTM E18, preventing micro-pitting under long-term belt tension. Dimensional tolerances are held to ±0.05 mm on bore diameter and face runout, guaranteeing seamless interchangeability with original Cummins assemblies without shim adjustments or alignment tools.
A $25 counterfeit pulley may save upfront, but leads to $320 in labor for repeated alternator replacement, $180 in new belts, and $1,200+ in downtime per incident — based on industry TCO data from North American fleet managers. Non-compliant units fail to meet Cummins’ torque transfer specs (ISO 11277), accelerating wear on crankshaft dampers and serpentine belt tensioners. Our Cummins 3926858 pulley meets OEM-equivalent performance standards validated through 100% pre-shipment rotational testing at 3,500 RPM under simulated load — ensuring reliability you can calculate into your maintenance budget.
We partner exclusively with ISO 9001-certified factories and perform incoming material inspection on every batch. Each Cummins alternator pulley undergoes full functional testing before shipping — including dynamic balance, groove geometry scan, and tensile strength verification. All parts carry a 3–12 month warranty covering manufacturing defects. With 10 years exporting to 120+ countries and a team of 20+ technical specialists, we’ve supported over 4,200 repair centers and fleet operators since 2016. You’ll receive professional part confirmation within 2 hours of inquiry, and our Guangzhou warehouse holds 10,000+ SKUs ready for same-day dispatch.
Your excavator or truck isn’t generating revenue while it’s down. Every hour delayed in replacing a worn 3926858 pulley increases risk of total charging system failure. Send us your machine model, quantity, and destination — we’ll reply with a competitive quote within 24 hours. First-time buyers can request a sample for physical verification before placing bulk orders.
Q: Is this an original Cummins part or an aftermarket replacement?
A: This is an OEM-equivalent aftermarket alternator pulley, produced in ISO 9001-certified factories to match Cummins’ dimensional, material, and performance specifications.
Q: How do I confirm if this fits my specific Cummins engine?
A: Provide your exact engine model (e.g., ISB6.7 CM2350 B136C) or equipment serial number — our technical team will verify compatibility and respond within 2 hours.
Q: What is your warranty policy?
A: We offer a 3–12 month warranty against manufacturing defects. If failure occurs due to material or workmanship, we provide free replacement or refund.
Q: What is the minimum order quantity?
A: MOQ is 1 piece — designed for urgent maintenance and pilot testing.
Q: How fast can I receive the part after ordering?
A: In-stock items ship within 2–5 working days. Express shipping options available for urgent deliveries.
Q: Can I request a sample before placing a bulk order?
A: Yes — first-time clients may request a sample for physical evaluation and fit-check prior to bulk purchase.
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WhatsApp: +86 187 2205 7128 | Email: talos@xunpojx.com
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