<p>Stop downtime from fan belt slippage or misalignment — this <strong>fan pulley 3914458</strong> delivers OEM-equivalent concentricity and hub runout tolerance (≤0.05mm) for smooth, vibration-free operation on Cummins ISB and QSB engines.</p> <ul> <li>Fits 12+ Cummins engine variants — including ISBE CM800, QSB4.5 CM2850, and legacy 6B5.9/6C8.3 — no guesswork on cross-compatibility</li> <li>Direct replacement with factory-spec bore diameter (Φ35.00±0.01mm) and keyway depth — eliminates adapter kits and machining</li> <li>Ships same-day from our Guangzhou warehouse when ordered before 3 PM CST — no 2–4 week OEM waits</li> <li>Backed by XUNPO’s 12-month warranty against material or workmanship defects — because your uptime shouldn’t hinge on a pulley</li> </ul>
| Parameter | Details |
|---|---|
| Part Name | Fan Pulley |
| Part Number (OEM Reference) | 3914458 |
| Brand Compatibility | Cummins |
| Engine Model Fitment | ISB, QSB, 6CTA, ISC, QSC, 4B3.9, 6B5.9, 6C8.3, B3.9 G, B4.5, B5.9 G, G5.9, G5.9 CM558, ISB CM550, ISB CM850, ISBE CM800, ISBE4 CM850, QSB4.5 CM850(CM2850) |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| Packaging | Individual protective packaging with foam cushioning and sturdy export carton |
| Brand | Applicable Models |
|---|---|
| Cummins | ISB, QSB, 6CTA, ISC, QSC, 4B3.9, 6B5.9, 6C8.3, B3.9 G, B4.5, B5.9 G, G5.9, G5.9 CM558, ISB CM550, ISB CM850, ISBE CM800, ISBE4 CM850, QSB4.5 CM850(CM2850) |
Every unscheduled downtime on a construction site or quarry costs hundreds to thousands of USD per hour. A failed fan pulley 3914458 can cause belt slippage, overheating, and catastrophic engine failure — especially under high-load, high-temperature operation. Many operators waste weeks waiting for OEM replacements or risk counterfeit parts that last less than half the service life.
This fan pulley 3914458 is manufactured in ISO-certified factories and undergoes pre-shipment performance testing for torque transfer stability, concentricity, and thermal resistance. With 10 years’ experience supplying replacement fan pulley for QSB engine and ISB applications globally, XUNPO delivers consistent fit and function — whether you’re repairing a 6B5.9-powered loader or overhauling an ISBE CM800 in a mining fleet.
This fan pulley operates in demanding environments: earthmoving excavators on Middle Eastern construction sites, quarry trucks in South Africa, port cranes in Rotterdam, and demolition rigs across North America. It directly drives the cooling fan assembly — critical for maintaining optimal coolant and oil temperatures during continuous high-RPM operation. Selecting the correct 3914458 fan pulley for Cummins ISBE CM800 ensures stable belt tension, reduced vibration, and reliable heat dissipation.
Forged steel construction provides superior tensile strength and fatigue resistance compared to cast alternatives — essential for engines operating at sustained 2,500+ RPM. Precision-machined bore and keyway ensure exact alignment with the water pump shaft, minimizing runout (<0.05 mm) and preventing premature bearing wear. Surface-hardened teeth resist abrasion from poly-V belts, extending service intervals by up to 40% versus non-treated equivalents. Dimensional tolerances comply with Cummins engineering drawings for ISB and QSB platforms, guaranteeing drop-in compatibility without modification.
A $25 counterfeit fan pulley may seem economical — but it often fails within 300–500 operating hours, triggering secondary damage to belts, water pumps, and radiators. The resulting downtime, labor, and emergency freight costs easily exceed $1,200 per incident. Genuine-equivalent parts like this 3914458 fan pulley for Cummins ISBE CM800 meet ISO 9001 and OEM dimensional/functional standards, delivering predictable 5,000+ hour service life and lowering total cost of ownership (TCO) by 37% over three years — verified across 120+ customer fleets.
Only ISO 9001-certified factories supply our fan pulleys — incoming raw materials are inspected batch-by-batch for alloy composition and hardness. Every unit undergoes 100% functional testing for rotational balance and load-bearing capacity before shipment. We offer 3–12 month warranty covering manufacturing defects — no questions asked. Our 10-year export track record spans 120+ countries, backed by 20+ in-house engineers who verify part compatibility within 2 hours. Over 10,000 SKUs are held in stock at our Guangzhou warehouse, enabling 2–5 working day dispatch on all in-stock items including fan pulley 3914458.
Your equipment isn’t generating revenue while it’s idle. Send us your part number (3914458), engine model (e.g., QSB4.5 CM850), and required quantity — we’ll reply with a competitive quote within 24 hours. First-time buyers may request a sample for testing. Stock is ready; your next repair starts now.
Q: Is this an original Cummins part or a replacement?
A: This is an OEM-equivalent aftermarket fan pulley, produced in ISO 9001-certified factories to match Cummins specifications for fit, form, and function.
Q: How do I confirm if this fan pulley 3914458 fits my machine?
A: Provide your engine serial number or full model designation (e.g., ISBE CM800 or QSB4.5 CM2850); our technical team will verify compatibility and respond within 2 hours.
Q: What is the warranty period?
A: 3–12 months against manufacturing defects — full replacement or refund with no conditions.
Q: What is the minimum order quantity?
A: 1 piece — no bulk requirement, supporting urgent maintenance and small repair shops.
Q: How long does shipping take?
A: In-stock items ship from Guangzhou within 2–5 working days. Express options deliver to most destinations in 3–7 business days.
Q: Can I receive a sample before placing a bulk order?
A: Yes — first-time customers may request one sample of fan pulley 3914458 for evaluation and fit testing.
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WhatsApp: +86 187 2205 7128 | Email: talos@xunpojx.com
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