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128170-77350E Alternator Belt for Yanmar 1GM 1GM10 1GM10C 1GM10L 1GML | JLM Marine
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128170-77350E Alternator Belt for Yanmar 1GM 1GM10 1GM10C 1GM10L 1GML
This alternator belt is engineered to fit a range of Yanmar 1GM series marine diesel engines, including the 1GM, 1GM10, 1GM10C, 1GM10L, 1GM10(YMI), and 1GML models. Designed to deliver reliable performance in demanding marine environments, this belt ensures consistent alternator operation and electrical system performance.
This replacement belt serves as a direct alternative to OEM part numbers 128170-77350 and 128170-77350E, providing a dependable solution for maintaining your Yanmar engine's charging system.
- Direct replacement for Yanmar OEM alternator belts
- Precision-engineered for 1GM series marine diesel engines
- Ensures proper alternator drive and battery charging
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Yanmar | 128170-77350 | OEM part number |
| Yanmar | 128170-77350E | OEM part number |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model |
|---|---|
| Yanmar | 1GM |
| Yanmar | 1GM10 |
| Yanmar | 1GM10(YMI) |
| Yanmar | 1GM10C |
| Yanmar | 1GM10L |
| Yanmar | 1GML |
Technical Specifications
| Specification | Value |
|---|---|
| OEM Number | 128170-77350E |
| Component Type | Alternator Belt |
| Application | Yanmar 1GM Series Marine Diesel Engines |
Package Contents
Your order includes:
- 1 × Alternator Belt
Installation Guide
- Disconnect the negative battery cable to prevent electrical hazards during installation.
- Locate the alternator on your Yanmar engine and identify the belt routing path.
- Loosen the alternator mounting bolts to create slack in the old belt. You may need to pivot the alternator toward the engine block.
- Remove the old alternator belt from the pulleys, noting the routing pattern for reference.
- Position the new alternator belt around the crankshaft pulley and alternator pulley following the original routing.
- Pivot the alternator away from the engine to apply proper tension to the belt. The belt should deflect approximately 10–15 mm (3/8–5/8 inch) under moderate thumb pressure at its midpoint.
- Tighten the alternator mounting bolts securely while maintaining proper belt tension.
- Reconnect the negative battery cable and start the engine to verify proper belt operation.
- Check for unusual noise, vibration, or slippage during the initial run. Re-check belt tension after the first hour of operation.
Troubleshooting & FAQ
Q: How do I confirm this alternator belt fits my Yanmar engine?
A: Cross-reference your engine model with the compatibility table above. This belt fits 1GM, 1GM10, 1GM10C, 1GM10L, 1GM10(YMI), and 1GML models. Verify your original part number matches 128170-77350 or 128170-77350E.
Q: How often should I replace the alternator belt?
A: Inspect your alternator belt every 100 operating hours or annually. Replace it if you notice cracking, glazing, fraying, or excessive wear. Most belts should be replaced every 2–3 years or sooner if signs of deterioration appear.
Q: What are the signs that my alternator belt is failing?
A: Common symptoms include squealing noises (especially during startup or under load), dimming lights, battery warning light illumination, visible cracks or glazing on the belt surface, or battery discharge issues.
Q: How tight should the alternator belt be?
A: Proper tension allows 10–15 mm (3/8–5/8 inch) of deflection when moderate thumb pressure is applied at the belt's midpoint. Too loose causes slippage and poor charging; too tight causes premature bearing wear.
Q: Is this an OEM belt or an aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
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Для наших типичных клиентов из США и Канады сроки доставки следующие:
- Amazon FBA : заказы будут доставлены в течение 1–5 рабочих дней после размещения заказа (в определенные особые периоды, такие как крупные акции, Рождество и т. д., время доставки Amazon FBA может быть изменено).
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Когда вы размещаете заказ, мы оценим даты отправки и доставки для вас на основе доступности ваших товаров и выбранных вами вариантов доставки. В зависимости от выбранного вами поставщика услуг доставки, предполагаемые даты доставки могут отображаться на странице расценок на доставку.
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Основанная в 2002 году, компания JLM Marine зарекомендовала себя как специализированный производитель высококачественных морских деталей, базирующийся в Китае. Наша приверженность совершенству в производстве заслужила нам доверие ведущих мировых морских брендов.
Как прямой поставщик, мы обходим посредников, что позволяет нам предлагать конкурентоспособные цены без ущерба качеству. Такой подход не только поддерживает экономическую эффективность, но и гарантирует, что наши клиенты получают наилучшую ценность напрямую от источника.
Мы рады расширить свое присутствие через розничные каналы, предлагая наш опыт и приверженность качеству непосредственно владельцам и любителям лодок по всему миру.
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