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VOLVO Automatic Accessory Drive Belt Tensioner 218196817 T034r
FUNCTION
1. Automatic Belt Tension Maintenance: Utilizing a built-in high-strength spring and damping system, the tensioner automatically adjusts the tension of the accessory drive belt in real-time. As the engine operates, the belt undergoes slight length variations due to thermal expansion and contraction, load fluctuations, or wear; this tensioner absorbs these changes to maintain a constant tension force, thereby preventing the belt from becoming loose, slipping, or becoming overtight.
2. Ensuring Proper Drive for Key Accessories: It ensures the multi-ribbed belt correctly drives critical components-enabling the alternator to provide a stable charging voltage, the A/C compressor to deliver effective cooling, the water pump to circulate the cooling system fluid, and the power steering pump to provide steering assistance. This prevents accessory failure (such as a lack of charging, ineffective cooling, or heavy steering) caused by belt slippage.
3. Reducing Vibration, Noise, and Wear: Featuring built-in damping bearings and a shock-absorbing design, the unit absorbs vibrations and impacts generated during belt operation, thereby reducing belt-to-pulley noise. It minimizes lateral belt deviation, tooth skipping, or premature wear, while simultaneously protecting the bearings of associated accessories and extending the overall lifespan of the system.
4. Enhancing Safety and Reliability: Under the demanding conditions typical of heavy-duty trucks-including long-distance travel, heavy loads, and extreme operating environments-the automatic adjustment mechanism eliminates the potential for errors associated with manual adjustments, thereby preventing belt failure that could otherwise lead to engine overheating, alternator failure, or a loss of steering control.
Placement and Operational Flow within the Engine System
1. Location: Situated in the engine's front-end accessory drive area. It is typically mounted on the cylinder block or a dedicated bracket, positioned adjacent to the A/C compressor, alternator, or water pump. It features a grooved pulley around which the drive belt is routed.
2. System Flow: Engine Crankshaft Pulley → Multi-ribbed Belt → Tensioner (applies tension) → Various Accessory Pulleys (alternator, water pump, etc.) → Return Loop.
Advantages
| No. | Advantage Category | Detailed Explanation |
|---|---|---|
| 1 | Automatic Precise Tensioning & Self-Adaptation | Equipped with a high-strength spring mechanism that automatically compensates in real time for belt elongation, thermal expansion/contraction, or wear, maintaining constant optimal tension without any manual adjustment. Adapts across all operating conditions-from cold starts to high-temperature running-ensuring smooth and efficient operation of the accessory drive system (alternator, A/C compressor, water pump, etc.) and significantly reducing failures caused by belt slip or over-tension. |
| 2 | Reduced Noise, Vibration & Wear | Features premium damped bearings and vibration-absorbing design to effectively dampen shocks and vibrations during belt operation. Low rotational resistance, smooth pulley movement without sticking, minimizes belt squealing/squeaking noises, lateral belt drift, and premature wear. Protects bearings of connected accessories (alternator, water pump, etc.) and extends the overall service life of the belt and pulleys (far superior to manual or low-quality tensioners). |
| 3 | High Durability & Reliability | Constructed with high-strength alloy base, heat-resistant polyurethane/rubber damping components, and heavy-duty springs. Withstands high temperatures (engine compartment >100°C), severe vibrations, dust, moisture, and corrosion-specifically engineered for Volvo D13 and similar heavy-duty diesel engines under long-haul, heavy-load, and harsh road conditions. Meets strict OEM testing standards with low failure rate and long service life. |
| 4 | Improved System Efficiency, Safety & Cost-Effectiveness | Maintains ideal belt tension for efficient power transmission with minimal energy loss, indirectly improving fuel economy by reducing parasitic drag. Prevents belt breakage or accessory failure that could cause overheating, charging issues, A/C loss, or steering failure-enhancing driving safety. Requires minimal maintenance (no periodic adjustments), reduces downtime and repair costs, delivering excellent overall value and cost-performance. |
DETAILS
| DESCRIPTION | Automatic Accessory Drive Belt Tensioner | PART NUMBER | 218196817 T034r |
| WEIGHT |
2KG |
VOLUME |
D=70MM L=150mm |
| TRUCK MOLDE | VOLVO | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Common Issues and Replacement Recommendations
1.Symptoms of Failure:Abnormal belt noise (squealing or chirping, particularly during a cold start).
Accessory component failure: Alternator not charging (low voltage), A/C not cooling, or reduced power steering assist.
Worn tensioner pulley bearing, fatigued spring, or pulley wobbling/seizing.
2.Replacement Interval: Proactively every 80,000–120,000 km or 2–3 years (replace concurrently with the belt); replace immediately upon detecting abnormal noise or insufficient belt tension.
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