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Dongfeng Cummins Idler Pulley Assembly 5664883/5664884 for ISD Series Diesel Engines
FUNCTION
1. Belt Routing Function: Alters the path of the engine's Poly-V belt, enabling it to accurately navigate around various accessory pulleys-such as the alternator, water pump, A/C compressor, and power steering pump-thereby establishing an optimal belt drive layout.
2. Belt Tensioning and Stabilization: Works in conjunction with the tensioner pulley to maintain appropriate belt tension, minimizing belt flutter, vibration, and lateral deviation during high-speed operation to ensure smooth power transmission.
3. Reduced Belt Wear and Noise: Facilitates a smooth belt transition via a smooth or grooved pulley surface, thereby lowering frictional resistance between the belt and the pulley; this extends the belt's service life and effectively reduces noise generated by the drive system.
4. Ensures Proper Operation of Engine Accessories: Guarantees that critical accessories-including the alternator, water pump, power steering pump, and A/C compressor-receive continuous and stable power input, thereby sustaining the engine's normal operation and the vehicle's various functional systems.
Working Principle
1. Belt Routing Guidance: The engine crankshaft transmits power via the main pulley, and the multi-ribbed belt must navigate around various accessories during operation. Idler pulleys are strategically positioned along the belt's path to redirect its course, ensuring the belt smoothly wraps around each accessory pulley and follows the correct transmission route.
2. Maintaining Belt Tension and Stability: Working in conjunction with dedicated tensioners, idler pulleys-through their fixed positioning and smooth surface-exert a specific supporting force on the belt. This prevents the belt from bouncing, fluttering, or drifting laterally during high-speed rotation.
3. Reducing Friction and Vibration: The idler pulley houses high-precision rolling bearings, allowing the pulley body to rotate freely. As the belt operates at high speeds, the idler pulley rotates synchronously with it, significantly reducing sliding friction between the belt and the pulley while simultaneously absorbing a portion of the vibrations, thereby keeping the transmission system running smoothly and quietly.
4. Power Transmission Assistance: The idler pulley itself does not drive any components; it serves solely as a passive guide and support mechanism. Its function is to ensure uniform tension throughout the entire belt system and to guarantee that each accessory receives a stable input of power.
Advantages
| No. | Performance Advantage | Specific Description |
|---|---|---|
| 1 | Smooth Operation & Low Noise | Built-in high-precision sealed bearing results in low rotational resistance, minimal vibration, and low noise at high speeds |
| 2 | High Temperature & Wear Resistance | Made of premium steel and high-temperature bearings, suitable for the hot and high-speed environment of the engine compartment with long service life |
| 3 | Stable Belt Guidance | Effectively changes belt direction, reduces belt jumping, misalignment, and side wear, extending the service life of the poly-V belt |
Interfacing Relationships
Location on the Engine: Situated within the path of the Poly-V belt, typically positioned between accessory pulleys-such as those for the alternator, water pump, power steering pump, and A/C compressor-where it serves to alter the belt's routing.
DETAILS
| DESCRIPTION | Idler Pulley Assembly | PART NUMBER | 5664883/5664884 |
| WEIGHT |
1KG |
VOLUME |
10 × 10 × 10 cm |
| TRUCK MOLDE | SINOTRUK | 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 |
Daily Maintenance Suggestions
| Maintenance Item | Maintenance Interval | Specific Content and Recommendations |
|---|---|---|
| Noise Inspection | Daily (after starting) | Listen carefully for squealing, whining, clicking, or grinding noises from the front of the engine (typical signs of bearing failure) |
| Visual & Wobble Check | Daily (before operation) | Inspect the idler pulley for obvious wobbling, cracks, belt misalignment, or oil contamination |
| Poly-V Belt Condition Check | Daily / per shift | Check the belt for cracking, wear, edge fraying, aging, or insufficient tension |
| Oil Contamination Check | During daily use | Keep the engine compartment clean to prevent oil from splashing onto the idler pulley and belt |
| Rotation Flexibility Check | Every 5,000–10,000 km | After releasing the belt, manually rotate the idler pulley to check for smooth movement, no sticking, and no excessive play |
| Mounting Bolt Check | Every 250–500 working hours | Check if the idler pulley mounting bolts are loose and retighten to the specified torque if necessary |
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