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Reliable power transmission to engine accessories is crucial for heavy-duty truck operation. As a vital component among genuine Sinotruk howo parts, the Accessory Strap, identified by OEM numbers 3972375 / 8PK2135, is essential for driving critical systems. This multi-ribbed strap transmits rotational power from the crankshaft to components like the alternator and water pump. The genuine 3972375 / 8PK2135 ensures efficient operation and prevents slippage under high loads. It is engineered for durability and reliable performance in demanding conditions.
Accessory Strap
Ремень привода агрегатов
Correa de accesorios
The Accessory Strap, part numbers 3972375 / 8PK2135, is a multi-ribbed serpentine belt. It routes around multiple pulleys on the engine’s front. Its primary function is to drive all belt-driven accessories from one power source. The crankshaft pulley provides rotational force.
The strap 3972375 / 8PK2135 turns the alternator to charge the battery. It drives the water pump to circulate engine coolant. It powers the power steering pump for steering assist. It often runs the air compressor for the braking system.
This single-strap design is efficient and reliable. The genuine 3972375 / 8PK2135 replaces multiple V-belts. It requires proper tension to function correctly. A failed strap leads to immediate loss of multiple vehicle systems.
High Grip Multi-Rib Design
The 8PK2135 profile provides a large contact area with pulleys. This prevents slippage and ensures efficient power transfer to all driven components.
Heat and Oil Resistance
Made from advanced EPDM rubber, the strap resists cracking from under-hood heat. It also withstands degradation from minor oil exposure.
Quiet and Smooth Operation
Precision manufacturing ensures even tension distribution. This minimizes noise and vibration for a smoother engine compartment.
Extended Service Life
The genuine 3972375 / 8PK2135 is built to last. Reinforced tensile cords resist stretching and fatigue over thousands of miles.
| Parameter / Feature | Specification / Description |
|---|---|
| OEM Part Number | 3972375 / 8PK2135 |
| Component Name | Accessory Strap (Serpentine Belt, Fan Belt) |
| Brand & Application | SINOTRUK Howo, drives alternator, water pump, power steering, air compressor. |
| Strap Type | Multi-Rib (Poly-V) Serpentine Belt. |
| Profile | 8PK (8 ribs, K-profile dimensions). |
| Effective Length | 2135 mm (as denoted by 8PK2135). |
| Material | High-grade EPDM rubber with polyester tensile cords. |
| Temperature Range | Designed for extreme under-hood temperatures. |
| Product Condition | New, 100% Genuine OEM Part. |
A worn accessory strap, part 3972375 / 8PK2135, shows clear visual and audible warnings. Squealing noises at startup or during steering are common. This indicates glazing or loss of grip on the pulleys.
Visible cracks on the ribbed side of the strap are a major red flag. These are often called “dry rot” cracks. Fraying along the edges or missing pieces of ribs indicate advanced wear. A shiny appearance suggests slippage.
Functional symptoms include dimming headlights. This points to alternator undercharging. Overheating may occur if the water pump is not spinning correctly. Loss of power steering assist is another serious sign.
Regular inspection of the 3972375 / 8PK2135 strap is crucial. Catching wear early prevents a sudden breakdown. A snapped strap disables multiple systems simultaneously. This can leave the truck stranded.
Replacing the serpentine strap is a standard maintenance task. First, locate the strap routing diagram. This shows the correct path for the 3972375 / 8PK2135 around all pulleys.
Most SINOTRUK Howo models use an automatic tensioner. Use a breaker bar on the tensioner pulley’s square bolt. Rotate the tensioner to release pressure and slip the old strap off. Note the exact routing before removal.
Route the new genuine 3972375 / 8PK2135 strap according to the diagram. Ensure it sits correctly in all pulley grooves. Release the tensioner slowly to apply tension. The automatic tensioner sets the correct preload.
For manual tensioners, adjust to the specified deflection. Start the engine and let it run. Recheck tension and visually confirm the strap tracks straight. Proper installation ensures longevity.
The accessory strap is a wear item with a finite service life. Proactive replacement is more economical than a roadside failure. Check the strap 3972375 / 8PK2135 during routine maintenance.
Look for the warning signs mentioned earlier. Also, check the condition of all pulleys and the tensioner. A misaligned or seized pulley will destroy a new strap quickly. Address any oil leaks from the engine.
Following the manufacturer’s recommended replacement interval is essential. Even if it looks okay, the internal cords may be fatigued. Replacing the 3972375 / 8PK2135 strap preventively ensures uninterrupted operation.
The genuine 3972375 / 8PK2135 strap is manufactured to exact length and profile specifications. It ensures perfect fitment on all pulleys. Incorrect length causes improper tension and rapid failure.
The rubber compound is formulated for OEM durability and flexibility. Non-genuine straps may use inferior materials that crack prematurely. The rib profile must match the pulley grooves precisely.
Using the correct part, 3972375 / 8PK2135, guarantees the strap will work with the vehicle’s automatic tensioner system. It is a simple component where quality directly translates to reliability.
The Accessory Strap, OEM numbers 3972375 / 8PK2135, is the essential link that powers your truck’s critical support systems. Its failure has immediate and severe consequences for vehicle operation.
Investing in the genuine 3972375 / 8PK2135 strap guarantees the correct fit, material quality, and performance needed for heavy-duty service. Maintain the reliability of your SINOTRUK Howo by using authentic OEM parts.
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