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Mr. Perry Wu International Sales Director
Cummins Engine Belt Tensioner 3973820 / 3287277 | Heavy Duty Belt Tensioner Assembly
The 3973820 / 3287277 belt tensioner assembly is an important component of the engine accessory drive system for Cummins diesel engines.
Its main function is to maintain proper tension on the drive belt, ensuring stable operation of engine accessories such as the alternator, water pump, air conditioning compressor, and other belt-driven components.
A properly functioning belt tensioner helps reduce belt slippage, vibration, and abnormal noise, improving overall engine system reliability and extending belt service life.
This belt tensioner is widely used in heavy-duty trucks, buses, industrial diesel engines, and construction machinery applications.
Its main function is to maintain proper tension on the drive belt, ensuring stable operation of engine accessories such as the alternator, water pump, air conditioning compressor, and other belt-driven components.
A properly functioning belt tensioner helps reduce belt slippage, vibration, and abnormal noise, improving overall engine system reliability and extending belt service life.
This belt tensioner is widely used in heavy-duty trucks, buses, industrial diesel engines, and construction machinery applications.
Applications
● Cummins ISB diesel engines
● Cummins ISC diesel engines
● Cummins 6CT diesel engines
● Cummins QSL / ISL applications
● Heavy-duty trucks and buses
● Cummins ISC diesel engines
● Cummins 6CT diesel engines
● Cummins QSL / ISL applications
● Heavy-duty trucks and buses
Product Advantages
● Maintains Proper Belt Tension
Automatically maintains stable tension on the drive belt, helping ensure smooth operation of engine accessories.
● Reduces Belt Slippage and Noise
Helps minimize belt vibration, squeaking, and slippage during engine operation.
● Improves Belt Service Life
Stable belt tension helps reduce uneven belt wear and extends the lifespan of the belt system.
● Durable Metal Construction
Manufactured with durable metal materials for reliable performance under heavy-duty working conditions.
● OEM Standard
Manufactured to meet original equipment specifications for direct replacement.
Technical Specifications
|
Item |
Specification |
|
Item Name |
Engine Belt Tensioner |
|
Part Number |
3973820 / 3287277 |
|
Application |
Cummins Diesel Engine |
|
Suitable Engine |
ISB / ISC / 6CT / QSL / ISL applications |
|
Type |
Belt Tensioner Assembly |
|
Material |
Metal / Steel Assembly |
|
Condition |
New |
|
Quality |
OEM Quality Replacement |
|
Packaging |
Original Packing / Neutral Packing |
|
Warranty |
6 Months |
|
Place of Origin |
China |
Function
The belt tensioner is responsible for maintaining the correct tension of the serpentine or accessory drive belt during engine operation.
It uses an internal spring mechanism to automatically adjust belt tension as the belt stretches over time, ensuring continuous and stable contact between the belt and pulleys.
A properly functioning tensioner helps prevent belt slipping, excessive vibration, abnormal noise, and accessory drive failure.
In heavy-duty diesel engines, the belt tensioner plays an important role in maintaining reliable operation of the alternator, water pump, air compressor, and other engine accessories.
It uses an internal spring mechanism to automatically adjust belt tension as the belt stretches over time, ensuring continuous and stable contact between the belt and pulleys.
A properly functioning tensioner helps prevent belt slipping, excessive vibration, abnormal noise, and accessory drive failure.
In heavy-duty diesel engines, the belt tensioner plays an important role in maintaining reliable operation of the alternator, water pump, air compressor, and other engine accessories.
Packaging & Delivery
● Standard export carton or customized packaging
● Delivery time: 3–10 days
● Shipping: Sea / Air / Express
● Payment: T/T, L/C, Western Union
● Delivery time: 3–10 days
● Shipping: Sea / Air / Express
● Payment: T/T, L/C, Western Union
FAQ
Q1: What is your terms of packing?
A: Generally, we pack you goods use factory packing box or neutral boxes.
Q2: What is your terms of payment?
A: By TT. We'll show you the photos of the products and packages before you pay the balance.
Q3: How about your delivery time?
A: Generally, it will take 3 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q4: How do you make a price offer and how long is its validity?
A: We usually quote within 24 hours by email after we get your inquiry . If you are very urgent to get the price,please call us or tell us in your email so that we will regard your inquiry priority. The price valid with 30 days.
Q5: What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q6: Do you accept third party inspection?
A: Yes, we do.
Q7: Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.
Q8: How do you make our business long-term and good relationship?
A: 1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them.
Q9: How to guarantee your after-sales service?
A: 1. Strict inspection during production;
2. Strictly check the products before shipment to ensure our packaging in good condition;
3. Track and receive feedback from customer regularly.
A: Generally, we pack you goods use factory packing box or neutral boxes.
Q2: What is your terms of payment?
A: By TT. We'll show you the photos of the products and packages before you pay the balance.
Q3: How about your delivery time?
A: Generally, it will take 3 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q4: How do you make a price offer and how long is its validity?
A: We usually quote within 24 hours by email after we get your inquiry . If you are very urgent to get the price,please call us or tell us in your email so that we will regard your inquiry priority. The price valid with 30 days.
Q5: What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q6: Do you accept third party inspection?
A: Yes, we do.
Q7: Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.
Q8: How do you make our business long-term and good relationship?
A: 1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them.
Q9: How to guarantee your after-sales service?
A: 1. Strict inspection during production;
2. Strictly check the products before shipment to ensure our packaging in good condition;
3. Track and receive feedback from customer regularly.