ranroswang@hksparkling.com 
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K9007321 Tensioner Belt for Doosan (Develon) DL420 FL, DL450 Wheel Loaders
K9007321 Automatic Belt Tensioner is a premium component exclusively designed for Doosan (Develon) DL420 FL and DL450 wheel loaders. As a critical part of the engine accessory drive system, it automatically maintains consistent belt tension, ensures reliable power transmission to the alternator, water pump and air compressor, and prevents belt slippage, noise and premature wear during heavy-duty material-handling and construction tasks.
Manufacturer: Doosan (Develon)
Function: Automatically adjusts the tension of the engine's poly-V or serpentine belt to ensure power transfer to engine accessories.
Applicable Equipment:
This tensioner is primarily used in the engine groups of Doosan’s heavy-duty wheel loaders:
· DL420 Series: DL420 FL (DTC).
· DL450 Series: DL450 (specifically for S/N 5001 and upwards).
· Engine Reference: Often found in the Alternator & Mounting diagram as component #10.
Dear Valued Partners,
Thank you for choosing SPARKLING MACHINERY for your Doosan (Develon) wheel loader spare parts. The K9007321 TENSIONER;BELT guarantees stable accessory drive operation, minimizing unplanned downtime and maximizing fleet productivity. Our OEM-quality tensioner is built to last in harsh conditions, backed by expert technical support for seamless installation and long-term reliability.
The SPARKLING MACHINERY NEW K9007321 TENSIONER;BELT Photo:
Why Choose the SPARKLING K9007321 TENSIONER;BELT?
- Seamless Fit: OEM-matching dimensions save installation time and labor costs, reducing machine downtime.
- Consistent Tension: Auto-adjustment prevents belt slippage, ensuring full accessory efficiency and extending belt life.
- Rugged Construction: Cast housing and sealed bearing handle heavy vibration and extreme temperatures in construction environments.
- Cost-Effective: Long service life lowers replacement frequency and total ownership costs for your equipment.
- Expert Support: Our Doosan engine specialists offer pre-purchase checks, installation guidance, and post-sales troubleshooting.
About SPARKLING MACHINERY:
- Founded in 2013, SPARKLING focuses on high-quality excavator parts across hydraulics, undercarriage, engines and electrical systems. We prioritize stability, precision and continuous service, offering worldwide distribution, tailored solutions and strict QC to help customers reduce cost and increase uptime.
Get In Touch:
- Replace your failing ECU confidently. Contact SPARKLING for pricing, lead time, and technical support — restore optimal machine control quickly and reliably.
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📦 Packing
1. Packaging methods: Carton box + Wooden case/Pallet + Anti-rust treatment
2. Export-standard packaging to ensure safety during transportation
3. Custom packaging available upon request
4. Dimensions and weight can be provided for freight calculation
🚚 Shipping
1. Available shipping methods: Sea freight, Air freight, Express delivery (DHL, UPS, FedEx, etc.)
2. LCL (Less than Container Load) and FCL (Full Container Load) options are supported
3. For Russian clients, we can introduce the forwarder agent to you
4. Delivery time: Ships within 1-3 working days after payment (for items in stock)
💳 Payment
1. Accepted methods: T/T, Bank Transfer, PayPal, Alipay, WeChat Pay, Western Union
2. Deposit + balance payment available for large or custom orders
3. Flexible payment options—feel free to contact us for details
📌 Frequently Asked Questions (FAQs)
Q: Which excavator models is this part compatible with?
A: This product is compatible with major brands such as CAT, KOMATSU, HITACHI, and more. Custom specifications are also available.
Q: How can I make sure I’m selecting the correct part?
A: You can send us a photo of the old part, part number, or your excavator model, and we will help you confirm the right match.
Q: Is there a warranty for this product?
A: Yes, we offer a 6-month quality guarantee under normal use.
Get a free quote
We are committed to producing the highest quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
Contact us
Email: ranroswang@hksparkling.com
Wechat: +86 136 0901 0879
Skype: foreverlucia1
WhatsApp: +86 136 0901 0879
Address: No. 514-515, Hulin Road, Tianhe District, Guangzhou, China.
Sparkling Machinery Co.,Ltd
foreverlucia1