ranroswang@hksparkling.com 
+86 138 2341 8469
7I-2325 Flywheel Coupling for Caterpillar 307 and 307B Mini Excavators
Function: It often serves as a flexible coupling between the engine and the hydraulic pump or within the final drive/travel motor assembly. Its role is to dampen vibrations, absorb shock loads, and compensate for minor shaft misalignment.
Compatible Models: It is primarily used in Cat 307 and 307B mini excavator series.
Specifications: It is a relatively small part, weighing approximately 0.2 kg.
Thank you for choosing SPARKLING MACHINERY, your trusted supplier of CAT mini excavator parts. The 7I-2325 coupling is a small but vital link between engine and hydraulic pump on 307/307B. Made from durable steel with precise splines, it ensures reliable torque transfer and vibration reduction. Ideal for OEM replacement or pump service, it restores machine performance and prevents costly downtime.
The SPARKLING MACHINERY NEW 7I-2325 coupling Photo:
Why Choose the SPARKLING 7I-2325 coupling?
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- Vibration Dampening: Constructed with specialized composite materials to reduce harmonic vibration from the engine to the hydraulic pump.
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- High Torque Resistance: Built to handle the peak breakout forces and hydraulic pressures typical of the 307 and 307B models.
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- Heat Resistant: Capable of maintaining structural integrity within the high-temperature environment of the engine compartment.
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- Direct Fit: Manufactured to exact OEM dimensions for quick installation and perfect alignment on the flywheel.
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Related Maintenance Parts for CAT 307 Series
When replacing the coupling, it is highly recommended to inspect and replace the following high-wear maintenance items:
| Part Name | CAT 307 / 307B Part Number | System Application |
| Main Coupling | 7I-2325 | Engine to Pump Drive |
| Engine Oil Filter | 1R-0739 | Engine Lubrication |
| Fuel Filter | 1R-0712 | Fuel System Protection |
| Hydraulic Return Filter | 093-7521 | Hydraulic Tank |
| Air Filter (Primary) | 131-8902 | Engine Air Intake |
Q&A Section
Q1: How do I know if my 7I-2325 coupling is failing?
A: Common symptoms include loud rattling or clunking noises between the engine and pump, increased vibration, or a sudden loss of hydraulic power despite the engine running.
Q2: Does this coupling fit the CAT 307C or 307D models?
A: No. The 7I-2325 is specifically for the 307 and 307B models. Later generations (C and D series) often use different coupling designs (such as the 165-series or 242-series).
Q3: Can I replace this coupling without removing the engine?
A: In most cases, you can access the coupling by sliding the hydraulic pump back away from the engine flywheel. While the engine stays in place, the pump must be unbolted and supported.
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
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Whatsapp: +8613609010879