ranroswang@hksparkling.com 
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7I-2331 Hydraulic Pump Drive Shaft for Caterpillar 320B, 320C, 320D Excavators
The 7I-2331 Shaft is a critical drivetrain component specifically engineered for the hydraulic pump and gear pump assemblies within Caterpillar (CAT) 320B, 320C, and 320D series excavators. This shaft is primarily utilized in the auxiliary or pilot gear pumps (often the Parker/Commercial Intertech style) that support the main hydraulic system.
Equipment Compatibility:
· Commonly used in CAT 320B, 320C, and 320D series excavators.
· It typically serves as the link for the pilot pump or auxiliary gear pump mounted on the rear of the main hydraulic pump.
Dimensions (14/20/180):
· 14 Teeth: Spline count.
· 20: Shaft diameter.
· 180: Overall length of 180mm.
Thank you for choosing SPARKLING MACHINERY, your reliable supplier of CAT hydraulic parts. The 7I-2331 drive shaft is the critical link between engine and main pump on 320B/C/D excavators. Made from high-grade alloy steel with precision heat treatment, it delivers superior torque resistance, wear stability, and long service life. Perfect for OEM replacement or pump overhaul, it helps restore full machine power and avoid costly downtime.
The SPARKLING MACHINERY NEW 7I-2331 Hydraulic Pump Drive Shaft Photo:
Why Choose the SPARKLING 7I-2331 Hydraulic Pump Drive Shaft?
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- OEM Compatibility: Perfectly matched to the gear pump housings of CAT 320B/C/D models for seamless installation.
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- Hardened Steel Construction: Features case-hardened surfaces to minimize wear at the bearing and seal contact points.
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- Spline Precision: Engineered with high-tolerance splines to ensure tight engagement and prevent power loss or "play" in the pump.
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- High Torque Resistance: Specifically treated to prevent shaft twisting or shearing under peak hydraulic loads.
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Common Maintenance Parts for CAT 320 Series
When servicing the pump shaft, it is recommended to inspect the following related components:
| Part Name | CAT 320C Part Number | Application |
| Drive Shaft | 7I-2331 | Pilot/Auxiliary Gear Pump |
| Shaft Seal | 151-3430 | Main Pump Seal Group |
| Engine Oil Filter | 1R-1808 | 3066/C6.4 Engine |
| Fuel Filter | 1R-0749 | Fuel System Protection |
| Hydraulic Return Filter | 179-9806 | Hydraulic Tank Maintenance |
Q&A Section
Q1: Does the 7I-2331 shaft fit all CAT 320 series models?
A: It is standard for the B, C, and D series auxiliary pumps. However, always verify the pump manufacturer (e.g., Parker/Commercial) as some specialized configurations may vary.
Q2: What causes the 7I-2331 shaft to fail?
A: Failure is usually caused by contaminated hydraulic oil (causing friction wear), bearing seizure, or extreme pressure spikes that exceed the material's shear strength.
Q3: Can I install this shaft without special tools?
A: Installation requires standard mechanic tools, but a hydraulic press may be necessary if the gear set needs to be removed or seated onto the new shaft.
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