ranroswang@hksparkling.com 
+86 138 2341 8469
31Q8-17640 XJAA-00089 XKAY-01391 Spool Kit - Arm 1 for Hyundai HX300L R290LC-9 R450LC-7 Excavator
This high-precision Arm 1 Spool Kit (Part Nos: 31Q8-17640 / XJAA-00089 / XKAY-01391) is specifically engineered for Hyundai Crawler Excavators, including the HX300L, R290LC-9, and R450LC-7. It ensures smooth hydraulic flow and precise arm movement control, restoring your machine’s efficiency to OEM standards.
Dear Valued Partners,
Thank you for choosing SPARKLING MACHINERY, your professional supplier for construction machinery brake and transmission parts.
We proudly offer the 31Q8-17640 Arm 1 Spool Kit, designed for Hyundai HX300L, R290LC-9, and R450LC-7 excavators. This kit is critical for precise control of the arm cylinder, directly affecting operating smoothness, speed, and efficiency.
The SPARKLING MACHINERY NEW 31Q8-17640 Arm 1 Spool Kit Photo:
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Precision Engineering: Manufactured to exact tolerances for seamless fit in the main control valve.
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Enhanced Durability: Heat-treated steel prevents premature wear under high-pressure conditions.
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Optimized Performance: Restores Arm 1 response speed and reduces hydraulic leakage.
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Plug & Play: Direct replacement for original Hyundai part numbers without modification.
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- Machine Compatibility & Part Number Reference：
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| Machine Model | Part Number Reference | Component |
| Hyundai HX300L | 31Q8-17640 | Arm 1 Spool Kit |
| Hyundai R290LC-9 | XJAA-00089 | Arm 1 Spool Kit |
| Hyundai R450LC-7 | XKAY-01391 | Arm 1 Spool Kit |
| Hyundai R300LC-9S | 31Q8-17640 | Arm 1 Spool Kit |
Q&A
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Q1: Is this spool kit compatible with other models?
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A: It is specifically designed for Hyundai HX300L, R290LC-9, and R450LC-7. Please verify your part number before ordering.
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Q2: How do I ensure this solves my "Arm Slow" issue?
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A: This kit replaces worn Arm 1 spools which often cause lag. We recommend checking your relief valve pressure alongside installation.
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Q3: Do you offer a warranty on this hydraulic part?
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A: Yes, we provide a standard quality guarantee against manufacturing defects to ensure reliable operation.
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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
sparkling_machinery
Whatsapp: +8613609010879