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Fab Heavy Parts  |  SKU: rob226090019

New Radiator Core Assy RC411-42300 Fits Kubota KX121 U45 KX161

£368.00
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  • Powering 10,000+ Commercial Fleets

  • One Year Warranty

  • Easy 60-day Return

  • Expert support & Fitment Guarantee

Description

New Radiator Core Assy RC411-42300 Fits Kubota KX121 U45 KX161

Maintain your machinery's efficiency with reliable radiator components designed for optimal cooling performance. This OEM-spec radiator core ensures durability and precise fit for construction and agricultural equipment.

Compatible Part Numbers

  • RC411-42300

Compatible Equipment

  • Kubota Excavators: KX121, U45, KX161

1 Year Warranty

Fab Heavy Parts is excited to offer a 12-month warranty on all new replacement/aftermarket parts starting from your original purchase date.

Enjoy peace of mind with Fab Heavy Parts!

For more warranty details, please check out our warranty policy.

Fast Delivery

Estimated delivery time 3-6 workdays

No Core Charge

We don't have a core charge for any products.

Questions & Answers loading...

Technical Specifications

Pressure Rating
Up to 3,000 PSI
Flow Rate
Up to 60 GPM
Core Material
Aluminum Alloy
Warranty
1 Year
Fitment
OEM Direct Fit
New Radiator Core Assy RC411 - 42300 Fits Kubota KX121 U45 KX161 - Fab Heavy Parts
Durability

Built for Heavy-Duty Conditions

Engineered with industrial-grade aluminum alloy cores and precision-brazed fins, our hydraulic radiators deliver maximum heat dissipation under sustained heavy-load operation — keeping your equipment running at optimal temperature in the most demanding environments.

  • Industrial-grade aluminum alloy core
  • Precision-brazed fin construction
  • Pressure-tested before shipping
  • Rated for extreme temperature cycles
OEM fitment
Fitment

Direct OEM Cross-Reference Fitment

Every Fab Heavy Parts radiator is cross-referenced against OEM part numbers to ensure drop-in compatibility. No modifications, no adapters — a direct replacement that installs in the same time as the original, verified against factory service manuals.

  • OEM part number cross-referenced
  • Direct bolt-on — no modifications
  • Verified against factory service manuals
  • Fits Komatsu, CAT, Hitachi, Volvo & more
Cooling efficiency
Performance

Superior Cooling Efficiency

High-density fin spacing and optimized core geometry maximize heat transfer surface area, delivering cooling performance that meets or exceeds OEM thermal specifications — even under continuous peak-load operation on excavators, loaders, and heavy construction equipment.

  • Meets or exceeds OEM thermal specs
  • Optimized fin density for max airflow
  • Validated under peak-load conditions
  • Reduces hydraulic fluid operating temp

How We Compare

OEM-grade quality at a competitive price — with the support and warranty to back it up

Feature Fab Heavy Parts OEM Dealer Generic Brand
OEM Cross-Reference Verified
Industrial-Grade Alloy Core Varies
1-Year Warranty Limited
Expert Technical Support Dealer Only
Competitive vs OEM Pricing ✗ Premium
Pressure-Tested Before Ship Varies

Why Fleet Operators Choose Fab Heavy Parts

⚙️

OEM-Grade Quality

Manufactured to OEM specifications with industrial-grade materials and precision tolerances.

🛡️

1-Year Warranty

Every radiator backed by our comprehensive 1-year parts warranty with no-hassle claims.

🔧

Expert Technical Support

Our parts specialists verify fitment and answer installation questions before and after purchase.

Frequently Asked Questions

Match the OEM part number in the product title against your machine's service manual or parts catalog. You can also contact our technical support team with your machine's serial number and we'll confirm fitment before you order — no charge.
No modifications required. All Fab Heavy Parts hydraulic radiators are engineered as direct OEM replacements. Mounting points, port locations, hose connections, and overall dimensions match the original specifications exactly. Standard hand tools are sufficient.
Our warranty covers manufacturing defects and material failures under normal operating conditions. To make a claim, contact our support team with your order number and a description of the issue. We'll arrange a replacement or refund within 3 business days of claim approval. Damage from improper installation or contaminated fluid is not covered.
Our radiators are compatible with standard petroleum-based hydraulic oils (ISO VG 32, 46, 68), biodegradable hydraulic fluids, and most synthetic hydraulic fluids. Always follow your equipment manufacturer's fluid specification for optimal performance and warranty compliance.
In-stock items ship in 1-2 business day from our US warehouse. For radiators weigh over 68KGS we'll ship in 2-3 business days. Expedited shipping options are available at checkout. You'll receive tracking information by email as soon as your order ships.
Yes — we accept returns within 30 days of delivery for unused, uninstalled parts in original packaging. If the part doesn't fit due to a listing error on our end, we cover return shipping. Contact our support team and we'll make it right.
Yes. We offer tiered wholesale pricing for fleet operators, repair shops, and OEM service centers. Contact our B2B team or use the wholesale inquiry form on our site to receive a custom quote based on your volume and part requirements.

Frequently Asked Questions

Do you ship to the UK?

Yes, we ship to mainland UK, Scotland, Wales, and Northern Ireland. Shipping rates are displayed at cart page.

Will I be charged import duties or VAT?

Our prices do not include VAT or import duties. UK and European customers are responsible for any applicable import taxes, VAT, and customs fees charged upon entry into their country.

Customs Duty: Goods valued under £135 are generally exempt from customs duty (except for excise goods like alcohol and tobacco, or certain gifts). Goods over £135 are subject to standard customs duties based on the item's commodity code.

These charges vary depending on the commodity code, order value, and destination country. We recommend checking with your local customs authority or HMRC (for UK customers) before placing your order.

How long will delivery take to the UK?

Standard delivery to UK addresses is typically 4–7 business days from dispatch. Express options may be available at checkout. Customs clearance can add 1–3 additional business days in some cases.

Are your parts compatible with UK and European specifications?

Many of our engine, hydraulic, and powertrain components are compatible with EU and UK-market machines. Please verify the part number against your OEM manual or machine serial plate before ordering. Contact us with your machine make, model, and serial number if you need fitment confirmation.

What currency will I be charged in?

UK customers are billed in GBP (£).

What is your returns policy for UK orders?

We accept returns within 60 days of delivery for unused parts in original packaging. UK customers are protected under the Consumer Contracts Regulations 2013, which grants a 14-day right to cancel an order before it has been dispatched. Once an order has been fulfilled and shipped, standard return terms apply. Return shipping costs for non-defective items are the buyer's responsibility.

How do I verify a part number before ordering?

Each listing includes part numbers and compatible machine models. Cross-reference with your OEM workshop manual, or contact our technical team via the contact form with your machine make, model, year, and serial number.

Do you offer trade accounts for UK buyers?

Yes. UK trade customers can apply for a B2B account to access volume pricing and dedicated account support.

What payment methods do you accept?

We accept all major credit and debit cards including Visa, Mastercard, and American Express. We also support PayPal, Apple Pay, and Google Pay at checkout. For B2B and trade customers, bank transfer (BACS) and net payment terms may be available upon account approval — please contact us to discuss your requirements.

How do I find out the shipping cost for my order?

You can get an estimated shipping cost directly on the cart page — just add your parts to the cart and enter your delivery postcode to see available shipping options and rates. For large or heavy orders requiring a freight quote, please contact us directly with your parts list and delivery postcode.

Why Choose Fab Heavy Parts

  • 12-Month Warranty

    All parts backed by our comprehensive warranty for peace of mind

  • Guaranteed Fitment

    Verified compatibility with your equipment specifications

  • Fast Delivery

    Quick shipping to get your parts when you need them

  • In-House Experts

    Knowledgeable team ready to help with your questions

Ask a Question

Feel free to leave your question with us. Our current response time is around 24 hours, though we will get back to you faster when possible.

New Radiator Core Assy RC411 - 42300 Fits Kubota KX121 U45 KX161 - Fab Heavy Parts
Fab Heavy Parts

New Radiator Core Assy RC411-42300 Fits Kubota KX121 U45 KX161

£368.00

New Radiator Core Assy RC411-42300 Fits Kubota KX121 U45 KX161

Maintain your machinery's efficiency with reliable radiator components designed for optimal cooling performance. This OEM-spec radiator core ensures durability and precise fit for construction and agricultural equipment.

Compatible Part Numbers

Compatible Equipment

View product