<p>Eliminate costly downtime with this Kubota KX121-3 cylinder head assembly, precision-engineered to restore peak performance to your V2403 engine. Directly replaces OEM part numbers including 1G855-03042B and 1G916-03040B, ensuring seamless fit and reliable operation for excavators and tractors.</p> <ul> <li>Complete assembly includes valves and springs for immediate installation, reducing repair time and labor costs</li> <li>Manufactured to ISO standards with rigorous pre-shipment testing, delivering OEM-equivalent quality without the premium price tag</li> <li>Compatible with Kubota V2403-M and CR series engines found in KX121-3, KX161-3 excavators and L4200-L5740 tractors</li> </ul>
| Parameter | Details |
|---|---|
| Part Name | Engine V2403 Complete Cylinder Head with Valves |
| Replacement Part Numbers | 1G855-03042B, 1G916-03040B, 1G780-03043B, 1G896-03040B, 1G928-03040B, 1G851-03040B, 1G851-03042B, 1G851-03043B, 1J854-03040B, 1J860-03040B |
| Brand Compatibility | Kubota |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| Brand | Applicable Models |
|---|---|
| Kubota Generator | KJ-S150V-USA, KJ-S150VX-USA, KJ-T210V-USA, KJ-T210VX-USA, SQ-1200-USA, SQ-3250-USA-SW |
| Kubota Excavator | KX121-2, KX121-2(S SERIES), KX121-3, KX121-3S, KX121-3ST, KX161-2, KX161-2(S SERIES), KX161-3, KX161-3S, KX161-3ST, U45S, U45ST |
| Kubota Tractor | L4200DT, L4200DT-C, L4200DT-GST, L4200DT-GST-C, L4200F, L4200F-C, L4200F-GST, L4240DT, L4240DT-3, L4240GST, L4240GST-3, L4240HST, L4240HST-3, L4240HSTC, L4240HSTC-3, L4300DT, L4300F, L4310DT, L4310DT-GST-C, L4310F, L4310GST, L4310HST, L4310HST-C, L4330DT, L4330GST, L4330HST(C), L4400DT, L4400F, L4400H, L45, L4600DT, L4600F, L4600H, L4610DT-GST, L4610DT-HST, L4610DT-HST-C, L4630DT, L4630GST(C), L4630HST, L4740GST, L4740GST-3, L4740HST, L4740HST-3, L4740HSTC, L4740HSTC-3, L48, L5030GST, L5030HST(C), L5040GST, L5040GST-3, L5240HST, L5240HST-3, L5240HSTC, L5240HSTC-3, L5740HST, L5740HST-3, L5740HSTC, L5740HSTC-3, M4800SUD-F, M4800SU-F, M5140DT, M5140DTC, M5140F, M5140FC, M5140HD, M5140HDC, M5640SU, M5640SUD, M5640SUD-1, M59, MX4700DT, MX4700F, MX4700H, MX5000DT, MX5000F, MX5000SU, MX5100DT, MX5100F, MX5100H |
| Kubota Wheel Loader | R510 NEW TYPE, R510B NEW TYPE, R520, R520S |
Equipment downtime costs thousands daily when your Kubota excavator or tractor is out of service. Many operators face the frustration of waiting 2-4 weeks for overpriced OEM cylinder heads, or worse, installing counterfeit parts that fail prematurely and cause secondary engine damage. With 10 years of experience serving repair shops and fleet managers worldwide, we understand how critical reliable replacement parts are to keeping your machinery operational.
Our Kubota V2403 cylinder head with valves solves these challenges by delivering ISO-certified quality at a fraction of OEM prices. As a professional supplier with 20+ industry experts and 10,000+ SKUs in stock, we ensure each cylinder head undergoes rigorous incoming material inspection and pre-shipment performance testing. Whether you're repairing a KX121-3 excavator on a construction site or a L5030 tractor on a farm, our complete cylinder head assembly arrives ready to install, minimizing your equipment's idle time.
The cylinder head is the heart of your Kubota V2403 engine, responsible for sealing combustion chambers, housing valves, and maintaining proper compression. In high-stress applications like mining, construction, or agricultural operations, this component endures extreme temperatures and pressure. A properly manufactured cylinder head ensures efficient fuel combustion, optimal power output, and reduced emissions—critical factors for both performance and regulatory compliance.
Our cylinder head assembly incorporates several key engineering features that directly impact durability: The valve seats are precision-machined to OEM specifications, ensuring proper valve seating and preventing compression leaks. High-quality valve springs maintain consistent valve timing even under heavy load, while the cast iron construction provides superior heat resistance compared to cheaper aluminum alternatives. Each unit includes pre-installed valves and springs, eliminating the need for time-consuming component sourcing and assembly—saving your shop valuable labor hours.
While aftermarket parts may seem like a cost-cutting measure, inferior cylinder heads often lead to higher total costs. A poorly cast head can develop cracks under thermal stress, requiring complete engine teardown and replacement. Counterfeit valves may fail prematurely, causing piston damage and costly repairs. Our ISO-certified Kubota cylinder head meets OEM-equivalent standards, providing the same reliability as original parts without the 30-50% price markup. With a 3–12 month warranty against manufacturing defects, you're protected against unexpected failures.
We partner exclusively with ISO-certified factories and implement strict quality control protocols, including incoming material inspection and pre-shipment performance testing. Our 10 years of global export experience means we've served customers in 120+ countries, adapting to diverse market requirements. With a 20+ person technical team available 24/7, we can verify part compatibility within 2 hours, ensuring you get the correct component the first time. Our Guangzhou warehouse stocks 10,000+ commonly used parts, allowing us to ship in-stock items within 2
Send us your requirements -- part number, machine model, quantity, and destination. Our team responds within 24 hours with a competitive quote.
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