Product Specifications
| Parameter | Details |
|---|
| Part Name | Complete Cylinder Head with Valves & Springs |
| Part Number (OEM Reference) | 1G855-03042B, 1G916-03040B, 1G780-03043B, 1G896-03040B, 1G928-03040B, 1G851-03040B, 1G851-03042B, 1G851-03043B, 1J854-03040B, 1J860-03040B |
| Brand Compatibility | Kubota |
| Engine Model Fitment | V2403, V2403-CR-E4B-ACP-1, V2403-CR-E4B-KSR-1, V2403-CR-E4B-KSR-2, V2403-CR-TE4B-ACP-1, V2403-CR-TIE4B-SKL-1, V2403-CR-TIE4BG-MLR1, V2403-M-DI-E2B-IR-1, V2403-M-DI-E3B-ACP-1, V2403-M-DI-E3B-ACP-2, V2403-M-DI-E3B-DIP-1, V2403-M-DI-E3B-DIP1F, and 30+ additional V2403 variants |
| Condition | New Aftermarket |
| Warranty | 12-month warranty against manufacturing defects |
| Packaging | Original protective packaging with anti-rust coating, sealed carton box with foam cushioning |
Compatible Models
| 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 |
Tired of Engine Shutdowns? Get the Right Kubota V2403 Cylinder Head Assembly for Your Critical Equipment
Every unplanned engine stoppage on a Kubota excavator or generator costs operators hundreds to thousands of dollars per hour in downtime. Counterfeit or low-grade cylinder heads cause valve seat recession, coolant leakage, and head gasket failure—often within 200 operating hours. OEM replacements require 3–4 weeks lead time and carry a 42% price premium over verified aftermarket alternatives. Fleet managers across Southeast Asia and Africa report repeated mismatches when sourcing parts across multiple suppliers.
OEM-Equivalent Quality, Ready to Ship
This Kubota V2403 complete cylinder head is manufactured in ISO 9001-certified facilities and undergoes full functional testing—including hydraulic pressure hold at 12 bar and valve spring load verification—before dispatch. With 10 years’ experience supplying Kubota engine components globally, XUNPO maintains over 10,000 SKUs in our Guangzhou warehouse, including this assembly. It’s engineered for direct bolt-on installation during scheduled maintenance or emergency engine rebuilds on KX121 excavators, L5030 tractors, and KJ-S150V generators.
Where This Part Works
This cylinder head operates under high thermal cycling and mechanical stress in construction, agriculture, and power generation applications. In quarry excavators like the KX161-3ST, it endures continuous combustion cycles at peak loads above 2,800 rpm. On port-side generators such as the SQ-3250-USA-SW, it maintains sealing integrity across ambient temperatures from −10°C to +55°C. Choosing a dimensionally accurate, heat-treated replacement is critical—not just for compression retention but for preventing catastrophic coolant-oil mixing that disables hydraulic systems downstream.
Engineering Details That Matter
The cylinder head casting uses high-silicon aluminum alloy (A380 equivalent) with T6 heat treatment, achieving 120 HB hardness and resisting thermal distortion up to 220°C. Valve seats are induction-hardened to 55 HRC, matching OEM wear resistance specifications. All intake and exhaust valves are precision-ground stainless steel (Inconel 751 for exhaust), seated to ±0.02 mm concentricity tolerance. The integrated water jacket design follows Kubota’s original flow path geometry—verified via CFD simulation—to ensure uniform cooling and prevent hot-spot cracking. Surface finish on deck mating surfaces is maintained at Ra 0.8 μm for optimal gasket seal performance.
The Real Cost of Wrong Parts
A $180 counterfeit cylinder head may save $90 upfront—but leads to $2,400 in labor for rework, $650 in coolant/oil contamination cleanup, and 3.2 days of equipment idleness. Industry data shows non-OEM-equivalent heads fail 1.7× faster under ISO 8528-1 duty cycle testing. Total cost of ownership (TCO) over 1,500 operating hours is 3.4× higher for substandard parts versus this XUNPO assembly, which meets all dimensional, material, and performance criteria of Kubota’s service manual TM1275. This Kubota V2403 cylinder head with valves and springs delivers predictable life, verified compatibility, and zero integration risk.
Why Customers Trust XUNPO
Only ISO 9001-certified factories supply our engine components—every batch undergoes incoming material inspection for alloy composition and tensile strength. Each cylinder head is subjected to 100% post-assembly performance testing: 12-bar water pressure hold for 15 minutes, valve lift/seat contact verification, and surface flatness measurement within ±0.05 mm. We offer a full 12-month warranty covering manufacturing defects—no restocking fees, no return shipping charges. Our team has shipped to 122 countries since 2015, supporting repair centers in Nigeria, Poland, Chile, and Thailand. With 22 engineers on staff—including 8 with Kubota factory training—we confirm part fitment in under 2 hours. Over 9,200 units of this exact assembly are held in stock at our Guangzhou warehouse for same-day dispatch.
Packaging & Shipping
- Individually sealed in anti-corrosion VCI film, mounted on custom-cut EPE foam, packed in double-walled corrugated carton
- In-stock items ship within 2–5 working days after payment confirmation
- Express (DHL/FedEx/UPS), air freight, and sea freight options available—customs documentation included
- Real-time tracking number provided upon dispatch; delivery updates sent automatically
- Minimum order quantity: 1 piece—designed for urgent field repairs and single-unit testing
Get Your Parts Now
Your excavator or generator isn’t generating revenue while waiting for parts. Send your machine model (e.g., “KX121-3”), required quantity, and destination country—we’ll reply within 24 hours with a firm quote and availability status. First-time buyers can request a sample for physical validation before bulk ordering. Every day delayed is a day of lost productivity and mounting operational cost.
Frequently Asked Questions
Q: Is this a genuine Kubota part or an aftermarket replacement?
A: This is an OEM-equivalent aftermarket cylinder head, produced in ISO 9001-certified facilities to match Kubota’s dimensional, material, and performance specifications—not a recycled or refurbished unit.
Q: How do I confirm if this fits my specific Kubota engine variant?
A: Provide your full engine serial number or machine model (e.g., “L5040GST-3”) and we’ll verify compatibility using Kubota’s official parts database—response guaranteed within 2 hours.
Q: What is the warranty coverage?
A: 12-month warranty against manufacturing defects, including valve seat cracking, casting porosity, or incorrect valve spring load—full replacement or refund with no conditions.
Q: What is the minimum order quantity?
A: 1 piece—no bulk requirement. Ideal for emergency repairs, technical validation, or small fleet maintenance.
Q: How fast can I receive this part?
A: In-stock items ship from Guangzhou within 2–5 working days. Express shipping delivers to most destinations in 3–7 business days.
Q: Can I receive a sample before placing a bulk order?
A: Yes—first-time customers may request one sample unit for physical testing and fitment verification prior to full order placement.
Ready to order or need a quote?
Send your part number, machine model, and quantity — we'll respond within 24 hours.
WhatsApp: +86 13316055942 | Email: talos@xunpojx.com
