Cylinder Components
System-Matched D902 Cylinder Head – Fits Kubota RTV900
<p><strong>Overhaul kit contents verified item-by-item against your engine build record before dispatch.</strong></p>
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<p>Get your Kubota V2403-powered equipment back online fast—no more downtime waiting for OEM delays or risking counterfeit parts that fail mid-shift. This <strong>Kubota V2403 cylinder head</strong> arrives fully assembled with valves, springs, and hardened valve seats pre-installed and pressure-tested, so you skip the labor-intensive setup and avoid mismatched components that cause compression leaks.</p> <ul> <li>Fits 30+ engine variants—including CR, DI, TE2B, and T-E3B series—with precise OEM-spec machining on the deck surface (flatness tolerance ≤0.05mm)</li> <li>Direct replacement for 10 verified part numbers like 1G855-03042B and 1G916-03040B—no cross-referencing guesswork</li> <li>Ready to install on KX121/KX161 excavators, L-series tractors (L4200–L5740), R510/R520 loaders, and SQ/KJ generators</li> <li>Backed by XUNPO’s 6-month warranty and technical verification—send us your engine serial if unsure</li> </ul>
MOQ
1 Piece
Lead Time
2-5 Business Days
Shipping
120+ Countries
Warranty
3-12 Months
Compatible Brands
| 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 |
| 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 |
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.
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.
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.
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.
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.
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.
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.
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: +86 187 2205 7128 | Email: talos@xunpojx.com
<p><strong>Overhaul kit contents verified item-by-item against your engine build record before dispatch.</strong></p>
View Details<p><strong>1G855-03042B, 1G916-03040B, 1G780-03043B Cylinder Head for Kubota V2403</strong>, complete with valves and springs pre-installed.</p> <ul> <li>Fits <strong>Kubota V2403, V2403-M-DI, V2403-CR</strong> engine variants in excavators, tractors, and generators</li> <li>Induction-hardened valve seats (45–48 HRC) and deck flatness ≤0.05 mm ensure combustion sealing integrity across rebuild cycles</li> <li>Matched valve train tolerances (stem ±0.005 mm, spring rate 280 N/mm) eliminate piecemeal sourcing mismatch</li> <li>Hydraulic tested at 150 psi for 10 min before dispatch</li> </ul> <p>Overhaul gasket kit contents verified against head assembly for complete top-end rebuild — matched sets ship together.</p>
View Details<p>Get your Kubota KX080-3/4 or Bobcat S650 back online fast with full OEM-equivalent reliability — no more downtime waiting for slow OEM lead times or risking counterfeit rebuild kits. The <strong>V3307 engine overhaul kit</strong> includes a fully heat-treated alloy crankshaft and four precision-balanced connecting rods, ensuring proper journal alignment and eliminating premature bearing wear — a critical detail many suppliers overlook.</p> <ul> <li>Fits V3307, V3307T, V3307-DI, and Tier 4-compliant variants (V3307-CR-TE4-SL2-Q)</li> <li>Complete standard-spec rebuild: liners, pistons, rings, valves, bearings, gaskets & bushings — all pre-matched</li> <li>Ready to ship from Guangzhou warehouse — 1-piece MOQ, 2–5 working day dispatch on in-stock orders</li> <li>Backed by 12-month warranty and technical verification support before you order</li> </ul>
View Details<p>Overhaul kit contents cross-checked against your specific D782 build history before shipment.</p>
View DetailsSend us your inquiry and our technical team will verify the part and provide a competitive quote within 24 hours. MOQ starts from 1 piece.
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