Searching for a reliable Mitsubishi S4F crankshaft replacement? OEM 34420-02002 forged steel assembly eliminates torsional fatigue in your FD15 forklifts
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Searching for a reliable Mitsubishi S4F crankshaft replacement? This heavy-duty forged steel assembly (OEM: 34420-02002) is engineered to cure torsional fatigue and thrust wear in demanding material handling applications. It provides direct fitment for Mitsubishi FD15/FD20 forklifts and compact excavators. Available now for global supply fleet managers and engine rebuilders worldwide.
The Mitsubishi S4F diesel engine is a highly capable, compact powerplant that serves as the heart of countless 1.5-ton to 2.0-ton forklifts and mini excavators worldwide. In these specialized industrial applications, the engine is subjected to a unique set of abuses: relentless stop-start operations, rapid forward-to-reverse directional changes, and heavy hydraulic loading. Over thousands of hours, these constant shock loads transfer directly to the rotating assembly, frequently causing the original cast crankshafts to succumb to torsional fatigue, micro-cracking, and accelerated thrust bearing wear.
To eliminate this critical failure point, Ruich Value has re-engineered the 34420-02002 replacement crankshaft utilizing high-density 42CrMo forged steel. This advanced metallurgy exponentially increases the crankshaft’s tensile strength and flexural resistance compared to standard OEM castings. Furthermore, our state-of-the-art induction hardening process brings all main and rod journals to a robust HRC 50-55 hardness. Whether you are overhauling a commercial Clark forklift fleet or repairing a Pel-Job compact excavator, this precision-balanced crankshaft ensures your equipment returns to the job site with zero compromises in reliability.
| OEM Part Number | 34420-02002 |
|---|---|
| Cross Reference | 34420-02000, 34420-02001 |
| Engine Compatibility | Mitsubishi S4F Diesel (Indirect Injection) |
| Material Metallurgy | High-Tensile Forged Steel Alloy (42CrMo) |
| Surface Hardness | Induction Hardened Journals (HRC 50-55) |
| Stroke Length | 90.00 mm |
| Main Journal Diameter | 78.00 mm (Standard OEM Spec) |
| Rod Journal Diameter | 52.00 mm (Standard OEM Spec) |
| Balancing Standard | Dynamic Spin-Balanced (≤ 5g·cm) |
| OEM Brand | Application Category | Known Compatible Models |
|---|---|---|
| Mitsubishi | Diesel Forklift Trucks | FD15, FD18, FD20 (1.5T to 2.0T Capacity) |
| Clark | Material Handling | Select D-Series Forklifts (Verify S4F Engine Code) |
| Pel-Job / Volvo | Compact Excavators | EB25, EB30 series compact excavators |
From compact S-Series engines to heavy-duty 6D models, Ruich Value supplies the premium aftermarket components needed to keep global industrial fleets operational. Explore our inventory below.
| Engine Model | Main Application |
|---|---|
| S4Q | Mitsubishi Forklift, Mini Excavator, Caterpillar |
| 4D30 / 4D31 (6 Holes) | Fuso Canter, Rosa Bus |
| 4D32 (9 holes) | Fuso Canter |
| 4D33 / 4D34 | Fuso Canter FE Series, Rosa Bus |
| 4D35 | Fuso Canter |
| 4D55 | Older L200, Pajero |
| 4D56 / D4BA | L200, Pajero, Hyundai H1/H100, Delica |
| 4D56T / 4D56U | L200 Triton, Pajero Sport (Common Rail) |
| 4DR5 | Mitsubishi Jeep, Canter |
| 4G15 / 4G13 | Mitsubishi Lancer, Colt, Mirage |
| 4G54 | Pajero, Forklift, Mazda B2600 |
| 4G63 | Mitsubishi Forklift (FG25), Galant, L300 |
| 4G64 | Mitsubishi Forklift (FG25), Galant, L300 |
| 4M40 | Pajero, Delica, Triton |
| S4S | Mitsubishi Forklift, Clark, TCM Forklift |
| S6KT | CAT 320 Excavator (Rebadged 6D16) |
| S4E / S4E2 | Forklift, Marine Engine |
| S4F | Agriculture, Tractor |
| S4K | CAT Excavator (E120B), Mitsubishi |
| S6K | CAT Excavator (E200B), Mitsubishi |
| S6S | Forklift (FD35), Excavator |
| 6D14 / 6D15 | Fuso Fighter, Kato/Kobelco Excavator |
| 6D16 / 6D16T | Fuso Fighter, Kobelco SK330 |
| 6D17 | Fuso Fighter (Late model) |
| 6D31 / 6D31T | Fuso FK, Excavators |
| 6D34 / 6D34T | Fuso Fighter, Construction |
| 6D22 / 6D20 / 6D24 | Fuso Super Great, Heavy Excavator |
| 6D40 | Fuso Super Great (Heavy Truck) |
| 8DC91 / 8DC92 | Fuso Super Great, Heavy Dump Truck |
| 8DC11 / 8DC82 | Fuso Heavy Duty Truck |
| 6G72 | Pajero V6, Montero |
| 6DB1 / 6DB10 | Older Fuso Truck |
| 6M70 | Fuso Super Great (Common Rail) |
| 8PC1 / 8PE1 | Fuso Bus, Heavy Truck |
Discover more commercial solutions in our Mitsubishi Parts Hub.
Thrust bearing wear (often called “crank walk”) is exacerbated in forklifts because of the constant forward/reverse shifting and torque converter pressures. This lateral force pushes against the crankshaft thrust faces. Our 34420-02002 replacement features precision-ground and hardened thrust surfaces to resist this wear, but verifying proper end-play (0.05–0.175 mm) during installation is absolutely critical.
The primary OEM reference for the S4F engine in Mitsubishi FD15, FD18, and FD20 forklifts is 34420-02002. This forged profile is also completely backward compatible with earlier casting numbers such as 34420-02000 and 34420-02001.
Yes. In compact excavation and dusty warehouse environments, ultra-fine silica dust can bypass aging air filters or enter through compromised PCV systems, mixing with the engine oil. This creates a highly abrasive grinding paste. Our HRC 50-55 induction-hardened journals resist this scoring, but maintaining strict air filter and oil change intervals is mandatory.
No. Our brand-new S4F crankshafts are manufactured to exact OEM standard (STD) dimensions (78.00 mm mains, 52.00 mm rods). You will need a complete set of STD main bearings, rod bearings, and thrust washers for a proper factory-spec installation.
To ensure zero transit damage to the precision-ground journals, every order is coated in heavy-duty anti-rust preventative, wrapped in VCI corrosion-inhibiting plastic, and securely bolted inside reinforced export-grade wooden crating.
Partner with Ruich Value to supply your heavy equipment repair facility or parts distribution network with premium aftermarket engine components. Contact us today for direct wholesale pricing.
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