Every main pump on a Kobelco excavator carries at least two identities. One is the maker's model, stamped or cast on the housing — K3V112, K5V140 and their relatives. The other is the assembly number under which the machine builder sells it, which may be a Kobelco YN number, a maker number, or both stacked on the same label. Buyers lose money when they quote one identity and expect the other, and this guide is about telling them apart. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes pump and regulator work weekly and keeps both numbering systems in the same stock list.
Two numbers, one pump
The maker's model describes the hydraulic design: displacement, control type and the family the internal parts belong to. The assembly number describes the build that went into a particular machine, including the regulator setting, the fittings and the mounting. Two pumps can share a maker model and carry different assembly numbers because they were set up for different machines, and two different maker models can sit inside assemblies that look identical from outside. That is why a photograph of the pump plate beats a model name every time.
The pump assemblies in our stock list
| Component | Number held in our stock list | Fitment as listed |
|---|---|---|
| Hydraulic pump assembly | 2924610-0030 / YN10V00005S156 | K3V112 / K5V140 class — confirm by plate |
| Hydraulic pump assembly | 30C12A-111 / YN35V00004F2 | Various models — confirm by plate |
| Hydraulic pump assembly, multi-marked | 30C40-111 / YN35V00018F2 / YB35V00003F1 | Various models |
| Hydraulic pump assembly | 30C50-143 / YN35V00054F1K | Various models |
| Gear pump | 2902440-1852D / 2902440-1673G / YN10V00014F2KPM | Listed for the SK200-8 group |
| Valve group, 30C50 series | YN35V00048F1 / 30C50-122 / 30C50-139 | Various models — multi-marked row |
Rows marked "various models" are not vague by accident. The same pump assembly was fitted across more than one machine designation, and the fitment is confirmed from the plate rather than from the listing. A supplier who quotes confidently without asking for that plate is quoting a guess.
Regulators: three generations in one stock list
The regulator is where most pump work actually starts, because it is the part that decides pressure and flow on demand. Our stock list carries three clear generations of the same idea: YN10V01006F1 listed for the SK200-6, 29070821-4927 / YN10V01006F2 listed for the K3V112 group, and YN10V01009F4 / GYT6K listed for the SK200-8. They sit on machines of the same nominal tonnage and they are not interchangeable. When a machine loses power, lugs down under load, or holds a function slow at low idle, the regulator is the first suspect and the last part that should be bought by assumption.
Why K3V112 and K5V140 are not a size question
K3V112 belongs to the 20-tonne class and K5V140 to the 33-35 tonne class, so a machine's tonnage tells you which family you are looking for — but not which assembly number inside it. Replacement pumps, regulators and rotating groups are quoted with the pump plate on the table, because a K5V140 fitted to a larger machine carries different settings from one built for a different duty. This is one of the few places where the maker model and the assembly number must be read together. Our article on K3V112 versus K5V140 on the SK200-8 covers the 20-tonne case in detail.
Internal parts carry their own numbers
Above the assembly level, repair parts have identities of their own. The set plate — the valve plate that seals the rotating group — is listed as 2924110-0056 / LC10V00010S153 / 2437U213S153 across the K3V112 and K5V140 families. Gear pumps for pilot and auxiliary circuits, such as 2902440-1852D / 2902440-1673G / YN10V00014F2KPM, are separate items with separate numbers. Buying at this level is what makes a rebuild economical, provided the numbers are confirmed against the plate rather than against the pump's external appearance.
How we supply
Guangzhou Shenyue Machinery Technology Co., Ltd. has specialised in Kobelco parts since 2007, with 4 warehouses over 1000 m² in Guangzhou, 3,000+ part types on the shelf and 100,000+ part numbers available to order through original supply channels. Shenyue is an independent supplier and is not an authorized dealer of Kobelco Construction Machinery Co., Ltd.; for Kobelco, Hino, Isuzu, Yanmar, Cummins, Kawasaki, Nabtesco, KYB and KPM we supply genuine parts ordered through original supply channels alongside quality replacement alternatives, at prices close to agent level, and the five brands we hold formal authorization for — Mitsubishi, Garrett, TONGMYUNG, Marusan and NIKURA — are named on every quotation. Browse hydraulic components, then confirm any number on the part number search page; technical background published by Kawasaki — the maker behind the K3V and K5V families — is available at khi.co.jp.
Frequently Asked Questions
How do I know which hydraulic pump my Kobelco uses?
From the pump's own plate, not from the machine model alone. The maker's model — K3V112 or K5V140 for example — identifies the family, while the assembly number identifies the build. Our list holds assemblies such as 2924610-0030 / YN10V00005S156; send both plates to Guangzhou Shenyue Machinery Technology Co., Ltd. and the correct one is confirmed before quoting.
What is the difference between K3V112 and K5V140?
Class, mainly. K3V112 belongs to the 20-tonne machines and K5V140 to the 33-35 tonne class, so they are not a size of the same pump but two families for two classes. Settings and controls also differ between the two, which is why assemblies are never swapped on tonnage alone.
Can the regulator be replaced without changing the whole pump?
Usually yes, provided the rotating group and the bores are still within specification. A regulator swap is a normal repair and far cheaper than an assembly. The regulator number must match the pump it sits on — our list carries YN10V01006F1, 29070821-4927 / YN10V01006F2 and YN10V01009F4 / GYT6K for different builds.
Why do some pump numbers carry two or three part numbers?
Because one physical part can be sold under a maker number and a machine-builder number at the same time, and supersessions add further markings. Any of the numbers in the row will identify the same item; what matters is that the row fits the machine and that the grade is declared.