The main hydraulic pump is the most expensive component on a Kobelco excavator after the engine, and it is also the part most often ordered against the wrong model family. Two pump families dominate the Kobelco range: K3V112 on the 20-ton SK200-8 class, and K5V140 on the 33–35 ton SK350-8 / SK330-8 class. They are not interchangeable, and the mistake is common enough that the technical team at Guangzhou Shenyue Machinery Technology Co., Ltd. asks for a nameplate photograph on every pump enquiry.
Which pump does a Kobelco SK200-8 use?
SK200-8 class machines normally run the K3V112DT main hydraulic pump. Pump assemblies we hold for this family are quoted under 2924610-0030 / YN10V00005S156, with K3V112 internal parts such as the set plate 2924110-0056 / LC10V00010S153 and the regulator assembly 29070821-4927 / YN10V01006F2 available against the same family.
The K5V140 pump belongs to the heavier SK350-8 / SK330-8 class machines. If a quotation for K5V140 arrives for an SK200-8, the supplier has been given the wrong machine class or has mixed up the two families — either way, stop before paying.
| Machine class | Pump family | Typical application |
|---|---|---|
| SK200-8 / SK210-8 (20–21 ton) | K3V112DT | Main pump, regulator and rotary group repairs |
| SK330-8 / SK350-8 / SK350LC-8 (33–35 ton) | K5V140 | Main pump for the heavier class machines |
Why the mix-up keeps happening
- The outside of a pump tells you less than you think. Cylinder block, plate and piston parts look similar in photographs across families, so a "looks the same" comparison is not evidence.
- Regulators and control parts are ordered from the wrong exploded view. Repair parts for K3V112 and K5V140 sit in different number families, and a correct main-pump number paired with a wrong regulator number still means a machine that will not work.
- Machines are described by tonnage, not by generation. "A twenty-ton Kobelco" can be an SK200-6, SK200-8 or SK200-10, and each build differs in ways that matter to the hydraulic system.
Symptoms: pump, regulator or the machine around it?
- Everything slow, both travel and boom. Suspect main pump delivery or the regulator that controls it — not just the pump.
- Slow only on one function. Usually the control valve or a circuit issue; the pump feeds the whole machine.
- Whine that grows with oil temperature. Aeration, clogged suction strainer, or internal wear.
- Hydraulic oil overheating. Frequently a pump efficiency problem, but confirm the cooler and relief settings first.
- Metal in the oil or filter. Internal damage; the system will need flushing as well as parts, or the replacement inherits the debris.
Diagnostic order that saves money
- Standby pressure, then main relief pressure, at operating temperature.
- Flow test at the pump — this separates a tired pump from a tired circuit.
- Regulator function: does delivery change correctly with load and with the solenoid signal?
- Suction line, strainer and oil condition — the cheapest checks, and the ones most often skipped.
- Contamination check before fitting anything new. A pump replaced into a dirty system fails again quickly, and the second failure is blamed on the part.
Repair or replace
A complete assembly is the right answer when the housing, shaft or cylinder block are damaged. A rebuild with new pistons, set plate, bearings and seals is the right answer when the core is sound — for a K3V112 family pump the regulator, plate and piston parts are all available against the same number family, and the rebuild restores performance for a fraction of the assembly price. State the option you want; we quote both.
What to send with your enquiry
Pump nameplate photograph, machine model and serial, and the symptom. Guangzhou Shenyue Machinery Technology Co., Ltd. supplies Kobelco parts from 4 warehouses over 1000 m² in Guangzhou, with 2,000+ part types on the shelf and 30,000+ part numbers available to order, and every quotation states whether the item is genuine, OEM or aftermarket.
Useful next steps: our part number search for numbers we hold, the hydraulic components page for the pump, swing and travel assemblies, and the SK200 / SK350LC machine pages for the two classes side by side.
Shenyue is an independent supplier of excavator parts and is not an authorized dealer or distributor of Kobelco Construction Machinery Co., Ltd. For Kobelco, Hino, Kawasaki and other brands named here we supply genuine parts ordered through original supply channels plus quality replacement alternatives, at prices close to agent level. For pump application data, the machine manufacturer's own documentation — for example Kobelco's official site — remains the reference.
Frequently Asked Questions
Which hydraulic pump does a Kobelco SK200-8 use?
SK200-8 class machines normally run the K3V112DT main hydraulic pump. We quote pump assemblies for this family under 2924610-0030 / YN10V00005S156, with K3V112 internal parts such as the set plate and regulator assembly available against the same family.
Will a K5V140 pump fit an SK200-8?
No. K5V140 belongs to the heavier SK350-8 / SK330-8 class machines; the SK200-8 class uses the K3V112 pump family. Always confirm against the pump nameplate and machine serial number rather than the machine's tonnage description.
My Kobelco is slow on every function — is the pump worn out?
Not necessarily. Main pump delivery, the regulator that controls it, suction restriction and relief settings all produce the same symptom. A flow test plus standby and relief pressure readings separate a tired pump from a tired circuit, and it is worth doing before ordering an assembly.
Can you supply a pump repair kit instead of the complete assembly?
Yes. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes complete pump assemblies, rebuild parts (pistons, set plate, bearings, seals) and regulator assemblies separately. Tell us which option you need and include a pump nameplate photograph so the numbers are verified before shipment.