Kobelco's 35 to 40 tonne class occupies an awkward but commercially important position. It is bought by aggregate producers, demolition contractors and heavy civil firms who need more reach and bucket capacity than a 30 tonne machine offers, but cannot justify a 46 tonne unit on transport width, site access or fuel. The SK380XD-10, SK380LC-10 and SK390LC-10 sit in that band. It is also the class where a wrong number hurts most, because these machines are thin on the ground in any one market and very little nearby is interchangeable. Guangzhou Shenyue Machinery Technology Co., Ltd. supplies this class from a shelf built around it.
Three numbers define the class
On a 38 tonne excavator the parts list is decided by three things, and none of them is the model name on the decal. Operating mass decides pump displacement and relief settings. Undercarriage width decides chain, roller and shoe references, and a long-underside variant of the same model takes a different set. Bucket size and linkage decide the pin, bushing and bucket-side numbers. Always send the mass class, the actual shoe width, and a photograph of the linkage.
What the SK-10 generation changed
The step from SK-8 to SK-10 on a machine this size is mostly engine and control electronics, not structure. Emissions-driven changes brought new engine hardware, additional sensors and a different control unit, while the mechanical platform — undercarriage, boom and arm, slewing ring — carried over with detail revisions.
Two consequences follow for buyers. A service order on an SK-10 class machine increasingly includes an electronic line item with no SK-8 equivalent. And a second-hand SK-10 with a replaced control unit may present a part number that does not match its build year, so the plate on the component matters more than the machine's model year.
System by system: the numbers we hold
| System | Commonly quoted numbers | Class note |
|---|---|---|
| Slewing ring | LC40F00027F1 | Catalogued for the SK380-10; confirm by serial |
| Swing motor | M5X180 class — LC15V00022F1 | Catalogued for the SK330-8; shared by the 30 t and above family |
| Slewing ring (smaller classes) | LQ40F00014F1, YN40F00042F2 | Catalogued for the SK250-8 and SK200-10 |
| Control unit | LC22E00336F8 / LC22E00323F8 | ECU controller catalogued for the SK350-10 |
| Arm bushing | LC12B02199P1 | Catalogued for the SK350-10; a wear item, not a one-off |
| Water pump | VH16100E0770 | Catalogued for the SK350-9 |
| Hydraulic pipe filter | LS50V01001S001 | Catalogued for the SK500-10 |
Three classes, three unrelated ring numbers, none derived from another. On a 38 tonne machine the ring is a crane job with the upper structure separated, so it is worth inspecting before a long campaign rather than after a noise develops.
Undercarriage and structure
Mechanical wear on a machine this size is load-driven rather than hour-driven. A 6,000 hour quarry machine can be further through its pins and bushes than a 10,000 hour machine that has spent its life on soft ground. Our shelf references include the idler shaft VA32F2303402 and the arm bushing LC12B02199P1. Inspect first, order second.
Buying this class without a stock-out
The economics are simple: an hour of downtime on a 38 tonne machine in a production quarry costs several times what it costs on a 20 tonne unit, so the cheapest part is the one that arrives with the rest of the order rather than the one with the lowest unit price. Build the enquiry as a system list — swing group, undercarriage, engine service, electronics — and consolidate it into one shipment.
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 of excavator parts and is not an authorized dealer or distributor 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. See the class page for the SK390LC, browse hydraulic components and undercarriage and cylinders, and read the machine reference data published by Kobelco.
Frequently Asked Questions
Which slewing ring does a Kobelco SK380-10 use?
The ring we hold catalogued for the SK380-10 is LC40F00027F1. It is not shared with smaller classes — our SK250-8 reference is LQ40F00014F1 and the SK200-10 reference is YN40F00042F2. Because the ring is stamped on the component, confirmation comes from the serial number and the stamping itself. Guangzhou Shenyue Machinery Technology Co., Ltd. asks for both before quoting.
Is the SK390LC-10 swing group the same as a 30 tonne machine?
The swing motor family overlaps at the 30 tonne mark: the M5X180 class, LC15V00022F1, is catalogued for the SK330-8, and the 35-40 t machines sit in the same wider family while the 20 tonne class runs the smaller M5X130 group. Travel motors on the largest machines are a larger family again. Confirm against the plate on the motor, not the model name.
What should a 35-40 tonne Kobelco quotation request contain?
Operating mass class, actual shoe width if the machine is a long-underside variant, a photograph of the bucket linkage, the slewing ring stamping, the swing and travel motor plates, and the machine serial. On this class the list is decided by mass, undercarriage width and linkage rather than by the model name, so a request built from the decal alone will often come back with wrong undercarriage or bucket-side items.
Why does an SK-10 class machine need electronic parts the SK-8 did not?
The SK-8 to SK-10 step on this class is mainly engine and control electronics, not structure. Emissions-driven changes added engine hardware, sensors and a different control unit — LC22E00336F8 / LC22E00323F8 is catalogued for the SK350-10 — while undercarriage, boom and arm largely carried over. An SK-10 service order therefore includes electronic lines with no SK-8 equivalent.