The first time a travel motor fails, most owners replace the assembly and get the machine back to work. The second time, on a machine that is otherwise sound, the arithmetic changes: a rebuild with the right internal parts costs a fraction of a new assembly, provided the parts are the right ones. That is where identification discipline decides the outcome, because travel motor internals are matched sets — a cylinder block fitted with a mismatched ball guide or swash plate will fail again quickly, and the failure will look like a bad rebuild rather than a mismatched pair. Guangzhou Shenyue Machinery Technology Co., Ltd. supplies both routes and this guide explains the internal part map.
What wears inside a travel motor
During normal operation the highest-wear components are predictable. The cylinder block and piston shoes wear on their sliding faces against the swash plate; the ball guide keeps the shoes in place and wears with them; the swash plate's surface develops scoring that raises internal leakage; and the relief valves, which protect the circuit from pressure spikes, wear at their seats and begin bypassing early. Each of these produces a different symptom, and separating them is what makes a rebuild worth doing.
Reading the symptoms
The internal part map
| Component | Commonly quoted references | Note |
|---|---|---|
| Travel motor assembly | GM85VA / LS15V00020F1 | Live stock row; confirm by plate |
| Travel motor relief | C2259321450501 / LC22V00006F1 | Live stock row |
| Cylinder block | C2162221251701 / LC15V00023S040 | Live stock row |
| Ball guide | C2162420488601 / LC15V00023S042 | Live stock row, matched to block above |
| Swash plate | C2162122059801 | Live stock row |
| Cylinder block (further family) | LQ15V00015R100-B+S | Live stock row |
| Travel motor assembly, 20 t class | GM38VB — YN15V00037F1 / F2 / F3 | SK200-8 / SK210-8 class; GM38VC is a different generation |
Note the paired references in the middle rows: a cylinder block and its ball guide belong to the same family and are supplied as such. That is not a commercial convenience; it is a functional requirement. The 20 tonne class illustrates the generation trap in the last row — the GM38VB and the GM38VC look like neighbours and are not interchangeable, and the -10 generation machines take a different family again.
What to send before a rebuild is quoted
The motor's own plate, the machine serial, the hours on the machine, and if possible the case drain condition. From the plate we identify the family; from the serial we confirm the generation; from the wear evidence we judge whether a rebuild is realistic. A housing that has been damaged by a failed rotating group cannot be rebuilt regardless of what parts are available, and knowing that in advance saves the cost of parts that never get used. Guangzhou Shenyue Machinery Technology Co., Ltd. asks for photographs of the plate and the internal wear surfaces on every rebuild enquiry for exactly that reason.
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 and the SK200 class page; Nabtesco's published product information at nabtesco.com is a useful reference for the travel motor families used across these machines.
Frequently Asked Questions
Rebuild or replace a Kobelco travel motor?
It depends on the housing and the rotating group. If the housing is sound and the failure is confined to wear parts, a rebuild with matched internals is a fraction of the cost of an assembly; if a failed group has damaged the housing, replacement is the only durable answer. Guangzhou Shenyue Machinery Technology Co., Ltd. asks for photographs of the plate and wear surfaces before advising.
Are cylinder blocks and ball guides sold separately?
They can be, but they must match. Our stock rows show pairs from the same family — C2162221251701 / LC15V00023S040 for the block and C2162420488601 / LC15V00023S042 for the ball guide. Fitting mismatched internals is the most common cause of a rebuild failing within weeks.
Is the GM38VB the same as the GM38VC?
No, and this is the trap on 20 tonne machines. The GM38VB family — YN15V00037F1 / F2 / F3 — covers SK200-8 and SK210-8 class machines, while the GM38VC is a different generation with its own numbers. Confirm from the plate on the motor, never from the machine's model year.
Why replace the relief valves during a rebuild?
Because they protect everything downstream and they wear quietly before they fail. A tired relief valve that bypasses early makes a correctly rebuilt motor feel soft, and the owner concludes the rebuild was poor. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes reliefs and rotating-group parts on separate lines so the decision is explicit.