The twenty-tonne class built on Kobelco's -10 platform is now the backbone of rental fleets and municipal contracts, and the travel motor is the assembly that decides whether those machines keep earning. The trap is that the -10 motor is not a refreshed -8 motor. It is a separate generation with its own assembly number, and the two do not interchange. Nearly every wrong order our desk at Guangzhou Shenyue Machinery Technology Co., Ltd. sees on these machines begins with someone typing "SK200 travel motor" into a search box instead of reading the plate bolted to the unit.
The two generations side by side
| Machine class | Travel motor | Assembly numbers | What it means when ordering |
|---|---|---|---|
| SK200-8 / SK210-8 | Nabtesco GM38VB | YN15V00037F1 / YN15V00037F2 / YN15V00037F3 | Revision suffix matters; the three numbers are not decorative |
| SK200-10 / SK210-10 / SK220XD-10 | Nabtesco GM38VC | YN15V00083F1 | Different generation — not interchangeable with GM38VB |
What actually changed inside
Both units are two-speed travel motors of the same nominal class with an integrated parking brake, which is exactly why the confusion happens: on a pallet they look like the same part. The differences that matter sit in the rotary group and the interface — the cylinder block, piston and valve plate set, the brake stack arrangement, and the port and mounting detail. A GM38VB repair kit will not restore a GM38VC, and a complete GM38VC will not drop into an SK200-8 track frame without fabrication that nobody should be doing in the field. In practice, a machine that has been "converted" this way comes back with a tracking pull that no amount of relief adjustment will fix.
Three places to confirm what is on your machine
- The travel motor nameplate. This is the authority. It carries the assembly number and a motor serial, and the serial is what identifies the internal revision level.
- The machine serial plate. Useful for confirming platform, but a rebuild or a swap from a donor machine can make it lie about the motor.
- The parts catalogue page for that serial. Where the plate is unreadable, the serial narrows the page; it does not replace the plate.
What fails first on a -10 travel motor
- Output flange seal. Oil weeping onto the track frame and dust sticking to the hub. Early enough, it is a seal and a bearing check, not an assembly.
- Rotary group wear. Travel slows once the oil is hot, then recovers overnight. That pattern is internal leakage, not a pump problem.
- Parking brake. The machine creeps on a slope with the lever neutral. Brake plates and the piston seals are serviceable separately on most units.
- Case drain flow. Measured against the workshop manual figure, it is the single most useful number for deciding rebuild versus replace.
Repair parts: what is genuinely on the shelf
For the GM38VB generation we hold internal repair parts against confirmed numbers, including 800D2103-00 / YN15V00037R420C and C800D2016-00 / YN15V00037S116. For GM38VC internals, we quote against the motor serial and the nameplate; where an internal number is not yet confirmed for that serial, the quotation says "commonly quoted" in plain words rather than presenting a guess as a fact. That is a deliberate policy at Guangzhou Shenyue Machinery Technology Co., Ltd.: a quotation that admits uncertainty is cheaper than a container of parts that do not fit.
What to put in the inquiry
- Motor nameplate photograph, legible, including the serial line.
- Machine model and serial, plus the hour meter reading.
- The symptom in your own words: slow when hot, one track only, noise under load, oil loss.
- Whether you want a complete assembly, a rotary group, or seals only.
- Destination port, because a travel motor is heavy freight and the packing decision follows the route.
If you are working through a -8 to -10 comparison on the same machine, our SK200-8 versus SK200-10 generation notes cover the rest of the platform, and the hydraulic components range lists what we hold by system. For the -8 motor specifically, the GM38VB repair parts guide goes deeper into the internal numbers. Machine specifications should always be checked against Kobelco's official site for your serial.
Shenyue is an independent supplier. Kobelco is not one of our authorized brands; we supply genuine Kobelco parts ordered through original supply channels, plus quality replacement alternatives, and the condition of every item — genuine, OEM or aftermarket — is stated on the quotation.
Frequently Asked Questions
Can I use a GM38VB travel motor on an SK200-10?
No. The GM38VB serves SK200-8 and SK210-8 under assembly numbers YN15V00037F1, F2 and F3, while the SK200-10, SK210-10 and SK220XD-10 use the GM38VC under YN15V00083F1. The rotary group, brake stack and mounting detail differ, so the two generations are not interchangeable.
How do I know which travel motor my Kobelco has?
Read the nameplate on the travel motor itself, not the machine model badge. It carries the assembly number and a motor serial, and that serial identifies the internal revision. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes from the nameplate photograph, and where the plate is unreadable we ask for the machine serial as a second check.
Is it cheaper to rebuild the travel motor or replace the assembly?
It depends on the case drain measurement and on what the oil shows. A leaking output seal or a tired parking brake is normally a seal and bearing job; a rotary group that loses travel when the oil is hot usually means the group itself. Send the nameplate and the symptom, and the quotation will show both routes with the parts each one needs.
Do you stock GM38VC internal repair parts?
We hold internal parts for the GM38VB generation against confirmed numbers such as 800D2103-00 and C800D2016-00, and we source GM38VC internals against the motor serial. Anything not yet confirmed for your serial is marked commonly quoted on the quotation, with the nameplate as the final authority.