Travel motor trouble reaches our quotation desk in one of three sentences: "the machine pulls to one side", "the track will not hold on a slope", or "there is metal in the final drive oil". On the Kobelco SK200-8 class the motor behind those symptoms is usually a Nabtesco GM38VB — and the most expensive mistake buyers make is not the repair method, it is ordering the wrong generation of motor. This guide is the conversation the technical team at Guangzhou Shenyue Machinery Technology Co., Ltd. has with every buyer before a travel motor is quoted.
Which travel motor does a Kobelco SK200-8 use?
SK200-8 and SK210-8 class machines normally carry the Nabtesco GM38VB travel motor assembly, quoted under Kobelco assembly numbers YN15V00037F1, YN15V00037F2 and YN15V00037F3.
The following generation uses a different motor. SK200-10, SK210-10 and SK220XD-10 class machines normally carry the Nabtesco GM38VC, quoted under assembly number YN15V00083F1.
| Machine class | Travel motor | Assembly numbers |
|---|---|---|
| SK200-8 / SK210-8 | Nabtesco GM38VB | YN15V00037F1 / YN15V00037F2 / YN15V00037F3 |
| SK200-10 / SK210-10 / SK220XD-10 | Nabtesco GM38VC | YN15V00083F1 |
GM38VB and GM38VC are not interchangeable
These are two generations of motor, not two versions of one part. The rotary group and mounting detail differ, so a GM38VC cannot be fitted where a GM38VB belongs — and vice versa. Treating the part number as a "later model that also fits" is how a machine ends up standing still with the wrong motor on the floor.
Within the GM38VB family, the F1 / F2 / F3 suffix marks the revision level of the same assembly. A later revision usually supersedes an earlier one, but we still confirm which revision your machine was built with, because we quote the revision we will ship. That check takes one photograph — see the ordering section below.
Six symptoms, and what each one points at
- Track pulls to one side under load. Often a worn rotary group on the weak side, but check relief pressure and the travel control spool before condemning the motor — a sticking spool mimics it exactly.
- Machine drifts on a slope with the lever in neutral. Park brake or brake release problem, or leakage past the rotary group.
- Travel is fine cold and weak when the oil is hot. Classic internal leakage: clearances open up as viscosity drops.
- Metal or grey paste in the final drive oil. Bearing or gear damage inside the travel reduction — a separate assembly from the motor itself.
- Grinding or knocking that rises with track speed. Mechanical damage; stop using the machine before the shaft and housing are ruined.
- Excessive case drain flow. The single clearest measurement of wear inside the motor.
Diagnose before you condemn: four measurements
Travel motors are condemned too early far more often than they are missed. Four measurements settle the question:
- Case drain flow from the motor at operating temperature, compared with the specification for the unit.
- Travel relief pressure on both sides — a weak relief cartridge reads as a weak motor.
- Track speed comparison, left against right, with the machine on level ground and the same load.
- Park brake release pressure, plus an oil sample from the travel reduction. Milky or metallic oil points at the gearbox, not the motor.
Repair, rebuild or replace?
Three routes exist and they are priced very differently:
- Reseal. Shaft seal and O-ring set, where the only fault is external leakage.
- Rotary group rebuild. New pistons, valve plate, bearings and seals, where the housing, shaft and splines are still sound. Internal repair parts we record against the GM38VB include 800D2103-00 / YN15V00037R420C and C800D2016-00 / YN15V00037S116.
- Complete assembly. The economic choice when the shaft, splines or housing are damaged, or when downtime costs more than the price difference.
What to send for an accurate quote
Give us four things and the quotation is right the first time: a photograph of the travel motor nameplate, a photograph of the travel reduction nameplate, the machine serial number, and a description of the symptom in your own words. Guangzhou Shenyue Machinery Technology Co., Ltd. has supplied Kobelco parts since 2007, and nearly every wrong-order claim we have seen in twenty years traces back to a missing nameplate photograph rather than to a supplier error.
If you are also sourcing engine or undercarriage parts for the same machine, our part number search lists the numbers we hold against SK200-8 and SK210-8, and the SK200 parts page groups them by system. For the full all-brand range — Kobelco, Hino, Isuzu, Yanmar, Cummins and more — see our export site corbayparts.com.
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 is stated on the quotation. For machine specifications, Kobelco's official site remains the reference.
Frequently Asked Questions
Can I fit a GM38VC travel motor to an SK200-8?
No. The GM38VB used on SK200-8 and SK210-8 and the GM38VC used on SK200-10 / SK220XD-10 class machines are different generations with different rotary group and mounting detail. The travel motor nameplate, not the machine model name, is the authority when ordering.
What are the travel motor part numbers for a Kobelco SK200-8?
SK200-8 and SK210-8 class machines normally carry the Nabtesco GM38VB, quoted under assembly numbers YN15V00037F1, YN15V00037F2 and YN15V00037F3. Guangzhou Shenyue Machinery Technology Co., Ltd. confirms the revision level from your machine serial number before quoting.
Do I need to replace the travel reduction as well as the motor?
Usually not. The motor and the travel reduction gearbox are separate assemblies and are quoted separately. Metal in the gearbox oil or noise that rises with track speed points at the reduction; weak travel that worsens with hot oil points at the motor. Send both nameplates and we will tell you which one the symptom implicates.
How quickly can a travel motor ship?
Stock items leave our Guangzhou warehouse within days, and we send real photographs of the actual unit before it is packed. Please confirm the nameplate number and revision level first — shipping the wrong generation costs far more time than the check takes.