Kobelco SK200-8 GM38VB Travel Motor: Internal Repair Parts and Rebuild Points That Decide the Outcome

A travel motor rarely fails politely. The SK200-8's Nabtesco GM38VB tends to announce trouble as a machine that pulls to one side, travels slower than its twin, or leaves steel glitter in the final drive oil — and by the time the symptoms are obvious, the internal parts have been contaminating each other for hours. Whether the job is a full assembly swap or an internal rebuild, the parts decision is where money is won or lost. This guide covers the verified GM38VB numbers and the rebuild points Guangzhou Shenyue Machinery Technology Co., Ltd. checks on every travel-motor enquiry.

The verified numbers: assembly and internals

Two levels of parts cover the GM38VB, both verified against live stock records:

Note the dual references on the internals — a 7-digit-style number and a YN-style number describe the same part depending on the quoting channel. And note the generation rule stated in the SK200-8 versus SK200-10 generation guide: the -10 generation's GM38VC (YN15V00083F1) is not interchangeable with the GM38VB, and neither are its internals. Every quotation from Guangzhou Shenyue Machinery Technology Co., Ltd. begins with the nameplate photograph, so a GM38VC never slips into a GM38VB order or the reverse.

Rebuild or replace? The honest arithmetic

A complete assembly (YN15V00037F1 / F2 / F3) wins when the housing is damaged, the drive interface is worn, or the machine is earning contract money that two days of downtime would eat. An internal rebuild wins when the damage is contained to identifiable components — and that is only knowable once the motor is opened and measured, not from the outside. The practical sequence that saves money:

1. Confirm the identification first. Nameplate photo, machine serial number, and the F-suffix your machine was built with. Order parts before opening the motor only if you already know the assembly number.
2. Open and measure. Check the rotating group for scoring, the valve plate interface for wear, and the bearings for play. Decide the parts list from what the calipers say, not from habit.
3. Match the parts to the measured damage. The verified GM38VB internals — 800D2103-00 / YN15V00037R420C and C800D2016-00 / YN15V00037S116 — cover the commonly replaced internal components; what else the rebuild needs depends on what the inspection finds.

Rebuild points that decide whether the repair lasts

• Cleanliness is the rebuild. Travel motors are closed baths of high-pressure oil. One scoop of grit in the housing ruins a fresh rotating group in hours. Wash the housing, flush the lines, and fit a new case-drain filter before startup.
• Seals are never reused. Every O-ring and shaft seal goes in new. A leaking shaft seal lets gear oil and water migrate between the motor and the final drive — a slow failure that destroys both assemblies.
• Check the final drive while the motor is off. Gear oil condition, pinion teeth, bearing play. A rebuilt GM38VB bolted to a starving final drive comes back on a hook. The paired guide our GM38VB travel motor guide covers the assembly side in full.
• Refill and bleed to specification. Correct case-drain routing and oil levels on startup; running a fresh motor dry for the first machine-move does damage no one can see until it is done.

How the order should be quoted

Send the nameplate photo or assembly number, the machine model and serial number, the quantity and your destination port. Quotations from Guangzhou Shenyue Machinery Technology Co., Ltd. return within 24 hours, with genuine, OEM-quality and aftermarket options listed on separate lines. Shenyue is an independent supplier and is not an authorized dealer or distributor of Kobelco Construction Machinery Co., Ltd.; genuine Kobelco parts are supplied through original supply channels alongside quality replacement alternatives, at prices close to agent level. Where a brand is formally authorized — Mitsubishi, Garrett, TONGMYUNG, Marusan and NIKURA — the authorization is stated.

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. Browse the hydraulic components page and the undercarriage and cylinders page, verify any reference in the part number search, and read the ordering workflow in how we order Kobelco parts by part number. For the verification habit behind every good travel-motor order, see the five-step verification checklist. Official parts data from Kobelco's official site remains the reference.

Frequently Asked Questions

What part numbers cover the GM38VB travel motor on the SK200-8?

The complete GM38VB assembly is quoted under YN15V00037F1 / F2 / F3 (revision suffix per machine build). Internal repair parts are quoted under 800D2103-00 / YN15V00037R420C and C800D2016-00 / YN15V00037S116. All references are verified against live stock at Guangzhou Shenyue Machinery Technology Co., Ltd.

Are GM38VB internal parts interchangeable with the GM38VC?

No. The GM38VC (YN15V00083F1) belongs to the SK200-10 / SK210-10 / SK220XD-10 generation and is not interchangeable with the GM38VB — neither as an assembly nor as internal parts. The nameplate photograph decides which family your machine takes.

When should I rebuild a GM38VB instead of replacing the assembly?

Rebuild when the inspection shows damage contained to identifiable internal components and downtime is affordable. Replace the assembly when the housing or drive interface is damaged, or when contract downtime costs more than the price difference. Measure inside the motor before committing — the calipers decide, not habit.

What should be inspected alongside a GM38VB rebuild?

The final drive: gear oil condition, pinion teeth and bearing play. Also replace every seal in the motor, flush the hydraulic lines, and fit a new case-drain filter before startup. Guangzhou Shenyue Machinery Technology Co., Ltd. provides the rebuild checklist with every internals order.