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A final drive in an excavator converts hydraulic power into the torque that turns the tracks. For a Hitachi EX200-5, the matching travel motor assembly carries stock code 9202120A, while the Hyundai R210-7 uses part number 31N6-40041. Match your machine's part number, sprocket holes, and frame holes to get the right fit.
When your excavator slows down, drifts to one side, or refuses to move, the problem often traces back to one component: the final drive in excavator systems rely on to convert engine power into track motion. This part takes a beating every single day, and replacing it correctly can mean the difference between a quick repair and weeks of downtime.
This guide walks you through how the final drive works, how to identify the right replacement for two of the most popular machines on job sites today—the Hitachi EX200-5 and the Hyundai R210-7—and what specs matter most when you place an order. Whether you run a fleet or maintain a single excavator, knowing your part numbers saves money and prevents costly mismatches.
The final drive sits at the end of the drivetrain, right where the track sprocket meets the undercarriage. It takes high-speed, low-torque output from the travel motor and converts it through a planetary gear set into the slow, high-torque rotation needed to move heavy machinery across mud, gravel, and uneven terrain.
Planetary drive gears must withstand the enormous torque generated by the engine and transfer those loads to move the equipment. Because of this constant stress, the gears need precise tolerances and proper heat treatment. A well-built unit uses a heat treatment process that increases bending strength, prevents case crushing, and delivers strong wear resistance for a long service life.
When a final drive starts to fail, you'll often notice grinding noises, oil leaks around the seals, or uneven track speed. Catching these signs early helps you avoid further damage to the travel motor and undercarriage.
The Hitachi EX200-5 is a 20-ton class crawler excavator that has stayed in service for decades, which means demand for replacement parts remains high. The travel motor assembly for this machine carries the stock code 9202120A.
When you source a hitachi final drive for this model, pay close attention to the sprocket and frame hole counts. These determine whether the unit will bolt directly onto your undercarriage without modification.
Here are the key specs for the Hitachi EX200-5 travel drive:
Specification | Detail |
Part Name | Travel Drive Travel Motor |
Equipment | Hitachi EX200-5 Excavator |
Stock Code | 9202120A |
Sprocket Holes | 16 |
Frame Holes | 14 |
Position | Travel Motor |
Condition | New |
MOQ | 1 piece |
Note that this assembly comes complete and ready to install, with the motor shaft and motor housing already fitted. The motor itself is sold separately, so confirm whether you need the full motor or just the reduction gearbox before ordering.
Hyundai's R-series excavators share many components across models, which can make ordering confusing. The R210-7 uses the same travel reduction gearbox as the R215-9 and R225-9, carrying part number 31N6-40041 and stock code 9208006.
This cross-compatibility is good news for fleet operators. If you run more than one Hyundai machine, a single part can cover several units, simplifying your inventory and reducing the number of unique SKUs you stock.
The table below outlines the core specifications for this Hyundai travel gearbox:
Specification | Detail |
Part No | 31N6-40041 |
Alternate No | 31Q6-40020 |
Stock Code | 9208006 |
Equipment | Hyundai R215-9, R225-9, R210-7 |
Sprocket Holes | 30 |
Frame Holes | 30 |
Position | Travel Motor |
Condition | New |
MOQ | 1 piece |
Notice the difference in hole counts between the Hitachi and Hyundai units. The Hyundai gearbox uses 30 sprocket holes and 30 frame holes, compared to the Hitachi's 16 and 14. This is exactly why matching part numbers matters—two units that look similar can have completely different mounting patterns.
This question comes up on nearly every parts order. OEM units carry the manufacturer's badge and price tag, while quality aftermarket parts offer the same fit and function at a lower cost.
Choose OEM if your machine is under warranty and the manufacturer requires genuine parts to keep that coverage valid. Choose a quality aftermarket hyundai final drive or Hitachi unit if cost matters more than the badge, and your machine is out of warranty.
The key with aftermarket parts is the manufacturer's process. Look for suppliers who produce all components in-house, use heat-treated planetary gears, and machine to precise tolerances. A reputable manufacturer will also back the unit with a warranty—typically 90 days from the date of arrival for transmission parts.
To avoid receiving a part that doesn't fit, gather this information before you reach out to a supplier:
Part number and stock code — the most reliable way to guarantee a match
Machine model and year — helps confirm cross-compatible variants
Sprocket holes — must match your existing sprocket bolt pattern
Frame holes — must align with your undercarriage mounting points
Motor included or not — some assemblies ship without the motor
Providing photos of your existing unit also helps the supplier verify the match. Most lead times run 4 to 7 days for in-stock items and 10 to 35 days for bulk production, depending on quantity.
Choosing the correct final drive comes down to one rule: match the part number, sprocket holes, and frame holes to your exact machine. The Hitachi EX200-5 and Hyundai R210-7 may both be 20-ton class excavators, but their travel drive components are not interchangeable.
If you're unsure which unit fits your machine, send your part number and a few photos to a trusted parts manufacturer. A supplier with in-house production and decades of experience can confirm the fit, quote a fair price, and ship a unit built to last. Start by gathering your machine's stock code today, then reach out for a quote.
Common warning signs include grinding or whining noises from the track, oil leaking around the drive seals, uneven track speed, or the machine drifting to one side. Addressing these early prevents damage to the travel motor and undercarriage.
The travel drive assembly with stock code 9202120A comes complete with the motor shaft and motor housing already installed, but the hydraulic motor itself is sold separately. Confirm what you need before ordering.
Yes. Part number 31N6-40041 fits the Hyundai R210-7, R215-9, and R225-9, which makes it a cost-effective choice for operators running more than one machine in this class.
Most quality aftermarket suppliers offer a 90-day warranty from the date of arrival, covering manufacturing and quality defects. Wear items like bearings and seals are often excluded, so check the terms before you buy.
In-stock items typically ship within 4 to 7 days for processing and packing. Bulk or custom orders take 10 to 35 days depending on quantity. Delivery is available by sea, air, or carrier worldwide.
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Hitachi EX200-5 & Hyundai R210-7 Final Drive Guide
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Find the right final drive for your Hitachi EX200-5 (9202120A) or Hyundai R210-7 (31N6-40041). Compare specs, sprocket holes, and order with confidence.
