Views: 0 Author: Site Editor Publish Time: 2026-07-10 Origin: Site
TL;DR:
A final drive is the travel reduction gearbox that converts hydraulic power into track movement on an excavator. BN Gears (Hongxiang Machinery) manufactures precision aftermarket final drives for leading brands including Hitachi ZX120–ZX870, Hyundai R210–R305, and Caterpillar 328D–340D. Matching your machine model and OEM part number is the most reliable way to order the correct replacement unit.
Excavator downtime is expensive. When a final drive fails on a Hitachi ZX280-3, a Hyundai R215-9, or a Caterpillar 336D, every hour the machine sits idle costs money. The challenge most fleet managers and equipment dealers face isn't knowing they need a replacement — it's knowing exactly which unit to order, what the part number is, and whether the aftermarket option will hold up under real working conditions.
This guide covers exactly that. You'll find model-specific part numbers, a quick-reference specification table, and a clear breakdown of what separates a reliable aftermarket final drive from a poor one. BN Gears, manufactured by Hongxiang Machinery Co., Ltd., has supplied precision travel reduction gearboxes since 2000 and covers 600+ construction machinery models. Here's what you need to know before placing an order.
A final drive — also called a travel device or travel reduction gearbox — sits inside the undercarriage sprocket hub of a crawler excavator. Its job is straightforward: take high-speed, low-torque hydraulic motor output and convert it into low-speed, high-torque track rotation. Without this planetary reduction system, the hydraulic motor alone couldn't generate enough torque to move a 20-ton machine.
Most excavator final drives use a two-stage planetary gear system. The first stage reduces input speed, and the second stage amplifies torque further before it reaches the sprocket. Each planet gear carrier, ring gear, sun gear, and bearing inside the housing must withstand enormous cyclical loads — which is why heat treatment of the gear teeth, manufacturing tolerances, and floating seal quality all directly affect service life.
BN Gears manufactures every internal component in-house across an 18,000 m² factory, with 8 senior engineers averaging 30+ years of experience in gear design and machining. Each unit passes through a heat treatment process that increases bending strength, prevents case crushing, and provides wear resistance for extended service intervals.
Hitachi excavators — from the compact EX30 to the large-class ZX870-3 — each require a travel device matched to the machine's frame hole count, sprocket configuration, and motor shaft specification. Ordering by machine model alone is not enough; confirming the OEM part number prevents costly mismatches.
For the hitachi final drive range, BN Gears stocks assemblies for models including the ZX120 (part 9180731/9181123), ZX200-3/ZX200-5G (part 9233692/9261222), ZX240-3/ZX250-3 (part 9243839/9256989), ZX280-3 (part 9255880/9256990, stock code 9202148), ZX330/ZAXIS330 (part 9212584/9232360), ZX450 (part 9263595/9251680), ZX650 (stock code 9202173), ZX850-3 (part 9219275/9251681), and ZX870-3 (part 9251681). All units ship completely assembled, with motor shaft and motor housing installed, and are ready to install without modification.
Each BN Gears Hitachi final drive assembly includes a 90-day warranty and ships in fumigation-free plywood casing. Units can be delivered by sea, air, or carrier, with in-stock orders dispatched within 4–7 business days.
Hyundai excavators are widely operated across Southeast Asia, the Middle East, and North America, making reliable aftermarket supply critical for dealers and fleet operators. For the hyundai final drive range, BN Gears covers the R210-7, R215-9, R225-9, R250LC-7, and R305LC-7 among others.
The Hyundai R215-9 and R225-9 travel gearbox uses part number 31N6-40041 (alternate: 31Q6-40020), with stock code 9208006. This two-stage planetary unit features 30 sprocket holes and 30 frame holes. The internal bill of materials includes a ring gear (XKAQ-00224), two bearing-main assemblies (XKAQ-00218), a floating seal (XKAQ-00219), planet gear carriers at both reduction stages, needle bearings, and hydraulic plug O-rings — all manufactured by BN Gears and covered under the standard warranty.
Minimum order quantity is one unit, and payment is accepted via T/T, Western Union, or Escrow. Trade terms are available on EXW, FOB, CFR, or CIF basis from Jiangmen Port.
The table below summarizes frequently ordered models across Hitachi, Hyundai, and Caterpillar excavator lines supplied by BN Gears.
Brand | Machine Model | OEM Part Number | BN Stock Code |
|---|---|---|---|
Hitachi | ZX120 | 9180731 / 9181123 | 9202118 |
Hitachi | ZX200-3 / ZX200-5G | 9233692 / 9261222 | 9202112 |
Hitachi | ZX280-3 / ZX280-5G | 9255880 / 9256990 | 9202148 |
Hitachi | ZX330 / ZAXIS330 | 9212584 / 9232360 | 9202140 |
Hitachi | ZX450 | 9263595 / 9251680 | 9202170 |
Hitachi | ZX870-3 | 9251681 | 9202180 |
Hyundai | R210-7 / R215-9 / R225-9 | 31N6-40041 / 31Q6-40020 | 9208006 |
Caterpillar | 328D / 336D / 336D2 / 336E | 2966184 / 296-6184 | 0152114HQ |
Caterpillar | 340D / 340D2 | 2966184 / 296-6184 | 0152114HQ |
Always verify the sprocket bolt count and whether your unit requires the motor to be included before placing an order. BN Gears units ship without the hydraulic travel motor unless otherwise specified.
Caterpillar excavators require tight dimensional tolerances across their planetary gear sets. The final drive caterpillar range supplied by BN Gears covers models including the 328D, 336D, 336D2, 336E, 340D, and 340D2, with the planetary gear assembly carrying part number 2966184 (296-6184) and BN stock code 0152114HQ.
All planetary gears in the BN Gears CAT-compatible range are machined to precise tolerances, heat treated for surface hardness, and inspected before packaging. Units arrive new and undamaged, and can be painted or unpainted based on customer preference. For bulk orders, production lead time ranges from 10 to 35 days depending on quantity.
Aftermarket doesn't mean lower quality — provided the manufacturer controls its own production. BN Gears (Hongxiang Machinery) holds ISO 9001:2015 certification and maintains in-house machining across 80+ production units. The company has supplied long-term to partners including Foster Wheeler Power Machinery Co., Ltd., and holds a 65% market share across Southeast Asia, with established distribution in the Middle East, Europe, North America, South America, and Russia.
For procurement teams deciding between OEM and aftermarket: choose BN Gears when lead time, price competitiveness, and broad model compatibility matter more than OEM branding. For machines still under manufacturer warranty or requiring certified parts for compliance reasons, OEM sourcing remains the appropriate route.
Match your machine model (e.g., ZX280-3) to the OEM part number stamped on the existing unit or listed in the machine's parts manual. For Hitachi ZX280-3, the correct travel device part is 9255880 or 9256990, with BN stock code 9202148. Always confirm the sprocket hole count before ordering.
No. BN Gears final drive assemblies ship with the motor shaft and motor housing pre-installed, but without the hydraulic travel motor itself. The unit is complete and ready to install once your existing motor is fitted.
BN Gears provides a 90-day warranty from the date of arrival. Warranty covers manufacturing defects. It does not cover damage from incorrect installation, overloading, or orders placed with an incorrect part number.
In-stock units are dispatched within 4–7 business days. Bulk production orders require 10–35 days depending on quantity. Delivery is available by sea, air, or carrier from Jiangmen Port, China.
Yes. BN Gears stocks a broad range of internal gearbox spare parts including planet gears, ring gears, sun gears, carrier assemblies, needle bearings, floating seal groups, motor housings, and sprocket hubs — for Hitachi, Hyundai, Caterpillar, Komatsu, Volvo, Kobelco, and many other brands.
The minimum order quantity is one unit for most final drive assemblies. Contact BN Gears directly at info@hx-machinery.cn for volume pricing.
Matching the right final drive to your excavator reduces installation time, extends service life, and keeps your fleet productive. BN Gears covers 12,000+ parts across 600+ machine models and ships globally. For sourcing inquiries, model-specific part matching, or bulk pricing, contact Hongxiang Machinery Co., Ltd. directly. Email:info@hx-machinery.cn
