OTTO 278-6920 Travel Reduction Gearbox for Caterpillar CAT 312CL 312C Excavator Final Drive Assembly 2786920
As a complete final drive assembly, it offers direct OEM‑compatible replacement with identical port positions and mounting dimensions. Pre‑assembled and pre‑filled with gear oil, it enables fast, bolt‑on installation and reduces downtime significantly.
Technical Specifications
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Item
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Details
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Product Name
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OTTO 278‑6920 Travel Reduction Gearbox (Final Drive Assembly)
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Part Number
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278‑6920 / 2786920
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Material
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High‑strength alloy steel gears, forged steel housing, heavy‑duty bearings
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Application
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Caterpillar CAT 312C, CAT 312CL excavators
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Net Weight
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Approx. 145 kg
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Type
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Planetary‑type travel reduction gearbox (final drive assembly)
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Installation
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Bolt‑on, fits left/right track drives
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Warranty
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6–12 months (standard aftermarket)
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Key Product Advantages
OEM‑grade compatibility: Perfectly matches CAT 278‑6920 specs for direct replacement on 312C/312CL.
Heavy‑duty construction: Premium alloy steel gears and bearings resist wear in harsh digging conditions.
Pre‑assembled convenience: Factory‑sealed and pre‑lubricated for quick, no‑core installation.
Applications
Applicable Machine: This OTTO 278‑6920 travel reduction gearbox is exclusively designed for Caterpillar CAT 312C and CAT 312CL hydraulic excavators.
About Otto
Guangzhou Otto Engineering Machinery Equipment Co.,Ltd, is a leading manufacturer and distributor of earthmoving parts and equipment in Guangzhou, China. It consists of 3 sister companies, serving many well-known distributors at home and abroad. With more than 20 years of production and distribution experience, OTTO has cultivated an experienced engineer team and a professional sales team, which can ensure the highest service with the highest quality, competitive price and prompt delivery. At the same time, it also supplies parts to the Chinese market, and many Chinese trading companies order from our company.
Come with us, the best service, the best price, the best supplier you can enjoy !
Our Advantages
1.TECHNICAL SERVICE
We provide modification technology service, the product has been tested modifed, the engine can be directly installed and used.
2.CERTIFICATE
With Export certificate License.Double confirmation before shipping, if we sent the wroncparts we will send corect one.
3.SERVICE TEAM
With professional after-sale team, will help you to trace the goods. And our engineers will assist with any installation issues.
4.TECHNICAL SERVICE
Free Sample is acceptable.We serves manywell-known Hitachi Komatsu Caterpillar Kobelco in your country.

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At OTTO, we specialize in excavator machinery parts with a global clientele. Our superior products have garnered acclaim worldwide for their quality, durability, and precision engineering. Customers praise our extensive range of parts, from travel reduction gearboxes to hydraulic components, ensuring optimal performance. With a commitment to excellence, we offer top-notch warranties, secure shipping options, and efficient delivery times. Join our satisfied customers worldwide who rely on OTTO for top-tier excavator parts and exceptional service.
FAQ
Q1:What can you buy from us?
A:We are professional dealer in excavator parts, such as desel engine assy,hydraulic pump, hydraulic control valvetravel
motor,diesel fuel system,gearbox parts, swing gearbox motor parts, electrical parts, engine parts, used
excavator,etc.
Q2:How long is the warranted time?
A:For natural broken,Warranty 3-12 months any quality problem will offer support freely.
Q3:What's the shipping way you can offer?
A:(1) Big order: By sea or by air.(It can reduce the costs).
(2) Small order:DHL,TNT,UPS,FEDEX,EMS,ARAMEX.
Q4:What's the terms of the transaction?
A:EXW,FCA,FAS,FOB, C&F,CIF,CPT,CIP,DAF,DES,DDP.
Q5:How about the lead time?
A:(1) ln stock: 1-3 days.Always in 24 hours.
(2) Out of stock: lt's according to your quantity, and we have cooperated with factory,We will let you know when we quote.