Top 20 Amphibious Excavator Manufacturers in the World: 2026 Pontoon & OEM Buyer Guide

Last updated: October 2026 · Reviewed by: Hefei Liehuang Machinery Co., Ltd. Technical Inspection Team

Disclosure: Hefei Liehuang Machinery Co., Ltd. (lhusedexcavator.com) published this 2026 buyer comparison. We inspect and export pre-owned 6 to 36 ton crawler excavators from China. Dredging contractors frequently mount our inspected upper structures onto new amphibious pontoon undercarriages. We do not manufacture new OEM pontoons, and all 20 companies below are evaluated from official technical documentation.

How We Selected These Amphibious Excavator Manufacturers

Twenty independent amphibious excavator manufacturers across the 5 to 45 metric ton class earned a spot in this 2026 ranking. We divided the suppliers into 13 specialist pontoon undercarriage builders and 7 global excavator OEMs. Every listed company publishes verifiable pontoon dimensions, hydraulic flow ratings, steel grades, or ISO 9001 quality records on its official website. Pure used equipment brokers, auction marketplaces, rental-only depots, and directories were excluded. Company information and 5–45 ton amphibious specifications were verified against official manufacturer websites and technical catalogs in October 2026.

Why separate pontoon specialists from conventional construction machinery OEMs? Standard crawler excavators sink immediately in marshy terrain, tidal mudflats or flooded river deltas. An amphibious excavator replaces steel crawler tracks with sealed buoyant pontoons that work efficiently on land and water. Specialist builders engineer those hydraulic undercarriage pontoons for floatation, durability and strength, and low ground pressure. Meanwhile, major OEMs build the revolving cab, engine, and hydraulic systems, and many fleets mount inspected 10 to 30 ton medium excavators for sale onto new pontoons.

Global Amphibious Excavator Manufacturers Comparison Table (2026)

The nine-column matrix below compares the top 20 amphibious excavator manufacturers across the USA, The Netherlands, Finland, Malaysia, Singapore, China, and Japan. Buyers can evaluate each manufacturer based on their location of headquarters, year of establishment, intended wetland application, flagship models, key strengths and commercial trade-offs.

North American & European Specialist Pontoon Builders (Companies 1–7)

North American and European specialist builders made the modern marsh buggy and CE-certified floating excavator. Working across the Louisiana Gulf Coast, Dutch polders, and Finnish peatlands, these seven companies build high-buoyancy undercarriages for 5 to 45 ton OEM upper bodies. Each builder applies a unique design to its pontoon nose profile and internal watertight bulkheads for deep silt and ecologically sensitive areas.

1. Wilco Manufacturing LLC: Best for Gulf Coast pipeline, levee, and coastal restoration contractors needing heavy-duty US-built pontoon undercarriages paired with 8 to 40 ton OEM upper structures

Headquarters: Lafayette, Louisiana, United States · Founded: 1971 · Company Type: Specialist Amphibious Undercarriage & Marsh Buggy OEM

Website: https://www.wilcomarshbuggies.com/

Main Products: Wilco Amphibious Excavators (8t to 40t class), Hydraulic Spud-Equipped Pontoons, Personnel & Cargo Marsh Buggies

Manufacturing Capabilities: Multi-compartment sealed steel pontoons, heavy-duty roller chain drive, hydraulic extendable width frames, and supplementary pontoons with dual spud piles

Certifications: AWS D1.1 structural welding compliance and US Gulf Coast marine fleet safety standards according to its website

Notable Work: Wilco integrates OEM upper structures from Caterpillar, John Deere, SANY, and Komatsu onto custom-engineered marsh pontoon undercarriages. Optional side pontoons with hydraulically driven spud anchors stabilize 20 to 35 ton excavators in open water up to 4 meters deep.

Wilco Manufacturing has engineered heavy marsh machinery in Lafayette since 1971. Its sealed steel pontoons carry upper structures from 8 to 40 metric tons across coastal Louisiana levees. Crew members can equip the hull with supplementary side pontoons and hydraulic spud piles for 4-meter water depths. Custom pontoon fabrication in Louisiana carries longer export lead times and higher USD pricing than standardized Asian builds.

2. Wetland Equipment Company: Best for Contractors requiring patented Direct Drive multi-motor pontoon propulsion and expandable-width undercarriages for 5 to 60 ton excavators

Headquarters: Thibodaux, Louisiana, United States · Founded: 1986 · Company Type: Specialist Amphibious Excavator & Pontoon Undercarriage Manufacturer

Website: https://wetlandequipment.com/

Main Products: 9100, 9200, and 9300 Series Amphibious Undercarriages (supporting CAT 308, CAT 320, CAT 330, and Deere 210G uppers), Amphibious Cargo Carriers

Manufacturing Capabilities: Synchronized direct-drive hydraulic motors per pontoon, hydraulically expandable undercarriage frames, and marine-grade Corten steel hull plating

Certifications: US Patent portfolio on amphibious pontoon drive assemblies and ISO-aligned structural quality controls according to its website

Notable Work: Wetland Equipment hydraulic expandable undercarriages retract for legal lowboy highway transport without crane disassembly. Internal watertight bulkheads divide each pontoon into independent compartments so a single hull puncture won’t sink the machine.

Wetland Equipment Company replaces exposed roller chains with a patented multi-motor hydrostatic direct-drive system. That drivetrain represents a major advancement over single-sprocket chain drives in submerged timber. Each pontoon houses synchronized hydraulic motors that pull smoothly through thick coastal marsh. Hydraulic cylinders retract the 9100, 9200, and 9300 Series frames for legal highway trailer transport. Direct-drive track hubs require clean hydraulic filtration and specialized replacement seals in remote camps.

3. Waterking B.V.: Best for European and international wetland contractors seeking CE-certified WK-series amphibious excavators from 8 to 40 tons

Headquarters: Zuidbroek, Groningen, Netherlands · Founded: 2005 (Knoop dredging contracting heritage since 1989) · Company Type: European Amphibious Excavator & Dredging Equipment OEM

Website: https://waterking.nl/

Main Products: WK 20, WK 40, WK 80, WK 90, WK 150, WK 220 (22t class), WK 250, WK 300, and WK 400 Amphibious Excavators

Manufacturing Capabilities: S355J2 / Corten steel pontoons, triple-strand heavy polymer/steel track chains, modular side pontoons with 6 to 9 meter spud poles, and Doosan/Develon or Cat uppers

Certifications: CE Machinery Directive 2006/42/EC compliance, ISO 9001, and VCA** European safety standards according to its website

Notable Work: The WK 220 and WK 300 models feature hydraulically adjustable pontoon track gauge and quick-pin side pontoons for deep-water dredging. Every Waterking design is field-validated in the company’s own Dutch wetland and waterway maintenance contracting fleet before commercial sale.

Waterking B.V. grew out of the Knoop family dredging business in the Netherlands. That field background shapes every WK-series amphibious excavator from 8 to 40 tons. Builders weld the hulls from S355J2 and weathering Corten steel to resist brackish estuary corrosion. Quick-pin side pontoons make the undercarriage adaptable to narrow polder canals and wide tidal flats. European factory pricing in EUR and Stage V engine rules raise upfront costs for non-EU buyers.

4. Remu Oy: Best for Northern European, Baltic, and North American civil contractors needing cold-climate Big Float amphibious excavators for peat bogs and ice-breaking

Headquarters: Ähtäri, Finland (US distribution hub in Wisconsin) · Founded: 1995 · Company Type: Finnish Amphibious Excavator (Big Float) & Screening Bucket OEM

Website: https://www.remu.fi/

Main Products: Big Float E80, Big Float E150 (14t to 16t class), Big Float E220 (20t to 24t class) Amphibious Excavators and Undercarriage Kits

Manufacturing Capabilities: High-tensile Nordic structural steel pontoons, hydraulic width extension from 3.0 m transport width to 5.3 m working stance, and twin anchor spuds

Certifications: ISO 9001 quality management and European CE compliance at Ähtäri manufacturing plant according to its website

Notable Work: Big Float pontoons narrow hydraulically on the trailer bed so contractors can move a 22-ton amphibious excavator without police escort vehicles in most jurisdictions. Reinforced bow angles allow Big Float machines to break surface ice and climb over submerged timber in boreal peatlands.

Remu Oy builds its Big Float amphibious excavators in Ähtäri, Finland for northern peat bogs and tailing ponds. On a lowboy trailer, a Big Float E220 retracts its pontoons to a 3.0-meter transport width. Once on site, hydraulic cylinders push the pontoons out to a 5.3-meter stance for floating stability. Low contact pressure allows wetland work with minimal disruption to sensitive root mats. Remu concentrates its Big Float line on 8 to 25 ton carriers rather than 40-ton coastal dredgers.

5. Bell Dredging Pumps B.V.: Best for Dredging and tailings pond operators who want an amphibious excavator pre-integrated with hydraulic slurry dredge pumps and cutter heads

Headquarters: Schagen, North Holland, Netherlands · Founded: 2000 · Company Type: Dutch Amphibious Undercarriage & Submersible Dredging Pump OEM

Website: https://belldredgingpumps.com/

Main Products: BellTrex 5-6 Ton, 8-10 Ton, 14-16 Ton, and 20-25 Ton Class Amphibious Excavators; Excavator-Mounted Dredge Pumps (BPH Series)

Manufacturing Capabilities: Custom amphibious tracked pontoons matched with CAT or Hitachi upper structures, auxiliary hydraulic circuits for cutter-suction heads, and spud legs

Certifications: CE Marking and ISO 9001 quality management for Dutch-built dredging and amphibious machinery according to its website

Notable Work: Bell engineers both the amphibious pontoon undercarriage and the boom-mounted hydraulic slurry pump, avoiding hydraulic flow mismatches. Compact 5-6 ton class units mount CAT 303.5E or 305 uppers onto low-draft pontoons for narrow urban canals and golf course ponds.

Bell Dredging Pumps B.V. combines Dutch amphibious undercarriage engineering with in-house submersible slurry pumps. This single-source package matches auxiliary hydraulic flow directly to the cutter head or BPH dredge pump. Compact 5 to 6 ton models use Caterpillar 303.5E uppers to clean narrow urban canals. Biodegradable oil options support ecological restoration projects across European nature reserves. Standard stock focuses on 5 to 20 ton classes, while heavy 30+ ton units are built to order.

6. Wilson Marsh Equipment Co.: Best for US wetland, mosquito control, and right-of-way contractors needing sub-13-ton amphibious excavators that haul in one piece under 12 to 16 feet wide

Headquarters: Harvey, Louisiana, United States · Founded: 1966 · Company Type: US Marsh Excavator, Cargo Buggy & Slide Pontoon Manufacturer

Website: https://www.wilsonmarshequipment.com/

Main Products: Wilson Bobcat E35, Bobcat E50, CAT 306, Bobcat E85.5, CAT 308 Telescopic, and CAT 313 Amphibious Excavators; Wilson Cargo Carrier

Manufacturing Capabilities: Telescopic pontoons retracting from 13 ft 10 in working width to 11 ft 10 in transport width, aluminum or steel cleats, and 15,000 lb recovery winches

Certifications: US-engineered structural pontoon weld fabrication and DOT-friendly transport width designs according to its website

Notable Work: The Wilson Telescopic CAT 308 operates at 13 ft 10 in wide for marsh stability and retracts hydraulically to 11 ft 10 in for low-cost highway hauling. All standard models from the Bobcat E35 up to the 13-ton CAT 313 stay under 16 feet wide to eliminate field pontoon disassembly.

Wilson Marsh Equipment Co. has built lightweight marsh excavators and cargo buggies in Harvey, Louisiana since 1966. By focusing on Bobcat E35, E50, and Caterpillar 306, 308, and 313 platforms, Wilson keeps overall width below 12 to 16 feet. Operators drive the Telescopic CAT 308 off a trailer and expand the tracks hydraulically in minutes. The standard catalog caps at the 13-ton Wilson CAT 313 class. Buyers needing 20 to 30 ton high-reach dredgers must request custom builds or choose larger OEMs.

7. Marsh Buggies, Inc.: Best for Oilfield, pipeline, and seismic contractors seeking pioneer Louisiana marsh pontoon engineering with both sale and rental fleet backing

Headquarters: New Orleans / Harvey, Louisiana, United States · Founded: 1938 · Company Type: Pioneer Amphibious Marsh Buggy & Pontoon Excavator Manufacturer

Website: https://www.marshbuggies.com/

Main Products: MBI Amphibious Hydraulic Excavators (Mini to 30t+ Class), Amphibious Personnel Carriers, Draglines, and Spud Barges

Manufacturing Capabilities: Heavy-wall steel pontoon hulls, multi-strand marsh track chains, custom long-reach booms, and supplementary side pontoons with spud wells

Certifications: Over 85 years of US patent heritage and oilfield HSE compliance across Gulf Coast marsh operations according to its website

Notable Work: Founded in 1938 in Louisiana, MBI invented the original amphibious marsh buggy for swamp seismic exploration and coastal canal dredging. MBI fabricates custom pontoon undercarriages for 6 to 35 ton excavators with optional hydraulic winches and side pontoons.

Marsh Buggies, Inc. pioneered the modern amphibious marsh buggy in New Orleans back in 1938. Over eight decades of Gulf Coast oilfield work, MBI refined heavy-wall pontoon hulls that survive oyster reefs and cypress swamps. Alongside custom manufacturing, the company operates one of North America’s largest amphibious rental fleets. Primary engineering focus centers on Gulf Coast marsh conditions rather than container export kits.

What Is the Difference Between a Specialist Pontoon Undercarriage Builder and an OEM Upper-Structure Manufacturer?

A specialist pontoon builder designs and welds the sealed lower hull, track chains, cleats, and spud piles, focusing on manufacturing amphibious undercarriages that float on water and on land. By contrast, an OEM upper-structure manufacturer like Caterpillar, Hitachi, or Komatsu builds the revolving cab, diesel engine, boom, and main hydraulic pumps that mount onto that pontoon landing gear.

Asian & Malaysian Specialist Amphibious Undercarriage Builders (Companies 8–13)

Malaysian, Singaporean and Chinese specialists in amphibious excavators are the biggest exporters for modern infrastructure and coastal flood control. Because Southeast Asian palm plantations, mangrove restoration zones, and river deltas demand constant swamp mobility, these six builders engineer modular pontoons that ship inside standard ocean containers while delivering exceptional versatility.

8. EIK Engineering Sdn. Bhd.: Best for Global dredging and palm-plantation contractors wanting patented multi-synchronous direct-drive pontoons made of Corten weather-resistant steel

Headquarters: Johor Bahru, Johor, Malaysia (US hub EIK Solutions in Houston, Texas) · Founded: 2007 · Company Type: Global Amphibious Excavator & Long-Reach Boom Specialist OEM

Website: https://www.eikengineering.com/

Main Products: AM80 (7-8t), AM140 (12-14t), AM200 / AM220 (20-22t), AM250 (25t), AM300 (30t), and AM350 (35t) Amphibious Excavators

Manufacturing Capabilities: Patented Multi-Synchronous Direct Drive (quad hydraulic motors), atmospheric corrosion-resistant Corten steel hulls, and hydraulic extendable pontoons

Certifications: ISO 9001:2015 certified manufacturing in Johor Bahru and international patents on synchronous pontoon drive systems according to its website

Notable Work: The flagship AM200 and AM220 use four synchronized hydraulic travel motors driving three heavy-duty chains per pontoon for balanced torque in sticky clay. Polymer-composite and high-yield steel track cleats paired with Corten steel hulls resist brackish coastal water corrosion.

EIK Engineering Sdn Bhd operates a modern ISO 9001:2015 factory in Johor Bahru alongside its Houston service hub. Its patented Multi-Synchronous Direct Drive places four hydraulic motors inside each pontoon to equalize chain tension. EIK fabricates its AM200 and AM220 hulls from Corten steel for long life in coastal mangroves. Customers ordering complete machines register upper-structure engine warranties through their local Caterpillar, Hitachi, or Komatsu dealer.

9. Ultratrex Machinery Sdn. Bhd.: Best for Southeast Asian, African, and Australian river-clearing and mine-tailings contractors needing 7 to 45 ton AT-series swamp excavators

Headquarters: Batu Pahat, Johor, Malaysia · Founded: 2003 · Company Type: Specialist Amphibious Excavator, Swamp Dozer & Dredger OEM

Website: https://www.ultratrex.com.my/

Main Products: AT75 (7.5t), AT130 (13t), AT200 (20t), AT220 (22t), AT300 (30t), and AT450 (45t) Amphibious Excavators; Amphibious Transporter AT-C Series

Manufacturing Capabilities: High-tensile wear-resistant bottom hull plates, sealed oil-bath roller chains, hydraulic telescopic crossbeams, and side pontoons with 6 m spuds

Certifications: ISO 9001:2015 quality certification and CE compliance across its 20,000 m2 Batu Pahat production facility according to its website

Notable Work: Ultratrex AT200 and AT220 pontoons achieve ground pressures as low as 11 to 14 kPa (1.6 to 2.0 psi) for deep peatland and mangrove work. Modular knockdown pontoon geometry allows the 20-ton AT200 undercarriage and long-reach front to ship inside standard 40HQ containers.

Ultratrex Machinery Sdn Bhd manufactures AT-series amphibious excavators and swamp dozers in Batu Pahat, Malaysia. Its 20-ton AT200 and 22-ton AT220 models reduce ground pressure to 11 to 14 kPa on soft palm-oil peatlands. Knockdown crossbeams allow export crews to pack the pontoons and long-reach boom inside standard 40-foot containers. Heavy AT300 and AT450 models require 40-foot flat-rack containers and port crane lifts for ocean freight.

10. Jiangsu River Heavy Industry Co., Ltd.: Best for Cost-focused international buyers sourcing complete 8 to 40 ton amphibious excavators or bolt-on pontoon undercarriages from China

Headquarters: Changzhou, Jiangsu, China · Founded: 2001 · Company Type: Chinese Amphibious Excavator & Long-Reach Attachment Manufacturer

Website: https://www.riverexcavator.net/

Main Products: RW80 (8t), RW150 (15t), RW210 / RW220 (20-22t), RW250 (25t), RW300 (30t) Amphibious Excavators; Pontoon Undercarriages

Manufacturing Capabilities: Q355B and HG785 high-strength steel pontoons, triple heavy pitch chains, 15.5 m long-reach dredging booms, and optional hydraulic spud pontoons

Certifications: ISO 9001 quality management system and CE certification for export amphibious undercarriages according to its website

Notable Work: River Heavy Industry supplies both complete RW210/RW220 machines and standalone pontoon undercarriages pre-drilled for CAT, Komatsu, Hitachi, and SANY swing bearings. A 15.5-meter two-piece long-reach front paired with a 0.45 m3 ditching bucket comes factory-plumbed on 20-ton class builds.

Jiangsu River Heavy Industry Co., Ltd. has exported complete swamp excavators and bolt-on pontoons from Changzhou since 2001. Buyers can purchase a turnkey RW210 machine or order standalone pontoons pre-machined for Caterpillar, Komatsu, Hitachi, or SANY swing bearings. Factory packages include 15.5-meter long-reach booms and hydraulic spud pontoons for river desilting. Overseas buyers must specify steel grade and travel motor brand in the contract to prevent domestic-spec substitutions.

11. Powerplus Group Inc.: Best for Developing-market fleet operators procuring turnkey PP220E-AM swamp excavators alongside graders, dozers, and dump trucks from one supplier

Headquarters: Singapore (Global Operations Hub) & Anaheim, California, United States · Founded: 1970 · Company Type: Multi-Line Heavy Equipment & Amphibious Swamp Excavator OEM

Website: https://www.powerplus.us/

Main Products: PP140E-AM (14t), PP220E-AM (22t), PP240E-AM (24t), and PP300E-AM (30t) Amphibious Swamp Excavators

Manufacturing Capabilities: Cummins B5.9 / Isuzu 6BG1 mechanical/electronic engines, sealed three-compartment steel pontoons, and corrosion-coated marine track shoes

Certifications: ISO 9001 quality management system and global export compliance across 100+ countries according to its website

Notable Work: The 22-ton PP220E-AM ships as a complete factory-matched amphibious excavator with Cummins or Isuzu power rather than a third-party kit conversion. Simplified Tier 2 / Tier 3 mechanical fuel injection options tolerate high-sulfur field diesel in remote African and Southeast Asian river basins.

Powerplus Group Inc. supplies complete PP140E-AM, PP220E-AM, and PP300E-AM swamp excavators across more than 100 countries. Unlike boutique shops that only sell lower frames, Powerplus delivers a single-brand machine powered by Cummins or Isuzu engines. Three-compartment sealed pontoons and mechanical fuel pumps make the PP220E-AM popular in remote African and Southeast Asian river basins. Because Powerplus markets a broad equipment catalog, deep-water spud systems are less customizable than at boutique marsh builders.

12. Qingdao Relong Technology Co., Ltd.: Best for Waterway maintenance contractors combining an amphibious multi-purpose excavator with interchangeable rake, bucket, cutter-suction pump, and piling tools

Headquarters: Qingdao, Shandong, China · Founded: 2008 · Company Type: Specialist Amphibious Multi-Purpose Dredger & Pontoon Excavator OEM

Website: https://www.relongdredger.com/

Main Products: Relong RL-AM Series Amphibious Excavators (8t to 30t), Amphibious Multipurpose Dredgers (Watermaster-style), and Hydraulic Cutter Suction Dredgers

Manufacturing Capabilities: CCSB marine ship-plate pontoons, 4-spud self-walking stabilizers, quick-coupler hydraulic slurry pumps (up to 600 m3/h), and propulsion thrusters

Certifications: ISO 9001, CE certification, and Bureau Veritas (BV) marine fabrication inspection options according to its website

Notable Work: Relong’s amphibious units switch between backhoe bucket digging, cutter-suction pumping, and aquatic weed raking using an auxiliary high-flow manifold. Four independent hydraulic spud legs allow the hull to step forward and anchor securely in flowing river currents up to 4.5 meters deep.

Qingdao Relong Technology Co., Ltd. bridges the gap between tracked amphibious excavators and cutter-suction dredgers. Its RL-AM series uses CCSB marine ship plate and four hydraulic spud legs to walk into rivers up to 4.5 meters deep. Operators can swap a backhoe bucket for a 600 m3/h slurry pump or weed rake in thirty minutes. That quick-change hydraulic manifold makes each carrier versatile across silt pumping and reed harvesting. Relong specializes in waterway dredgers rather than dry-land quarry excavation.

13. Sinoway Industrial (Shanghai) Co., Ltd.: Best for Project engineering firms ordering customized SWSC210 and SWSC230 swamp excavators configured for container shipment to Africa and South America

Headquarters: Pudong, Shanghai, China · Founded: 2006 · Company Type: Special-Purpose Swamp Excavator & Heavy Engineering Equipment Exporter

Website: https://www.sinowaysh.com/

Main Products: SWSC80 (8t), SWSC140 (14t), SWSC210 (21t), SWSC230 (23t), and SWSC300 (30t) Swamp & Amphibious Excavators

Manufacturing Capabilities: Cummins 6BT5.9 / QSB6.7 engines (112 to 133 kW), Kawasaki hydraulic pumps, three-cell sealed pontoons, and detachable side pontoons with spuds

Certifications: ISO 9001:2015 quality management and CE certification for special-purpose construction machinery according to its website

Notable Work: The SWSC210 and SWSC230 pair Cummins six-cylinder turbo engines with oversized sealed pontoons delivering 14.5 kPa ground pressure. Sinoway offers both fixed-frame and hydraulically extendable pontoon widths to match local low-loader trailer rules.

Sinoway Industrial (Shanghai) Co., Ltd. engineers SWSC210 and SWSC230 swamp excavators for container shipping. Each 21-to-23-ton build pairs a Cummins 6BT5.9 or QSB6.7 engine with Kawasaki main pumps and three-cell watertight pontoons. Buyers select 2.2-meter fixed-width crossbeams for container shipping or hydraulic telescopic frames for lowboy highway trailers. As an export engineering house, Sinoway supports fleets through shipped spare parts kits rather than local dealerships.

How Do US Marsh Buggy Builders Compare With Malaysian and Chinese Amphibious Manufacturers on Pontoon Steel, Drive Chains, and Price?

US Gulf Coast builders like Wilco, Wetland Equipment, and MBI fabricate heavy-wall pontoons tailored for oilfield pipelines and levee work. Complete 20-ton US units cost $280,000 to $450,000 ex-works and use heavy imperial roller chains or hydrostatic direct-drive hubs. Malaysian builders like EIK and Ultratrex use Corten weathering steel and quad-motor synchronous drives at $165,000 to $260,000 per complete machine. Chinese builders like River Heavy Industry, Relong, and Sinoway supply Q355B or CCSB marine-steel pontoons at $35,000 to $65,000 for the undercarriage alone, reducing capital outlay by 40% to 55%.

Global OEM Upper-Structure & Full-Machine Manufacturers (Companies 14–20)

A reliable revolving upper structure is needed to drive heavy pontoon tracks and long-reach dredging booms. Pulling triple-strand pontoon chains through saturated clay while swinging a 15-meter front demands 400 to 445 L/min of main-pump hydraulic flow. For standard crawler specs, see our global 10 to 30 ton medium excavator manufacturers guide.

14. Caterpillar Inc.: Best for Contractors demanding the industry’s most widely supported 20 to 30 ton upper structures (Cat 320, 323, 330) for amphibious pontoon conversions

Headquarters: Irving, Texas, United States · Founded: 1925 · Company Type: Public Heavy Equipment OEM & Primary Amphibious Upper-Structure Supplier (NYSE: CAT)

Website: https://www.caterpillar.com/

Main Products: Cat 308 (8t), Cat 313 (13.8t), Cat 320 (22.6t), Cat 323 (25.5t), Cat 330 (30.9t), and Cat 336 Upper Structures & Long-Reach Excavators

Manufacturing Capabilities: Cat C4.4 and C7.1 engines (117 to 128.5 kW on Cat 320), 429 L/min electro-hydraulic main pump flow at 35 MPa, and OEM Custom Solutions upper-only packages

Certifications: ISO 9001, ISO 14001, EPA Tier 4 Final / EU Stage V and Tier 3 equivalent global engine certifications according to its website

Notable Work: The Cat 320 delivers 429 L/min hydraulic flow and high swing torque (82 kN-m), providing ample oil supply for high-displacement pontoon travel motors. Used Cat 320D, 320GC, and 320 Next Gen upper structures are the #1 global base platform for cost-effective amphibious pontoon conversions.

Caterpillar Inc. provides the world’s most popular upper-structure platform for 20 to 30 ton amphibious conversions. Through Cat OEM Solutions and pontoon partners, contractors mount Cat 313, Cat 320, and Cat 330 uppers onto sealed marsh undercarriages. With 429 L/min of hydraulic flow, a used Caterpillar 320 crawler excavator easily powers dual pontoon travel motors and a 15-meter dredging front. Caterpillar doesn’t build floating pontoons in-house, so buyers pair Cat uppers with Wilco, Wetland, or EIK undercarriages.

15. Hitachi Construction Machinery Co., Ltd.: Best for Dredging and slope-finishing operators wanting smooth 3-pump TRIAS hydraulics on ZX200 / ZX210 upper structures mounted to amphibious pontoons

Headquarters: Taito-ku, Tokyo, Japan · Founded: 1970 · Company Type: Public Hydraulic Excavator & Super-Long-Front OEM (TSE: 6305)

Website: https://www.hitachicm.com/

Main Products: ZX130-5G (13.1t), ZX200-5G / ZX200-7 (20.1t), ZX210LC-7 Super Long Front, ZX240-5G, and ZX300LC-7 Upper & Long-Reach Platforms

Manufacturing Capabilities: TRIAS III three-pump hydraulic system and HIOS IV/V control paired with Isuzu 4HK1 and 6BG1T diesel engines (125 kW)

Certifications: ISO 9001 and ISO 14001 certified at Tsuchiura Works in Japan according to its website

Notable Work: Hitachi’s three-pump TRIAS hydraulic architecture prevents boom-up speed drop when swinging and feathering a 15-meter dredging arm from a floating hull. Isuzu 6BG1T mechanical/electronic engines on ZX200-5G export uppers are prized by Southeast Asian swamp contractors for simple field servicing.

Hitachi Construction Machinery Co., Ltd. is favored by dredging crews who need smooth multi-actuator control on long-reach booms. The three-pump TRIAS III hydraulic system on the ZX200-5G and ZX210LC-7 delivers precision grading while slewing over soft mud. Many wetland contractors pair a pre-owned Hitachi ZX210 hydraulic excavator upper body with new Malaysian or Chinese pontoons for reliable Isuzu serviceability. Buoyant pontoon undercarriages are supplied through partner fabricators rather than standard ZAXIS crawler lines.

16. Komatsu Ltd.: Best for Fleet owners converting high-hour-durability PC200-8M0 or PC210-10M0 upper structures onto amphibious pontoons with closed-center CLSS hydraulics

Headquarters: Minato-ku, Tokyo, Japan · Founded: 1921 · Company Type: Public Construction & Mining Equipment OEM (TSE: 6301)

Website: https://www.komatsu.com/

Main Products: PC130-8 (13t), PC200-8M0 (19.8t), PC210-10M0 / PC210LC-11 Super Long Front (22.1t), and PC300-8M0 Upper Platforms

Manufacturing Capabilities: In-house Komatsu SAA6D107E-1 six-cylinder engine (110 kW / 148 hp) and Closed-Center Load Sensing System (CLSS) hydraulics delivering 439 L/min

Certifications: ISO 9001 and ISO 14001 across global excavator manufacturing plants in Awazu, Osaka, and Changzhou according to its website

Notable Work: Komatsu CLSS hydraulics divide oil flow proportionally regardless of load pressure, preventing track-steer stall when turning wide pontoons in deep mud. The PC200-8M0 and PC210-10M0 upper structures share standardized center-joint swivel passages that simplify bolting onto aftermarket amphibious pontoons.

Komatsu Ltd. engineers its PC200-8M0 and PC210-10M0 excavators with an SAA6D107E-1 engine and Closed-Center Load Sensing System (CLSS) hydraulics. Delivering 439 L/min of oil flow, the CLSS main valve splits flow evenly so wide pontoons steer smoothly in sticky clay. Standardized swing-circle bolt patterns ensure direct mechanical compatibility with most aftermarket 20-ton pontoon frames. Komatsu supplies crawler uppers and super-long fronts rather than factory-sealed floating pontoons.

17. SANY Heavy Industry Co., Ltd.: Best for Contractors sourcing factory-built SANY SY215E-AM amphibious excavators or low-hour SY215C uppers for marsh conversion at competitive capital cost

Headquarters: Changsha, Hunan, China (Excavator base in Kunshan, Jiangsu) · Founded: 1989 · Company Type: Public Heavy Construction Machinery OEM (SSE: 600031)

Website: https://www.sanyglobal.com/

Main Products: SY215C / SY215E Amphibious Variant (21.5t base), SY225C Long Reach, SY245H, and SY75C / SY135C Upper Platforms

Manufacturing Capabilities: Isuzu 4HK1 (128 kW) or Cummins QSB6.7 engine paired with Kawasaki K3V112DT / K5V positive-flow hydraulic pumps (2 x 220 L/min) and AOCT control

Certifications: ISO 9001, ISO 14001, CE Marking, and WEF Lighthouse Factory certification at Kunshan excavator works according to its website

Notable Work: Twin 220 L/min Kawasaki positive-flow pumps on the SY215C deliver 440 L/min total hydraulic flow to drive dual-motor pontoon travel reducers. SANY produces both special-order amphibious excavators and high-volume SY215C upper structures used by Chinese and US pontoon builders.

SANY Heavy Industry Co., Ltd. offers both factory SY215E amphibious variants and the high-volume SY215C 21.5-ton upper platform. Powered by an Isuzu 4HK1 or Cummins QSB6.7 engine, twin 220 L/min Kawasaki pumps supply 440 L/min to drive triple-strand pontoon chains. High pump flow and low initial cost make SANY a popular choice for canal clearing fleets. Outside Asia and Africa, dealer stock for SANY-specific pontoon chains and sprockets is thinner than for standard crawler parts.

18. XCMG Construction Machinery Co., Ltd.: Best for State waterway, flood-relief, and municipal dredging fleets ordering factory-integrated XE215S / XE225S amphibious excavators

Headquarters: Xuzhou, Jiangsu, China · Founded: 1943 (XCMG Group restructured 1989) · Company Type: Public Heavy Machinery & Special-Purpose Excavator OEM (SZSE: 000425)

Website: https://www.xcmg.com/

Main Products: XE215S / XE225S Amphibious Excavator (~25.5t operating weight with pontoons), XE150S Swamp Excavator, XE215C, and XE245DK

Manufacturing Capabilities: Isuzu BB-6BG1TRP (106.5 kW) or Cummins QSB6.7 six-cylinder engine, Kawasaki twin axial-piston pumps (2 x 214 L/min), and sealed box-section pontoons

Certifications: ISO 9001, ISO 14001, ISO 45001, and CE certification at Xuzhou Excavator Machinery Co., Ltd. according to its website

Notable Work: XCMG manufactures the factory-built XE215S amphibious excavator under a single OEM nameplate, uniting upper structure and pontoon warranty coverage. The six-cylinder Isuzu 6BG1 turbo engine on XE215C/S export platforms offers high low-end lugging torque for continuous swamp tracking.

XCMG Construction Machinery Co., Ltd. manufactures factory-integrated XE215S and XE225S amphibious excavators at its Xuzhou base. Buying a complete XE215S gives municipal flood-control bureaus a single OEM nameplate covering the Isuzu engine, Kawasaki pumps, and sealed pontoons. Operating weight reaches 25.5 metric tons with reinforced box-section pontoons and long-reach dredging equipment. Export sub-models across XE215S and XE215C use varying Isuzu, Cummins, or Weichai engines that require serial-plate checks before ordering parts.

19. LiShide Construction Machinery Co., Ltd.: Best for Budget-sensitive dredging contractors wanting a dedicated Chinese factory-built SC210.8 / SC220SD amphibious swamp excavator

Headquarters: Linyi, Shandong, China · Founded: 2004 · Company Type: Chinese Hydraulic & Amphibious Excavator OEM

Website: https://www.lishide.com/

Main Products: SC210.8 / SC220.8SD Amphibious Swamp Excavator, SC240.8 Long Reach, and SC130 / SC210 Crawler Excavators

Manufacturing Capabilities: Cummins B5.9 engine (112 to 133 kW), Kawasaki K3V112DT main pump, KYB control valve, and three-chain sealed amphibious pontoons

Certifications: ISO 9001 quality management system and CE certification at Linyi manufacturing base according to its website

Notable Work: LiShide was one of the earliest Chinese excavator factories to serialize a factory-catalog SC210.8 amphibious excavator for domestic river-basin bureaus. Using off-the-shelf Cummins B5.9 engines and Kawasaki K3V112DT pumps keeps overhaul parts accessible anywhere in the world.

LiShide Construction Machinery Co., Ltd. in Linyi, Shandong was among the first Chinese OEMs to catalog dedicated SC210.8 and SC220.8SD swamp excavators. Pairing a mechanical Cummins B5.9 engine with a Kawasaki K3V112DT pump and KYB valve keeps maintenance simple in remote marshes. Three-chain sealed pontoons provide low ground pressure for coastal fishpond and canal excavation. LiShide has a smaller overseas dealer network than SANY or XCMG, so buyers rely on factory parts dispatch.

20. Zoomlion Heavy Industry Science & Technology Co., Ltd.: Best for Civil and river-conservancy contractors sourcing ZE215E / ZE215G upper platforms or special wetland configurations from an automated smart factory

Headquarters: Changsha, Hunan, China (Smart Industrial City) · Founded: 1992 · Company Type: Dual-Listed Heavy Equipment OEM (SZSE: 000157 / HKEX: 1157)

Website: https://en.zoomlion.com/

Main Products: ZE135E-10 (13.8t), ZE215E / ZE215G (21.5t base for wetland/long-reach conversions), ZE245E (24.5t), and ZE75E

Manufacturing Capabilities: Cummins B5.9 / QSB6.7 and Isuzu turbo diesel engines (112 to 129 kW) matched with Kawasaki main pumps and E-10 electronic positive-flow control

Certifications: ISO 9001, ISO 14001, ISO 45001, and CE Marking according to its website

Notable Work: Zoomlion’s Changsha Smart Industrial City uses automated robotic welding and ultrasonic weld inspection for heavy excavator upper frames and long-reach booms. Enlarged tropical radiators and high-capacity hydraulic oil coolers on the ZE215E/G prevent overheating during continuous high-load swamp tracking.

Zoomlion Heavy Industry Science & Technology Co., Ltd. builds its ZE215E and ZE215G excavators inside its automated Changsha Smart Industrial City. Robotic boom welding and enlarged tropical oil coolers help the 21.5-ton ZE215E handle continuous travel motor loads in hot swamps. Contractors can order wetland configurations or mount a ZE215E upper body onto modular spud pontoons. Zoomlion’s overseas service network focuses primarily on cranes and concrete machinery, with amphibious units built on project order.

What Buoyancy Reserve, Water Depth, Spud Piles, and Hydraulic Flow Should You Specify?

Ordering an amphibious excavator by nominal tonnage alone causes deep-water tipping and drive chain failure. Water operations across terrestrial and aquatic environments follow ISO 6165:2022 earth-moving machinery standards and Archimedes’ Principle of displacement. When pontoons submerge in shallow waters or saturated silt, hull displacement must support both machine dead weight and loaded bucket tipping torque to maintain stability on soft ground.

Use The 4-Class Buoyancy & Carrier Tonnage Matching Matrix to align the carrier size, pontoon displacement volume, ground pressure and safe water levels:

To prevent hull failure and hydraulic overheating during wetland restoration, use The 6-Point Pontoon Hull & Drive Chain Engineering Audit:

• In a 20-ton buoyancy reserve calculation, mount a Cat 320 or Komatsu PC200-8 upper structure (11,500 kg without tracks) onto twin pontoons (11,200 kg) with a 15-meter front (2,300 kg). Total wet mass equals 25,000 kg, which displaces 25.0 m³ of freshwater. Two pontoons measuring 9.6 m by 1.65 m by 1.05 m provide 33.26 m³ of sealed volume. That 8.26 m³ margin delivers +33.0% reserve buoyancy above required displacement (8.26 / 25.0 m³), or 24.8% unsubmerged freeboard hull volume (8.26 / 33.26 m³). Across 24.96 m² of shoe contact area, static ground pressure drops to 9.82 kPa (1.42 psi).
• Once water exceeds 1.5 to 1.8 meters, main pontoons float off the bed and a 90-degree side swing shifts the center of gravity. When the boom swings to a 90 degree side position, the center of gravity shifts as well. Per U.S. Army Corps of Engineers (USACE) dredging guidance, floating excavators in deeper water or active water flow must bolt on side pontoons and drive hydraulic spud piles.
• Thin mild steel is easy to puncture by tree roots, rocks, riprap, and oyster beds. Specify minimum 8 mm side plates and 10 to 12 mm bottom plates in ASTM A588 Corten steel, CCSB marine ship plate, or Q355B/HG785 steel. Because submerged weathering steel cannot form an oxide patina in brackish mud, hulls also require marine epoxy paint and sacrificial zinc anodes.
• Due to the free-surface effect, water sloshing in an undivided hull increases the potential for dangerous free-surface tipping. Every pontoon must contain at least three independent watertight compartments with separate inspection manholes.
• For attachment weight derating on 15-meter long-reach booms, standard 20-ton pontoons balance a 0.40 to 0.55 m³ bucket at 13 to 15 meters reach. When mounting heavier heavy-duty excavator buckets and hydraulic attachments like slurry pumps or vibratory pile drivers, shorten the boom to 10–12 meters so the bow stays level.

How to Choose an Amphibious Excavator Manufacturer: Verification Checklist & Donor Conversion Math

Physical inspection protects your capital from weld leaks and drive-chain downtime, whether you buy a turnkey unit or convert a crawler. Run every supplier through this seven-point factory verification checklist before releasing final payment:

To match your project budget and schedule to the right sourcing path, apply The 3-Route Procurement & Donor Upper-Structure Matching Rule below:

Is It Better to Buy a Complete Factory Amphibious Excavator or Pair a New Pontoon Undercarriage With an Inspected Used 20-Ton Donor Machine?

Buying a complete factory amphibious excavator fits government flood-control agencies and North American or European contractors that need a single-invoice warranty and Tier 4 Final emissions compliance. Private dredging contractors in Southeast Asia, Africa, Latin America, and the Middle East often take a different path. Pairing a new sealed pontoon undercarriage ($35,000 to $65,000) with a pre-tested 20-ton donor upper structure ($28,000 to $75,000 FOB China) cuts capital cost by 45% to 60%. Rebuilding a proven 20-ton upper body also provides a sustainable approach to fleet expansion in remote basins. Before unbolting the crawler frame, always verify pump pressure and swing bearing play using our pre-shipment used excavator hydraulic and structural inspection checklist. Our shop team can also machine the turret adapter ring and pressure-test auxiliary spud lines before container loading.

Frequently Asked Questions About Amphibious Excavator Manufacturers

How deep of water can a 20-ton amphibious excavator safely work in?

A standard 20-ton amphibious excavator works safely on its main pontoons in water and soft silt up to 1.5 to 1.8 meters (5 to 6 feet) deep. Crews must bolt on supplementary side pontoons and drive 6 to 9 meter hydraulic spud piles for the excavator to float and dig stably in 3.5 to 4.5 meters of water.

How long do amphibious excavator pontoon chains and track cleats last?

Heavy-duty triple-strand pontoon track chains have an operating life of 2,500 to 4,000 hours in freshwater clay and peat marshes. Pin, bushing and sprocket replacement is required at that time. In abrasive coastal sand or brackish saltwater marshes, chain life drops to 1,500 to 2,200 hours unless operators specify sealed oil-bath bearings, sacrificial zinc anodes, daily washdowns, and weekly tension adjustments.

Can a 20-ton amphibious excavator be shipped inside standard 40-foot containers?

Yes, modular 20-ton amphibious excavators ship inside two 40-foot High Cube (40HQ) containers once the left and right pontoons are unbolted from the crossbeams and the upper structure is separated from the slew ring. Fixed-frame or hydraulic telescopic single-piece undercarriages wider than 2.35 meters per pontoon require a 40-foot Flat Rack (40FR) or Roll-on/Roll-off vessel for international ocean freight.

Which used excavator models are most popular as donor upper structures for amphibious pontoons?

The Caterpillar 320D and 320, Komatsu PC200-8, Hitachi ZX200-5G, and SANY SY215C lead all donor platforms because their slew rings and 400+ L/min twin pumps match 20-ton pontoons.

What is the difference between an amphibious excavator builder and a used excavator supplier?

Specialist builders weld sealed pontoon undercarriages, whereas Hefei Liehuang Machinery inspects and exports pre-owned Caterpillar, Komatsu, and Hitachi crawler excavators for donor conversion or fleet support.

What steel grade and coating should buyers specify for saltwater or coastal marsh dredging?

For coastal marsh and mangrove dredging, buyers should request marine grade CCS-A or ABS Grade A hull steel or ASTM A588 Corten steel with a minimum of 8 mm side plates and 10 to 12 mm bottom wear plates. Inside compartments require a rust inhibiting primer and an air-tightness test of 15 to 20 kPa, and the outer hulls require a two component marine epoxy paint of a minimum of 250 microns with bolt-on sacrificial zinc anodes to prevent galvanic pitting.

Sourcing Inspected 10–30 Ton Donor & Fleet Excavators From Hefei Liehuang Machinery

To build a profitable wetland dredging or canal-clearing fleet, a durable pontoon undercarriage should be paired with a hydraulically sound upper structure. Whether you bolt standalone pontoons onto a 20-ton donor machine or run conventional crawlers along firm levee banks, the hydraulic health of the upper structure determines your uptime in inaccessible habitats.

At Hefei Liehuang Machinery Co., Ltd., we stock a ready-to-ship yard of inspected Caterpillar, Hitachi, Komatsu, Kobelco, Volvo, and SANY excavators in Hefei, China. For buyers planning an amphibious pontoon conversion, our technicians test main hydraulic pump relief pressure, center swivel-joint seal integrity, swing bearing clearance, and engine compression before export. We also coordinate 40HQ container dismantling to cut ocean freight costs. To review live machine serial numbers, hydraulic pressure videos, and CIF port quotes for your next wetland project, request a donor excavator inspection video and FOB shipping quote from our engineering team today.

References & Sources

1. International Organization for Standardization (ISO). ISO 6165:2022 Earth-moving machinery, Basic types, Identification and vocabulary.
2. United States Army Corps of Engineers (USACE). USACE Civil Works Dredging and Navigation Engineering Program.
3. Wilson Marsh Equipment Co. Amphibious Excavators, Telescopic Pontoons, and Marsh Cargo Buggies Technical Specifications.
4. Bell Dredging Pumps B.V. Amphibious Excavators and Tracked Pontoon Undercarriages Product Documentation.
5. Pile Buck International. Amphibious Excavators: Engineering, Spud Stabilization, and Waterfront Pile Driving Applications.