The Hyundai HX135G is a 13.5-ton class crawler excavator designed for landscaping, municipal maintenance, general earthmoving and truck-loading duties. It pairs a Weichai WP4.1 diesel engine (74 kW, 420 N·m) with an optimized hydraulic system for low fuel consumption, carries a 0.56 m³ bucket on a 4.6 m boom and 2.5 m arm, and uses a urea-free DOC+DPF aftertreatment system that removes more than 80% of particulate matter from the exhaust.

Built around the design philosophy of "low consumption, high efficiency, long durability," the HX135G is positioned as the fuel-saving performer of its size class for small- and medium-scale construction projects. This guide covers its dual engine options, reinforced undercarriage, cooling and filtration design, 20-ton-class cab, and the after-sales support available through Tianheng Construction Machinery.

Key Takeaways: The HX135G at a Glance

• Dual Power Options: Standard Weichai WP4.1 (74 kW, 420 N·m) or optional Yuchai YCF36125 (92 kW, 480 N·m) for heavier duty cycles.

• Urea-Free Emissions: DOC+DPF aftertreatment with automatic regeneration — no DEF dosing, over 80% PM reduction, China Stage IV compliant.

• Productive Front End: 0.56 m³ bucket on a 4.6 m boom and 2.5 m arm delivers a full load per pass in truck-loading and earthmoving work.

• Durable Structure: Cast swing bearing rated at 40 kN·m plus extended tracks (1,990 mm gauge, 3,010 mm ground contact) for impact resistance and stability.

• Harsh-Site Ready: Large parallel cooling package and standard high-capacity Donaldson air filter for hot, dusty conditions.

• Upper-Segment Cab: 20-ton-class wide-body cab with one-key start, LCD monitor, Bluetooth and suspension seat.

• Tianheng Support: Backed by a $5 million genuine parts inventory and 50 strategically located global branches.

Quick Specifications: Hyundai HX135G

Powertrain: Two Engine Options for Different Duty Cycles

Weichai WP4.1: the standard, cost-optimized choice

At the heart of the standard Hyundai HX135G lies the Weichai WP4.1 four-cylinder diesel engine, rated at 74 kW at 2,200 rpm with 420 N·m of torque available between 1,400 and 1,600 rpm. Long proven in the Chinese market, it offers broad parts availability and low repair cost — the rational choice for cost-sensitive fleets and rental operators.

Yuchai YCF36125: optional power for heavy duty

Customers with continuous loading or hard-digging duties can specify the optional Yuchai YCF36125 engine, which raises rated output to 92 kW and peak torque to 480 N·m (1,300–1,600 rpm). The wider torque plateau keeps the machine productive in tough material without downshifting or lugging.

Urea-free DOC+DPF aftertreatment

Both engine versions use DOC+DPF aftertreatment technology with automatic DPF regeneration. No diesel exhaust fluid (DEF/urea) dosing is required, and more than 80% of particulate matter is removed from the exhaust — meeting China Stage IV limits while cutting operating cost and complexity. Export-market configurations may differ, so confirm the compliance package for your destination country with our sales team.

Matched hydraulics: where the fuel savings come from

Fuel economy is further supported by matched engine–hydraulic tuning. The hydraulic system is calibrated to the engine's torque curve so that flow and pressure are delivered without overspeeding the engine — which is where much of the machine's real-world fuel saving originates during mixed digging, swinging and loading cycles.

Engine options compared

Reinforced Front Attachment and Undercarriage

Bigger bucket, fewer passes

The upgraded 0.56 m³ bucket, combined with a 4.6 m boom and 2.5 m arm, gives the HX135G a full load per pass. Key joints of the front attachment, upper structure and swing support use strengthened designs, improving long-term durability under repetitive digging and swinging loads.

Cast swing bearing and extended tracks

A cast-type swing bearing rated at 40 kN·m of swing torque provides strong shock resistance and a longer service life — critical when running impact attachments. The extended undercarriage, with a 1,990 mm track gauge and 3,010 mm ground contact length, significantly improves whole-machine stability when lifting, digging over the side or working on slopes.

Attachment versatility

The reinforced platform stably supports hydraulic breakers, wood grapples, thumbs and other attachments, allowing one machine to cover demolition, forestry, handling and general excavation tasks across a project lifecycle.

Cooling and Filtration for Hot, Dusty Jobsites

A large parallel-type cooling package with generous cooling area suppresses hydraulic oil temperature rise in high-ambient conditions, while a standard high-capacity Donaldson air filter extends service intervals in dusty environments — keeping both the engine and hydraulic system reliable over the long term.

• Parallel cooling layout: Sufficient cooling area controls engine and oil temperatures during continuous summer operation.

• Donaldson air filter: Larger dust-holding capacity lengthens maintenance cycles — valuable in demolition, quarry-adjacent and unpaved-road work.

• Result: Stable performance in the hot, dusty conditions typical of municipal and earthmoving contracts.

20-Ton-Class Cab Comfort in a 13-Ton Machine

Centralized LCD monitoring and connectivity

The HX135G adopts a wide-body cab normally associated with 20-ton class machines. One-key start, radio and a Bluetooth entertainment system are standard, while the large LCD monitor integrates coolant temperature, hydraulic oil temperature, engine rpm, air-conditioning and Bluetooth controls — putting all key parameters in one centralized view.

Suspension seat, space and storage

A suspension seat and generous operator space reduce fatigue over long shifts, and an added rear storage compartment behind the seat holds tools and personal items — a practical touch for crews that spend full days in the machine.

Safety and Serviceability: Protecting People and Uptime

External emergency stop

An emergency stop switch mounted under the seat allows power to be cut in an emergency without entering the cab, protecting both personnel and machine. It is a simple feature that fleet safety officers consistently appreciate.

Fast daily checks and two-stage filtration

A large onboard toolbox stores the grease gun and hand tools, while a two-stage filtration protection design extends engine life in dirty conditions. Convenient inspection points and quick filter-element replacement keep daily checks fast, directly reducing downtime risk and improving machine utilization.

Best-Fit Applications for the HX135G

• Landscaping and greening: Balanced size and stability for park, roadside and green-belt projects.

• Municipal maintenance: Road repair, utility trenching and street-side tasks where stability and attachment versatility matter.

• General earthworks: The 0.56 m³ bucket and reinforced front deliver productive digging and site preparation.

• Truck loading: Boom and arm reach matched to standard highway trucks for fast, stable loading cycles.

• Attachment work: Breakers, wood grapples and thumbs for demolition, forestry and material handling.

The Tianheng Advantage: Parts, Service and Export Expertise

Purchasing the machine is only half the equation; aftermarket support dictates your daily profitability. As a Diamond-level Dealer with 25 years of specialized Hyundai expertise, Tianheng Construction Machinery eliminates the typical pain points of equipment ownership for export customers.

Strategic parts availability

Downtime is the enemy. Tianheng maintains a $5 million USD inventory of genuine Hyundai components, with 50 strategically located direct-operated branches guaranteeing swift, expedited distribution. Whether you need filters, hydraulic components or undercarriage parts for your HX135G, the logistics network gets your machine back to work in record time.

Export-ready delivery

Every exported unit undergoes pre-delivery inspection and export-standard packaging. Our team handles configuration confirmation (standard Weichai or optional Yuchai engine, bucket and attachment list), FOB/CIF quotation and shipping documentation for your destination port.

Conclusion and Next Steps

The Hyundai HX135G proves that a 13-ton machine can deliver upper-segment comfort, durability and emission performance without upper-segment operating cost. With its urea-free DOC+DPF system, 0.56 m³ bucket, cast 40 kN·m swing bearing and 20-ton-class cab, it is a compelling choice for contractors in landscaping, municipal and earthmoving segments — especially where fuel cost and uptime drive the budget. For broader budget planning, see our complete excavator pricing guide.

Ready to price the HX135G for your market? Send us your target configuration and destination port — our team replies with the specification sheet, quotation and delivery time.

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FAQ

What class of excavator is the Hyundai HX135G?

The HX135G is a 13.5-ton class crawler (mid-size) excavator, positioned between mini excavators and 20-ton machines, and fitted with a 20-ton-class wide-body cab for upper-segment operator comfort.

What engine does the Hyundai HX135G use?

Standard: Weichai WP4.1 four-cylinder diesel, 74 kW at 2,200 rpm and 420 N·m at 1,400–1,600 rpm. Optional: Yuchai YCF36125, rated at 92 kW with 480 N·m at 1,300–1,600 rpm for heavier duty cycles.

Does the HX135G require DEF (urea)?

No. It uses a DOC+DPF aftertreatment system with automatic DPF regeneration and no urea dosing, while removing more than 80% of particulate matter from the exhaust.

What are the bucket and digging configuration sizes?

The standard bucket capacity is 0.56 m³, mounted on a 4.6 m boom and 2.5 m arm — a configuration matched to truck loading and general earthmoving in the 13-ton class.

How fuel-efficient is the HX135G?

Fuel consumption depends on duty cycle. The machine's economy comes from matched engine–hydraulic tuning and strong low-rpm torque (420 N·m from 1,400 rpm), which avoids engine overspeed during mixed work. Contact Tianheng for field consumption data from comparable applications.

Which attachments can the HX135G carry?

The reinforced front attachment and 40 kN·m cast swing bearing support hydraulic breakers, wood grapples, thumbs and similar attachments for demolition, forestry and handling work.

Is the HX135G suitable for hot and dusty sites?

Yes. A large parallel cooling package controls oil temperature in high ambient heat, and the standard high-capacity Donaldson air filter extends service intervals in dusty conditions.

What emission standard does the HX135G meet?

The standard configuration meets China Stage IV. Export-market configurations may differ, so confirm the compliance package for your destination market with our sales team before ordering.

Where can I buy the HX135G and get parts and service?

Tianheng Construction Machinery is an authorized Hyundai dealer supplying export markets, backed by a $5 million genuine parts inventory and 50 direct-operated branches. Contact us for quotation, shipping and after-sales arrangements.