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Auxiliary Hydraulic Kits & Diesel-to-Hybrid Conversion Systems for Excavators

NG Attachments designs and supplies advanced hydraulic and electro-hydraulic solutions for excavators, compact excavators, backhoe loaders, wheel loaders and special-purpose construction machines.

Our engineering scope includes auxiliary hydraulic circuits, double-acting hydraulic kits, rotation line kits, case drain lines, quick coupler hydraulic systems, joystick-controlled attachment circuits, electric hydraulic power packs and diesel-to-hybrid conversion systems for low-emission working environments.

Complete Hydraulic and Hybrid Engineering for Modern Attachments

Modern excavator attachments require more than a simple breaker line. Demolition shears, sorting grabs, orange peel grapples, timber grabs, augers, hydraulic quick couplers, rotary screening buckets and brush cutters often need multiple hydraulic functions such as open-close, rotation, pressure control, low-flow circuits and safe tank return.NG Attachments provides machine-specific hydraulic kit solutions based on the carrier model, hydraulic pump capacity, valve configuration, operating pressure, required flow rate, attachment function and site conditions. For compact and mini excavators, these hydraulic systems can also be integrated with electric power units or hybrid conversion packages for indoor, urban and low-emission applications.

Main Solutions

Auxiliary hydraulic circuit kits for excavators and compact machines
Double-acting hydraulic kits for open-close attachment functions
Hydraulic rotation line kits for shears, grapples and rotating tools
Case drain lines for hydraulic motors and low-pressure return circuits
Hydraulic quick coupler circuits for safe locking and unlocking
Joystick and proportional control kits for precise operator control
Electric hydraulic power packs for attachment operation
Diesel-to-hybrid conversion kits for compact excavators and special machines
400V cable-powered electric operation systems for emission-sensitive sites
Battery-electric retrofit options for project-specific machine conversion

Auxiliary Hydraulic Kit for Excavators

An excavator auxiliary hydraulic kit is designed to provide additional hydraulic functions for attachments that cannot be operated by the standard bucket or breaker circuit alone. Depending on the machine and attachment, the system may include extra hydraulic lines, valve blocks, pressure relief valves, quick couplers, pilot control components, electrical wiring and cab-mounted controls.NG Attachments designs auxiliary hydraulic kits for single-acting, double-acting and multi-function attachment operation. These systems are used for demolition, recycling, forestry, material handling, construction, quarrying, municipal maintenance and industrial applications.

Double-Acting Hydraulic Circuit

A double-acting hydraulic circuit allows oil flow in two controlled directions. This is essential for attachments that require open-close, clamp-release, tilt, rotate or reverse movement. A double-acting circuit is commonly required for hydraulic grabs, demolition shears, sorting grapples, orange peel grabs, log grapples, hydraulic thumbs and special attachment systems.The correct hydraulic flow, pressure setting, hose diameter, valve configuration and operator control system must be selected according to the attachment specification. Incorrect hydraulic sizing may cause overheating, slow operation, unstable movement or premature component failure.

AUX 2, AUX 3 and AUX 4 Hydraulic Circuit Logic

Circuit Type	Main Function	Typical Attachments	Technical Note
AUX 2	Auxiliary hydraulic supply on the boom and arm	Breaker, auger, brush cutter, hydraulic bucket, compact tools	Flow and pressure must match the attachment requirement.
AUX 3	Open-close or coupler control circuit	Hydraulic quick coupler, grab, grapple, clamp, thumb	Can be designed as single-acting or double-acting depending on the application.
AUX 4	Rotation, tilt or additional attachment function	Demolition shear, rotating grapple, timber grab, powertilt, rotating coupler	Low-flow rotation circuits require controlled pressure and safe return routing.

Machine Brand and Model-Based Hydraulic Kit Applications

NG Attachments does not treat hydraulic kits as universal parts. Each system must be engineered according to the carrier machine, serial number, available hydraulic functions, attachment type and operating environment.

Machine Group	Brand	Example Models	Hydraulic Solutions	Suitable Attachments
Excavator	JCB	JCB 131X, 140X, 150X, 220X	Double-acting conversion kit, low-flow rotation line, joystick-controlled open-close circuit	Grapple, shear, log grab, quick coupler, rotating attachments
Excavator	Hitachi	ZX210, ZX225-5, ZX300, ZX350, ZX490	Low-flow rotation circuit, auxiliary hydraulic circuit, valve block and cab control	Demolition shear, quick coupler, timber grab, scrap grapple
Excavator	Komatsu	PC200, PC210, PC290, PC300, PC350, PC400, PC450	Breaker line, double-acting shear circuit, rotation line, case drain line	Breaker, auger, shear, rotary screening bucket, motor-driven attachments
Excavator	Caterpillar CAT	CAT 320, 323, 330, 336, 340, 349, 350	Attachment line, quick coupler hydraulic circuit, shear rotation line, joystick button kit	Quick coupler, demolition shear, pipe handler, grapple, log grab
Excavator	Volvo	EC220, EC300, EC380, EC480, EC750	High-flow attachment line, rotation circuit, case drain and pressure relief system	Demolition shear, high reach demolition tools, heavy-duty grapples
Excavator	Doosan / Develon	DX225, DX300, DX360, DX420, DX480	Double-acting auxiliary circuit, rotation line, cab control and quick coupler line	Grapple, log grab, quick coupler, hydraulic shear
Excavator	Hyundai	HX220, HX300, HX380, HX480	Breaker line, double-acting line, hydraulic motor return line, case drain	Auger, brush cutter, rotary screening bucket, shear, grapple
Excavator	Hidromek	HMK 220 LC, HMK 300 LC, HMK 390 LC	Auxiliary hydraulic circuit, breaker line, shear line, motor-driven return circuit	Rotary screening bucket, breaker, auger, shear, log grab
Wheel Loader	Komatsu	WA320, WA380, WA470, WA500	Loader attachment line, 6/2 selector valve, bucket cylinder oil diversion system	Big bag filling bucket, pipe and pole fork, snow broom, special loader attachments
Backhoe Loader	JCB / Çukurova / Hidromek	JCB 3CX, JCB 4CX, Çukurova 980-Z, Hidromek HMK 102B	Front or rear double-acting hydraulic output, selector valve and cab control	Log grab, hydraulic bucket, snow attachment, special clamping systems

Note: Brand and model names are used only to explain technical compatibility areas. Each hydraulic kit must be checked according to the exact machine serial number, hydraulic configuration, operating pressure, flow rate and attachment requirement.

Diesel-to-Hybrid Conversion Kit for Compact Excavators

In emission-sensitive working environments, compact excavators and mini excavators may require an electric or hybrid operating mode. A diesel-to-hybrid conversion kit can add an electric motor, electric hydraulic power unit, control panel and power supply system to support machine or attachment operation with reduced emissions.

Depending on the project, the existing diesel engine can be kept for outdoor operation while an electric drive or electric hydraulic power pack is used for indoor, urban, tunnel, renovation or factory applications.

What Is a Diesel-Electric Hybrid Excavator Conversion?

A diesel-electric hybrid excavator conversion is an engineering solution that enables a machine to operate with an additional electric power source. This can be achieved by adding an electric motor beside the existing diesel engine, integrating an electric hydraulic power pack, or replacing the diesel engine with a battery-electric drive system in project-specific retrofit applications.The main purpose is to reduce exhaust emissions, noise and diesel engine operating hours while keeping the machine useful in different jobsite conditions. In electric mode, the machine can be used in indoor demolition, building renovation, factory maintenance, tunnels, underground sites and low-emission urban projects.

Main Components of a Hybrid Conversion Kit

Component	Function	Technical Explanation
Electric Motor	Drives the hydraulic pump or electric power unit.	Selected according to machine tonnage, required hydraulic flow, pressure and duty cycle.
Electric Hydraulic Power Pack	Provides pressurized oil for machine or attachment functions.	May include pump, tank, filter, cooler, relief valve, manifold and hydraulic fittings.
Control Panel	Controls motor, drive unit, safety systems and operating mode.	Can include contactors, fuses, inverter, emergency stop, sensors and warning indicators.
400V Cable Power Supply	Allows cable-powered electric operation on site.	Cable, plug, reel and safety connection system are selected according to site infrastructure.
Battery Pack	Allows cable-free electric operation.	Optional project-specific solution; capacity depends on required working time and machine power.
Hydraulic Integration Lines	Connect the electric power unit to the machine hydraulic system.	Pump outlet, tank return, case drain, auxiliary lines and pressure relief points must be checked.
Cab Control System	Allows the operator to control electric mode and attachment functions.	Can include joystick buttons, selector switches, indicators, control display or proportional controls.

Hybrid and Electric Retrofit Applications by Machine Type

Machine Group	Example Brands and Models	Conversion Type	Typical Application
Mini Excavator	Takeuchi TB210, TB216, Kubota KX019, Kubota U27, JCB 19C, Bobcat E19	Electric motor assisted hybrid kit or battery-electric retrofit	Indoor demolition, renovation, factory work, low-noise operation
Compact Excavator	Takeuchi TB216, TB230, Kubota KX027, JCB 35Z, CAT 303, Volvo ECR25	400V cable-powered electric hydraulic power unit	Tunnel, basement, hospital, school, city-center and emission-sensitive sites
Midi Excavator	Komatsu PC138, CAT 308, Volvo ECR88, Hitachi ZX85, Doosan DX85	Electric hydraulic power pack for attachment operation	Special attachment drive, low-emission operation, industrial project sites
Backhoe Loader and Loader	JCB 3CX, JCB 4CX, Çukurova 980-Z, CAT 432, Hidromek HMK 102B	Electric-assisted hydraulic attachment power unit	Snow broom, hydraulic bucket, log grab, factory and municipal work

Note: Diesel-to-hybrid and electric retrofit systems require project-specific engineering. Machine stability, hydraulic demand, electric power supply, battery capacity, cooling, safety circuit and service access must be evaluated before production.

Diesel-Electric Hybrid vs Battery-Electric Retrofit

System Type	Operating Method	Main Advantage	Engineering Consideration
Diesel-Electric Hybrid Kit	Diesel engine remains; electric motor or power unit is added.	Flexible outdoor diesel mode and indoor electric mode	Hydraulic integration and safety controls must be engineered correctly.
400V Cable-Powered Electric System	Machine or hydraulic unit operates with site electricity.	Long operating time without battery charging downtime	Cable management and site electrical infrastructure are required.
Battery-Electric Retrofit	Diesel engine is removed or replaced by a battery pack and electric drive.	Cable-free zero-exhaust operation	Battery capacity, weight distribution, runtime and charging must be calculated.

Integration with Hydraulic Attachments

A hybrid or electric power unit becomes even more valuable when it is designed together with the attachment hydraulic system. Hydraulic breakers, demolition shears, scrap grapples, timber grabs, augers, rotary screening buckets, brush cutters and quick couplers require correct hydraulic flow, pressure control, return routing and operator command.NG Attachments can evaluate the complete package: carrier machine, auxiliary hydraulic circuit, double-acting lines, rotation circuit, case drain, electric hydraulic power pack and attachment interface. This approach helps improve performance, safety and serviceability in demanding jobsite conditions.

Technical Criteria Checked by NG Attachments

Hydraulic Flow

Flow rate is checked according to the attachment motor, cylinder speed and machine pump capacity.

Operating Pressure

Pressure limits, relief settings and attachment manufacturer requirements are evaluated together.

Return and Case Drain

Hydraulic motors require safe low-pressure return and correct case drain routing to protect seals.

Control System

Joystick buttons, proportional controls, selector valves and electric commands are selected by function.

Electric Power

For hybrid systems, voltage, motor power, battery capacity, cable supply and duty cycle are reviewed.

Machine Safety

Emergency stop, pressure protection, hose routing, guards and service accessibility are considered.

Information Required for Quotation

To prepare the correct technical offer for an auxiliary hydraulic kit, hybrid conversion kit or electric hydraulic power pack, please provide the following information:

Machine brand, model and serial number
Operating weight and engine power
Existing hydraulic functions and available auxiliary lines
Hydraulic pump flow rate and maximum pressure
Attachment type and required functions
Required circuits: open-close, rotation, breaker, quick coupler, case drain
Preferred operating mode: diesel, cable-electric, battery-electric or hybrid
Site voltage and electrical infrastructure if electric operation is required
Daily target working time and duty cycle
Photos of the boom, arm, valve area, cab controls and attachment connection points

Frequently Asked Questions

Can an auxiliary hydraulic kit be installed on every excavator?

In many cases, yes. However, the solution depends on the machine valve block, pump capacity, existing breaker line, electronic control system and the hydraulic requirement of the attachment.

What hydraulic lines are required for a demolition shear?

A demolition shear usually requires an open-close circuit, a rotation line and proper pressure protection. Some models may also require a case drain line depending on the hydraulic motor configuration.

Why is a case drain line important?

A case drain line protects hydraulic motors by allowing internal leakage oil to return safely to the tank. Without correct case drain routing, motor seals may be damaged by excessive internal pressure.

Can a diesel excavator be converted to hybrid operation?

Yes, depending on the machine and project requirements. Some systems keep the diesel engine and add an electric motor or electric hydraulic power pack. Other retrofit concepts may replace the diesel engine with a battery-electric system.

Is a 400V cable-powered excavator suitable for indoor work?

Cable-powered electric systems can be suitable for indoor, tunnel, factory and low-emission projects when the site has the correct electrical infrastructure and safe cable management.

Build the Right Hydraulic and Hybrid System for Your Machine

Whether you need an auxiliary hydraulic circuit, double-acting attachment kit, rotation line, case drain system, electric hydraulic power pack or diesel-to-hybrid conversion solution, NG Attachments can support your project with machine-specific engineering.

Request a Hydraulic or Hybrid Kit Quotation

Excavator Auxiliary Hydraulic Kit & Hybrid Conversion System | NG Attachments