3 kW Three-Phase Double-Acting Hydraulic Power Unit, 380 V, 30 L Tank

Description

3 kW electric motor · 380 V three-phase supply · 700 bar maximum operating pressure · 30 L oil tank · Double-acting hydraulic circuit

Industrial hydraulic power for demanding applications and repeated work cycles. The CraftOil 3 kW three-phase double-acting hydraulic power unit is designed for industrial workshops, manufacturing facilities and service centres that require reliable high-pressure hydraulic power for repeated operations.

The unit combines a two-stage hydraulic pump, a 30-litre oil reservoir, remote control and a double-acting hydraulic circuit. It delivers a specified flow rate of 14 L/min at the first stage and 2.8 L/min at the high-pressure stage, with a maximum operating pressure of 70 MPa (700 bar).

This version is designed for a 380 V three-phase electrical supply. Compared with the corresponding 220 V single-phase version, the hydraulic specifications are the same, while the electrical connection and motor configuration differ.

If your facility already has a suitable three-phase supply, this model is worth considering for frequent hydraulic operations where higher flow and a suitable industrial electrical installation are important.

CraftOil provides equipment selection assistance, technical support and spare-parts service in Ukraine.

Key Benefits

• 3 kW electric motor: designed for demanding applications and frequent work cycles.

• 380 V three-phase supply: suitable for facilities equipped with a compatible three-phase electrical connection.

• Up to 700 bar operating pressure: for compatible hydraulic equipment rated for the required pressure.

• Two-stage pump: combines higher flow at low pressure with lower flow at high pressure.

• 14 L/min first-stage flow: supports faster initial cylinder movement when the pump is operating in its first stage.

• 2.8 L/min high-pressure flow: helps reduce hydraulic working-stroke time compared with lower-flow models.

• Double-acting hydraulic circuit: enables powered extension and retraction of compatible cylinders.

• 30 L oil reservoir: provides an oil supply for appropriately sized hydraulic systems.

• Remote control: allows the operator to control the unit from the working position.

• Glycerine-filled pressure gauge: helps dampen needle vibration for easier pressure monitoring.

• CraftOil technical support: assistance with model selection, connection questions and spare parts in Ukraine.

Why Choose the 380 V Three-Phase Version?

The 220 V single-phase and 380 V three-phase versions are specified with the same hydraulic performance:

• Maximum operating pressure: 700 bar.

• First-stage flow rate: 14 L/min.

• High-pressure flow rate: 2.8 L/min.

• Motor power: 3 kW.

• Reservoir capacity: 30 litres.

• Double-acting hydraulic circuit.

The main difference is the electrical supply and motor configuration.

220 V vs 380 V Hydraulic Power Unit

Current values and circuit protection are indicative and must be confirmed against the motor nameplate, wiring diagram, starting method and installation conditions. The 380 V version cannot be connected directly to a standard 220 V single-phase supply.

Practical Advantages of Three-Phase Power

Where a suitable three-phase supply is available, a three-phase motor can offer operational advantages:

• More balanced motor torque compared with a conventional single-phase motor.

• No single-phase starting capacitor when the motor is configured as a standard three-phase induction motor.

• Lower current per phase than the corresponding single-phase arrangement, subject to the actual motor and supply.

• A practical fit for industrial workshops already equipped with three-phase power.

These characteristics can make the three-phase configuration attractive for equipment used frequently throughout a shift. However, actual motor temperature, service life and energy consumption depend on the motor design, load, duty cycle, ventilation and maintenance.

Our recommendation: if your facility has a suitable 380 V three-phase supply, this version is worth considering. If only a suitable 220 V single-phase supply is available, choose the corresponding 220 V model instead. Its specified hydraulic performance is the same.

Important During Initial Installation: Check Motor Rotation

Correct phase sequence is essential for a three-phase motor driving a hydraulic pump.

Depending on the motor and pump configuration, an incorrect phase sequence can cause the motor to rotate in the wrong direction. The pump may then fail to deliver oil as intended, and operating it incorrectly can damage hydraulic components.

Recommended Commissioning Procedure

1. Have a qualified electrician make the electrical connection. Verify the supply voltage, phase configuration, protective earthing and circuit protection.

2. Check the oil level before starting. Fill the reservoir to the level specified by the manufacturer using the approved hydraulic oil.

3. Verify the motor’s rotation direction. Follow the manufacturer’s commissioning instructions and any rotation indicator on the motor.

4. Perform the initial test in accordance with the manual. Confirm that the motor and pump operate correctly and that the system develops pressure as specified.

5. Stop the unit if pressure does not build as expected. Do not continue running the pump in an attempt to force it to work.

6. Have the electrician correct the phase sequence if necessary. Any changes to the electrical connections must be made with the equipment safely isolated.

7. Proceed to normal operation only after correct rotation and hydraulic operation have been confirmed.

Do not rely on the pressure gauge alone to determine motor rotation. The installation and commissioning procedure must follow the equipment manual.

CraftOil can provide guidance on model selection and connection questions before purchase.

What Does 3 kW Mean for Hydraulic Cycle Time?

The high-pressure flow rate affects how quickly oil is delivered to the cylinder while the pump operates at its high-pressure stage.

The following estimates compare the stated flow rates of the CraftOil power-unit range.

High-Pressure Flow Rate Comparison

These values are theoretical estimates based on oil volume divided by the specified flow rate. Actual cylinder movement depends on operating pressure, cylinder dimensions, effective chamber volume, hydraulic losses and operating conditions.

For example, the theoretical time to deliver 0.5 litres at the high-pressure stage is approximately 11 seconds at 2.8 L/min, compared with 33 seconds at 0.9 L/min.

In repeated production operations, shorter working strokes can contribute to improved throughput. The actual time savings for a complete cycle depend on the connected machine and its operating sequence.

Double-Acting Hydraulic Circuit

This hydraulic power unit is designed for compatible double-acting hydraulic cylinders.

A double-acting cylinder has two working chambers. Hydraulic oil is directed alternately to the piston side and rod side, allowing controlled movement in both directions.

The unit uses two working lines, A and B, with a manual two-position directional valve to switch the hydraulic flow.

When Is a Double-Acting Power Unit Required?

Choose this configuration when:

• Your hydraulic cylinder has two working ports.

• The rod must retract under hydraulic pressure.

• You need controlled movement in both directions.

• The application requires a powered return stroke.

• Your equipment uses a compatible double-acting hydraulic circuit.

Typical applications include hydraulic presses, pipe benders, bearing pullers and industrial fixtures with double-acting cylinders.

Quick compatibility check: a cylinder with two ports may indicate a double-acting design, but the port count alone is not conclusive. Confirm the cylinder type, port functions, valve arrangement and pressure rating in the equipment documentation.

If you are unsure, send CraftOil a photograph of the cylinder, its identification plate and the hydraulic connections. We can help you assess compatibility.

30 L Hydraulic Reservoir: Capacity and Temperature Management

The 30-litre reservoir supplies oil to the connected hydraulic system and helps manage temperature during operation. Its suitability depends on the equipment’s oil requirements, operating cycle and heat generation.

Oil Volume and Equipment Compatibility

As a preliminary sizing guideline, the oil available in the system should exceed the required working oil volume by approximately 20–30%, subject to the hydraulic system design and manufacturer’s instructions.

A 30 L reservoir may therefore be suitable for certain systems with an estimated working oil requirement of approximately 23–24 litres. This is an indicative example, not a universal maximum cylinder volume.

For a double-acting cylinder, consider the effective oil volume required by both chambers and the complete operating cycle. Also account for the permitted tank fill level, minimum oil level and any other hydraulic components in the circuit.

Oil Temperature During Intensive Operation

A common preliminary reservoir-sizing guideline is approximately three to five times the pump’s nominal flow per minute. At 14 L/min, this would suggest a reservoir of roughly 42–70 litres.

This is a rule of thumb rather than a universal requirement. Actual reservoir sizing depends on pump efficiency, pressure, operating cycle, ambient temperature, cooling conditions and the hydraulic system design.

The 30 L tank may be suitable for short or intermittent cycles. During intensive or continuous operation, oil temperature should be monitored carefully.

Recommended practices:

• Monitor oil temperature during repeated or high-load cycles.

• Avoid unnecessary pump operation when the system is not performing useful work.

• Allow cooling periods if the oil temperature approaches or exceeds the manufacturer’s permitted range.

• Assess whether an oil cooler or heat exchanger is needed for continuous-duty applications.

• Use only the oil grade specified for the power unit.

The three-phase motor configuration may offer motor-operating advantages, but it does not eliminate hydraulic heat generation or guarantee a lower overall oil temperature.

For continuous or round-the-clock operation, contact CraftOil to discuss the actual duty cycle and cooling requirements.

Technical Specifications

Electrical protection, cable size, motor current and connection details must be confirmed against the nameplate, wiring diagram, local electrical regulations and the actual installation.

Pressure Gauge: 1,000 Bar Scale, 700 Bar Maximum Pressure

The supplied glycerine-filled pressure gauge has a scale extending to 1,000 bar. The hydraulic power unit’s specified maximum operating pressure remains 700 bar.

These are two different specifications:

• 700 bar is the stated maximum operating pressure of the power unit.

• 1,000 bar is the upper limit of the pressure gauge’s scale.

A gauge with a higher scale limit does not increase the pressure rating of the power unit.

Glycerine helps dampen needle vibration and can improve readability in applications with mechanical pulsation. Always ensure that the power unit, hoses, fittings, valves, cylinder and other connected components are rated for the intended operating pressure.

The maximum permitted pressure of the lowest-rated component must never be exceeded.

Remote Control for Convenient Operation

The remote control allows the operator to start and stop the power unit from the working position, according to the supplied control configuration.

Remote operation can be useful for workshop applications where the operator needs to remain near the connected equipment. However, it does not replace appropriate guarding, safe positioning, pressure checks or the manufacturer’s operating procedures.

Before each working cycle, confirm that the hydraulic lines are correctly connected and all components are suitable for the intended pressure.

Package Contents

The standard package includes:

• CraftOil double-acting hydraulic power unit, 3 kW, 380 V.

• High-pressure hydraulic hose, 2 m.

• Quick-release hydraulic coupling.

• Glycerine-filled pressure gauge, scale up to 1,000 bar.

• Pressure gauge adapter.

• Remote control.

• Operating instructions.

Hydraulic oil is not included. The reservoir capacity is 30 litres. The actual filling quantity depends on the permitted oil level and the hydraulic circuit. Contact CraftOil for advice on selecting the correct oil grade.

Applications

The CraftOil 3 kW three-phase double-acting hydraulic power unit may be suitable for compatible equipment such as:

• Hydraulic cable lug crimping machines.

• Hydraulic cable cutters.

• Busbar bending machines.

• Industrial hydraulic presses, including cable-processing presses.

• Double-acting hydraulic cylinders.

• Compatible hydraulic jacks.

• Hydraulic pipe benders.

• Bearing and pulley pullers.

• Industrial hydraulic fixtures and pressing systems.

• Other hydraulic machinery designed for the unit’s pressure, flow rate and connection configuration.

Who Is This Model Best For?

This version is particularly worth considering for:

• Manufacturing workshops with a suitable three-phase supply.

• Electrical installation companies performing cable crimping in batches.

• Industrial maintenance and repair departments.

• Service centres equipped with compatible three-phase power.

• Production lines where hydraulic equipment operates repeatedly throughout a shift.

• Facilities using compatible double-acting cylinders that require higher oil flow.

The best choice depends on the cylinder, pressure requirements, working oil volume, number of cycles per shift, electrical installation and duty cycle.

CraftOil Hydraulic Power Unit Range

Compare the main specifications to choose the appropriate configuration.

The table summarises the supplied model specifications. Confirm the exact model code, connection details and electrical requirements before ordering.

How to Choose the Right Model

1. Do you have a three-phase electrical supply?

If a suitable 380 V three-phase supply is available, this version may be a good fit. If not, consider the corresponding 220 V model.

2. Does your cylinder require a double-acting circuit?

Check the cylinder documentation and hydraulic connections. A double-acting cylinder requires a compatible power unit and valve arrangement.

3. How frequently will the equipment operate?

For repeated operations where higher flow can reduce working-stroke time, the 3 kW model may be appropriate. Lower-powered models may be sufficient for occasional tasks.

4. What is the hydraulic oil requirement?

Select the reservoir based on the actual hydraulic circuit and cylinder requirements. Do not choose tank capacity by cylinder tonnage alone.

Compatibility with CraftOil Hydraulic Presses

CraftOil manufactures hydraulic presses in 30-tonne and 50-tonne configurations and has practical experience with hydraulic equipment in its own production environment.

The correct power unit depends on the press’s cylinder, operating pressure, flow requirements, hydraulic circuit, connections and electrical supply. The fact that a press has a particular force rating does not, by itself, establish compatibility.

Before connecting this power unit, confirm:

• Cylinder type and hydraulic port configuration.

• Required operating pressure.

• Required oil flow and working volume.

• Valve and quick-release coupling compatibility.

• Hose and fitting pressure ratings.

• Three-phase supply and motor connection requirements.

• Permitted operating cycle and oil temperature limits.

Contact CraftOil with the press model and technical details. We can help assess whether this 3 kW, 380 V unit is appropriate or whether another configuration would better suit your application.

Recommended Hydraulic Oil

The exact hydraulic oil specification must be confirmed in the product manual.

The supplied source information indicates industrial hydraulic oils in the ISO VG 32 or ISO VG 46 viscosity classes, including compatible HLP 32/HLP 46 products and equivalent oils approved for the application.

Before filling the reservoir:

• Confirm the oil grade: follow the manufacturer’s instructions and operating-temperature requirements.

• Check the fill level: the nominal tank capacity is 30 litres, but the permitted oil level must follow the manual.

• Keep the oil clean: use suitable filtration when filling.

• Monitor temperature: intensive operation can increase oil temperature.

• Follow maintenance instructions: inspect the oil and replace it at the intervals specified for the equipment and working conditions.

• Do not mix oils indiscriminately: confirm compatibility before changing oil type or manufacturer.

CraftOil can help you identify the appropriate hydraulic oil for the unit and your application.

Safety and Operation

A hydraulic system operating at 700 bar requires correct installation, pressure-rated components and trained operators.

• Have a qualified electrician install the three-phase electrical connection.

• Confirm protective earthing and suitable circuit protection.

• Verify the motor’s rotation direction during initial commissioning.

• Check the oil level before starting the pump.

• Inspect hydraulic hoses and fittings before each use. Replace damaged, cracked, swollen or leaking components.

• Confirm that lines A and B are connected to the correct ports.

• Never disconnect a quick-release coupling while the system is pressurised.

• Never exceed the rated pressure of the power unit, hoses, cylinder, valves or fittings.

• Never use your hands to locate a high-pressure oil leak. High-pressure fluid injection injuries can be severe.

• Wear suitable eye protection and follow the equipment manufacturer’s operating procedures.

• Depressurise the system according to the manual before maintenance or disconnection.

• The unit weighs 51 kg. Use suitable lifting equipment or a safe team-lifting procedure.

The pressure gauge’s 1,000 bar scale does not permit the power unit to operate above its specified 700 bar maximum.

Warranty, Spare Parts and Service

CraftOil provides support for this model under the following terms:

• Warranty: 3 months, as specified for this product.

• Spare parts in Ukraine: commonly required components, including seals, pressure gauges, hoses, quick-release couplings, directional valves and remote controls, subject to current stock.

• Technical assistance: guidance on connection, phase sequence and setup by phone, Viber or Telegram.

• Collection: from the CraftOil warehouse in Kharkiv.

• Delivery within Ukraine: dispatch by Nova Poshta.

For international orders, contact CraftOil to confirm shipping availability, delivery terms and service options for your destination.

Why Buy from CraftOil?

Practical manufacturing experience. CraftOil manufactures hydraulic presses and understands the importance of matching a power unit to the cylinder, circuit and operating conditions.

Help with commissioning. We can explain the key checks required for a three-phase installation, including the importance of verifying motor rotation before normal operation.

Honest equipment selection. The highest motor power is not always the best option. If a 1.5 kW model or the 220 V version is more suitable for your needs, we will help you assess that choice.

Service and spare parts in Ukraine. Access to technical assistance and commonly used replacement components can help reduce unnecessary downtime.

Support with hydraulic oil selection. We can help identify the appropriate oil grade and filling requirements based on the product documentation.

Convenient ordering. Payment options may include card payment, bank transfer using company details and instalment payment, subject to current availability and terms.

Frequently Asked Questions

What is the advantage of the 380 V version over the 220 V model?

The specified hydraulic performance is the same. The 380 V version uses a three-phase supply, which can provide balanced motor operation and lower current per phase when correctly configured. It is intended for facilities with a suitable three-phase electrical connection.

Can I connect the 380 V power unit to a standard 220 V single-phase outlet?

No. This version requires a compatible three-phase supply. If your facility has only single-phase power, consider the corresponding 220 V model.

What should I do if the motor runs but the system does not build pressure?

Stop the unit and follow the commissioning instructions. Incorrect motor rotation caused by the phase sequence is one possible explanation, but it is not the only one. Have a qualified electrician verify the electrical connection and confirm correct pump operation before restarting.

What circuit breaker is required?

The source specifications indicate an approximate current of 6–7 A per phase and a three-pole 10–16 A breaker. The final breaker rating and cable size must be selected by a qualified electrician using the motor nameplate, starting current, wiring diagram and installation conditions.

How much faster is the 3 kW model than the 0.75 kW model?

At the specified high-pressure stage, the 3 kW unit delivers 2.8 L/min compared with 0.9 L/min for the 0.75 kW model. This is approximately 3.1 times the flow rate. Actual working-stroke and complete-cycle times depend on the connected equipment.

Is a 30 L reservoir sufficient at 14 L/min?

It may be suitable for certain intermittent applications. For intensive or continuous operation, monitor oil temperature and assess the system’s cooling requirements. Reservoir capacity alone does not establish continuous-duty suitability.

What is the maximum operating pressure?

The specified maximum operating pressure is 700 bar (70 MPa). The gauge scale extends to 1,000 bar, but this does not increase the power unit’s pressure rating.

Which hydraulic oil should I use?

The source specifications indicate ISO VG 32 or ISO VG 46 industrial hydraulic oil, including compatible HLP products. Confirm the approved grade in the product manual before filling.

Is hydraulic oil included?

No. Hydraulic oil is not included in the standard package.

What is the warranty period?

The specified warranty for this model is three months. Contact CraftOil for the applicable warranty conditions and service details.

Can I use this power unit with a CraftOil hydraulic press?

Potentially, provided the press’s cylinder, hydraulic circuit, pressure requirements, flow rate, connections and electrical supply are compatible. Contact CraftOil with your press model and technical details before connecting the unit.

Can CraftOil deliver outside Ukraine?

Contact CraftOil to confirm international shipping availability, delivery terms and service options for your destination.

Order Your CraftOil 3 kW, 380 V Hydraulic Power Unit

Looking for a three-phase double-acting hydraulic power unit with 700 bar maximum operating pressure, 14 L/min first-stage flow and a 30 L reservoir?

Contact CraftOil before ordering. Tell us about your hydraulic cylinder, equipment, operating cycle and available three-phase supply. We will help you assess compatibility and determine whether this model is the right choice for your application.

CraftOil — hydraulic equipment backed by practical manufacturing experience and technical support.