| Basic Function |
Hydraulic power pack |
An electric motor or engine drives a hydraulic pump, which converts mechanical energy into pressurized hydraulic fluid. The fluid then moves an actuator or hydraulic motor. |
Reservoir, pump, prime mover, valves, filters, pressure-relief protection, and control components are commonly integrated into one compact assembly. |
Lifting, clamping, steering, material handling, industrial machinery, mobile equipment, and compact automation systems. |
Choose the unit according to required pressure, flow, duty cycle, actuator size, installation space, and control method. |
| Power Source |
AC electric motor |
Electrical energy drives the hydraulic pump through a motor and coupling. |
Common industrial motor ratings include approximately 0.25–30 kW; three-phase motors are widely used for continuous industrial duty. |
Factory equipment, presses, machine tools, loading systems, and indoor installations. |
Check voltage, frequency, phase, motor enclosure, starting current, and thermal protection. |
| Power Source |
DC electric motor |
A battery or vehicle electrical system powers a compact DC motor connected to the hydraulic pump. |
Common systems use 12 V or 24 V DC; 48 V configurations are also used in selected mobile and industrial applications. |
Tail lifts, wheelchair lifts, mobile platforms, small dump bodies, and battery-powered equipment. |
Battery capacity, cable size, motor duty cycle, maximum current, and protection against voltage drop are important. |
| Pump Type |
External gear pump |
Meshing gears carry hydraulic fluid from the inlet to the outlet and generate flow against system resistance. |
Compact and economical; commonly used for moderate flow and pressure applications. Typical efficiencies are lower than those of piston pumps. |
General industrial machinery, lifting systems, agricultural equipment, and simple hydraulic circuits. |
A practical choice where cost, compact size, and straightforward maintenance are more important than very low noise or maximum efficiency. |
| Pump Type |
Vane pump |
Sliding vanes in a rotating rotor transport fluid through the pump chambers. |
Provides smoother flow and generally lower noise than a basic gear pump; suitable for moderate pressure applications. |
Industrial power units, machine tools, plastic-processing equipment, and systems requiring smoother operation. |
Requires clean hydraulic oil and proper inlet conditions to reduce vane wear and cavitation risk. |
| Pump Type |
Axial piston pump |
Rotating pistons reciprocate inside a cylinder block to deliver pressurized hydraulic fluid. |
High pressure capability, high efficiency, and fixed- or variable-displacement configurations are available. |
High-force equipment, injection machinery, mobile machinery, test systems, and demanding industrial applications. |
Higher initial cost and greater sensitivity to contamination make filtration, oil quality, and maintenance especially important. |
| Pressure Range |
Low-pressure power pack |
The pump supplies fluid pressure adequate for low-force actuation and circulation tasks. |
Usually below approximately 100 bar, depending on the circuit and component ratings. |
Small clamps, light-duty lifting mechanisms, lubrication systems, and low-force automation. |
Do not select a low-pressure unit when the actuator must overcome high loads or shock conditions. |
| Pressure Range |
Medium-pressure power pack |
Pressurized oil is directed through valves to generate moderate actuator force and speed. |
Approximately 100–250 bar is common for many general-purpose hydraulic systems. |
Material handling, compact presses, lifting platforms, agricultural machinery, and industrial automation. |
Verify the continuous working pressure, peak pressure, relief-valve setting, and cylinder load requirements. |
| Pressure Range |
High-pressure power pack |
A high-pressure pump delivers oil to actuators that require substantial force from a compact system. |
Approximately 250–350 bar is used in many high-pressure applications; actual limits depend on component design. |
Heavy-duty presses, hydraulic tools, compact construction equipment, and high-force clamping systems. |
Every component, hose, fitting, valve, and reservoir connection must be rated for the intended pressure and safety margin. |
| Flow Rate |
Low-flow configuration |
The pump supplies a small volume of oil per minute, typically prioritizing compact size and controlled movement. |
Approximately 0.5–5 L/min is common for small actuators and precise low-speed movement. |
Small lifting devices, compact clamps, medical or accessibility equipment, and light automation. |
Lower flow generally reduces actuator speed; confirm cylinder displacement and required cycle time. |
| Flow Rate |
Medium-flow configuration |
The pump provides a balance between actuator speed, motor size, heat generation, and reservoir capacity. |
Approximately 5–30 L/min is common for general-purpose power units. |
Machine tools, industrial lifting systems, mobile equipment, and medium-sized actuators. |
Calculate flow from actuator area and target speed, then check motor power and thermal performance. |
| Flow Rate |
High-flow configuration |
A larger-displacement or multi-pump arrangement supplies sufficient oil for rapid or multiple actuator movement. |
Above approximately 30 L/min; larger systems may require increased motor power, cooling, and reservoir volume. |
Large presses, rapid-cycle machinery, multiple hydraulic circuits, and heavy mobile equipment. |
Evaluate pressure-flow combinations carefully because hydraulic power and heat generation increase with both parameters. |
| Valve Configuration |
Single-acting circuit |
Hydraulic pressure moves the actuator in one direction, while a spring, gravity, or external load provides return movement. |
Usually uses one pressure port and a return or tank connection; valve selection depends on load-holding requirements. |
Dump bodies, lifting tables, jacks, clamps, and simple lifting applications. |
Confirm that the load can return the actuator safely and that lowering speed can be controlled. |
| Valve Configuration |
Double-acting circuit |
Hydraulic pressure is directed alternately to both sides of the actuator for controlled extension and retraction. |
Commonly uses a directional control valve with two work ports and a pressure-relief valve. |
Hydraulic cylinders, positioning systems, steering mechanisms, presses, and automated machinery. |
Consider valve center condition, actuator synchronization, load holding, and required cycle speed. |
| Reservoir Capacity |
Compact reservoir |
The tank stores enough fluid for a small circuit while keeping the power pack lightweight and space efficient. |
Approximately 1–10 L is common for small intermittent-duty systems. |
Portable tools, compact lifts, small clamps, and limited-cycle equipment. |
Allow adequate fluid volume for cylinder displacement, thermal expansion, deaeration, and safe minimum level. |
| Reservoir Capacity |
Standard industrial reservoir |
The reservoir stores and cools hydraulic oil while allowing air and contaminants to separate from the fluid. |
Approximately 10–100 L is common, although the required size depends on flow, duty cycle, and heat load. |
Industrial machinery, lifting equipment, presses, and continuous or repeated-cycle applications. |
Tank sizing should account for return-flow aeration, heat dissipation, maintenance access, and fluid expansion. |
| Control Method |
Manual control |
An operator activates a lever, hand valve, or push-button control to direct hydraulic flow. |
Simple wiring and valve arrangements; suitable for applications with direct operator supervision. |
Service equipment, basic lifts, maintenance tools, and low-volume machinery. |
Cost effective, but it may not provide the repeatability or remote monitoring available with electronic controls. |
| Control Method |
Solenoid or PLC control |
Electrical signals operate directional valves and can be integrated with sensors, switches, or a programmable controller. |
Supports automated sequences, interlocks, position feedback, and remote operation. |
Production lines, automated presses, packaging machinery, and coordinated motion systems. |
Check voltage, connector protection, control logic, emergency-stop requirements, and electromagnetic compatibility. |
| Efficiency and Heat |
Fixed-displacement system |
The pump delivers a fixed volume per revolution; excess flow is commonly bypassed through a relief or unloading circuit. |
Simple and economical, but throttling and bypass flow can generate heat during extended operation. |
Intermittent-duty equipment and applications with relatively stable flow demand. |
Use suitable cooling, unloading, or accumulator arrangements when operating continuously under high pressure. |
| Efficiency and Heat |
Variable-displacement system |
The pump adjusts displacement to match system demand, reducing unnecessary flow and energy consumption. |
Higher efficiency potential and better control of power consumption, with increased system complexity. |
High-duty-cycle machinery, variable-speed applications, and systems with changing flow requirements. |
Higher purchase cost may be justified when energy savings, lower heat generation, and precise control are priorities. |
| Reliability |
Filtration and contamination control |
Filters remove particles from the hydraulic fluid before contamination damages pumps, valves, and actuators. |
Filter ratings are specified in micrometres and may include suction, pressure-line, and return-line filtration. |
All hydraulic systems, especially high-pressure and servo-controlled equipment. |
Use clean oil, correct filter ratings, proper breathers, and scheduled filter replacement to extend component life. |
| Safety |
Pressure-relief protection |
A relief valve limits system pressure by diverting fluid when pressure exceeds its set value. |
Relief settings must remain within the lowest rated pressure of the pump, valves, hoses, cylinders, and fittings. |
Essential for virtually every hydraulic power pack. |
Never block or improperly adjust the relief valve; use guarding, emergency stops, and safe maintenance procedures. |
| Best-Fit Criteria |
Recommended specification for a general-purpose unit |
A balanced configuration combines an appropriately sized motor, gear or vane pump, relief protection, filtration, reservoir, and directional valve. |
Typical starting range: 12–24 V DC or 400 V three-phase motor, 5–30 L/min flow, and 100–250 bar working pressure, subject to application calculations. |
General lifting, clamping, material handling, and medium-duty industrial machinery. |
The best power pack is not determined by origin alone; it should be selected through verified pressure-flow performance, component compatibility, testing, documentation, service support, and compliance with applicable safety requirements. |