Single-Acting Hydraulic Power Unit User Manual

Safety Information

⚠️ WARNING

• DO NOT operate in an enclosed area as you risk carbon monoxide poisoning from the engine exhaust.
• DO NOT search for leaks with your hands or other body parts. Pressurized fluid can penetrate the skin causing serious injury or death. If the fluid penetrates the skin, seek medical attention immediately.
• DO NOT remove the hydraulic reservoir cap while the power unit is running.
• Wear proper eye protection when searching for a high-pressure hydraulic leak.
• Ensure the pressure does not exceed the maximum pressure given in the specifications.
• Operate in a well-lit, clean, and safe environment free of distractions.
• Wear appropriate protective equipment when operating or near the running power unit: goggles that provide front and side protection for eyes, protective gloves appropriate for the work material, steel-toed boots to prevent injury from falling objects, and hearing protection gear for the noise level.
• Make sure all components are maintained in good condition. DO NOT operate if any parts of the power unit are damaged or malfunctioning. Replace any damaged or malfunctioning components.
• Always check the electrical connections are snug before use.
• DO NOT leave the equipment unattended while it is powered on.
• DO NOT operate when tired or under the influence of medication, drugs, or alcohol.
• DO NOT let children or untrained adults operate the power unit.
• Keep bystanders at a safe distance when the power unit is in operation.
• DO NOT modify the equipment in any way. Unauthorized modification may be dangerous, impair function, and reduce the service life of the equipment.
• Keep the interior of the reservoir, hydraulic cylinder, and oil pipelines clean to avoid damage to the control valve.

Parts Diagram

The diagram illustrates the components of the Single-Acting Hydraulic Power Unit. Key parts include:

• 1. Electric Motor
• 2. Anode (Pos. Pole)
• 3. Cathode (Neg. Pole)
• 4. Relay
• 5. Relay (Pos. Pole)
• 6. Reservoir
• 7. Reservoir Cap
• 8. Electromagnetic Coil
• 9. Solenoid Valve
• 10. Overflow Valve
• 11. Throttle Valve
• 12. Up Button
• 13. Down Button
• 14. Pendant Control
• 15. Control Cord
• 16. Oil Outlet

The physical unit features a reservoir with dimensions indicated as approximately L (length), 209 (height), with specific measurements like 34, 177, 15, and 82. It has a port labeled "Port M14×1.5" and mounting holes labeled "2×M10". A schematic view shows the hydraulic circuit with a motor (M), pump, relief valve, and connections for a hydraulic cylinder.

Specifications

Installation & Operation

1. Ensure the electrical supply is compatible and the motor housing is well grounded.
2. The motor's junction box should be watertight and moisture-proof.
3. Ensure your hydraulic hoses have an inner diameter no less than 0.55 in. (14 mm).
4. Connect the positive pole of the power supply to the positive pole of the relay and the negative pole of the power supply to the negative pole of the electronic motor. The power supply wire must be copper wire with a cross-section of 3.1–3.8 sq. in. (20–25 cm²).
5. Verify all fittings and connections are properly connected and tightened before operating the equipment.
6. Select a standard or premium quality, mineral-based hydraulic oil suitable for the operating temperature range.
7. Oil should be filtered with gaps no larger than 25 µm before use.
8. The optimum system operating temperature for the hydraulic oil is 120°F (49°C) and should not exceed 180°F (82°C).
9. Fill the reservoir to between ½ and 1 in. (5–30 mm) below its top. Use hydraulic oil with 5–15W (ISO VG 22–46) viscosity. Higher viscosity oil is recommended for high-temperature environments, and lower viscosity oil for low temperatures.
10. Ensure the power supply is connected correctly and then install the oil pipelines.
11. Press the UP button to turn on the motor. The motor should power the oil pump to generate pressure and discharge oil. Release the UP button, and the motor should cease operation. When viewed from the rear, the motor should turn counterclockwise. If it does not, cease operation and contact customer service.
12. At the end of the hydraulic cylinder's travel, press the DOWN button to allow oil return and the hydraulic cylinder to return to its original position. The motor does not operate during this action as it is a single-acting pump.
13. For the first operation, run the power unit under zero load for 5 minutes to cycle the actuators and remove any entrained air in the system.

Maintenance

1. Inspect equipment components periodically. Replace any damaged, worn, or malfunctioning components.
2. Keep the reservoir, actuators, and pipelines clean to prevent the introduction of foreign material into the system.
3. Ensure the reservoir is adequately filled with oil during use. Refill as necessary to prevent the pump from sucking in air.
4. Hydraulic oil should be replaced after the first 100 hours of operation. Subsequently, it should be replaced every 1500 working hours or one year, whichever comes first.

Troubleshooting

If no oil rises or the oil provides insufficient pressure:

• If pressing the UP button does not start the motor:
  • Check if the battery is low.
  • If the battery is good, check if the connections are correct and snug without unwanted grounding.
  • To check the motor directly, connect it to both ends of the power supply. The positive end of the power supply should connect to the motor's positive end, and the negative end to the motor's negative end.
  • If there is still no reaction, replace the battery. Also, check for a damaged relay or a badly connected control box. If all three are fine, replace the motor.
• If the motor works properly, but no oil is discharged or the oil provides insufficient pressure:
  • Check if the indicator light of the electromagnetic coil is lit.
  • If the light is lit, verify the circuit is properly connected. The indicator light of the electromagnetic coil should be lit, and there should be electricity in the coil when the hydraulic cylinder is moving upward.
  • If the light is off while the motor runs normally, but there is no oil discharge or insufficient pressure, remove the electromagnetic coil and clean its core with diesel or regular gasoline. Test again after cleaning. The electromagnetic solenoid valve may need replacement.
  • If problems persist after trying the above, there might be a choked pipeline or a problematic hydraulic cylinder. Inspect and fix or replace as necessary.
  • Alternatively, the required pressure for your job might exceed 3200 psi, in which case a larger hydraulic pump is needed.