The common faults and solutions of hydraulic universal testing machine are as follows:

1. Loading fault

Phenomenon: Unable to load or slow loading.

? Reason: Insufficient hydraulic oil, damaged oil pump, oil leakage in the pipeline, or stuck reversing valve.

Solution: Check the oil level and replenish hydraulic oil; Repair or replace the oil pump; Check and tighten the pipeline joints, replace damaged oil pipes; Clean the directional valve and remove impurities.

2. Unstable pressure

Phenomenon: The pointer swings or the value fluctuates greatly.

Reason: Hydraulic oil mixed with air, overflow valve blocked or worn.

Solution: Open the oil drain valve to exhaust; Disassemble and clean the overflow valve, and replace the components if it is severely worn.

3. Display abnormality

? Phenomenon: No screen display or data jumping.

? Reason: Loose sensor wiring, amplifier malfunction, or sensor damage.

Solution: Check and tighten the sensor cable; Repair the amplifier circuit; Calibrate or replace the sensor.

4. Abnormal noise

Phenomenon: Abnormal noise is emitted during operation.

? Reason: Oil pump wear, oil contamination, or loose mechanical components.

Solution: Replace the oil pump; Filter or replace hydraulic oil; Check and tighten all connecting components.

5. The crossbeam does not return to its original position

Phenomenon: After the experiment, the crossbeam cannot automatically return.

Reason: Fault in reversing valve, motor reversal, or malfunction of limit switch.

Solution: Repair the directional valve; Check if the motor wiring is correct; Replace or adjust the limit switch.

Maintenance suggestion: Regularly replace hydraulic oil (recommended every 1-2 years), clean the oil tank and filter, check the sealing of the pipeline, ensure good grounding of the equipment, which can effectively reduce the occurrence rate of failures. In case of complex faults, it is recommended to contact professional technical personnel for handling.