Hydraulic universal testing machine is a widely used equipment for testing the mechanical properties of materials, mainly used for tensile, compressive, bending, shear and other mechanical tests of metal and non-metal materials (such as plastics, rubber, concrete, etc.). Its core characteristics are high load capacity, high precision, and good stability, suitable for industrial, scientific research, quality inspection, and other fields. Regular maintenance of hydraulic universal testing machines is key to ensuring equipment accuracy, extending service life, and ensuring operational safety.
1、 Daily maintenance
1. Operating instructions
-Select the appropriate clamp (V-shaped for round materials) based on the shape and size of the sample.
-The clamping length of the sample must be greater than three-quarters of the jaw length.
-After both the upper and lower jaws hold the sample, it is forbidden to operate the lifting crossbeam.
-Clamping sequence: clamp upwards first and then downwards; Release sequence: Release downwards first and then upwards.
2. Cleaning work
-After the experiment is completed, promptly clean the workbench, fixtures, and surrounding debris such as oil stains and metal shavings.
-Wipe the outer surface of the equipment with a clean cotton cloth to maintain cleanliness and prevent dust from entering the hydraulic system.
3. Hydraulic system inspection
-Check the oil level in the tank (should be above 2/3 of the oil level), and replenish the same type of hydraulic oil in a timely manner if it is insufficient.
-Observe the color of the oil. If it is cloudy or emulsified (turning white), replace it with new oil.
-Check for leaks in the oil pipes and joints, and tighten any loose parts.
4. Lubrication and maintenance
-Apply lubricating grease (such as molybdenum disulfide lubricant) between the guide rail, screw, bearing, clamp plate, and crossbeam dovetail at least once a month.
-Check the chain or gear transmission parts to ensure good lubrication.
5. Fixture inspection
-Clean the rust or wear on the clamping surface of the fixture to avoid affecting the clamping force of the sample.
-Check if the fixture bolts are loose.
2、 Regular maintenance (every 3-6 months or 500 hours)
1. Hydraulic oil replacement
-It is recommended to change the oil after 500 hours of initial use, and then every 2000 hours or annually (depending on the frequency of use).
-Clean the inside of the oil tank during oil change to remove sediment and impurities.
2. Maintenance of oil filter
-Clean or replace the oil suction filter and high-pressure filter to prevent blockage and damage to the oil pump.
3. Inspection of key components
-Check if the oil pump and motor are running smoothly and if there are any abnormal noises.
-Verify the accuracy of pressure gauges and sensors to ensure accurate data.
-Check whether the electrical circuit is aged or loose.
4. Safety device testing
-Verify whether overload protection, emergency stop switch, and limit device are sensitive and reliable.
3、 Long term disuse maintenance
1. Clean the equipment and apply rust proof oil (such as guide rails, unpainted metal surfaces).
2. Run the hydraulic system without load for 10 minutes every month to circulate and prevent seal aging.
3. Disconnect the power and cover with a dust cover.
4、 Precautions
1. Hydraulic oil selection
-It is recommended to use ISO VG46 or VG68 anti-wear hydraulic oil, and different brands of oil should not be mixed.
2. Environmental requirements
-The equipment should be placed in a dry, dust-free environment with a temperature of 5 ℃~35 ℃, avoiding direct sunlight.
3. Operating standards
-Overloading is strictly prohibited to avoid sudden pressurization or unloading.
-Clamp and align the sample to prevent damage to the sensor due to unbalanced load.
4. Fault handling
-In case of oil leakage, abnormal vibration or abnormal data, immediately stop the machine and contact professional personnel for maintenance.
5、 Maintenance records
It is recommended to establish a maintenance ledger to record the time, content, replacement of parts, and problems discovered during each maintenance, in order to facilitate tracking of equipment status.
Please refer to the equipment manual for specific maintenance cycles and operations. If necessary, please contact us for guidance from professional technicians. Regular professional calibration (such as once a year) can ensure the accuracy of experimental data.
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