Early knowledge of maintenance issues for winter four column hydraulic press

2026-03-25 14:27:20

1、 Hydraulic oil and oil temperature (the first key in winter)

Timely replace/check the hydraulic oil model

Commonly used in summer: 46 # anti-wear hydraulic oil

If the temperature is below 10 ℃, it is recommended to replace it with 32 # low-temperature hydraulic oil

Long term temperature below 0 ℃: Use low-temperature specialized hydraulic oil, otherwise the oil will be too thick, difficult to start, slow to rise and fall, and the oil pump will be easily damaged.

Strictly prohibit direct high-pressure operation of refrigeration units

Just start the machine and run it without load for 5-10 minutes

Raise the oil temperature above 15 ℃ before formal pressing

Direct high pressure of cold oil is most likely to damage oil seals, burst pipes, and wear out oil pumps

Check the oil level and quality

Low oil level → suction → bubbles → shaking, abnormal noise

Oil emulsification, whitening, thinning → replace immediately

2、 Sealing components, pipeline antifreeze and crack prevention

Low temperature will make the sealing ring harder and reduce its elasticity

Easy to occur: oil leakage, pressure relief, and inability to maintain pressure

Check before winter: replace the main cylinder oil seal, guide sleeve, and valve group seal if they are aging

Key inspection of pipelines and joints

Oil pipes are brittle at low temperatures and prone to cracking due to vibration

Focus on: elbows, joints, aging rubber hoses

Replace in advance if there is oil leakage, bulging, or hardening

3、 Lubrication of moving parts (columns, guide rails, pin shafts)

Column and guide rail

In winter, the viscosity of lubricating oil increases, so it is necessary to replace it with low-temperature lubricating grease/thin oil

Manually lubricate before starting up every day to ensure smooth operation of the slider

Lack of oil can cause: lagging, shaking, scratching the chrome plating layer of the column

Pin axis and hinge parts

The crossbeam and connecting rod pin shaft of a four column Hydraulic Press

Cold weather is prone to dryness and abnormal noise

Add low-temperature butter to ensure flexible rotation

4、 Electrical and control system antifreeze

Distribution box, solenoid valve coil

Moisture and low temperature are prone to condensation, resulting in short circuits and malfunctions

Keep the distribution box closed and add desiccant if necessary

Travel switch, limit switch

Low temperature lag can lead to: no return, no deceleration, and top collision

Manually test the upper and lower limits before starting up

5、 Cooling water, cooling system (machines with coolers)

Outdoor/unheated workshops must drain water

If the water in the cooler and water-cooled oil cylinder is not drained, it will freeze and crack

After draining, blow off the residual water with compressed air

Try to turn off the cooling water in winter and rely on natural cooling

6、 Foundation, support legs, environment (especially important for four column machines)

Ground icing and slipping

The center of gravity of the four column machine is high, and the downward inertia of the slider is large

Ice on the ground can easily cause displacement and vibration, leading to decreased accuracy and shaking

Try to keep the workshop temperature above 5 ℃ as much as possible

It's really not possible, add an electric insulation sleeve to the fuel tank

Stable oil temperature doubles machine lifespan

7、 Daily operation precautions

Start up with no load and repeat up and down several times to preheat

No sudden high pressure, no rapid impact suppression

If slow lifting, abnormal noise, and shaking are found, immediately stop the machine and check the oil temperature and quality

Lower the slider to a low position before leaving work to reduce the long-term stress on the oil cylinder

8、 Summarize the key points of winter maintenance in one sentence

Change the correct oil, preheat first, lubricate frequently, seal tightly, prevent water freezing, and control oil temperature