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2018 Ultimate Guide: Two Forms Let You Understand Plate Flating Machine Hydraulic System Glitch

If you work in the metalworking industry and often use hydraulic presses, you will inevitably encounter some minor malfunctions to stop the machine. Here I will list two tables of the common faults of the Plate Bending Machine. Quick check so that you can quickly resume your machine work....


the reason


Pump does not come out of oil

Low oil pressure in the tankBe careful not to allow the oil to fall to the underside of the oil level gauge during operation.

Suction pipe obstructed oil absorption is not smooth

Clean the suction tube and all filters

Suction pipe sucks air

Seal the connector partially

The reverse direction of the oil pump

Change steering to meet requirements

Hydraulic oil viscosity is not suitable for local conditions

Use hydraulic oil suitable for the local area

Insufficient oil pump speed

Should reach the prescribed minimum speed

Oil in the air

 Investigate air mixing in and repair

The pressure on the circuit does not go up

Because of the above reasons the pump does not come out of oil

Implement the above measures

The pressure set by the system has not reached the specified value

Resetting pressure with pressure gauge

Safety valve does not work

Remove to repair or replace new parts

Leakage inside valve and cylinder

The hydraulic circuit smoothly divides the area and checks each relatively independent part

Hydraulic valve does not work

Check each hydraulic valve and investigate the electrical circuit

Pump failure

Take the pump out for repair or replace it with a new one

Hydraulic system leaks

Check and repair

Damaged cylinder piston seal material

Repair cylinder replacement seal

Inverted valve commutation fault

Check and repair shuttle valve

Is there any dust in the control system?

Sweep clean

Suction tube, filter blocked

Sweep clean, wash filter

Cylinder pressure cannot hold

Damaged cylinder seal material

Repair cylinder replacement seal

Superimposed pilot-operated check valve leak in the circuit

Clean or replace the stacked pilot operated check valve

In-circuit one-way throttle check valve oil leakage

Clean or replace stacked check valve

System valve block leakage

Check valve block and repair

Pressure gauge or pressure gauge switch leaks on the circuit

Replace seal or change parts


the reason


Oil pump noise abnormal

Oil pump inlet pipe into the air

Combined with grease seal, if the sound becomes smaller, tighten or replace the seal

Air from the pump side

Around the shaft with grease seal, if the sound becomes smaller, replace the seal

Loose pump and motor bolts

Tighten the bolt

Motor and oil pump do not care

Check and repair

Overflow valve vibration

Investigate whether there is air entering

The oil is too thick

Use with local suitable hydraulic oil

Oil pump suction pipe filter blocked

Cleaning or changing parts

The direction of rotation of the oil pump is reversed

Correct the direction of rotation

There are air bubbles in the oil

Investigate the presence of moisture in the return pipe

Oil level below baseline

Add oil to the baseline

Beyond the prescribed rotation pressure

Adjust the rotation number and pressure

Slow cylinder operation

Damage to tubing and pipe seals

Perform single-piece test run and replace the sealing element

The specified amount of oil has not flowed from the pump

Refer to the oil pump failure, as a benchmark to repair

Improper adjustment of speed control valve


Large reaction force to the cylinder

Increase the size of the tube or increase the pressure on the system