Regular press brake maintenance helps identify wear, lubrication issues, hydraulic problems and tooling damage before they begin to affect production or develop into more serious faults.
The maintenance required depends on the type of press brake, its drive system, workload and manufacturer. A hydraulic press brake has different maintenance requirements from a servo-electric machine, while individual models can also have their own lubrication, inspection and service schedules.
The machine manufacturer’s maintenance instructions should therefore remain the basis of the maintenance programme, supported by regular operator checks and planned servicing.
Regular Press Brake Checks
Operators are often the first to notice a change in how a press brake is running. Regular visual and operational checks can identify problems before they cause an unexpected stoppage.
Checks should include the general condition of the machine, tooling and guards, together with any visible leaks, loose components, unusual noise or changes in machine operation.
Any warning or fault shown by the CNC control should be investigated rather than repeatedly cleared without establishing the cause.
Hydraulic System Maintenance
Hydraulic press brakes rely on the condition of the hydraulic system to generate and control the bending movement.
Oil level and condition should be checked in accordance with the machine manufacturer’s instructions, while hoses, connections, cylinders and other hydraulic components should be inspected for signs of leakage or damage.
Hydraulic oil and filters need to be maintained according to the schedule specified for the particular machine. Contamination or deterioration of the oil can affect hydraulic components and machine operation.
The correct hydraulic oil specification should always be used rather than selecting oil on viscosity alone.
Servo-Electric Press Brake Maintenance
Servo-electric press brakes do not use the hydraulic bending system found on conventional hydraulic machines, but this does not make them maintenance-free.
The mechanical and electrical drive components need to be inspected and maintained according to the design of the machine. Different servo-electric press brakes can use different drive arrangements, including belt and ball-screw systems.
Maintenance requirements should therefore be based on the particular drive system rather than applying the same procedure to every electric press brake.
Our hydraulic vs servo-electric press brake guide explains the main differences between the two machine configurations.
Press Brake Lubrication
Moving components need the correct lubrication at the points specified by the machine manufacturer.
Lubrication requirements can include guideways, bearings, screws and other moving assemblies depending on the machine design. Some machines use automatic lubrication systems, but these still need to be checked to make sure lubricant is available and reaching the required points.
Using the correct lubricant and following the specified lubrication intervals is important. Over-lubrication or using an unsuitable product can cause problems just as insufficient lubrication can.
Back Gauge Maintenance
The back gauge is repeatedly repositioned during production and needs to remain free-moving and accurate.
Guides, screws, bearings and drive components should be kept clean and maintained in accordance with the machine specification. Sheet metal debris, dirt and poor lubrication can interfere with moving components.
If components begin to show inconsistent flange dimensions, the back gauge and its positioning should be checked rather than assuming the problem is with the CNC programme.
Press Brake Tooling Inspection
Punches and dies should be inspected regularly for damage, excessive wear and contamination.
Working surfaces should be kept clean, and damaged tooling should not continue to be used simply because it can still produce a bend. Tool damage can affect the finished component and may also create a safety issue under load.
The tooling also needs to remain within its permissible load. High bending forces concentrated over a short section can exceed tooling capacity even when the press brake itself has sufficient available tonnage.
Our press brake tooling guide covers punches, dies, V-openings, tooling capacity and tool selection in more detail.
Tool Clamping & Seating
Tooling needs to be correctly seated and secured before bending begins.
Clamping surfaces should be kept clean and inspected for damage. Dirt or debris between the tooling and clamping surfaces can prevent correct seating and affect the position of the tool.
Where hydraulic or other powered clamping systems are fitted, their operation should be included within the machine’s regular inspection and maintenance programme.
Checking Bending Accuracy
A change in bending accuracy can be an early indication that part of the machine, tooling or setup needs attention.
Before making repeated programme corrections, check the material, tooling condition, tool seating and back gauge position. If the problem continues across known material and tooling setups, the machine may require further inspection.
Changes in angle across the length of a component can have several causes, so adjustments should not be made until the source of the problem has been established.
Safety Systems
Press brake safety devices need to remain operational and should never be bypassed to keep a machine running.
The exact safety equipment depends on the machine and installation, but checks may include emergency stops, guards, interlocks, light guards or other protective systems fitted to the machine.
A fault affecting a safety system should be investigated before normal operation continues.
Keep the Machine & Working Area Clean
Metal debris, dust, oil and general contamination can accumulate around a press brake during normal production.
Keeping the machine and surrounding working area clean makes inspection easier and reduces the chance of debris reaching moving components, tooling surfaces or back gauge assemblies.
Cleaning also makes leaks and developing mechanical problems easier to identify during routine checks.
Signs a Press Brake Needs Attention
Changes in machine behaviour should not be ignored, particularly if they occur repeatedly or become progressively worse.
Signs that require investigation can include:
- Unusual noise during operation
- Hydraulic oil leaks
- Repeated CNC alarms or faults
- Inconsistent bending results
- Back gauge positioning problems
- Changes in ram movement
- Damaged or excessively worn tooling
- Problems with guards or safety systems
Continuing to operate a machine with an unresolved fault can turn a relatively straightforward repair into a more significant breakdown.
Planned Servicing & Breakdown Repairs
Routine operator maintenance and planned servicing perform different jobs.
Daily and regular checks help identify visible problems and maintain the machine between services. Planned servicing allows components and systems to be inspected more thoroughly and maintenance to be carried out in accordance with the machine requirements.
A breakdown or recurring fault needs a different approach. The cause should be diagnosed rather than repeatedly resetting the machine or replacing components without establishing why the fault occurred.
If a press brake develops a fault that requires engineering support, see our press brake breakdown repair service.
Press Brake Maintenance Records
Keeping a record of servicing, repairs and recurring faults provides useful information throughout the working life of a press brake.
Records can include service dates, oil and filter changes, replaced components, fault history and work carried out following breakdowns.
This information can help identify recurring problems and provides useful background when an engineer is diagnosing a machine they have not previously worked on.
Maintaining a Press Brake
There is no single maintenance schedule that applies to every press brake. The correct programme depends on the manufacturer, model, drive system, machine configuration and workload.
Following the manufacturer’s maintenance schedule, carrying out regular operator checks and investigating changes in machine behaviour can help identify developing problems before they result in unplanned downtime.
For businesses considering replacing an older machine rather than continuing with repairs, our CNC press brake range includes hydraulic, servo-electric, tandem and automated configurations.
Frequently Asked Questions
How often should a press brake be serviced?
Service intervals depend on the manufacturer, machine model, drive system and operating hours. The maintenance schedule supplied for the individual machine should be followed rather than applying a single service interval to every press brake.
What maintenance does a hydraulic press brake need?
Maintenance can include checks of hydraulic oil, filters, hoses, connections and cylinders together with lubrication, tooling, back gauge components and safety systems. The exact requirements and intervals depend on the machine.
Do servo-electric press brakes need servicing?
Yes. Servo-electric machines do not use a conventional hydraulic bending system, but their mechanical drive, electrical systems, moving components, tooling and safety equipment still require inspection and maintenance.
Why is my press brake producing inconsistent bends?
Inconsistent bending can have several causes, including variations in material, worn or damaged tooling, incorrect tool seating, back gauge problems or issues with the machine itself. The cause should be established before compensating for the problem through repeated programme adjustments.
How should press brake tooling be maintained?
Punches and dies should be kept clean, stored correctly and inspected for wear or damage. Working and clamping surfaces should remain free from contamination, and tooling should not be used beyond its permissible load.
When should a press brake fault be investigated by an engineer?
Recurring alarms, hydraulic leaks, abnormal noise, positioning problems, changes in ram movement, persistent bending inaccuracies or faults affecting safety systems should be investigated rather than repeatedly resetting or continuing to operate the machine.
