Maintenance schedule
| Interval | What to do | Why |
|---|---|---|
| Every shift | Wipe the V opening and punch face | Debris in the V both marks the sheet and shifts the angle |
| Every shift | Check hydraulic oil level | A slowly falling level means a leak; finding it early is far cheaper |
| Every shift | Check e-stop and guarding | Safety, no exceptions |
| Every shift | Listen to the machine on a dry cycle | New noises appear weeks before a failure |
| Every week | Clean back-gauge rails and screws | Dust on the rails means the gauge stops off-position, and the angle follows |
| Every week | Check tooling clamping and coplanarity | Loose or misaligned tooling skews the angle at one end |
| Every week | Drain water and dust from the air filter (if fitted) | |
| Every week | Visually inspect hydraulic fittings | A damp film around a fitting is the earliest sign |
| Every month | Measure oil temperature after 3 hours running | Hot oil makes the angle drift through a shift |
| Every month | Check V-shoulder wear | Shoulders worn to an edge start marking sheet |
| Every month | Run the 3-sample test to verify crowning | See the crowning article |
| Every month | Lubricate per the machine's instructions | |
| Every year | Change hydraulic oil and filters | The most skipped item, and the most expensive one to skip |
| Every year | Full safety-system inspection | |
| Every year | Check ram-to-bed parallelism |
The three things that actually destroy a press brake
1. Hydraulic oil left too long.
Old oil loses viscosity and carries abrasive particles. The consequence is not that the machine stops — it is that valves and pumps wear over months. By the time you notice, you are replacing assemblies, not oil.
Early signs: the angle drifting through a shift, or the machine slowing once the oil is hot. Many shops adjust parameters to compensate for that symptom, which hides the problem until it becomes a real failure.
2. An uncleaned V opening.
Debris trapped in the V does two things at once: it marks the sheet, and it shifts the contact position so the angle is off. Cleaning takes under 2 minutes per shift.
Over time, debris also wears the V shoulders to a sharp edge — and worn tooling is replaced, not repaired.
3. A back gauge running in dust.
The back gauge rails and screws decide part dimensions. Sheet dust on the rails leaves the gauge a few tenths off position. The symptom is flange length that varies part to part, and the operator usually blames the material.
The most commonly misjudged point
Press brake maintenance is not about stopping the machine from breaking. It is about stopping it from drifting.
A press brake rarely fails suddenly. It drifts: the angle creeps, dimensions creep, rework creeps up. Through that period, the money you lose is not in repairs — it is in scrapped blanks and time spent redoing work.
That is why the "every shift" items above matter more than the "every year" items, even though the yearly ones sound more serious.
A simple logbook beats a maintenance contract
Write it down — paper next to the machine is fine:
date · oil / filter change · tooling change · crowning value in use · anything odd heard3 months later that book answers the question nobody can answer without it: "when did this start?"
It helps us too — when you call for support, one line in that book saves a morning of guessing.
Safety
Do not reach into the tooling area with the machine powered. Do not bypass guards or safety sensors "to go faster." Before changing tooling or working in the ram area, cut power and release hydraulic pressure — stopping the program is not enough.
This is the machine that causes the most serious hand injuries in a sheet metal shop. No exception is worth it.