Pneumatic lifting axis: maintenance and inspection
The lifting axis has neither chain nor rope and therefore no discard criteria in the classical sense. That does not make its inspection easier, it shifts it: what matters are seals, guides and whether the load stays put when the compressed air disappears.
- Rule
- DGUV rule 54 (winches, hoisting and traction equipment)
- Interval
- at least annually
- Makes
- any make
An axis without rope or chain – and with one question: what holds when the air goes?
Which rule applies – and at what interval
The lifting axis is hoisting and traction equipment under DGUV rule 54: inspection by a competent person at least once a year, the interval taken from your risk assessment under section 3 of the German Industrial Safety Regulation. The focus differs from chain and rope units: instead of discard criteria on a load-bearing medium it is the safety of the pneumatic circuit that counts. Load holding on pressure loss is not a comfort question here but the safety function of the unit.
- Rule
- DGUV rule 54 (winches, hoisting and traction equipment)
- Minimum interval
- at least annually
- Inspector
- competent person
What we look at on this unit
| Component | Finding | Discard limit |
|---|---|---|
| Cylinder & seals | Internal leakage, creep under load, scoring on the rod | any creep under a standing load |
| Guide | Sliding play, binding, abrasion, contamination | noticeable tilting play at the load attachment |
| Load holding | Check valve, reservoir, behaviour on pressure loss | load must stay put when switched off |
| Service unit | Filter, regulator, condensate | saturated filter, fluctuating pressure |
| Hoses | Chafing points, embrittlement, fittings | any chafing down to the reinforcement |
| End positions & stops | Cushioning, limit switches, mechanical stop | hard impact at the end position |
| Mount & fixing | Column base, rail connection, bolting | any loose bolted connection |
The limits come from the applicable rules. Where manufacturer data exists for the specific unit, it prevails.
What actually gets done
Measure the creep
The axis is stopped with rated load at mid-stroke and observed over a defined period. If it creeps, the internal seal is tired – long before anything shows from outside. The measured distance goes into the report so the next visit sees a trend.
Behaviour on pressure loss
We isolate the circuit with a load attached and check that the axis holds. That is the safety function the check valve exists for – and the point a visual inspection fundamentally cannot cover.
Guide and tilting play
On a linear axis every off-centre load acts as a tilting moment on the guide. We measure the play at the load attachment, because that is where the lever acts, and check the guide for abrasion and contamination – swarf and dust are the most common cause of uneven travel here.
Treat the air
Most pneumatic damage arises not in the unit but in the supply: condensate, saturated filters, fluctuating pressure. We check the service unit and say so when the network rather than the unit is the cause.
When the task has changed
Change the stroke
A different stroke length is needed more often than a different capacity – for instance when a pallet is stacked higher. The work stays confined to the axis as long as the mount carries it.
From mobile to rail
A mobile lifting axis can be hung from a rail system once the workstation has become permanent. That opens up the area and takes stability out of daily operation.
Change the load attachment
Vacuum pad, tongs, mandrel: the workpiece changes more often than the unit. A quick-change system is usually cheaper than a second axis.
What we offer for it
Lifting Equipment Maintenance
Planned maintenance of chain hoists, wire rope hoists, balancers and manipulators – any make.
Lifting Equipment Inspection
Recurring inspection under German BetrSichV and DGUV rules – chain hoists, rope hoists, balancers, manipulators and jib cranes.
Repair & Overhaul
Repair of lifting equipment and manipulators of any make – from a brake change to a full overhaul.
Upgrades & Modification
Adapting existing lifting equipment to a new task – gripper, control, reach, capacity.
Questions on maintenance and inspection
The axis creeps down slowly. Is that normal?
No. Creep under a standing load is always a finding – usually a tired seal or a leaking valve. Nor is it merely a comfort issue: load holding is a safety function and part of the recurring inspection.
What happens on pressure loss?
In a properly built circuit a check valve holds the load until it can be set down. But that has to be explicitly present and tested – it must not be assumed. We test it with a load attached, not on paper.
Do you service lifting axes from other manufacturers?
Yes. Pneumatics follows the same rules everywhere, and the safety-relevant points are the same on every make. Where manufacturer data exists we work to it.
Let’s talk about your equipment.
Tell us which units you have – including ones from different manufacturers. We will come back with a proposal for scope and interval.