A machine that has been cut, welded, straightened or altered is not the same machine the manufacturer built and had approved. Whenever a structural repair or a modification touches an elevating work platform, it opens a question that has to be answered before anyone stands in the basket again: is the machine still as safe as it was designed to be? Re-inspection is how that question gets answered properly, with testing and engineering judgement rather than optimism. This guide explains why repairs and modifications trigger a fresh assessment, what engineering sign-off adds, and why the paperwork it leaves behind matters for the rest of the machine's life.
Why altered structure needs re-checking
An access machine's structure is engineered as a system. The boom, the pivots, the chassis and the platform are designed to carry load and resist fatigue in a balanced way, and that balance depends on the metal being in the condition the designer assumed. Cut into it, add to it, or repair a crack, and you have changed one part of a carefully engineered whole.
That is why a structural repair is not finished when the welding stops. The work needs to be verified — that the repair itself is sound, and that it has not shifted stress into a neighbouring part of the structure in a way that stores up a future failure. Re-inspection is the step that confirms the machine as repaired still behaves the way the machine as designed was meant to.
Repairs versus modifications
It helps to separate two things that both trigger re-inspection but for slightly different reasons.
- A repair restores the machine to its original specification — replacing a cracked member, renewing a worn pin, re-welding a damaged joint back to how it was built.
- A modification changes the machine from its original specification — altering the platform, adding an attachment, changing how a load is carried or how the structure is loaded.
- A repair has to be verified as sound; a modification has to be verified as a change the design can actually tolerate, which is a bigger question and usually a bigger engineering exercise.
What triggers a fresh inspection
Not every spanner turned on a machine demands a full re-inspection, but structural and safety-critical work does. The threshold is whether the work could affect the integrity of the structure or the behaviour of a critical component.
Work that typically calls for re-inspection before return to service includes:
- Any welding on structural members, lugs, the boom or the turntable, whether repairing damage or a crack.
- Straightening or reforming a bent or deformed structural element.
- Replacing or repairing a critical component such as a slew ring, cylinder, pin or locking device.
- Fitting a modification, attachment or altered platform that changes how the structure is loaded.
- Repairing damage from an overload, collision or tip-over event that may have stressed more than the visibly damaged part.
The role of engineering sign-off
Structural repairs and modifications are engineering matters, and the assessment that clears them back into service is the work of a competent person with the right qualifications. Their role is not merely to look at the finished weld but to judge whether the repair or change is fit for purpose against the machine's design and the applicable standards.
For a modification in particular, that judgement can extend to calculation — confirming the altered machine still meets the strength and stability the original design guaranteed, and setting any new limits that follow. The sign-off is the point at which a qualified person takes professional responsibility for the statement that the machine is safe to use as repaired or modified.
Testing that backs the assessment
Engineering sign-off rests on evidence, and the usual evidence for structural work is non-destructive testing of the repaired welds and members. Methods such as magnetic particle testing on surface and near-surface cracks, or ultrasonic testing into thicker sections, confirm the repair is free of the defects that would let it fail early.
Function and, where appropriate, load-related testing then confirm the machine as a whole still operates and holds as it should through its full range of motion. Only once both the localised testing and the whole-machine checks are satisfied does the assessment become a genuine clearance rather than a hopeful one.
The documentation it leaves behind
The lasting value of a properly handled repair or modification is the record it generates. The re-inspection produces documentation describing the work, the testing carried out, the results and the engineering sign-off, and that record goes into the machine's logbook as a permanent entry.
That entry does real work for years afterwards. A future inspector reads it to understand why there is a repair in the structure and to satisfy themselves it was done properly; a future buyer reads it as reassurance that past damage was addressed to a standard rather than patched. A repair with no paperwork looks to both of them like a liability, however good the welding actually was. To have a structural repair or modification inspected, tested and documented for the logbook, phone EWP Australia on 0416 689 689.
This guide is general information prepared by EWP Australia and is grounded in publicly available Australian Standards and Safe Work Australia material. It is not a substitute for the current published edition of the relevant standard or for site-specific engineering advice. Always work from the current standard and consult a competent person for your specific equipment and application.