Overhaul of Glass Lifting Clamps and Vacuum Lifters

Overhaul of Glass Lifting Clamps and Vacuum Lifters: Like-New Equipment, Safety and Compliance

Glass is a fragile, heavy material: a loss of grip during lifting can shatter the pane and create serious risks for operator safety. A lifting device does not wear out in a linear way. Mechanical glass lifting clamps lose their grip as the cork and contact wood degrade; vacuum lifters lose their seal as gaskets and hoses age.

There comes a point where routine checks are no longer enough and a structural intervention is required. The overhaul of glass lifting clamps and vacuum lifters is exactly that service: a complete intervention that returns the equipment to near-new condition, with safety and working load capacity restored and documented. Because these are lifting accessories, their maintenance is also a legal obligation under applicable workplace safety law (in Italy, Legislative Decree 81/2008).

Overhaul, maintenance and periodic inspection: three different things

These three activities are often confused, but they serve distinct functions. Maintenance is the set of routine checks the operator carries out to keep the equipment efficient day to day. Periodic inspection (thorough examination) is the formal assessment, carried out at a defined interval, that certifies the equipment is fit for use at a precise date.

The overhaul is the deepest intervention: it does not merely inspect — it dismantles, reconditions and replaces degraded components, returning functionally renewed equipment. It is the right choice when accumulated wear makes restoration more cost-effective than full replacement.

Overhauling glass lifting clamps

On glass lifting clamps, the Schiavo overhaul acts on the points that determine grip and safety.

• Cork and wood replacement. The contact elements that ensure adhesion to the pane are subject to compression and wear. They are removed and replaced entirely: this restores grip capacity.
• Overhaul of the movement and locking mechanism. Cams, pins, springs and clamping devices are checked, adjusted or replaced so that locking engages fully and repeatably.
• Structural check. Frame, jaws and mechanical components are inspected for cracks, deformation, corrosion and loose fixings; any damaged component is grounds for replacement, not return to service.

The result is a clamp that, once the overhaul is complete, is as good as new in the parts that matter.

Overhauling vacuum lifters

On vacuum lifters, the focus of the overhaul is the vacuum circuit, because that is where grip and seal integrity are decided.

Suction pads and sealing lips are inspected for cuts, hardening, contamination and wear, then replaced when damaged or worn.

Hoses, fittings and valves. Tubing and quick couplings are checked for leaks, abrasion and tightness; valves, manifolds and fittings in poor condition are replaced.

Vacuum pump and instrumentation. The pump is tested to verify operation and efficiency. Filters and oil are replaced as needed. Vacuum gauges, vacuum switches, indicator lights and audible/visual low-vacuum alarms are all verified.

Every part in poor condition is replaced: the vacuum lifter is restored to deliver the correct level of vacuum once again.

What is checked and replaced: the scope of the overhaul

A complete overhaul follows a structured checklist. In summary, the inspection points are as follows.

• Visual and mechanical integrity: frame, welds, bolts, pins, locking devices; replacement in the presence of cracks, deformation, corrosion or missing fixings.
• Suction pads and gaskets: cleaning of the pads and replacement when damaged or worn. Replacement of gaskets and fittings in the vacuum circuit.
• Vacuum system: pumps, hoses, valves, reservoirs; verification of leaks and correct operation.
• Vacuum seal (leak test): a hold test is performed on the vacuum reservoir to validate the minimum 5-minute autonomy in the absence of main power. Vacuum switches are verified and calibrated to guarantee instantaneous activation of audible and visual alarms within a critical threshold (with replacement of gaskets or non-return valves where leaks are detected).
• Indicators and alarms: low-vacuum indicator lights, audible and visual alarms, and vacuum gauge readings.
• Electrical, battery and charger: connections, switches, state of charge.
• Critical mechanical components: on motorized vacuum lifters that tilt via a trapezoidal screw, the wear-prone bronze nut is replaced.
• Identification and documentation: serial number, safe working load. We issue an inspection or full overhaul certificate to be attached to the user manual.

Compliance and documentation

Glass lifting clamps and vacuum lifters are lifting accessories, and their safety refers to the harmonized standard EN 13155. An overhaul carried out to a professional standard restores not only function, but also compliance. On completion, the equipment returns to service with traceable evidence of what has been replaced and verified.

Safety

The safety of the operators who use this equipment is an absolute priority. Glass is a fragile, heavy material, and a failure of grip during lifting can cause the pane to break and create situations of serious danger to people. For this reason, the overhaul is not only about equipment efficiency — it protects those who use it: by restoring grip capacity, the correct degree of vacuum and the integrity of components, the risk of the load detaching is reduced and safe working conditions are ensured. It is also essential that operators are trained in correct use, inspect the equipment before every use, and respect the safe working load.

In summary

Periodic overhaul of glass lifting clamps and vacuum lifters restores the safety and original load capacity of material-handling lifting systems. Replacing worn vacuum components eliminates risks and potential harm to people and property, and extends the service life of the device. This structural intervention lowers total cost of ownership by extending equipment service life in full regulatory compliance.

Explore the product range for lifting — in particular vacuum lifters and manipulators — or request an overhaul from our technical services, including on multi-brand equipment. For technical updates, subscribe to the Schiavo newsletter.

Written by Giovanni