Sulzer improves reliability of mechanical grab
Grab some improved reliability
Prolonging safe operation
Modern, orange peel grabs, commonly operated in waste applications, are essentially self-contained units with an electrical control being the only connection to the operating vehicle. The hydraulic reservoir, cylinders, pump and electric motor are all installed within the frame of the grab, ensuring the process to swap grabs is quick and simple.
Depending on the application, grabs can operate for between 18 months and two years before a service is required. After this time, the tines or petals of the grab will have become worn, and some of the hydraulic circuits may leak. Whatever, the condition of the grab, it is important to complete regular maintenance checks to ensure continued safe and reliable performance.
It is important to identify a maintenance provider that can deliver the necessary services quickly and when they are needed. These pieces of equipment require expert support and specialist parts to ensure a quick turnaround, so some providers will hold spare parts in stock and minimize the time for repair.
Good as new
Installing the new parts, either purchased or manufactured, is just the beginning of a refurbishment; new pivot pins, bushings and seals are used to reattach the petals to the main frame.
The hydraulic cylinders are resealed, having re-chromed the rods if necessary, and comprehensively pressure tested along with the hydraulic power pack, the control valves and the reservoir. Using a hydraulic datalogger it is possible to record pump pressures as well as pressures on both sides of the cylinders and provide the customer with a complete record of the results.
At the same time, new hard-facing is applied to the petals. This cross-hatched welding increases the durability of the steel plates that are required to operate in such arduous conditions. The welding acts as a sacrificial surface that can be replaced during the refurbishment and prevents wear of the base material.
Once all the components have been repaired, they are reassembled, with a new hydraulic filter fitted and clean oil added, it is possible to complete the function testing of the grab and then package it ready for shipment back to the customer. All of this can be achieved in two to three weeks, if parts are already stocked, ensuring the spare grab is back on site and ready to go back to work.
Sulzer offers considerable engineering expertise to many industrial sectors and its service center in York has all the facilities required to deliver a complete grab overhaul efficiently and cost-effectively. This helps plant operators to minimize operating costs and continue to deliver sustainable energy to our homes.