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Case Study from Sinoserv

Sinoserv just replaced a sealing from a main hydraulic cylinder of a forging press in Anshun, Guizhou province. With technicians, mechanics and specialists Sinoserv executed the job perfectly and in time.


The press owner, a Chinese SOE, manufactures mainly aviation equipment, such as parts for aircraft engines and forgings made of nickel- and titanium-alloy as well as gas turbine forgings and related parts. Their products are successfully marketed and delivered domestically and internationally.

The press manufacturer, a long-term customer of SINOSERV, approached the Engineering team with this project and requested that the sealing replacement must be performed in the shortest possible time, as the press machine was urgently needed for production. One of SINOSERVs’ experienced Supervisor conducted a site visit in advance to evaluate the scope of work and to determine required tools and equipment. After technical clarification and detailed scheduling, the customer decided to award SINOSERV with this challenging project.

SINOSERV deployed nine Technicians, including Supervisors, Mechanics, Electricians and Hydraulic-Specialists to the site. In order to follow the schedule, the work had to happen during weekends, with daily overtime and partly in night-shift as well.

First step was to drain about 2000 l of hydraulic oil and disassemble all hydraulic pipes, valves and aggregates above the hydraulic cylinders’ cover. In order to dismantle the cover, 24 nuts had to be removed from the tie-rods with a special hydraulic tensioning device.

After the dismantling, the cylinders’ cover had to be transported to another supplier for the precise machining of the sealing surface in order to fit for a new and different kind of sealing package.

After the cylinders’ cover came back from the machining supplier, SINOSERV successfully completed the cylinder assembly, including the new sealing package. Subsequently the Technicians had to reassemble the pipes, valves and aggregates on top of the press as well as to refill the hydraulic oil. After everything was carefully reconnected and prepared, the Commissioning-Engineer and Operators were immediately able to start with the recommissioning and testing of the press function.

Another great work done from the Sinoserv Team as always, just the best. 👏👏

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