Safety first – This is Doppelmayr‘s motto in regard to lubricating systems. In order to exclude right from the start all risks incurred through the possible use of inadequate lubricants, all new systems are filled at the factory, using only selected and internally approved products. Doppelmayr uses only special oils and greases that have been extensively tested and found to deliver optimum results during long-term operation under all possible environmental conditions. Lubricants are also delivered in the original Doppelmayr containers. Clients will recognise the original product by its blue colouring. The operating instructions for each cableway include a list of lubricants that have been approved by Doppelmayr for filling or refilling. In case of using other products, Doppelmayr does not assume any liability in regard to functional safety, and warranty claims will be excluded. Oils used for the brake hydraulics and the cable hydraulic clamping systems are especially thoroughly inspected. The reliability of the hydraulic oils is of paramount importance in this. Brake hydraulics and the emergency drive hydrostat contain up to 200 l of hydraulic fluid. In the past, the system‘s cables were kept under tension using huge weights, nowadays, hydraulic cable tensioning systems that contain up to 450 l of hydraulic oil are used for this purpose. Depending on the system, the tension force can be between 300 and 1,200kN. To prevent too much slip on the cables, a constant base tension is required. However, the cable cannot be overly tight either, since this could potentially cause damage to other system components. The approved long-term synthetic hydraulic oils are especially suited to utilisation across a wide range of temperatures. Selected ingredients improve the ageing properties and increase the corrosion-protection capacity. At the same time, the glide properties and wear protection of the hydraulic components are optimised. In extremely low and/or high temperatures, Doppelmayr uses a partially synthetic fluid with multigrade characteristics.
Shear stable VI (viscosity index) improvers guarantee highly consistent viscosity even during extreme use, such as operation at below freezing temperatures. Condensation and possibly percolated water are precipitated very rapidly and completely, and can thus be drained in the course of a brief standstill without having to replace the entire fill.
Doppelmayr provides a well connected customer service network around the world. Prior to each season, i.e. once or twice a year, a major inspection is performed on each cableway. If this is not possible during the day, the inspections are carried out at night, step by step. The operator can also choose to have their own customer service perform maintenance on the system. For monitoring the greases, gear- and hydraulic oils, as well as to check wear on the components which they lubricate, service technicians recommend the proven lubricant analyses of OELCHECK. The analyses kits are a fixed component in the range of spare parts. In the course of examining the gear- and hydraulic oils, among other things, contamination, e.g. by water or tramp oil, and purity classes are thoroughly checked. Water and an inadequate purity of fluids present the greatest threats to gears and hydraulics. Operators that receive a green symbol on their OELCHECK lab report are given the go-ahead by Doppelmayr to change the oils as needed, no longer on a fixed schedule, but depending on their condition. This reduces the cableway operators‘ cost for lubricants and maintenance.
And Doppelmayr knows: With the OELCHECK lubricant analyses, everyone is on the safe side.