MAINTENANCE engineers partnered with the mine in Minnesota to identify a lubricant solution that would help optimise the performance of the differentials and final drives in the drivetrains of the 226 t payload trucks, particularly in cold temperatures.
The mine site in Minnesota previously lubricated these components with a conventional mineral oil. But, as the fleet evolved to include newer, more advanced Cat haul trucks, the increased horsepower and load of these vehicles caused extra stress on the drivetrain. This meant the lubricant could not protect the equipment as effectively, leading to premature wear and elevated drivetrain temperatures reaching as high as 88 ° C. The team recommended conducting a fuel economy test using Mobil SHC™ 630 in the differential and final drive compartment. The advanced lubricant is specially formulated to provide excellent high temperature thermal / oxidation resistance and low temperature performance, as well as outstanding equipment protection and trouble-free operation.
The operator reported that Mobil SHC™ 630 helped reduce drivetrain operating temperatures and improve fuel economy by 5.5 %. The enhanced protection also helped reduce maintenance, reduce costs and enhance safety by reducing human-machine interaction by 326 hours. These improvements helped generate a company estimated saving of more than $ 2.1 million.
Offline oil filtration for crushers
Sandvik and NCC’ s Ramnaslätt in Sweden recently described their experiences implementing CJC™ Offline Oil Filters on their crushers in the Swedish Aggregates Producers Association publication, Stenkoll. Clean oil in the system reduces wear and tear on machines and increases reliability of service, not to speak of the environmental and financial benefits. Normally, oil is filtered inside machines, regardless of whether crushers or other mining equipment. The flow is constantly high and, because of this, filtration is not always as efficient as desired. And despite different kinds of seals, it is essentially impossible to stop dust from entering systems. One solution is to connect an offline oil filter, which, due to its significantly slower flow, is very effective at cleaning the oil. This kind of oil filter works as a separate ' kidney ' which, in peace and quiet, ensures the best possible quality of the vital oil. There are many different filter solutions on the market: both temporary extra filters, where you connect a removable offline filter which purifies the oil tank during a specific time period – most commonly 24 hours – and permanently connected filters which continuously purify the oil in a machine with a heavy load.
Stenkoll talked to Sandvik, which since 2010 has offered permanent offline filters as an optional extra for its cone crushers, and is planning to introduce the solution as standard.“ Currently, the filter is available as an optional extra and as a ' retro-fit kit ' for our crushers,” says Sandvik’ s Andreas Christoffersson,“ The reason we started offering this was because of an increased focus on reliability, environment and health. In addition, it brings down operating costs.”
He explains that although the crushers have an internal overpressure system, it is difficult to avoid dust getting in, particularly in such a susceptible environment as the extraction industry. Worn‐out dust and sluice seals, and manual handling of oil changes, for example, let undesirable particles in. The oil flows at high speed through the machine’ s internal filter; the entire volume of the tank flows through in many cases in a matter of minutes.
An offline filter is not placed in the main flow, but normally processes the machine’ s oil in a couple of hours. The filtration is finer and the result is a significantly cleaner oil.“ When it comes to cone crushers, we recommend continuous filtration,” says Christoffersson. According to Sandvik, there are several
As an example of component standardisation, conveyors at Loy Yang mine in Victoria, Australia have one drive pulley design and one driven pulley design in use throughout their 2,000 mm wide movable conveyors
advantages of this type of filtration, including: n Less wear on crusher and tank components n Lower oil costs n Less handling of oil, which brings both environmental and health benefits NCC’ s Ramnaslätt plant near Borås is one of the extractors that use the system. In summer 2016 they installed an offline filter on the
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JANUARY 2018 | International Mining 61