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Page 19 Contractors World - UK & Ireland Vol 1 No 6

“The machine we have been looking at is five years old but that wouldn’t have happened a few years ago. Nowadays, generally speaking, machinery is a lot older. They are running it longer and getng their money’s worth out of machinery.

“The recession has forced people to keep their machines for a longer period of time. What was happening three or four years ago, in our experience, is that a lot of companies were buying machines or leasing one and keeping it for two years and then replacing it. We sell spare parts and what we have found is that it is becoming more common for companies to keep their machine for three or four years now. “Not only that, but because of the exchange rates, a lot of good second-hand machinery is being exported and people are holding onto what is lef and contnually fxing it. It stands to reason that, because people are keeping their machines more, they wear more and these problems are more prevalent.”

The Expander system is a pivot-pin assembly for heavy equipment that is said by its makers to be a far superior way of sortng our issues of wear and tear on worn-out pivots.

Of course, the pivot point is the actve point where the machine delivers its value and when this point wears out, the machine no longer performs the functon it was designed for and needs to be repaired to avoid failure.

The typical way of constructng a pivot-point, in new manufacturing, is to insert a pivot-pin through two lug ears with a bearing housing in between, typically the lugs holes are a few thousands of an inch larger than the pin diameter so the pin can be inserted.

The pin can then be inserted on one side preventng the pin from falling out when wear appears. But because the pin is most ofen a harder material than the lug ears, they begin the wear out therefore enlarging the diameter of the hole. In tme, the lug-holes become so worn that the pivot is no longer stable, begins to break down and becomes a hazard in the working environment.

According to Expander, the orthodox method requires welding and line-boring of the lug hole. This process is costly and tme-consuming, yet only temporary in that wear will occur again. Many customers are in work environments where it is needed several tmes a year.

So how do Expander say their system solves the problem?

In the Expander system, both ends of the pin are tapered and an expansion sleeve is fitted at both ends of the pin followed by a washer and securing element. The assembly is installed in the pivot and the securing elements are tghtened.

As the elements are tghtened, the expansion sleeves are forced over the tapered ends of the pin, creatng a pressure between the pin and the lug-ear, locking the expander system into the pivot. The result? The wear process is permanently eliminated.

The standard sleeves expand up to two millimetres or eight thousands of an inch. Standard oversize sleeves expand up to four millimetres. Plus, a range of specialist over-size sleeves are also available, so on occassions it is not necessary to re-bore the lug-ears.

The key selling point, according to MST, is that the Expander system solves the problem for good. Once the system has been installed the machine is as good or as stable as new.

Rory Whitehall, sales director says, “It is important to find the people who really care about their machines and want to look after them. If they really do care, they should put one of these joints in because it does solve problems on a long-term basis.”

For more informaton: Expander system

MST UK

The Swedish Expander system increases life and reduces servicing costs.

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