Minimizing production shortfalls and lowering the life cycle cost of the machinery and equipment is a constant challenge for the service and maintenance crew.

The useful life of the conventional pins in the stabilizer linkage on CAT’s 793B fleet was calculated to be 5,000 hrs. The machine was then brought in for disassembly, line-boring and re-pinning as part of crew’s maintenance schedule.

In 2003 the decision was made to put Expander System to the test.

A mining truck was fitted with pivot pins from Expander System and they outlasted the conventional solution by four times. The Expander pivot pins were checked every 5,000 hours and were not replaced until the 20,000 hour maintenance check. During the replacement no line-boring was needed and the whole procedure was completed in a few hours instead of days as it would in case of the conventional solution.

The cost savings where Expander pins were fitted were calculated to be over $30,000. While the test was ongoing and proven successful, the Yanacocha Mine maintenance department decided to start using the Expander System in many other pivot applications on their haul truck fleet.

The Yanacocha Mine is also using the Expander System on several vital wear points on Motor Graders and Wheel Loaders.

Expander pivot pins are suitable to fix excessive wear on these positions

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