The Roller That Wore Out in Half the Budgeted Hours A concentrator installed a new set of high pressure grinding roll tyres and budgeted for a service life based on the supplier's datasheet. The tyres came out at roughly half that. Nothing about the tyres w...

The Cheapest Roll Set Cost Twice as Much Per Tonne A mineral processing plant bought a replacement high pressure grinding roll set on price and saved eleven percent on the purchase order. The rolls reached the changeout point in four thousand operating hour...

The Undercarriage That Failed in Half a Season A quarry in West Africa replaced the track shoes on two twenty-ton excavators in the same week, from the same supplier, on the same machine model. One machine ran fourteen months. The other was back on the pads...

The Tooth That Flew Off on Day Two A quarry bought a set of replacement bucket teeth from a dealer who had been supplied a look-alike that matched the part number but not the adapter. It seated, it looked right, and it came off during the second shift when ...

The Hammers That Shattered in Three Shifts A parts dealer supplying a quarry group was asked to quote hammers for a newly installed car shredder. He offered the manganese specification that had performed reliably for years in his customers' crushers, at a g...

A quarry in Brazil fitted a set of low cost jaw plates and lost eleven production hours in the first week. The plates did not wear out. They never seated properly against the crusher frame, the bolt torque relaxed as the machine ran, and the maintenance cr...

The Plate That Cost Eleven Days of Downtime A quarry took delivery of a set of jaw plates, signed the delivery note, and put the set straight into the changeout window. The plates would not seat. Five millimetres of extra thickness across the backing face m...

A Routine Jaw Plate Change Cost Eleven Hours An aggregate plant in West Africa scheduled a jaw plate change for a Saturday shift and budgeted four hours of downtime. The job took eleven. The lifting beam was rated below the plate weight, so the crew improvi...

Nine Production Days Lost Over One Set of Plates A granite plant running 350 tonnes per hour on a primary jaw entered the road-building season with a single jaw plate set in the yard. By late June it was below minimum thickness with nothing on hand. A ...

Two quarries run the same jaw crusher model on similar granite. One changes jaw plates every nine weeks, the other every fourteen. Both buyers believe they negotiated well, because both bought on price per set. Only one of them knows what a ton of crushed ro...