John A. L. Mills & Associates Pty Ltd

Machinery Makers to the Gentry since 1976

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20 Hewitts Road
Carnegie 3163
VIC AU
Tel 0412 426 096
Fax 03 9569 6164

100 Tonne Guide Bush Extraction Tool - ENERPAC

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A high-force tool for removing the Air Bag Suspension Guide Boss found on B Class Tram bogies

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The bosses must be removed for regular maintenance, but this was a difficult prospect as the bosses were frozen in their housings by rust and dust.

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The mating pin and housing are 65 mm diameter.

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The standard operating procedure for removing the bosses was the drill the pin out, a process which could take up to 5 hours.

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As some trams have up to four bogies, this could be incredibly time consuming.

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John Mills & Associates, in consultation with AD Automation and United Group, designed and built this special 100 tonne puller.

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Using special jaws to grip the boss, a bridge joins them to transfer the force of two 50 tonne ENERPAC RCS-502 single acting low height cylinders to react against the housing in the bogie.

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The puller has reduced the process time down to 10 minutes per guide, a massive increase in productivity.