[1][2] Until 1989, the Caterpillar dealership in Western Australia was known as Wigmores, which was also bought by Australian Capital Equity in 1988 and renamed as WesTrac.

Caterpillar began operating in Western Australia in 1925 with a dealership being opened at the South Guildford premises in 1950.

On 22 February 2010, it was announced that WesTrac would merge with Seven West Media to form Seven Network Limited, which is 70% owned by Kerry Stokes.

In mid-2018, WesTrac opened a new 24,000sqm branch at the Crossroads Logistics Centre located in Casula, Sydney (NSW).

It has a 1,500sqm warehouse with a cutting-edge automated inventory system and a drive-through bay for easy parts pick-up.