Toro Upgrades Trenchers Toro has upgraded its compact equipment line with the new TRX-16 and TRX-20 walk-behind trenchers, replacing the TRX-15 and TRX-19 models. Along with the Toro TRX-26 model, these gas-powered machines make trenching easier with a tracked design and operator-friendly controls. The 16 hp and 20 hp TRX models are equipped with four-cycle Kawasaki twin-cylinder engines with a large oil reservoir to help maintain low engine temperature and prolong engine life. Delivering 10 GPM of hydraulic flow at 2,900 PSI to the boom helps maximize digging efficiency. Each unit is also equipped with a standard hydraulic oil cooler that provides a cooler running machine in the most demanding conditions.