Patent ID: 9631378
Date: 2017-04-25
CPC Classifications: E04F

Claim:
1. A concrete finishing trowel comprising: a frame; at least first and second rotor assemblies extending downwardly from the frame, each of the rotor assemblies having a shaft that supports a plurality of blades; an engine; and a hydraulic circuit including a reservoir and a hydrostatic drive system that is coupled to the engine, to the rotor assemblies, and to the reservoir, the hydrostatic drive system comprising including the hydraulic circuit further comprises first and second coolers that cool hydraulic fluid flowing through the hydrostatic drive system, wherein the first cooler is a closed loop cooler located in a flow path connecting an outlet of the motor to an inlet of the drive pump, and the second cooler is an open loop cooler in a flow path connecting the hydrostatic drive system to the reservoir.