Steering clutch and engine clutch hydraulic circuit

Claim 1

In a hydraulic control and lubrication system for the power train of a crawler tractor of the type having an engine, an engine clutch, a change-speed transmission including a housing, a final drive including a housing, and a pair of steering cLutches each operated by a hydraulic actuator; said system comprising: an engine driven pump; a control valve for each of said steering clutches including a receiving port, a clutch supply port and an exhaust port; supply conduit means connecting said receiving ports of said valves in fluid receiving relation to said pump; output conduits connecting the clutch supply ports of said valves to said hydraulic actuators, respectively; lubricating passages in said engine clutch; conduit means connecting the exhaust ports of said valves to said lubricating passages; an engine clutch flywheel driven by said engine; a clutch housing secured to said engine in surrounding relation to said engine clutch flywheel including wall means forming a chamber disposed radially outwardly of said flywheel so as to receive fluid thrown from said flywheel by centrifugal force; conduit means connecting said chamber with one of said transmission and final drive housings; and conduit means connecting said pump in fluid receiving relation to one of said housing.