2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 51Get this manual
TECHNICAL FEATURES
AUTOMATIC TRANSMISSION SYSTEM
OUTLINE
This three-speed NT (Automatic Transmission) system controls gear selection by means of the AfT mechanism that consists of the torque converter and the shift clutches (hydraulic clutch)To control the hydraulic clutch and to shift, the system changes the supply of hydraulic pressure to each clutch ttst, 2nd, 3rd) by activating the respective spool valves with the corresponding solenoid valvesEach solenoid valve is controlled by the PCM, that detects the signal from each sensor and switchThe hydraulic oil for this system is the engine oil, which is supplied from the ordinary oil pump for engine lubrication (page