2001-2003 Honda TRX500FA Factory Service Manual, Page 396Get this manual
TECHNICAL FEATURES When the mo tor-sid sw ash late is perpendicu lar to the pump axis, the ist ons do not stroke (therefo re, oil is not discharged)In this conditio n, oi cannot fl ow between the pump and the moto rand he pump swash plate assembly and ou tput shaft are hydraulica ly locked (1:1 gear rat ioto rotates them ogether as one bod yAn Overdrive is achie ved by adjusting the swash plate to an angle beyond perpendicula rity to the pump all isAs the pistons begin thei travel back up the motor-side swash pl atethey begin their ischarge strokeTh hydraulic fl uid is transferred back th rou the motor-side dis tribu to valve and into the tow-pressure circuit of the bodyThe fluid the passes through the pump-side distributor valve, where it is timed to th suct ion stroke of the um pistons