Patent ID: 7261605

Claim:
A trolling device for controlling a clutch oil pressure by rotationally operating a trolling lever, the trolling device having a pressure reducing valve for reducing the clutch oil pressure and a low speed valve for adjusting the spring force of a pilot spring of the pressure reducing valve in conjunction with the trolling lever, the low speed valve comprising a spool connected on the trolling lever unrotatably relative to a lever shaft of the trolling lever and freely slidably along the lever shaft, the spool having one end being in contact with the pilot spring, and the other end receiving primary pressure oil of the pressure reducing valve, a notch groove for discharging the pressure oil into a drain depending on the angle of rotational operation of the trolling lever being formed on a land of the spool, the trolling device being so constituted that forward and reverse clutches are fully engaged by bringing the notch groove into a closed position and a trolling state is attained by bringing the notch groove into an open position, the pressure reducing valve comprising a spool provided with a pilot oil pressure chamber and an orifice formed therein, the pilot oil pressure chamber using the secondary pressure oil of the pressure reducing valve as a pilot pressure and the orifice for draining oil from the pilot oil pressure chamber to a drain, the low speed valve having a protrusion which extends inside a coil spring constituting the pilot spring to the side of the pressure reducing valve and comes into contact with the pressure reducing valve at least when the forward and reverse clutches are fully engaged, the protrusion having a drain oil passage which comes into communication with the orifice when in contact with the pressure reducing valve during trolling to discharge drain oil from the orifice.