Place O-ring (b) on speed sensor (a).
Slip speed sensor (a) cautiously into the axle box cover so as not to damage the sensing device.
Tighten machine screws (c) to the torque value stated in installation directive B77942 and in the installation drawing of the unit.
Open the screw plug on the axle box cover, and make sure that the spacing between speed sensor (a) and the teeth of the rotating gear (reference size h) (see Figure 2) matches the value
stated in installation directive B77942.
Correct inadequate spacing by inserting flange plates. The flange plates are available in a number of thicknesses (see Figure 3)