Furuno DRS4A Installation Manual page 13

4. Pass flat washers (M12, supplied), spring washers (M12, supplied) and nuts (M12, supplied)
onto hex. bolts. Fasten by tightening nuts. Do not fasten by tightening the hex. bolts; seal
washers may be damaged.
5. Coat flat washers, spring washers, nuts and exposed parts of bolts with anticorrosive sealant.
6. Prepare ground point in mounting platform (within 300 mm of ground terminal on radar sen-
sor) using M6 x 25 bolt, nut and flat washer (supplied).
7. Run the ground wire (RW-4747, 340 mm, supplied) between the ground terminal and ground
point.
8. Coat ground terminal and ground point with silicone sealant as shown below.
Seal washer
Rubber mat
Flat washer
Ground
wire
Silicone
OR
sealant
Ground
wire
Weld here.
GROUND
TERMINAL
Antenna
unit
Mounting
platform
Silicone
sealant
Hex. bolt
Flat washer
Flat washer
Spring washer
Hex. nut
GROUND
POINT
Hex. nut
Spring washer
Flat washer
Hex. nut
Silicone
sealant
Ground
wire
antenna
unit
6