Furuno DRS4A Installation Manual page 10

Using inside fixing holes of the sensor housing
This method requires removal of the RF unit from the radar sensor to access inside fixing holes.
Use hex bolts, flat washers, spring washers and nuts (local supply) to mount the radar sensor.
1. Unfasten four bolts from the cover to open the radar sensor.
2. Unplug the PCS connector from RF unit.
3. Separate upper chassis from lower chassis by removing two bolts (M8x25).
4. Remove RF unit by unfastening four hex bolts.
5. Lay the corrosion-proof rubber mat (supplied) on the mounting platform.
6. Fasten the lower chassis to the mounting platform with hex bolts, spring washers, flat washers
and nuts (local supply), and then coat flat washers, nuts and exposed parts of bolts with sili-
cone sealant. Cut a slit in the rubber bushing and insert bolt into the bushing. Do not use seal
washers.
7. Remount RF unit.
8. Apply silicone sealant into four outside fixing holes.
9. Do steps 6-8 in "Using outside fixing holes of radar sensor".
Note: When closing the cover, set the gaskets to grooves in the bottom chassis, then tighten bolts.
Bolt
M8X25,
2 pcs.
PCS connector
Hex bolt
4 pcs.
Upper chassis
RF unit
Lower chassis
6