Furuno FR-2155 manual Scanner unit assembling, Apply silicone sealant here Ring Choke groove

Scanner unit assembling

The scanner radiator and the scanner housing are shipped in separate packages and must be assembled at installation. Assemble them as below. Refer to the scanner unit assembling drawing at the back of this manual for details.

1.Remove two protective caps from the radiator flange and rotary joint flange.

2.Grease an O-ring and place it in the groove of the rotary joint flange. Make sure the O-ring is not pinched during assembling.

3.Secure the feeder waveguide to the rotary joint flange with four M6x16 hex bolts.

4.Fix the feeder waveguide on the radiator joint with four M4x16 washer head bolts. Coat waveguide flange with silicone sealant as illustrated below.

Apply silicone sealant here.

O-ring

Choke groove

O-ring

Apply silicone sealant here.

Evenly coat the waveguide flange with silicone sealant. Apply sealant sparingly; it leaks out slightly when the fixing bolts are tightened. Be sure no sealant contacts the choke groove and waveguide.

Figure 1-2 How to coat waveguide flange with silicone sealant

5.Loosely fix the radiator to the radiator bracket with M8x25 and M8x30 hex head bolts, M8 flat washers, M8 spring washers, and M8 hex nuts.

6.Grease the other O-ring and place it in the groove of the radiator flange. Secure the feeder waveguide to the radiator flange with M4x16 washer head bolts.

7.Fix the feeder waveguide to the bottom of the radiator with the waveguide clamp, waveguide packing, M4x30 hex head bolts, M4 flat washers, and M4 spring washers.

8.Tighten bolts loosely fixed at step 5.

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