Humminbird 997c Combo To mount the transducer pivot assembly to the bracket, Normal Cavitation

To mount the transducer pivot assembly to the bracket:

1.Slide the assembled transducer into the metal bracket from the bottom, aligning the large hole at the top of the bracket with the hole in the pivot.

2.Insert the headed pin through the pivot holes in the bracket and pivot. The headed pin can be inserted from either side of the bracket.

3.Place the nylon washer over the opposite end of the headed pin. Place the stainless washer over the 1/4"-20 x 5/8" (16 mm) screw threads, then insert into the opposite end of the headed pin and finger tighten only. The screw has a thread locking compound on the threads to prevent loosening, and should not be fully tightened until all adjustments are made.

NOTE: The running position of the transducer is now completely adjustable. Subsequent adjustment may be necessary to tweak the installation after high speed testing.

5

12

3

4

1 Screw

2 Headed Pin

3 Allen Wrench

4 Nylon Washer

5 Stainless Washer

To adjust the running position of the transducer:

The transducer mounting bracket allows height and tilt adjustment, while the pivot bolt allows angular adjustment. These adjustments will help reduce cavitation. Initially, adjust the transducer as described in the following paragraphs. Further adjustment may be necessary to refine the installation after high-speed testing.

Normal Cavitation	Cavitation that will cause
	erratic sonar readings

1.First, adjust the pivot angle of the transducer body, so it is parallel with the length of the hull of the boat.

2.Fully tighten the two pivot screws, using the supplied Allen wrench. Access to the pivot screws is provided by the lower holes in the side of the mounting bracket. It may be necessary to re-tighten the pivot bolt after initial use as the plastic may still be conforming to the pressure from the lock washers.

17