Humminbird 947C manual To mount the transducer pivot assembly to the bracket, Normal Cavitation

531374-1_A - 947 Man.qxd 2/15/2005 7:53 PM Page 18

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" 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.

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.

1

2

3

4

1Headed Pin

2Nylon Washer (fits over headed pin)

3Stainless Washer (fits over screw threads)

4Screw

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

Normal Cavitation	Cavitation that will cause
	erratic sonar readings

NOTE: Your transducer may not look exactly like the transducer shown in the illustrations, but it will mount in exactly the same way.

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.

3.Adjust the height of the assembly so the face of the transducer is 1/8" (3 mm) to 1/4" (6 mm) beneath the bottom of the transom, and fully tighten the three mounting screws.

4.In order to gain access to the mounting screws, the transducer assembly must be pivoted up in the bracket as shown. Be careful not to alter the running angle as some force is necessary to pivot the assembly.

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