Humminbird 937C DF COMBO, 937C COMBO Speed Accessory Installation, Install the Speed accessory

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SPEED ACCESSORY INSTALLATION

NOTE: You will only need to perform this procedure if you have a Speed-Only Sensor.

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The Speed accessory incorporates a paddlewheel-type speed sensor in a high-impact plastic housing. The module is intended for installation on the transom, and will work well on almost any boat.

In addition to the parts supplied, you will need a hand drill with various bits, marine- grade silicone sealant, and a Phillips head screwdriver.

Install the Speed accessory:

1. Locate an area on the transom of your boat that will be 6” to 8” or farther from

the transducer(s). This area must also maintain contact with the water, even at

high speeds. Do not mount the accessory directly in front of the propeller or

outdrive, and make sure that there are no protrusions such as ribs, rows of

rivets, or transducers directly forward of the mounting location, as these may

affect the flow of water over the paddlewheel.

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1 Escutcheon Plate 6

2Wood Screw and Washer

3Cable Clamp

4Axial Clip

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5Wedge

6Paddlewheel

7Speed Accessory

2.	Align the accessory on the transom so that the lower edge is flush with the hull
	of the boat and the tab on the bottom of the housing aligns with the bottom of
	the hull, and mark the hole locations. If the transom angle is excessive, a fairing
	block may be needed to level the paddlewheel for proper operation.
3.	On fiberglass hulls, it is best to start with a smaller drill bit and use progressively
	larger bits to reduce the chance of chipping or flaking the outer coating. Drill
	two 9/64” (3.5 mm) mounting holes approximately 3/4” (19 mm) deep.
4. Seal the mounting holes with marine-grade silicone sealant, and attach the
	module to the transom using the two washers and two screws provided.

Hand tighten only!

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