1989/07/24 Caterpillar

Shock Mounts Give Longer Life To 9F3099 Switch Assembly (Starter Relay){1426,1450}

Usage:

3208, 3408B, 3412, 3508, 3512, 3516 Generator Set Engines

Description of Change: The 9F3099 Switch Assembly, or starter relay, on the above generator set engines has been changed from a solid mounting to a shock mounting. This minimizes vibrations to the switch and extends its life.

On the 3208, 3408B, and 3412 Generator Set Engines, the relay itself is now mounted inside the junction box with three screw-type mounts. See Illustration 1. Spacers have been added between the junction box and the engine mounting bracket to allow room for the new screw mounts that extend through the back of the junction bos. See Illustration 2. A new 9Y7376 Enclosure Assembly (junction box) replaced the former 4W7599 Enclosure Assembly.

On 3508, 3512, and 3516 Generator Set Engines, the complete junction box that contains the relay is mounted to the engine with three biscuit-type mounts. See Illustration 4. A new 9Y8474 Enclosure Assembly (junction box) replaced the former 4W7599 Enclosure Assembly.

Adaptable To: The new parts, all used together, can be installed on earlier generator set engines by installing the listed parts. See applicable topic. The former junction box on the 3208, 3408B, and 3412 Generator Set Engines should not be modified because the studs that mount the box to the mounting bracket are not long enough when the new spacers are used.

Installing The Relay Mounts On 3208, 3408B, And 3412 Generator Set Engines

1-9Y7376 Enclosure As. (Junction Box)

3-4B4863 Washer

1-9Y7377 Plate

3-4W3595 Mount-Screw

3-4B2043 Nut

4-3S8536 Spacer

4-5M2894 Washer

1. Remove the junction box and remove the relay and other parts from the box.

2. Install the new relay mounting plate, using the new mounts and hardware, inside the new junction box. See Illustration 1. Fasten the relay to the plate. Reinstall the parts removed from the old box.

Illustration 1. Installing the new parts for 3208, 3408B, and 3412 Generator Set Engines.

3. Install the four new spacers on the mounting studs between the new junction box and the engine mounting bracket, and fasten the new box to the bracket. See Illustration 2.

Illustration 2. Location of spacers now used.

Installing The Junction Box Mounts On 3508, 3512, 3516 Generator Set Engines.

1-7W9033 Bracket As.

4-5M2894 Washer

4-1D4717 Nut

1-9Y8445 Bracket As.

3-9Y9373 Mount

3-9X2079 Screw

3-4B5324 Washer

3-1F2622 Washer

3-4B2041 Nut

12-7K6536 Rivet

1. Remove the junction box. Leave the relay installed in the box.

2. As shown in Illustration 3, drill the holes in the box.

3. Install one new mount through the top of the box, and install two new mounts through the bottom of the box. Use the new parts and assemble them as shown in Illustration 3.

Illustration 3. Locations of the three sets of holes for the new mounts in the former junction box. Dimensions are mm (").