Usage:
Both of these normally-open push button switch assemblies have many uses which include: hydraulic excavator travel timer alarm reset, ether aid actuation, and engine start/engine stop. The earlier versions of the 3F1006 and 3D9718 Switch Assemblies were identical except for the size of their screw terminals. The 3F1006 Switch Assembly used size 10 screws, while the 3D9718 Switch Assembly used size 8 screws. Under certain conditions, moisture could enter the switch contact area past the sealing boot and cause open contacts in both switch assemblies.
Previously, neither switch assembly contained a manufacture's date code stamp. However, as of the 23rd week of 1991 (date code "231"), the date code has been stamped on the side of the improved 3D9718 Switch Assembly housing. Also, the color of the protective boot has been changed from black to gray. The gray boot has improved low temperature performance to prevent the switch from "sticking", and has an internal thread seal to help keep moisture from entering the switch contact compartment.
Effective immediately, the improved 3D9718 Switch Assembly will service all applications for both of the earlier versions of the switch assemblies. To make sure that a moisture resistant installation is made, correct assembly is important.
Procedure To Correctly Assemble A New 3D9718 Switch Assembly And Provide A Moisture Resistant Installation
1. Remove the protective boot from the switch.
2. If two locknuts are present, remove and discard one. Position the remaining locknut against the housing at the switch-end of the threaded bushing.
3. Install the switch from the back side of the panel.
4. Install the protective boot until a gentle resistance is felt as the internal thread seal contacts the face of the threaded bushing.
5. Finger tighten the protective boot another 1/4 to 1/2 turn.
6. Tighten the locknut on the back side of the panel to a torque of 18 ± 2 N·m (13 ± 1 lb ft).
7. Connect the appropriate wiring.