SEAL-O-RING 0951624 - Caterpillar

Switch Electrical Specifications
The plating that is on the switch should not corrode and the plating should not oxidize. Gold plated contacts are recommended. All switches should be an environmentally sealed unit. All switches should be protected according to the requirements of the application.Normally, the applied voltage to the switches will not exceed 11.5 Volts. The normal current draw through the switches will not exceed 0.0065 Amp (6.5 mA).The chatter (momentary opening and closing) of the contacts should not exceed a duration of 0.1 seconds (100 milliseconds). The switches should not open and the switches should not close due to a vibration or shock. Closure of an installed switch must short the circuit. The input will short to the "Input Sensor Common 1" (terminal 18) or to the "Input Sensor Common 2" (terminal 3) of the ECM Vehicle Harness Connector J1/P1.Voltage Thresholds (Measurement at the ECM)
Voltage Input of Less Than 0.9 Volts - When the switch contacts close, the voltage that is across the following items must be less than 0.9 Volts between the respective control input and the sensor common connection: difference of the ground potential, drop in switch voltage and drop in voltage for the wiring harness.Voltage Input Equal To or Greater Than 4.0 Volts - When the switch contacts open, the following items must not result in an effective resistance of less than 5,000 Ohms from the respective control input to the sensor common connection: the pin to pin leakage paths in connectors, harnesses and switches.Note: The following terminals are designated as the Sensor Common connection J1/P1: Terminal 3 ("Input Sensor Common 2") and terminal 18 ("Input Sensor Common 1"). OEM installed switches that are input into the ECM must not be connected to the vehicle or to the cab ground. The OEM installed switches must be grounded to the Sensor Common by using a dedicated return line to ECM Vehicle Harness Connector P1.Selecting a Switch Type
The type of switch that is required depends on the type of application that is required. The Cruise Control Set/Resume or the RPM Increase/RPM Decrease Switch is typically a three-position momentary switch. A spring is used in order to return the switch to the OFF position.The PTO On/Off Switch can be an On/Off or a two-position switch. The switch can be actuated by one of the following operations:
Manual
Air
HydraulicThe Interlock Switches for the PTO are typically actuated by air. The Interlock Switches for the PTO are also in the normally closed position. The switches are connected into the air lines for the Parking Brake or connected to the air lines for the Transmission. All switches may be controlled hydraulically or the switches may be limit switches. All switches that are located outside the cab should be environmentally sealed and protected.Switches That Are Available from Caterpillar
A 112-4073 Pressure Switch Assembly is available. The switch has the following features: single pole, single throw and actuated by air.
Illustration 1 g00621900
Schematic for the 112-4073 Pressure Switch Assembly The actuation pressure for the switch is the following