INSTALLATION 2329901 - Caterpillar

Switch (1) is attached to the control handle of the inlet suction line valve for each pump. The valves are located at the hydraulic tank. When the inlet valve of the pump is open the switch is closed. The closed switch grounds the signal circuit. When the inlet valve of the pump is closed, the switch opens the signal circuit. A machine could use multiple pump inlet valve switches that are wired in series. If any of the pump inlet valve switches are open, the VIMS module warns the operator that the inlet valve of the pump is closed. When the switch is tested on the bench, the switch is open. The normally closed contacts are not used in this application.Chip Detector Switch (LHEX)
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Chip Detector Switch (1) Schematic symbol. (2) Switch. During normal operation, switch (2) is open. The switch contacts are magnetic in order to attract metal particles. The switch closes the signal circuit to ground, when enough metal chips cover the switch contacts in order to complete the circuit. The VIMS module warns the operator that chips have been detected when the switch is closed. When the switch is tested on the bench, the switch is open. No metal objects are covering the contacts of the switch. The switch is considered closed, when the resistance is between approximately 0 and 2000 ohms.Steering Flow Switches
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Steering Flow Switches (1) Schematic symbol (2) SwitchDuring normal operation, steering flow switch (2) is closed to ground. The switch opens when the oil flow in the steering system is less than the specified limit. The VIMS module warns the operator that the oil flow of the steering systems is low when the switch is open. Switch (2) is used in the primary steering systems and the supplemental steering systems. When the switch is tested on the bench, the switch is open. Filter Indicator Switches
Plunger Type
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Filter Bypass Switch (1) Switch (2) Schematic symbolFilter bypass switch (1) has a plunger within the switch that closes the contacts with an acceptable pressure drop across the filter. The switch closes the signal circuit to ground during normal operation. When the pressure across the filter is greater than the specified limit the switch plunger moves in order to allow the switch contacts to open. The VIMS module will warn the operator that the filter is restricted when the switch is open. When the switch is tested on the bench, the switch is open.Note: The VIMS module takes the fluid temperature into consideration before warning the operator. Cold fluid has a higher viscosity which causes a higher differential pressure across the filter than fluid at normal operating temperature. When the fluid temperature is below a specified limit, the filter bypass event is ignored by the VIMS module. The temperature inhibit is not used with the fuel filter. Differential Pressure Type
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Differential Pressure Switch (1) Switch (2) Typical schematic symbol (3) Filter inlet port (4) Filter outlet portDifferential pressure switch (1) is activated by a