Disconnect all primary and auxiliary power sources connected to the PS-855B.
The manual begins with stark warnings. Pay attention to:
Reseat all internal data connections; test sensor resistance. Blown primary fuse or disconnected power line.
Ensure power is disconnected before servicing electrical components.
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The PS-855B is a robust, electromechanical pressure switch designed to monitor system pressure and open or close an electrical circuit when a preset pressure point is reached. It is suitable for use with air, hydraulic fluids, oils, and non-corrosive gases.
According to L3 Service Letter SL-170 (Rev. K), the PS-855B requires periodic inspections every 3 to 6 months. These checks are vital to ensure the unit can meet its operational requirements during an emergency.
Internal capacitors and fluid lines can retain high pressure or electrical charge even after power-off. Allow the system to rest for at least 10 minutes before servicing.
Common substitutions from the manual’s appendix: Disconnect all primary and auxiliary power sources connected
This is a helpful guide for locating and using the .
Grand Rapids, MI 49512-9704, USA July 30, 2014. [Link] Foreword. This manual provides information intended for use by persons who, PS-850/855 Battery Maintenance Guide | PDF - Scribd
You can find full component maintenance manuals and service letters through several specialized providers:
The swingo 855B is a commercial ride-on floor scrubber dryer. Manuals for this machine are available for various languages and purposes, including operation, technical maintenance, and economy versions. Blown primary fuse or disconnected power line
Using the ShockBox provides a much more thorough analysis than relying solely on the unit's built-in test, making it essential for diagnosing marginal or failing batteries.
The following document is a prepared for a generic industrial PS-855B Pressure Switch. If your device is a different type of equipment (e.g., a power supply, hydraulic pump, or audio component), please provide more details so the specifications can be adjusted.
Overheating is a primary cause of premature component failure in the PS-855B.
For deeper diagnostics, the L3Harris PS-855B maintenance manual may reference the "ShockBox BFG Capacitance Test Box" (Part #: SB24-03-835). This manually operated test unit is designed specifically for the PS-835, PS-850, and PS-855 series. It allows a technician to apply a precise load to the battery and verify its capacity against the parameters in the manual.
The output voltage must be monitored using a Digital Voltmeter (DVM).
The PS-855B uses low-maintenance lead-acid batteries. However, regular inspections are critical for flight safety. According to L3 Service Letter , the condition of the batteries must be checked every 3 to 6 months using the Periodic Check procedure outlined in the bulletin.