https://peertube.dngr.us/videos/watch/46ff0ef1-5c3c-45df-90ed-a46b9eac0f4c Join this channel to get access to perks: https://www.youtube.com/channel/UCddem5RlB3bQe99wyY49g0g/join Want to learn more about Periscope Film and get access to exclusive swag? Join us on Patreon. Visit https://www.patreon.com/PeriscopeFilm Visit our website www.PeriscopeFilm.com “Ships’ Controllable Pitch Propellers: Maintenance, MSO Control, and Servo System” is a b&w training film made for the U.S. Navy by Wilding Inc. This film details how to maintain and troubleshoot issues that occur with the controllable pitch propeller systems in place on aggressive-class minesweepers/ MSO (Mine Sweeper Ocean) used to clear naval mines. The film examines the four basic symptoms that indicate maintenance is required on the control and servo system. Minesweeper USS Nimble (MSO 459) (0:40). Illustrated diagram of controllable pitch propeller system: Controls, servo system, and propeller assembly (0:50). Illustration of two types of controls: Electro-hydraulic, electromechanical, associated propeller servo system (1:08). Electro-hydraulic controls, manufactured by Norfolk Naval Shipyard and Farrel-Birmingham Company; Schematic depicts electro-hydraulic control system and how to operate it (1:21). Signaling propeller pitch change using pilot house console toggle - forward for head pitch, back for astern pitch (2:04). Control unit: Hydraulic cylinder with differential area piston; Illustration of what happens to control unit during head, astern pitches, oil flow and pressure causes piston and servo system to move (2:26). Controllable pitch propeller (CPP) blade moving (3:20). Solenoid Valves: Manual operation feature, emergency control panel with manually operated valves (3:36). First indicator of need for maintenance troubleshooting: Lack of propeller pitch change in response to signal, interior of electric system, hands wind open closed valve as part of hydraulic system, hands use screwdriver to investigate toggle switch (4:09). Detecting burned out solenoid valve: Officer first tries to listen to valve then checks lead wires for power with test light (4:30). Second symptom requiring maintenance troubleshooting: Drifting propeller pitch, officer first examines forward end of pitch control unit for oil leaks; officer hand covered in oil after touching follow-up rod O-ring, runs hands along runs along all joints and fittings in control circuit piping, panel display of needle and solenoid valves (4:55). Solenoid valve, examination of head manual needle valve (6:14). Disassembled pitch control unit, cylinder liner (7:08). Disassembled pitch control unit piston (7:41). Arrow moves along screen of remote electrical indicator (7:51). General causes for synchro failure (8:02). Electromechanical controls: Manufactured by American Engineering Co. & Control Engineering Co.; Illustrated schematic depicts electromechanical control system and how it operates (8:13). Signaling propeller pitch change using pilot house console toggle - proper motor contacts activate, magnet released, reversible shifting motor turns causing servo motor to position blades (8:36). Indications for troubleshooting electromechanical controls: Lack of response to propeller pitch change order, defective motor starter, blades in astern pitch without order (9:53). Lack of movement on remote electrical indicators: Defective synchros or mechanical wiring (11:12). Close-up image of faulty oil supply tube (11:30). Servo system used by both Electro-hydraulic, electromechanical systems: Illustrated schematic depicts servo motor and other associated components that make up the system i.e. oil injector, filters, relief valve, pumps, strainer, hydraulic tank, connecting pipelines (11:54). Servo motor, use of high pressure hydraulic oil to move piston, control blade pitch (12:27). Two types of injectors used in servo system: Electro-hydraulic vs. electromechanical (13:51-15:23). Vickers constant pressure variable delivery pump supplies high pressure oil to injector (15:24). Image comparing pump operating at short vs. long stroke (15:45). Indications for troubleshooting servo system: Slow response to ordered propeller pitch change, officer checks oil temperature, listens for sound of cavitation within pump (16:10). Close-up oil supply tank, use of stroke limit pump to measure stroke (16:57). Micronic full flow oil filters at discharge line of hydraulic pumps (17:13). Internal leakage in servo motor (17:23). Inspection of worn V packings, scoring of valve stem (18:00). Officer checks pump compensator control, removes and cleans it; Checks valves (18:19). Propeller hub (18:55). Summary of film (19:24). Minesweeper USS Pinnacle (MSO-462) (20:10). Film ends (20:24). This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com Source: https://www.youtube.com/watch?v=5-FKXuboTCA Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 13:19:50 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/46ff0ef1-5c3c-45df-90ed-a46b9eac0f4c All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.