procedure, comply with all the procedures specified bythe PMS.complete system. Remember that with any electricalproblem, you will need the help of an Electrician’s Mate,who is fully trained for electrical workCONVEYORSThe two types of conveyors the Navy uses forshipboard handling are gravity and powered. Thissection will deal with the general concepts ofmaintaining, troubleshooting, and repairing theconveyors within ship’s force capability. When workingon a conveyor, always follow the manufacturer’smanual or the PMS. For more general informationconcerning conveyors, read NSTM, Chapter 572,“Shipboard Stores and Provision Handling.” Figures8-7, 8-8, and 8-9 are examples of some conveyors theNavy uses.The difficulties most likely to be encounteredduring the operation of powered conveyors are not dueto a malfunctioning of the mechanical equipment, but tothe electrical equipment and the related interlocks. Thefollowing list contains common conveyor troubles thatyou may experience, the probable causes, and remediesfor each of the troubles listed. The cause for improperoperation is best diagnosed with adequate testingequipment and a thorough understanding of theTroubleConveyor willnot start.Conveyor willnot hoist.Conveyor willnot lower.Conveyor runscontinuouslywhen set atINDEX.Probable Cause SolutionPower fails.Determine andcorrect cause ofpower failure.Main line fuse is Replace fuse.blown.Selector switchCheck and resetor switches areselector switches.improperly set.Selector switchCheck and resetor switches areselector switches.improperly set.Loading/unload- Repositioning platform isplatform inset in horizontaleither stowed orposition.decline position.Limit switch isAdjust limitinoperative.switch to actuatewhen bell crankpasses.Figure 8-7.—Gravity conveyor.8-14
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