RITCHIE NAVIGATIONHELMSMAN COMPASS UNITGENERALThe Helmsman series was first manufactured by Ritchie in March, 1981. The series consist of the followingmodels.:HB-70 Bracket Mount - Open Face DialHB-71 Bracket Mount - Direct Reading DialHF-72 Flush Mount - Open Face DialHF-73 Flush Mount - Direct Reading DialHD-74 Deck Mount - Open Face DialHD-75 Deck Mount - Direct Reading DialHV-77 Bulkhead Mount - Direct Reading DialAll models are equipped with 45” lubber lines, night lighting, built-in compensators and are fully gumballed.TROUBLESHOOTINGThere are usually two problem areas to be concerned with when a Helmsman is brought in for repair: A bubble ordial sticking.1.Bubble in fluid: This will probably be the most common problem you will encounter. It can be caused by acracked dome, ruptured diaphragm, defective “O”ring, cover screws not “bottomed” properly or fluid not vacuumed sufficiently. Caution: If watertesting to ascertainpoint of leakage, do not apply more than one pound of air pressure or the diaphragm may be ruptured.2Dial sticking: It is good practice to check the pivot and jewel condition before the compass is disassembledbecause with fluid to dampen the card action, any detect will be easier to see. Allow the dial to completely settle,observe the heading and then deflect the dial two or three degrees with a original position. Failure to do soindicates a defective pivot or jewel, and the entire dial assembly should be replaced (P/N 13J1X or 13J2X).3Discoloration: If the fluid is discolored, the unit should be disassembled and all parts cleaned with fresh compassoil. The dial assembly must be either cleaned or replaced. Be sure to replace both the “O” ring and diaphragm ascontamination in one of these parts caused the discoloration originally.Disassembly: The exploded views that accompany these instructions simplify disassembly. Care should betaken not to disturb the compensators so that any adjustment will remain the same when the unit is returned to thecustomer.NOTESWhen reassembling the compass, be sure the self tapping cover screws anddiaphragm retaining screws are completely "bottomed". On all models except theHIV-77. when replacing the diaphragm retainer, which also contains thecompensators, be sure the compensators are positioned properly. One slotted rodend should be pointing aft and the remaining slotted end should point tostarboard. Also, on all models except the HV-77, be sure to replace the twosunshade retaining nuts under the cover. These nuts arc rectangular in shape andmust be mounted with the long side down.8-1
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