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 TM 55-1905-219-14-11
5-117. SHIP' COURSE INDICATOR - MAINTENANCE INSTRUCTION (Continued).
S
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - DISASSEMBLY (Cont)
NOTE
pins. The gear shafts are shimmed for end play and held in place with
retaining rings.
When disassembling the gear train, to avoid damaging the bearings, remove
the gear along with its gear shaft and then drive the spring pin from the gear
to remove the gear from the shaft.
If a shaft is pinned at both ends such that a pin must be driven out while the
shaft is inserted through its bearings, back the gear with a piece of hard
wood or soft aluminum while the pin is being removed.
When replacing any gear, if the old shaft is retained the gear and shaft
should be assembled and drilled for the appropriate size pin. Turn the shaft
so that the new hole is drilled through the shaft approximately perpendicular
to the original hole. If the shaft has been previously redrilled, discard it and
replace it with a new one.
To gain access to the gear train for disassembly, remove the servo and dial
assembly from the SCI. Remove all servo amplifier leads from the
synchros and servomotor and tag for replacement. Remove the five
screws which attach the servo amplifier to servo and dial assembly and
remove the amplifier.
When disassembling the gear train, tag all shims and spacers so they may
be replaced on the proper end of the shaft from which they were removed.
These spacers are selected to adjust shaft end play to prevent excessive
gear backlash or bearing preloading.
5-1321
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