The ship's captain complaint of gyro compass keep rotate in clockwise direction. Attend onboard and found as discribed by ship crew. Enter setup access code 610, checked gyrosphere current approx. 265mA and temperature approx. 72deg - very high.
Switch off the gyro compass and waited one hour for gyro sphere to settle. Remove the upper housing and found gyro liquid had evaporated quite a lot so causing the sphere overheat. Another reason for lost of gyro liquid is due to top cover cracked line whereby gyro liquid evaporate through the escaped crack line. After replaced new gyro liquid and enter access code 757 for annual service done, apply epoxy to the crack line and surrounding of the ventilation valve. Wait till epoxy dry, reinstall the gyro sphere back into housing
Started the gyro and observed the gyro sphere current approx. 267mA normal and temperature approx. 50deg, on the high side but still acceptable. Found that closing the front cover will cause the temperature to increase rapidly till 70deg.
Checked and found the fan behind the gyro housing was weak but working. Advice crew to install additional fan to cool the temperature of gyro.
After one month now, no complaint from ship crew so far, so i guess the problem had solved.
Please see attached pictures.
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