CT 917A Cooling Tower Gearbox Replacement
The service report for the cooling tower CT 917A documents a controlled gearbox replacement supported by mechanical measurements before and after the work.
Service sequence
- vibration measurement before dismantling;
- drain gearbox oil;
- record motor/gear alignment, coupling gap and shaft-end distance;
- check fan blade angle, tip clearance and tip tracking;
- remove the fan/drive components and replace the gearbox;
- reconnect the drive shaft and align gearbox and motor;
- recheck fan geometry;
- refill gearbox lubricant; and
- repeat vibration testing after installation.
The report photographs show the as-found gearbox condition, removal work, installation, alignment activity and final checks.
Why the baseline matters
A gearbox replacement changes one major component in a mechanical chain. Capturing alignment, coupling geometry and fan settings before removal helps ensure the new reducer is returned to a controlled installation rather than simply bolted into the previous position.
The extracted report text includes vibration measurements before and after, but the reviewed data does not support a clear improvement claim. This draft therefore presents the verified work process and not a numerical vibration-reduction result.