Purpose
The article addresses the issue of gear cracking observed in the KUCA and LUCA series compressor units used in VRF systems, and provides guidance for diagnosis and resolution of this fault. Fujitsu General Australia
Scope & Applicability
Applies specifically to the KUCA / LUCA models .
Intended for service technicians, installers and maintenance personnel working with these units.
Focused on identifying and responding to gear-cracking symptoms rather than routine service issues.
Key Diagnosis Findings
Gear cracking is caused by mechanical stress and wear conditions within the gear train.
Symptoms include unusual noise, abnormal vibration, and potential failure of the louver to engage correctly.
The fault may not be immediately visible externally; internal inspection or performance analysis is often required.
Recommended Actions
Inspect the affected compressor’s gear mechanism for cracking, worn teeth, or damage.
If gear cracking is confirmed, replace the gear train in accordance with Fujitsu’s service guidelines.
