PRODUCTION CASE|LIFT OPERATIONS|WORM GEARBOX
IE A055RESTORATION REPAIR REPORT FOR A GEARBOX
Lift worm gearbox: a worn gear pair returned to service without replacement
Worm pair backlash decreased, pitting and scoring disappeared, gearbox noise decreased. 22.2 % — worm backlash in mesh, 36° → 28° (2003).
PRODUCTXADO technologyrestoration repair performed with the lift in regular service
TREATED UNITSingle-stage worm gearbox of a liftworm — wheel drive; worm wheel rim made of bronze
DOCUMENT TYPEReport of the enterprise
“Kharkov – Lift 4”
“Kharkov – Lift 4”
Key result
↓22.2%
worm backlash in mesh,36° → 28°
| UNIT | CONDITION BEFORE TREATMENT | WHAT WAS MEASURED |
|---|---|---|
| Single-stage worm gearbox of a lift | Wear of the worm — wheel drive 100 %; pitting and cavities on the wheel and the worm | Worm backlash in mesh; condition of the working surfaces |
Worm gear pair: before treatment and after 400 hours of operation
| PARAMETER | BEFORE TREATMENT | AFTER 400 H OF OPERATION |
|---|---|---|
| Worm backlash in mesh | 36° | 28° |
| Working surfaces of the worm wheel rim and the worm | Pitting and cavities | Appearance of a smooth ground surface, cavities and pitting gone |
Measurements were taken by the mechanical service before treatment and after 400 h of lift operation in regular service; surface condition was assessed by visual inspection.
Conclusion of the report
Before the work began, the worm — wheel drive of the worm gearbox had 100 % wear, the worm backlash in mesh was 36°, and there were pitting and cavities on the wheel and the worm. After the restoration repair using XADO technology and 400 hours of operation in regular service, the enterprise recorded in the report: “the worm backlash in mesh became 28°, the working surfaces of the worm wheel rim and of the worm took on the appearance of a smooth ground surface ,i.e. the cavities and pitting disappeared, the noise during gearbox operation decreased”. The bronze rim, which had fully exhausted its service life, stayed in operation: the mesh was restored on a working lift, without replacing the worm gear pair.
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- XADO “Restorative” greaseFriction pairs · joints
How such units are treated:
Limits of this report: The results relate to a single-stage worm gearbox of a lift with a bronze wheel rim, treated with XADO technology under regular operating conditions; under other conditions the figures may differ.