IE A066GEARBOX TREATMENT REPORT UNDER XADO TECHNOLOGY
MChT-125 machine gearbox: metal grew on the teeth, bearing clearances shrank
Metal built up on the teeth of both stages, clearances in the bearings decreased, the mesh tightened up. 0.05–0.15 mm — tooth thickness on the gears of both stages, 5.1–9.7 → 5.2–9.8 mm; 20–30 % — radial clearance of the bearing supports, 0.10–1.15 → 0.08–0.90 mm; 3.95 % — working backlash in the mesh, 1.77 → 1.70 mm (2002).
of the MChT-125 machinedrive pinion and driven gears of both stages · six bearing supports
dated 02.08.2002four signatories, approved by the chief engineer of the plant
Key results
| EQUIPMENT | CONDITION BEFORE TREATMENT | WHAT WAS MEASURED |
|---|---|---|
| MChT-125 machine, gearbox gear train | As assessed in the report — wear above 100%; deep pits and fine scoring on the working surfaces of the teeth | Tooth thickness on the drive pinion and two driven gears, working backlash in the mesh |
| Bearing supports of the same gearbox | Radial clearance of the right support of the angular-contact ball bearing — 1.15 mm | Radial clearance of six supports: angular-contact ball, double-row spherical roller, angular-contact |
Tooth thickness before and after treatment, mm
| UNIT AND MEASUREMENT HEIGHT | BEFORE | AFTER | GAIN |
|---|---|---|---|
| Stage 1, driven gear (h = 4 mm) | 5.10–5.15 | 5.20–5.25 | 0.10–0.15 |
| Stage 2, drive pinion (h = 5 mm) | 7.20–7.40 | 7.35–7.45 | 0.05–0.15 |
| Stage 2, drive pinion (h = 9 mm) | 9.55–9.70 | 9.60–9.75 | 0.05 |
| Stage 2, driven gear (h = 5 mm) | 7.40–7.85 | 7.55–7.85 | 0–0.15 |
| Stage 2, driven gear (h = 9 mm) | 9.70 | 9.70–9.80 | 0–0.10 |
At each mark on the gear three consecutive teeth were measured — 36 points in all; a gain of metal was recorded at 32 of them.
Clearances in the mesh and in the bearing supports, mm
| MEASUREMENT | BEFORE | AFTER | CHANGE |
|---|---|---|---|
| Working backlash between the teeth | 1.77 | 1.70 | −0.07 |
| Angular-contact ball bearing, right support | 1.15 | 0.90 | −0.25 |
| Angular-contact bearing, left support | 0.20 | 0.14 | −0.06 |
| Double-row spherical roller bearing, right support | 0.10 | 0.08 | −0.02 |
| Angular-contact ball bearing, left support | 0.09 | 0.08 | −0.01 |
| Angular-contact bearing, right support | 0.08 | 0.07 | −0.01 |
| Double-row spherical roller bearing, left support | 0.02 | 0.02 | 0 |
The most worn is the right support of the angular-contact ball bearing — 1.15 mm before treatment; the relative change given in the header covers the three supports with the largest clearance.
Conclusion of the report
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
How such units are treated:
About this result:
Limits of this report: The results refer to the two-stage gearbox of the MChT-125 machine under the conditions of Dneproshina OJSC; with a different unit condition and operating mode the figures may differ. The treatment and the measurements were carried out jointly by Dneproshina OJSC and XADO LLC.