IE B003THREE TEST REPORTS · 28.11.2003 — 03.02.2004
Bogdan A091 final drives: noise cut without teardown, effect holds with mileage
Final drive gearboxes ran quieter across all measurement modes, the effect held after route operation. 7–9 dB — final drive noise under load, 102–105 → 93–98 dB (2003–2004).
for gearboxes and final drivesVERYLUBE for gearboxes and final drives · added to final drive oil, 3–6 %
by a commission of three organisationssigned by representatives of SE Bogdan Servis, XADO and East Consult Trading
Key result
| BOGDAN A091 BUS | MILEAGE AT START | REPORT | FINAL DRIVE NOISE MEASUREMENTS |
|---|---|---|---|
| Body 001006, new | 242 km | 28.11.2003 | Before treatment |
| Reg. No. 012-74KA | 16 588 km | 28.11.2003, 16.12.2003 | Before treatment |
| Reg. No. 004-60KA | 11 879 km | 28.11.2003 | Before treatment |
| Reg. No. 033-29KA | 7 687 km | 28.11.2003 | Before treatment |
| Reg. No. 013-94KN | 29 818 km | 16.12.2003, 03.02.2004 | Before treatment, after treatment and after 14 528 km of mileage |
| Reg. No. 014-15KA | 14 101 km | 16.12.2003, 03.02.2004 | Before treatment, after treatment and after 13 656 km of mileage |
Final drive noise: before treatment, after treatment and after mileage
| BUS | MEASUREMENT MODE | BEFORE, dB | AFTER TREATMENT, dB | AFTER MILEAGE, dB | CHANGE, dB |
|---|---|---|---|---|---|
| Reg. No. 013-94KN | Wheels raised, 40 km/h equivalent | 91 | 89 | 84 | −7 |
| Reg. No. 013-94KN | Wheels raised, 60 km/h equivalent | 99 | 96 | 90 | −9 |
| Reg. No. 013-94KN | Under load, 80 km/h equivalent | 105 | 102 | 98 | −7 |
| Reg. No. 013-94KN | Coast-down, engine off, from 80 km/h | 101 | 95 | 94 | −7 |
| Reg. No. 014-15KA | Wheels raised, 40 km/h equivalent | 88 | 83 | 81.5 | −6.5 |
| Reg. No. 014-15KA | Wheels raised, 60 km/h equivalent | 94 | 87 | 85 | −9 |
| Reg. No. 014-15KA | Under load, 80 km/h equivalent | 102 | 95 | 93 | −9 |
| Reg. No. 014-15KA | Coast-down, engine off, from 80 km/h | 95 | 92 | 93 | −2 |
Sound level meter model 0024, serial No. 31192, calibration 04.2003. Follow-up measurement — after 14 528 km (013-94KN) and 13 656 km (014-15KA) of scheduled route service.
Commission conclusion
Current equivalent
Revitalizant gel for gearboxes →
Industrial gearboxes, final and central drives, truck and tractor gearboxes, open gear and chain drives.
How such units are treated:
Limits of this report: The results refer to the final drive units of Bogdan A091 buses in city service; on other equipment and under other measurement modes the figures may differ.