Lubrication Maintenance Guide for Gear Transmission Systems
Provides lubricant selection principles for gear transmission systems, oil change intervals, and oil testing methods to help companies extend gear ser
Oil Change Intervals
Service intervals depend on how the gearbox is run. The table below lists first-fill and regular change periods for three duty profiles.
| Regular Oil Change | Operating Conditions | First Oil Change |
|---|---|---|
| 2000~3000h | Continuous operation | 500h |
| 4000~6000h | Intermittent operation | 1000h |
| 1000~1500h | High temperature/heavy load | 300h |
Routine Maintenance Key Points
A tiered inspection schedule keeps the lubricant and the gear train in serviceable condition:
- Daily checks cover oil level, oil temperature and abnormal noise.
- Weekly checks cover the appearance of an oil sample.
- Monthly checks cover filter status.
- Quarterly checks involve sending oil samples for testing.
- Annually, a comprehensive overhaul is carried out.
Proper lubrication maintenance can extend gear life by 2~3 times.
Lubricating Oil Selection Principles
Viscosity Selection
Viscosity is matched to the gear type and the ambient temperature range in which it operates.
| Recommended Viscosity (ISO VG) | Gear Type | Ambient Temperature |
|---|---|---|
| VG 150~320 | Enclosed gearbox | -10~40°C |
| VG 68~150 | High-speed gearbox | 0~50°C |
| VG 320~680 | Worm gear | -5~40°C |
| VG 1000~1500 | Open gearing | -10~50°C |
Lubricating Oil Types
Four base-oil families cover the usual applications:
| Specification | Detail |
|---|---|
| Mineral oil | general-purpose |
| Synthetic oil (PAO) | high-temperature resistance |
| Polyalkylene glycol (PAG) | suitable for worm gears |
| Extreme pressure (EP) oil | suitable for heavy loads |