English to Russian Tech/Engineering Engineering (general)

Operating and Maintenance Instructions Fiberline/Airlock Screw Feeder
...

Assembly:
Assembly is the reverse of disassembly with a few special precautions.
1. As with disassembly, care should be taken not to damage the flights while inserting the conveyor as-sembly into the housing. Check for any debris left over from the inspection and remove it before in-stalling the conveyor.
2. The drive side should be assembled first. Before installing the end cover, position the conveyor as-sembly so that the edge of the conveyor pipe body has the correct clearance to the edge of the housing.
3. Place all the bearing elements on the shaft, but do not position or tighten the bearings until the bot-tom bearing housing has been positioned on the end cover and the bolts tightened.
4. Leave the packing out when installing the end covers. If the ***packing gland and packing box are not split, don’t forget to install them before the bearing is installed.

Как дифференцировать packing gland и packing box, если во многих словарях они переводятся идентично?

Спасибо.