Hitachi C47-WD8000 Service Manual page 211

关于安全的注意事项
部分或涂黑的零件都是在安全上重要的零件。因此更换这些零件时，请参考维修手册。
如使用指定零件以外的零件时，则会降低其安全性，故请使用所规定的零件。
Safety Precaution
The parts with or shade are important safety parts, so, please refer to the "Service Manual" before changing these parts.
If unspecified parts are used, their safety performance will be reduced. Based on that, please use the specified parts.