变速箱机油油面表
transmission oil level gauge
变速箱机油油面表总成
transmission oil level gauge assembly
柴油机机油冷却器
diesel oil cooler
lube oil cooler for diesel engine
低机油油面警报器开关
low oil level alarm switch
低机油油面信号器
low oil level annunciator
发动机机油油槽区
engine oil sump compartment
发动机机油油路简图
engine oil flow schematic