OTTO Excavator Spare Parts Sh03-2 4Jb1 Relay 8944501740 894450-1740 8-94450174-0 For Isuzu The OTTO Excavator Spare Parts Sh03-2 4Jb1 Relay with part numbers 8944501740, 894450-1740, and 8-94450174-0 are designed for use with Isuzu engines. This relay is a crucial component in the electrical system of the excavator, facilitating the flow of electricity to various essential parts.