When is the pre-lubrication pump used in the BEAR Power Unit?

When is the pre-lubrication pump used in the BEAR Power Unit?

• A. During shutdown
• B. During idle
• C. During full load
• D. During startup

Answer: (D)

Starting the BEAR Power Unit is when the pre-lubrication pump does its job. Its purpose is to prime the lubrication system before the engine actually turns over, filling oil galleries and bearings so oil pressure is already established as soon as the main pump starts. This quick, initial lubrication minimizes metal-to-metal wear during the critical first moments of startup and helps prevent bearing damage from dry starts. So the pump is used during startup to prepare the system, not during shutdown, idle, or while running at full load, since those phases rely on the ongoing lubrication provided by the main system rather than priming before start.

Starting the BEAR Power Unit is when the pre-lubrication pump does its job. Its purpose is to prime the lubrication system before the engine actually turns over, filling oil galleries and bearings so oil pressure is already established as soon as the main pump starts. This quick, initial lubrication minimizes metal-to-metal wear during the critical first moments of startup and helps prevent bearing damage from dry starts. So the pump is used during startup to prepare the system, not during shutdown, idle, or while running at full load, since those phases rely on the ongoing lubrication provided by the main system rather than priming before start.