🔍 Key Concepts

• Force-feed lubricating oil system flow path (sump → suction strainer → pump → relief valve/bypass → bearings/other users → drain back to sump) • Relationship between discharge pressure, flow to bearings, and downstream restriction • Purpose and normal operation of a pump relief valve vs a suction strainer

💭 Think About

• If discharge pressure suddenly rises, what does that usually indicate about resistance downstream of the pump? • Which single place in the system, if checked first, will tell you whether the bearings are actually receiving proper flow or being starved? • Between suction side problems and discharge side restrictions, which one is more likely to cause a sudden increase in indicated discharge pressure?

✅ Before You Answer

• Trace the normal flow sequence in a force-feed system and note where pressure is actually sensed. • Decide whether a clogged suction strainer would make pressure go up or down at the discharge gauge. • Consider what you must confirm immediately to protect the bearings from damage when you see an abnormal rise in pressure.