Fault Phenomenon: Haulotte HA12SP articulating boom aerial work platform low engine oil pressure, filter alarm.

Troubleshooting Process:
– Checked filter: filter clogged.
– Checked oil quality: oil dirty.
– Checked bypass valve: valve seized.
– Checked replacement interval: not replaced on time.

Root Cause: The oil filter was not replaced for a long time, causing blockage.

Required Parts: Oil filter and engine oil change.