Fault Phenomenon: The SANY SY75C excavator engine stalls suddenly without warning during operation. Restarting is difficult, and it stalls again shortly after starting.

Troubleshooting Process:
– Check fuel level: Sufficient fuel.
– Check water separator: Excessive water found, filter element clogged.
– Check hand pump: High resistance during pumping, difficult to purge air.
– Check electrical circuit: Fuel cut-off solenoid wiring is in good contact.
– Replace fuel filter and purge air from the line.

Fault Source: Clogged fuel filter causing insufficient fuel supply, triggering protective stall.

Required Parts: Fuel filter element, water separator cup.