Fault Phenomenon: Maximal FDM30 diesel forklift after continuous operation, the transmission oil temperature high alarm sounds, vehicle automatically limits speed.

Troubleshooting Process:
– Checked transmission oil level: level too high.
– Checked transmission cooler: cooler clogged.
– Checked transmission clutch: clutch slipping generates heat.
– Checked oil quality: oil deteriorated.

Root Cause: The exterior of the transmission cooler is clogged with dust, causing poor heat dissipation.

Required Parts: Transmission cooler cleaning or replacement.