Fault Phenomenon: Caterpillar AP655D paver when spraying emulsified asphalt, some nozzles do not discharge, spray uneven.

Troubleshooting Process:
– Checked nozzles: nozzle holes clogged with debris.
– Checked strainer: line strainer screen damaged.
– Checked fluid: emulsified asphalt separated and clumped.
– Checked cleaning: lines not cleaned after operation.

Root Cause: The spray lines were not flushed with water promptly after operation, causing residual emulsified asphalt to dry and clog the nozzles.

Required Parts: Remove, clean, or replace nozzles; clean strainer.