Fault Phenomenon: SANY SAP90C paver hydraulic screed extension speed is slow and cannot hold position.

Troubleshooting Process:
– Checked motor: extension motor severe internal leakage.
– Checked counterbalance valve: internal leakage.
– Checked cylinder: cylinder internal leakage.
– Checked pressure: system pressure insufficient.

Root Cause: The internal wear of the screed hydraulic extension motor causes severe internal leakage, leading to insufficient drive torque and inability to hold pressure.

Required Parts: Replace screed extension hydraulic motor.