Fault Phenomenon: Skyjack SJ9650 telescopic boom aerial work platform engine runs on one cylinder, vibrates heavily.

Troubleshooting Process:
– Checked injector: injector needle valve stuck.
– Checked fuel quality: poor quality.
– Checked filter: filter failed.
– Checked temperature: temperature too high.

Root Cause: Poor diesel quality caused the injector needle valve to stick.

Required Parts: Injector assembly.