Fault Phenomenon: UpRight TB60 telescopic boom aerial work platform oil stain on the hydraulic pump housing, lifting weak.

Troubleshooting Process:
– Checked oil seal: oil seal aged.
– Checked housing: housing cracked.
– Checked mating surface: gasket failed.
– Checked oil level: level too high.

Root Cause: The hydraulic pump input shaft oil seal has aged and failed.

Required Parts: Hydraulic pump oil seal repair kit.