The shiny part you mentioned is called the ram.
Rv hydraulic leveling jacks leaking.
We ve never had a day of trouble with our hwh hydraulic motorhome jacks until this epic fail where we self inflicted a problem on ourselves.
The grease fittings are in the cylinder portion.
That being the case power gear installs grease fitting at the bottom of the hydraulic cylinders.
Look closely to see if there is any hydraulic fluid leaking anywhere as well.
Stuck leveling jacks is something almost every rver will encounter.
Walk around the rv and put eyes on each of the jacks to determine if there are any obvious issues preventing you from getting the jacks retracted.
Hwh makes hard working hydraulic jacks for your rv horse trailer specialty vehicles.
Eric see the leveling system is using power gear equipment.