Autoquip COIL TRANSFER CARS - Manual (Page 22)

22
HYDRAULIC CYLINDER REPACKING
1. Raise the lift to its full height and block securely. See “Lift Blocking Instructions”.
2. Hold the “DOWN” control for several seconds to make sure pressure in the lines is
bled down.
3. Disconnect the cylinder hose at the power unit end and insert into the oil-fill hole of
the reservoir.
4. Remove the thrust angle clip from the ram (plunger) end of the cylinder and force
the ram slowly back to its fully closed position to push oil back into the reservoir.
5. Pull the ram all of the way out of the cylinder. Support it carefully so that it does
not drop when it clears the cylinder end. Lay it down in a safe, clean place. Some
oil may drip from the end of the cylinder so have waste cloth or paper beneath the
lift to protect the floor.
6. Remove the seal ring and backup ring.
7. After all of the internal components are removed, use a bright light to inspect the
inner walls of the barrel. Use a cylinder hone to remove any apparent nicks or
scratches. Clean and flush the barrel after honing.
8. Inspect the ram and seal groove for nicks or scratches that could affect the seal or
barrel walls; remove as necessary.
9. Clean the groove thoroughly and install the new seal and backup. Make sure the
backup ring is toward the open end of the cylinder.
10. Clean the ram of all foreign materials.
11. Liberally lubricate the ram and seal with CLEAN grease or oil.
12. Insert the ram carefully back into the cylinder taking precaution against pinching or
tearing the seal ring.
13. Reinstall the clip over the thrust angle.
14. Reconnect the cylinder hose .
GENERAL MAINTENANCE