Autoquip PDQ DOCK LIFT - Manual (Page 23)

23
CYLINDER AND/OR SEAL REPLACEMENT
Cylinder Removal
1. Lower the lift to the fully lowered position.
2. Continue to hold the “DOWN” button an additional 10 seconds after the lift has
stopped traveling downward to relieve the system pressure.
3. Always shut off the main electrical switch when maintenance is to be performed.
4. Unbolt the two hex head bolts that connect the cylinder to the platform.
5. Disconnect the hydraulic hose from the cylinder.
WARNING!
Do not remove the base clevis pin. This will cause the lift to collapse!
6. While protecting the cylinder rod from damage, pry upward and outward on the
cylinder rod.
Seal Replacement
1. Lay the ram assembly on its side.
2. To access the seal, push the rod down inside the casing past the seals by threading
a bolt into the end of the rod and simply pushing on the bolt. Take all precautions
not to scratch the cylinder rod.
3. Remove the old seal ring and backup ring. Inspect the seal groove for nicks and
scratches that could affect the seal. Remove as necessary.
4. Clean the groove thoroughly and install the new seal and backup. Lubricate the seal
with clean oil or grease.
5. Grasping the bolt in the end of the cylinder rod, pull the rod out of the casing taking
precaution against pinching or tearing the seal ring.
GENERAL MAINTENANCE