Autoquip DOUBLE ARM SCISSOR LIFT TABLE - Manual (Page 27)

27
GENERAL MAINTENANCE
WARNING !
Before maintaining the lift, read & follow the recommended
safety practices in the Safety Practices section. Failure to follow
these safety practices could result in death or serious injury.
CYLINDER REMOVAL AND REPACKING
1. Raise the lift to its full height and block securely. See “Lift Blocking Instructions”.
2. Cut off the electricity to the power unit (lock out-tag out).
3. Disconnect the cylinder hose at the power unit end and insert it into the oil-fill
hole of reservoir.
4. Remove the roll pin(s) which are used to connect the cylinder rods to the bushed
crosshead mounts on the trunnion pins.
5. Remove the cylinder base & mounting rod from the scissors by unbolting the
retaining clips which hold the rod in position.
6. Lift the cylinder out of the leg assembly.
7. Push the piston rod into the cylinder to eject as much oil as possible into a
container.
8. Insert a Spanner wrench and turn the upper bearing assembly clockwise until the
tip of the retainer appears in the slot. Place a small screwdriver under the
retainer and turn it until the retainer is completely removed.
9. Be sure the hose port is open to allow air into the cylinder. Pull the piston rod out
to remove the upper bearing.
10. After all of the internal components have been 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.
11. Remove the piston head nut from the rod. The upper clevis and pin may be used
to prevent rotation of the rod while loosening. Remove the old piston.
12. Inspect the groove for nicks or scratches that could affect the seal or barrel walls;
remove as necessary.
13. Install the new piston, seals, and rod wiper.