Autoquip DOUBLE PANTOGRAPH LIFT - Manual (Page 46)

46
' TH ' CYLINDER REPACKING (Reference Figure 6)
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.
Loosen the bolt in the cylinder upper clevis.
5.
Remove the cylinder pin from the upper clevis.
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.
14.
Check the piston head nut for tightness and torque to 600-650 ft. lbs on 3" & 3 ½”
bore cylinders or 850-950 ft. lbs. on 4” bore cylinders. The upper clevis and pin
may be used to prevent the rotation of the rod while tightening.
15. Liberally
lubricate the piston and seal with CLEAN grease or oil.
GENERAL MAINTENANCE