The lift cylinder is the double-acting-type with a
cylinder. The backup rings protect the O-ring from
cylinder bore of 7.5 in. (19.1 cm). The retracted
damage and prevent movement of the O-ring seal
length of the cylinder from the center of the barrel
during rod retraction and extension. The O-ring seal
bushing to the center of the rod bushing is 102.6 in.
between the rod side and the piston prevents internal
(260.6 cm). The extended length of the cylinder from
the center of the barrel bushing to the center of the
rod bushing is 184.6 in. (468.9 cm). Foreign matter
The cylinder weighs approximately 685 lbs (310.7
is prevented from entering the cylinder by a wiper
kg) dry and 713 lbs (323.4 kg) wet.
seal. An O-ring seal prevents oil leakage from the
For Removal and Installation procedures, refer to LIFT CIRCUIT in
Exercise extreme care when handling or
setting down the cylinder rod. Do not
damage the chrome surface.
Any maintenance requiring disassembly
of the cylinder should include replace-
Remove the cylinder rod assembly from the
ment of all cylinder seals and O-rings.
cylinder barrel and cover the barrel to avoid
It may be necessary to heat cylinder in
setscrew area to break cylinder head
When removing seals and rings, avoid
loose from cylinder.
scratching grooved and gland surfaces.
Remove the setscrew securing the cylinder
head and using a spanner wrench, unscrew the
cylinder head, refer to Figure 2-8-22.
Aligning discarded seals and rings in the
order of disassembly will facilitate
installation of new items.
Do not use air pressure to remove the
Remove the hydrolock piston seal to gain
cylinder rod assembly. Use only a
access to the setscrew securing the piston to the
source of controlled hydraulic oil
pressure, if the rod is hard to remove.
Remove the setscrew and unscrew the piston
from the cylinder rod.