Lift Cylinder Repair
4000 SRM 135
Lift Cylinder Repair
LIFT CYLINDER REMOVAL WITHOUT
REMOVING MAST
Remove the carriage before the lift cylinder. See the
procedure described in the Masts section. If the mast
must be removed for repairs, then remove the lift
cylinder when the mast is disassembled. Remove the
lift cylinder from the mast as described in the follow-
ing paragraphs.
Standard Masts With Main Lift Cylinder
Fastened to Crossmember of Inner Mast
1.
Fully lower the mast. Loosen, but do not discon-
nect the capscrew that fastens the cylinder rod to
the crossmember of the inner mast.
2.
Clean the area next to the fittings that connect
the hydraulic lines to the lift cylinder.
Put a
drain pan under the area where the hydraulic
lines will be disconnected. Disconnect the hy-
draulic lines and put a cap on each open fitting.
WARNING
Make sure the lifting mechanism has enough
capacity to lift the loads. See the Weight Guide
for lift cylinders in Table 2.
3.
Connect a lifting mechanism to the inner mast.
Lift the inner mast approximately 300 mm
(12 in.). Fasten the inner and outer masts to-
gether at the crossmembers with a heavy chain.
Make sure that the inner mast cannot move.
Remove the lifting mechanism.
4.
Connect a heavy-duty sling to the upper part of
the cylinder. Raise the lifting mechanism until
the sling is tight. Make sure the sling will not
slide.
5.
Remove the capscrew and washer connecting the
piston rod to the inner mast. Remove the spacer.
CAUTION
Oil can come out of the cylinder fittings with
pressure when retracting the rod.
6.
Loosen the cap on the lower fitting of the cylinder.
Manually retract the piston rod.
7.
Remove the capscrew and the plate from the
lower side of the cylinder.
8.
Raise the cylinder and move it away from the
mast. Move the lift cylinder to a position where
it can be disassembled.
Standard and Full Free-Lift Masts With Lift
Cylinder Fastened to Crosshead
1.
Remove the lift chains and chain anchors from
the mast and the lift cylinder. Connect a sling
to the upper area of the lift cylinder. Raise the
lifting mechanism until the sling is tight. See
Figure 12 and Figure 13.
2.
Remove the capscrews that connect the piston
rod to the crosshead.
3.
Disconnect and remove the crosshead assembly
from the mast. Make a note of the shim arrange-
ment on the crosshead guide.
4.
Clean the area next to the fittings that connect
the hydraulic lines to the lift cylinder.
Put a
drain pan under the area where the hydraulic
lines will be disconnected. Disconnect the hy-
draulic lines and put a cap on each open fitting.
5.
Remove the snap ring that connects the bottom
of the lift cylinder to the outer mast.
6.
Raise the lift cylinder and move it away from the
mast. Move the lift cylinder to a position where
it can be disassembled.
Masts That Have Two Cylinders, Main Lift
Cylinder and Free-Lift Cylinder
1.
Remove the free-lift cylinder as described in
the section above for removing a lift cylinder
fastened to a crosshead.
2.
Remove the main lift cylinder as described in
the section above for removing a lift cylinder fas-
tened to an inner mast.
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