99903514:TELESCOPIC CRANE: 3-15 SECTION 3: REPAIR20030115
3-16: INTERNAL CYLINDER REMOVAL
AND REPLACEMENT
All telescopic crane models have internal
extension and/or main cylinders. To remove
and replace an internal cylinder,
1. Prior to beginning work on any crane cylin-
ders, completely support the base, mast
and booms.
2. Position the crane with the inner and exten-
sion booms in a horizontal position.
3. Retract the extension booms completely.
4. Disconnect and cap the extension cylinder
hydraulic hoses. Plug the hose ports.
5. Remove the cable from the sheaves at the
end of the bom tip.
6. Unfasten and move anti-two block wires on
the extension boom only.
7. Refer to the parts book to determine which
pins and fasteners secure the cylinders on
your crane.
In all cases, you must remove the extension
cylinder and extension boom at the same
time.
On crane models 3820 and 5020, there is a
pin which connects the mast to the lower
boom. To remove the extension cylinder,
slide this pin out just until the extension
cylinder is free, but DO NOT REMOVE IT
COMPLETELY! By keeping the pin in place,
the lower boom will remain connected to the
base.
Models including the 1015 and 2020 do not
have pins securing the cylinders, and you
must remove bolts or fasteners.
8. Remove the cylinder.
Reverse this procedure to replace the cylinder.
See section 3A: Cylinder Repair for information
on how to repair the cylinder.
3-17: LOWER BOOM REMOVAL AND
REPLACEMENT
1. Lower the lower boom completely. Support
the base, mast and boom prior to disassem-
bly.
2. Identify and disconnect hydraulic hoses.
Cap or plug all open hydraulic fittings.
3. Disconnect rod ends of inner boom hoist
cylinders. Position a block for cylinders to
rest against. Be careful not to pinch or pull
hydraulic hoses.
4. Position 2 fabric slings of adequate capacity
around lower boom and cinch slings on
opposite sides of center of gravity. Hook
slings on hoist and raise hoist to tension the
sling.
5. Remove cap screw and retainer from inner
boom pivot pin. With aid of a heavy sledge
hammer and pin driving tool, remove the
inner boom and lay down on a firm work
support.
3-18: WIRE ROPE REMOVAL/REPLACE-
MENT
The maintenance section of this manual de-
scribes inspection criteria for wire rope. If the
wire rope is damaged, bent, or worn as defined
in Section 2-6, replace it using the following
steps:
1. Run out all wire rope from the winch, and
stretch it out straight. Disconnect the rope
from the cable guide on the side of the lower
boom.
2. Remove the clamp which secures the rope
to the boom tip. Pull the pin to release the
cable.
3. Unhook the wire rope from the winch spool
by removing the set screw or cable wedge
anchor.
4. Remove the wire rope.
Figure C-15: Internal Extension Cylinder
To Next Page
Loading...
Need help?
General
