STRUCTURALS 5540F/YB5515 SERVICE MANUAL
11-4
Removal of Boom Assembly
1. Remove the hook block and wire rope.
2. Retract the boom
3. Remove the boom extension, if installed.
4. Raise the boom until the pin in the rod end of the lift
cylinder can be seen.
NOTE: Use at least a 2 ton (1.8 Metric Ton) overhead
crane when lifting the boom assembly. Be sure
slings and/or chains are capable of handling a 2 ton
(1.8 Metric Ton) load.
5. Connect a hoist to the boom that will lift more than 4000
lb. (1812 kg).
6. Release the hydraulic pressure in the winch and
telescope circuits. Disconnect the hydraulic tubes on
mast from the hydraulic hoses coming from the boom.
Put caps and plugs on the hydraulic tubes and hoses.
7. Disconnect any electrical wires. See Electric System,
Section 11.
8. Place a support under the cylinder to inhibit damage to
the cylinder. Remove the pin from the rod of the lift
cylinder. Retract the lift cylinder rod.
9. Remove the boom pivot pin and remove the boom.
Place the boom on blocks or steel horses.
Installation of the Boom Assembly
NOTE: Use at least a 2 ton (1.8 Metric Ton) overhead
crane when lifting the boom assembly. Be sure
slings and/or chains are capable of handling a 2 ton
(1.8 Metric Ton) load.
1. Using an overhead crane, position the boom between
the ears of the mast. Install the mounting pin and fasten
with keeper pins and bolts.
2. Lower the boom or extend the lift cylinder as necessary
to install the lift cylinder pin and keeper pin and bolt.
3. Connect hoses from the hydraulic swivel to the
telescope cylinder.
4. Connect electrical wiring as necessary. Refer to Section
11, Electrical System.
5. Install the wire rope and hook block.
6. Start the engine and operate all boom functions in both
directions to remove air from the hydraulic system.
Check for leaks.
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