Maeda MC815C, Service Manual, Page: 241 / 378

7-3
1.1 DISMOUNTING THE BOOM
1. Start the engine, lower the hook block assembly to the ground, and allow the winch wire to become slightly
loosened.
In this step, be aware of winding down too much to cause an irregular winding around the drum.
2. Stop the engine and remove the wedge socket.
3. Remove the wire clip assembly, take out the wedge, and remove the wire rope from the hook block assembly
and No.5 boom.
4. Restart the engine and take up the wire rope on the winch drum of the winch assembly.
In this step, be aware of causing an irregular winding.
5. Remove winch-related hoses and piping from the winch hose connection parts.
6. Remove the two telescoping cylinder hoses, then remove two elbows and two long connectors from each.
7. Remove the boom tail cover from the No.1 boom.
8. Remove the cable reel (length meter), angle sensor, hook grounding detector and over un-winding detector
(dead turns LS) connectors [CN31, CN32, S-ANG, CN41, S-LEN, LS-RS] and arrange them in the post
assembly area.
9. Remove the overwinding LS connector CN42, the cord on the top surface of the boom and wind it up onto the
cord reel. In this step, be cautious to prevent the cord end from entering the inside of reel.
10. Remove the mounting bolts of the length meter and angle meter.
11. Suspend the boom assembly and winch assembly, so they will not fall even if the derrick cylinder assembly and
foot pin are removed.
12. Pull out the derrick cylinder rod pin.
In this process, apply a steel pipe or other cushioning object to the rod pin, and knock it with a hammer to pull it
out.
13. Remove the foot pin bolt, and pull out the foot pin. In this process, apply a steel pipe or other cushioning object to
the foot pin, and knock it with a hammer to pull it out. Pay attention with regard to the centre of gravity when
removing the foot pin.
14. Hoist the boom assembly and winch assembly, to dismount them.
15. Remove the winch assembly from the boom assembly.
1.2 MOUNTING THE BOOM
・
Mount the assembly in the reverse order of dismounting.
1.3 CONNECTION DIAGRAM FOR BOOM EQUIPMENT