Tadano TR-800XXL4, Service Manual

Page: 172 / 402

H - 2 H - 2
Boom Length and Angle Detector
4
W305-0451E
2. Disassembly and reassembly
2.1 Removing the cord
1. Remove the connector and the cord lock from the
end of the cord. Wind up the cord on the drum
slowly until no tension of the spiral spring is
applied on the cord.
2. Loosen the clamp and remove the cover (2 place).
3. Disconnect the cable, potentiometer and angle
detector from the terminal, and remove the cover
and the cable together.
4. Loosen the set screw and remove the gear. Then
remove the screw and detach the speed reducer.
[NOTICE]
Remove the speed reducer straight upward. Do not
twist it while removing.
5. Remove the retaining ring and bolt, and separate
the case from the drum assembly.
[NOTICE]
Put match marks on the case and the plate to
identify the direction for removing the sub-cord.
IW305-0230E03
Retaining ring
Plate
Match marks
Sub-cord
Case
Bolt
6. Remove the nut and separate the drum assy from
the plate.
IW305-0230E04
Drum assy
Plate
Nut
7. Remove the slip ring assy from the drum assy.
Then remove the solder that bonds the slip ring
and the cord.
IW305-0230E05
Cord
Slip ring assy
Slip ring assy
Core wire
Shield wire
8. Detach the whole old cord from the drum assy.
2.2 Installing the cord
1. Wind a yellow tape around the new cord as a
0-marker.
2. Pass the new cord through the hole of the drum
assy. Solder it on the slip ring assy.
[NOTICE]
Attach the cord core wire to the inner slip ring.
Attach the shield wire to the outer slip ring.
Completely insulate the soldered section.