Tadano TT-800XXL1, Service Manual

Page: 144 / 267

6
W305-023 1 E
H-2 H-2
Boom Length and Angle Detector
1 3. Draw out the cord slightly from the drum and
make sure that the resistance between the red
and white terminals increases smoothly.
1 4. Connect the cable to the terminals for the
potentiometer and angle detector.
1 5. Attach the cover.
1 6. Pull the cable to eliminate slack, and tighten the
clamp. (2 places)
1 7. Install the cord lock on the cord end and install
the lead wires and the connector close to the cord
end. Completely insulate the soldered
connections.
IW305-0230E 11
7
10
70
50
Cord
Yellow
7
10
8.5 m
0.08 m
Cord lock
Connector
0.25 m
0-marker
White Lead wire
Wind HI-BOND tape for
waterproofing and then
wind insulating tape.
(27.9ft)
(0.8ft
)
(0.26ft)
1 8. Check for conduction and shortcircuit between
the terminals of the sub-cord connector and the
cord connector.
IW305-0230E 1 2
Cord
Sub-cord
2.3 Replacing spiral spring
[NOTICE]
If the spiral spring is broken, replace the whole
drum assy. For removing and installing the spring,
refer to the "Removing the cord" and "Installing the
cord" above mentioned.
2.4 Disassembling the potentiometer
(for boom length detector)
[NOTICE]
If both the cord and spiral spring are faulty, remove
the detector assy from the boom.
If only the potentiometer is faulty, it is not necessary
to remove the detector.
1 . Loosen the 2 clamps and remove the bolt and
cover.
2. Disconnect the lead wire terminals (3 pieces) and
cable terminal from the potentiometer, and
remove the potentiometer together with the
bracket.
[NOTICE]
Before replacement, disconnect the wiring to the
boom angle detector from the pin terminal section to
disconnect the lead wires (red and black) from the
boom angle detector.
IW305-0230E 1 3
Bracket
Pin terminal
To boom angle detector
Potentiometer
Red
Spring
Gear
Lead wire
Black
3. Remove the gear and the spring, and detach the
potentiometer from the bracket.
4. 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 spring is applied on
the cord.