Tadano TT-800XXL1, Service Manual

Page: 143 / 267

5
W305-023 1 E
H-2 H-2
Boom Length and Angle Detector
IW305-0230E07
Cord
Vinyl tube
Drum assy
Shield wire
Core wire
3. Install the slip ring assy so that the cord is not
slackened.
4. Wind the new cord around the drum assy while
taking up slack in the cord. When the 0-marker on
the 9.33 m (30.6ft) point of the cord shows on the
drum, wind the cord one turn more and fix it with
gummed tape to prevent slackening.
[NOTICE]
Wind the cord around the drum assy clockwise as
seen from the slip ring.
IW305-0230E08
Gummed tape
Slip ring
5. Insert the shaft of the drum assy into the boss
hole of the plate and fix it with a nut.
6. Put the case over the drum assy, leading the
sub-cord outside through the hole of the case and
the cord end outside through the opening of the
cord guide.
7. Secure the case and the plate with a bolt and
attach the retaining ring.
8. Apply sealant agent thinly on the bottom of the
speed reducer. Then install the speed reducer on
the case.
9. Inset the gear on the shaft of the speed reducer.
Loosen the set screw on the potentiometer side to
allow both gears to idle.
Check that the gear is spring-returned to the
original position after it is rotated a quarter turn by
finger and released. If it is not returned, loosen the
bolt and adjust the position of the bracket.
[NOTICE]
If the potentiometer is faulty, replace it referring to
the "Replacing the potentiometer (boom length
detector)" described later.
1 0. Fix the gear in the notched section of the speed
reducer shaft using a set screw. Apply thread
locking agent to the set screw.
Tightening torque : 1 . 1 8 N-m {0.87ft-lbf}
11 .Take out the new cord from the guide hole of the
cord reel and draw it out completely. Then wind it
again the drum. When the 0-marker comes to the
edge of the cord guide, fix the cord there as
shown in the figure.
IW305-0230E09
Gummed tape
0-marker
1 2. Applied voltage DC 5V to the potentiometer (for
boom length detector) as shown in the figure and
turn the gear using a screwdriver until the output
voltage between the red and white terminals is 0.5
± 0.06 V. Then fix the gear using a set screw.
Apply thread-locking agent to the set screw.
Tightening torque : 1 . 1 8N-m {0.87ft-lbf }
IW305-0230E 1 0
Bracket
Spring
Red
Gear A
Screwdriver
Set screw
-
+
-
+
Tester
Applied
voltage
Gear B
Black
White