Tadano TR-800XXL4, Service Manual

Page: 53 / 402

33 W181-0440E
B - 9 . B - 9 .
Rotary Joint
2. Potentiometer
2.1 Adjustment
1. Install the potentiometer as shown in the figure
below. However, tighten the bolt for fixing the lever
lightly. (Do not fix the lever to the potentiometer
shaft because you must turn the potentiometer
shaft using the slotted screwdriver to adjust the
position of the shaft.)
IW181-0260E12
Hexagon socket head bolt Potentiometer
Slotted screwdriver
Lever Bolt (Tighten lightly.)
2. While keeping the stamp mark on the guide
oriented as shown in the figure below, adjust the
potentiometer as described in the following steps.
(If you adjust the potentiometer with the slip ring
assy installed on the crane, direct the boom
over-left to orient the stamp mark as shown in the
figure below.)
Guide
IW181-0260E13
Stamp mark
Slip ring assy
3. Turn the potentiometer shaft using a slotted
screwdriver so that the resistance between the
upper terminals 1 and 2 is minimum between 1
ohm and 15 ohm. Leave the terminals (6 pieces)
of the potentiometer disconnected.
IW181-0260E14
Potentiometer
Slotted screwdriver
Lower terminals 1, 2 and 3
Terminal 1
Upper terminals 1, 2 and 3
Terminal 2
Terminal 3
3
2
1
4. Remove the hexagon socket head bolts (4 pieces),
take out the potentiometer and fully tighten the
bolt for fixing the lever. Then install the
potentiometer and make sure that the resistance
between the upper terminals 1 and 2 is 15 ohm or
less.
2.2 Soldering
1. After finishing the potentiometer adjustment,
remove the hexagon socket head bolts (4 pieces)
and take out the potentiometer. Then solder the
wiring to the terminals (6 pieces).
2. To insulate the terminals (6 pieces) from one
another, coat the terminal section with epoxy
adhesive (equivalent to 3M DP-420).
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346-305-71000