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General Safety Information
WARNING
Obtain and read the service instructions carefully prior to installing the parts.
Loose, worn, or damaged parts may cause serious injury to the rider.
We strongly recommend only using genuine Shimano replacement parts.
Check that the wheels are fastened securely before riding the bicycle. If the wheels
are loose in any way, they may come off the bicycle and serious injury may result.
Check that the lamp illuminates normally when riding at nighttime.
Read these Technical Service Instructions carefully, and keep them in a safe place
for later reference.
CAUTION
The hub dynamo generates an extremely high voltage. Never touch the connection
terminal of the hub dynamo directly while riding the bicycle or while the wheel is
spinning. Touching the dynamo terminal may cause an electric shock.
NOTE:
The DH-2N20-DT/ HB-NX23-EC hub dynamo is rated for 6 V/ 2.4 W specifications. It
cannot be used for 6 V/ 3 W specifications.
The applicable wheels for the DH-2N20-DT hub dynamo are 24-inch to 28-inch wheels,
and the applicable wheels for the HB-NX23-EC hub dynamo are 20-inch to 24-inch
wheels.
Check the degree of parallel of the front fork end. If the front fork end is severely out of
parallel, deformation of the hub axle may cause noise from an obstruction inside the
hub dynamo to be generated.
Install the hub dynamo to the front fork so that the side with the connection terminal is
on the right when facing toward the front of the bicycle. If the side with the connection
terminal is facing toward the left, the hub dynamo may not turn properly while riding.
Check that the hub dynamo connection terminal is securely connected before using the
hub dynamo.
If the lamp is frequently turned on when riding at high speed ranges, it will shorten the
operating life of the bulbs.
Do not disassemble the internal hub mechanism.
Do not apply any lubricant to the inside of the hub, otherwise the grease will come out
and it may cause problems with conductivity.
The hub dynamo will cause the turning of the wheel to become slightly heavier
because of the magnet inside the hub.
Parts are not guaranteed against natural wear or deterioration resulting from normal
use.
– To avoid serious injuries:
– To avoid serious injuries:
Connection of the cables
Connect the cables as shown in the illustration below.
Note:
Scrape away the paint from the lamp's frame connection terminal
and the lamp connection terminal when connecting the cables.
Frame connection
terminal
Approx. 16 mm
Connector cap (gray)
Connector cover (black)
Note:
Set so that it faces the
right way.
Press in until you hear
a click.
Lamp connection
terminal
Lamp cable
Lamp connection terminal
Note:
Do not switch over the frame cable and the lamp cable
by mistake. If the cables are connected incorrectly, the
lamp will not illuminate.
Twist the cable wires before connecting them so that
they stay together.
Recommended wire specifications
Type
Wire
Insulation
Frame cable
Wire
Stranded
Size (AWG) 22
Diameter approx. 0.8 mm
Diameter 1.8 – 2 mm
Note:
Approx.
16 mm
Frame connection terminal
Bend the cable wires and run them
along the grooves.
Groove
Do not allow the cable wires to
touch each other.
Hub dynamo connection terminal
Insulation
Insert
Bend
SI-20N0E-001
DH-2N20
-DT
Hub Dynamo
HB-NX23
-EC
Technical Service Instructions
Installation of the front wheel
Install the wheel so that the side with the hub dynamo connection terminal is on
the right side when looking toward the front of the bicycle, and so that the hub
connection terminal is aligned with the front fork or with the basket stay. Then
install by following the procedure shown in the illustration below so that the
connection terminal is facing upward. Do not force the connection terminal to
turn after the hub nut has been secured.
Basket stay
Hub nut (M9)
Tightening torque:
20 – 25 N·m
{174 – 217 in. lbs.}
Washer
Connection terminal
Front fork
Mudguard stay
Note:
Secure the cable to the front fork or the basket stay so that it will not
get caught in the spokes or any other parts while riding. If the
position of the hub dynamo may change with respect to the lamp
while riding, for example when using a suspension fork, make sure
that the cable is connected so that it will not be too loose or too tight
at any point within the range of movement.
Connect so that the current from the hub dynamo flows through the
cable from the lamp connection terminal of the hub dynamo to the
frame connection terminal.
To disconnect the lamp from the hub dynamo, remove the connector
cover.
Do not ride the bicycle while the connector cover is removed, otherwise the cable might
get caught in the bicycle wheel.
When removing the bicycle wheel, first remove the connector cover. If the cables are
pulled strongly, it may break the cable wires
or cause poor contacts. Furthermore, when
installing the wheel, first secure the wheel to
the front forks and then connect the
connector cover.
Connector cover
Connect
Cable
Front fork
Remove
Checking the lamp illumination
Rotate the front wheel and check that the
lamp illuminates.
Connector
cover
Note:
When tightening the hub nuts, tighten
the nuts alternately on both sides and
do not concentrate all of the effort for
tightening and loosening the hub nut on
one side of the wheel only, otherwise
the hub axle may turn, which could
excessively tighten or loosen the lock
nuts.
Front fork
Mudguard stay
Basket stay
Connection
terminal
These service instructions explain how to use and maintain the Shimano bicycle parts which have been
used on your new bicycle. For any questions regarding your bicycle or other matters which are not related to
Shimano parts‚ please contact the place of purchase or the bicycle manufacturer.
Please note: Specifications are subject to change for improvement without notice. (English)
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai, Osaka 590-8577, Japan
Mar. 2007 by Shimano Inc. PIT. IZM. Printed in ChinaC
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