Shimano DH-3NA1, HB-NX60-A3 Service Instructions

SI-20C0A-003-00

General Safety Information

WARNING

●

The tire outer diameter for wheels which are compatible with the
DH-3R30-A3 hub dynamos is 492-517 mm.
If the hub dynamo is used on a bicycle with a tire outer diameter which
is smaller than 492 mm, the braking force may be too great, which could
cause the wheels to lock and the bicycle to lose its balance and fall over.

●

The hub of DH-3R30-A3 has a built-in power modulator which controls
the braking force to prevent it from being too great. When the braking
force reaches a certain level, the power modulator operates to prevent
the braking force from going past that level.
The recommended operating range for the power modulator is for
bicycles with a gross weight (bicycle + rider + luggage) of 65 – 105 kg
{144 – 232 lb.} (for the DH-3R30-A3). If the gross weight of the bicycle
is heavier than the recommended weight range, the braking force may
be insufficient, and if it is lighter than the recommended weight range,
the braking force may become too great and the wheels may lock and
bicycle may fall over. It is essential that you fully understand and test the
performance of the power modulator before use.
The power modulator is not equipped with a function to prevent the
wheel from locking up.

●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

●

This hub dynamo is for use with the AI-3S30 auto-shift unit only. It
cannot be used with products other than the AI-3S30.

●

Since the DH-3R30-A3 is not designed to be connected to a lamp, do
not connect it to a lamp.

●

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:

●

Carefully read the Front Inter-M Brake System Service Instructions for
roller brakes in conjunction with these Service Instructions when using
the hub HB-NX60-A3 for roller brakes.

●

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 injuries:

SI-20C0A-003

DH-3NA1
DH-3R30-

A3

Hub Dynamo
(for AI-3S30 only)

HB-NX60-A3

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

Front fork

connection terminal to turn after the
cap nut has been secured.

Tightening torque:

Mudguard stay

20 N•m
{174 in. lbs.}

Cap nut (M9)

Basket stay

Washer

Note:

When tightening the cap
nuts, tighten the nuts
alternately on both sides
and do not concentrate all of
the effort for tightening and
loosening the cap nut on
one side of the wheel only,
otherwise the hub axle may
turn, which could excessively
tighten or loosen the lock
nuts.

Basket stay

Front fork

Mudguard stay

Connection
terminal

Removing and installing the front wheel

●

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
suspension fork or other parts move while riding, 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.

●

Do not ride the bicycle while the connector is removed, otherwise the
cable might get caught in the bicycle wheel.

●

When removing the bicycle wheel, first remove the connector. 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.

●

Always make sure that the ground marks (
connection terminals are aligned when connecting the connector.

Ground marks ( )

Connector

Connect

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.

Service Instructions in further languages are available at: http://techdocs.shimano.com

*
Please note: Specifications are subject to change for improvement without notice. (English)

SHIMANO AMERICAN CORPORATION

One Holland, Irvine, California 92618, U.S.A. Phone: [phone]

SHIMANO EUROPE B.V.

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone]

SHIMANO INC.

3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

) on the connector and the

Cable

Front fork

Sep. 2024 by SHIMANO INC. ITP

©