Shimano FH-M770 Service Instructions

Browse online or download pdf Service Instructions for Bicycle Accessories Shimano FH-M770. Shimano FH-M770 1 pages. Freehub; front hub

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General Safety Information

WARNING

• 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.

• Obtain and read the service instructions carefully prior to installing the parts. Loose,

worn, or damaged parts may cause injury to the rider.

We strongly recommend only using genuine Shimano replacement parts.

• Read these Technical Service Instructions carefully, and keep them in a safe place for

later reference.

Note

• Use the CS-M770 in combination with 9-speed chains (CN-7701 / HG93 / HG73 / HG53).

• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.

• Do not apply any oil to the inside of the hub, otherwise the grease will come out.

• You should periodically wash the sprockets in a neutral detergent and then lubricate them

again. In addition, cleaning the chain with neutral detergent and lubricating it can be a

effective way of extending the useful life of the sprockets and the chain.

• If the chain keeps coming off the sprockets during use, replace the sprockets and the

chain.

• Parts are not guaranteed against natural wear or deterioration resulting from normal use.

• For maximum performance we highly recommend Shimano lubricants and maintenance

products.

Technical Service Instructions

FH-M775 / FH-M770

HB-M775 / HB-M770

Specifications

Freehub / Front hub

Freehub

Model No.

FH-M775

FH-M770

Gears

No. of spoke holes

32 / 36

Overlock nut dimensions

135 mm

Applicable brakes

Disc brake

Rim brakes

Cassette sprocket tooth combination

Model number

Group name

Gears

11, 12, 14, 16, 18, 21, 24, 28, 32T

CS-M770

11, 13, 15, 17, 20, 23, 26, 30, 34T

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-shi, Osaka 590-8577, Japan

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

<FH-M775 / FH-M770>

Installation of the HG sprockets

For each sprocket, the surface that

has the group mark should face

outward and be positioned so that

the wide parts of the gear

projections on each sprocket and

the A part (where the groove width

is wide) of the freewheel body are

aligned.

The groove is

wide at one

place only.

CS-M770 (a

)

CS-M770 (as)

SI-3CZ0A-002

Freehub / Front hub

Replacement of the freewheel body

First, pull out the hub axle by following the procedure shown in the illustration.

The double-lock section at the freewheel side cannot be disassembled.

(1)

Front hub

HB-M775

HB-M770

Disassembly

––

32 / 36

100 mm

Disc brake

Rim brakes

5 mm Allen key

Tooth combination

Left side Tightening torque:

15 - 20 N·m {132 - 172 in. lbs.}

(3)

For installation of the HG sprockets, use the special

tool (TL-LR15) to tighten the lock ring.

Tightening torque:

30 - 50 N·m {261 - 434 in. lbs.}

To replace the HG

sprockets, use the

special tool (TL-LR15)

Wide part

and TL-SR21 to remove

the lock ring.

TL-LR15

Disassembly

Lock ring

Sprocket spacer

Lock ring spacer

Lock ring

Lock ring spacer

(2)

Rotor fixing serrations

(FH-M775)

Seal

Cone with dust cover

(Cannot be disassembled)

17 mm spanner

Lip is on the outside

Note:

• When removing and installing the seal, do it very

carefully so that the seal does not become bent.

When reinstalling the seal, make sure that it is

facing the right way, and insert it as far as it will go.

• Do not disassemble the dust-proof cover which is

crimped onto the cone.

• The rotor fixing serrations may become damaged if

the disc brake rotor has not been installed to the

FH-M775, so install the accessory rotor mount

cover.

Hub axle

After removing the hub axle, remove the freewheel body

fixing bolt (inside the freewheel body), and then replace the

freewheel body.

Note:

Be sure to apply grease to the the thread of the

freewheel body fixing bolt, otherwise looseness or

sticking may occur.

Do not attempt to disassemble the

freewheel body, because it may

result in a malfunction.

Lock ring

14 mm Allen key

Tool

(TL-SR21)

<HB-M775 / HB-M770>

Maintenance

The unit can be disassembled as shown

in the illustration.

Apply grease to the various parts at

periodic intervals.

<HB-M775>

Rotor mount cover

Seal

<HB-M770>

Seal

Use the special tool (TL-HS22/HS20 /17mm)

for installing the hub axle and a 5 mm Allen

key to tighten the lock nut so as to double-lock

the mechanism as shown in the illustration.

Tightening torque:

15 - 17 N·m {132 - 146 in. lbs.}

<FH-M775 / HB-M775>

Wheel spoke lacing

Check that the spokes have been laced as shown in the

illustration.

A radial assembly cannot be used.

Rotating direction of wheel

Front left

Rear left Rear right

Front right

Freewheel body

Applying grease

DURA-ACE grease

(Y-04110000)

Freewheel body washer

Do not disassemble

Freewheel body

the seal.

fixing bolt

Tightening torque:

45 - 50 N·m {392 - 434 in. lbs.}

Note:

• The HB-M775 cannot be disassembled from the left side of

the hub unit (the rotor fixing serration side).

• When removing and installing the seal, do it very carefully so

that the seal does not become bent.

When reinstalling the seal, make sure that it is facing the right

way, and insert it as far as it will go.

• The rotor fixing serrations may become damaged if the disc

brake rotor has not been installed to the HB-M775, so install

the accessory rotor mount cover.

Seal

5 mm Allen key

Hub axle

TL-HS22/HS20

Tighten

Installation of the rotor

Rotor fixing

lock ring

TL-LR15

Tightening torque:

40 N·m {350 in. lbs.}