Shimano CN-HG50, CS-HG20-7, CS-HG30-8I, CS-HG30-I, CS-HG40-8I Service Instructions

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Page 1
5 mm Allen key
Dropout tab
B-tension adjustment screw
Rapidfire Plus
Outer casing
Rear derailleur
Type
Gears
Cassette sprocket
Chain
Bottom bracket guide
Technical Service Instructions
Rear Drive System
In order to realize the best performance, we recommend that the following combination be used.
Specifications
Model number
Type
Total capacity
Largest sprocket
Smallest sprocket
Front chainwheel tooth difference
Applicable front chainwheel (chainring tooth configuration)
Rear Derailleur
Model number Tooth combination
Cassette sprocket tooth combination
Sprockets Group name
Installation of the rear derailleur
When installing, be careful that deformation is not caused by the B-tension adjustment screw coming into contact with the dropout tab.
Bracket spindle tightening torque:
8 - 10 N·m {70 - 86 in. lbs.}
Replacement of the freewheel body
After removing the hub axle, remove the freewheel body fixing bolt (inside the freewheel body), and then replace the freewheel body.
Note: Do not attempt to disassemble the freewheel body, because it may result in a malfunction.
Freewheel body Freewheel body fixing bolt
Freewheel body washer
10 mm Allen key
(TL-WR37)
Disassembly
Assembly
Tightening torque:
35 - 50 N·m {305 - 434 in. lbs.}
For the best SIS performance, periodically lubricate all power-transmission parts.
5. SIS Adjustment
Operate the shifting lever several times to move the chain to the 2nd sprocket. Then, while pressing the lever just enough to take up the play in the lever, turn the crank arm.
When shifting to 3rd
Tighten the outer cable adjusting barrel until the chain returns to the 2nd sprocket. (clockwise)
Loosen the outer casing adjustment barrel until the chain touches the 3rd sprocket and makes noise. (counter clockwise)
Outer casing adjustment barrel
Best setting
The best setting is when the shifting lever is operated just enough to take up the play and the chain touches the 3rd sprocket and makes noise. * Return the lever to its original position (the position where
the lever is at the 2nd sprocket setting and it has been released) and then turn the crank arm clockwise. If the chain is touching the 3rd sprocket and making noise, turn the outer casing adjustment barrel clockwise slightly to tighten it until the noise stops and the chain runs smoothly.
Operate lever to change gears, and check that no noise occurs in any of the gear positions.
Tightening torque :
5 - 7 N·m {44 - 60 in. lbs.}
Tightening torque :
0.3 - 0.5 N·m {3 - 4 in. lbs.}
Groove
Connect the cable to the rear derailleur and, after taking up the initial slack in the cable, re-secure to the rear derailleur as shown in the illustration.
Pull
Note: Be sure that the cable is
securely in the groove.
Tightening torque :
6 - 8 N·m {53 - 69 in. lbs.}
5 mm Allen key
Use a handlebar grip with a maximum
outer diameter of 32 mm.
Installation of the shifting lever
Installation of the sprockets
For each sprocket, the surface that has the group mark should face outward and be positioned so that the triangle (
U) mark on each sprocket and the A part (where the groove width is wide) of the freewheel body are aligned.
For installation of the HG sprockets, use the special tool (TL-LR15 / LR10) to tighten the lock ring.
To replace the HG sprockets, use the special tool (TL-LR15 / LR10) and TL-SR21 to remove the lock ring.
The groove is wide at one place only.
a
c
-
1
4
T
A
U mark
Tightening torque:
30 - 50 N·m {261 - 434 in. lbs.}
Lock ring
1
2
1 2
Outer line of smallest sprocket
Lever (B)
Screw
Cover
Guide pulley
Inner cable
Low adjustment
screw
1. Top adjustment
Turn the top adjustment screw to adjust so that the guide pulley is in line with the outer line of the smallest sprocket when looking from the rear.
2. Connecting and securing the inner cable
Operate lever (B) at least 7 times to set the lever to the highest position. Remove the screw, and then remove the cover. Pull out the inner cable as shown in Figure, and then install the new inner cable.
SIS Adjustment
Cutting the outer casing
When cutting the outer casing, cut the opposite end to the end with the marking. After cutting the outer casing, make the end round so that the inside of the hole has a uniform diameter.diameter.
Attach the same outer end cap to the cut end of the outer casing.
Outer end cap
Inserting the inner cable
Insert the inner cable into the outer casing from the end with the marking on it. Apply grease from the end with the marking in order to maintain cable operating efficiency.
Marking
4. How to use the B-tension adjustment screw
Mount the chain on the smallest chainring and the largest sprocket, and turn the crank arm backward. Then turn the B­tension adjustment screw to adjust the guide pulley as close to the sprocket as possible but not so close that it touches. Next, set the chain to the smallest sprocket and repeat the above to make sure that the pulley does not touch the sprocket.
1
2
1 2
2
1
Largest sprocket
Smallest sprocket
Chain
Largest chainringLargest chainring
Gear shifting operation
Both lever (A) and lever (B) always return to the initial position when they are released after shifting. When operating one of the levers, always be sure to turn the crank arm at the same time.
To shift from a small sprocket to a larger sprocket (Lever A)
To shift one step only, press lever (A) to the (1) position. To shift two steps at one time, press to the (2) position.
To shift from a large sprocket to a smaller sprocket (Lever B)
Press lever (B) once to shift one step from a larger to a smaller sprocket.
1
2
Lever (A) initial
position
Lever (B)
Lock ring
Tool (TL-SR21)
Disassembly
TL-LR15/LR10
Add 2 links (with the chain on both the largest sprocket and the largest chainring)
Chain length
3. Low adjustment
Turn the low adjustment screw so that the guide pulley moves to a position directly in line with the largest sprocket.
1
1 2
2
Largest sprocket
Guide pulley
Low adjustment
screw
B-tension
adjustment screw
When no sound at all is heard
Outer casing adjustment barrel
WARNING
• If it is necessary to adjust the length of the chain due to a change in the number of sprocket teeth, make the cut at some other place than the place where the chain has been joined using a reinforced connecting pin or an end pin. The chain will be damaged if it is cut at a place where it has been joined with a reinforced connecting pin or an end pin.
• Check that the tension of the chain is correct and that the chain is not damaged. If the tension is too weak or the chain is damaged, the chain should be replaced. If this is not done, the chain may break and cause serious injury.
Obtain and read the service instructions carefully prior to installing the parts. Loose, worn or damaged parts may cause the bicycle to fall over and serious injury may occur as a result. We strongly recommend only using genuine Shimano replacement parts.
Obtain and read the service instructions carefully prior to installing the parts. If adjustments are not carried out correctly, the chain may come off and this may cause you to fall off the bicycle which could result in serious injury.
• Read these Technical Service Instructions carefully, and keep them in a safe place for later reference.
Note
• If gear shifting operations do not feel smooth, wash the derailleur and lubricate all moving parts.
• If the amount of looseness in the links is so great that adjustment is not possible, you should replace the derailleur.
• You should periodically clean the derailleur and lubricate all moving parts (mechanism and pulleys).
• If gear shifting adjustment cannot be carried out, check the degree of parallelism at the rear end of the bicycle. Also check if the cable is lubricated and if the outer casing is too long or too short.
• If you hear abnormal noise as a result of looseness in a pulley, you should replace the pulley.
• 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.
• Always be sure to use the sprocket set bearing the same group marks. Never use in combination with a sprocket bearing a different group mark.
• Use a frame with internal cable routing is strongly discouraged as it has tendencies to impair the SIS shifting function due to its high cable resistance.
• Use an outer casing which still has some length to spare even when the handlebars are turned all the way to both sides. Furthermore, check that the shifting lever does not touch the bicycle frame when the handlebars are turned all the way.
• Grease the inner cable and the inside of the outer casing before use to ensure that they slide properly.
• Operation of the levers related to gear shifting should be made only when the front chainwheel is turning.
• Parts are not guaranteed against natural wear or deterioration resulting from normal use.
• For maximum performance we highly recommend Shimano lubricants and maintenance products.
• For any questions regarding methods of installation, adjustment, maintenance or operation, please contact a professional bicycle dealer.
Chain toolChain
9-speed super narrow chain
such as
CN-7701 / CN-HG93
8- / 7- / 6-speed narrow
chain such as
CN-HG50 / CN-HG40
Reinforced
connecting pin
TL-CN32 /TL-CN27
TL-CN32 /TL-CN27
6.5mm
7.1mm
Silver
Black
g
a
-
18
T
-
S
H
I
M
A
N
O
H
Y
P
E
R
G
L
I
D
E
C
a
g
-
1
5
T
a
g
-
1
3
T
Group marks
Reinforced Connecting Pin
End Pin Link Pin
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
This service instruction explains 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.
SI-6TP0A-003-00
“Maintenance interval depends on the usage and riding circumstances. Clean regularly the chain with an appropriate chaincleaner. Never use alkali based or acid based solvents such as rust cleaners. If those solvent be used chain might break and cause serious injury.”
• 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.
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• There are two different types of reinforced connecting pins available. Be sure to check the table below before selecting which pin to use. If connecting pins other than reinforced connecting pins are used, or if a reinforced connecting pin or tool which is not suitable for the type of chain is used, sufficient connection force may not be obtained, which could cause the chain to break or fall off.
SIS
RD-M360 / RD-M310
RD-M360 (SGS) / RD-M310 (Smart Cage)
CN-HG50 / CN-HG40
SM-SP18 / SM-BT18
ST-EF51-8R ST-EF51-7R
FH-RM30-8 FH-RM30-7
87
CS-HG40-8I CS-HG30-8I
CS-HG40-8I (an, aw, ao) CS-HG30-8I (an, aw, ao)
CS-HG30-I (ac) CS-HG20-7 (E)
CS-HG30-I
CS-HG20-7
RD-M360 / RD-M310
RD-M360 (SGS) / RD-M310 (Smart Cage)
43T
28T - 34T
11T
20T
FC-M311 (42-32-22T / 48-38-28T)
FC-M171 / M131 (42-34-24T / 48-38-28T)
CS-HG40-8I CS-HG30-8I
CS-HG30-I
CS-HG20-7
11, 13, 15, 17, 20, 23, 26, 30T
11, 13, 15, 18, 21, 24, 28, 32T
11, 13, 15, 17, 20, 23, 26, 34T
00, 11, 13, 15, 18, 21, 24, 28T
00, 12, 14, 16, 18, 21, 24, 28T
8
8
8
7
7
an
aw
ao
ac
E / bm
General Safety Information
SI-6TP0A-003
* Service Instructions in further languages are available at : http://techdocs.shimano.com
Please note: specifications are subject to change for improvement without notice. (English) © Sep. 2024 by SHIMANO INC. ITP
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