Shimano MTB SHADOW RD-M670 Dealer's Manual - Page 20
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Replacing the B tension spring (RD-M4000 / RD-M3000)
1.
Remove the E-ring from the bracket axle.
Note:
Some models do not have an E-ring. (Function is not affected.)
2.
Remove the bracket axle using a 5 mm Allen key, then remove the B tension spring and adapter set from the bracket member.
Bracket axle
5 mm Allen key
3.
Remove the B tension spring from the adapter set.
Bracket axle
B axle bush
B tension
spring
20
E-ring
Adapter set
B tension
spring
Tightening torque:
8.0 - 10.0 N·m {70 - 87 in. lbs.}
Bracket member