Monark Ergomedic 839 E
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8.10 Freewheel sprocket
When replacing the freewheel sprocket remove
the wheel cover. Loosen the brake belt at the belt
tightener. Loosen the lower chain guard attach-
ment. Take away the screw for the two chain on
the right side and the front cover on left side.
Loosen the saddle post screw some turns so the
cover can be lifted up about 10 mm. To loosen
the back chain guard, push it backwards.
Dismantle the chain as described in part ”Chain
1/2” x 1/8” ”.
Loosen the axle nuts and lift off the flywheel.
Remove the axle nut, washer, chain adjuster and
spacer on the freewheel side. Place the special
remover (part No. 9100-14) in the adapter and
place the spacer and axle nut outside. See
fig:
Special remover.
NOTE: Do not tighten the axle nut completely. It
must be possible to loosen the adapter-sprocket
half a turn.
Replace sprocket-adapter and assemble again in
reverse order according to above points.
The sprocket should be lubricated with a few
drops of oil once a year. Tolt the cycle somewhat
to make it easier for the oil to reach the ball bea-
ring. See
fig: Lubrication.
Fig: Hub assembly
1) Adapter
2) Sprocket
3) Remover
4) Spacer
5) Axle nut
8.11 Flywheel bearing
The bearings in the flywheel are lifetime greased
and require normally no maintenance. If problem
arises, please contact your Monark dealer.
Fig: Lubrication
Fig: Special remover(1)
(part no: 9100-14)
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