Bosch BULLS 650-185, Operating Instructions Manual

Page: 156 / 238

155
Cleaning and servicing
7.5.4 Checking the stem

The stem and quick release system must be
inspected at regular intervals. The specialist
dealer should adjust them if they require
adjustment.

If the
stem cap bolt is
loosened, the headset
play
needs to be adjusted. Medium-strength
thread locker, such as Loctite blue, then
needs to be applied to the loosened screws
and the screws tightened as per
specifications.

Check metal contact surfaces on cone, stem
clamping screw and fork steerer for corrosion.

Take
ebike
out of service if there is any wear or
signs of corrosion. Contact specialist dealer.
7.5.5 Check the handlebars
1 Take hold of handlebars with both hands on the
hand grips
.
2 Move handlebars up and down and press to tilt.
 If the handlebars move, contact specialist
dealer.
3 Place front wheel in position where it can't
move sideways (e.g. in a bike stand).
4 Hold handlebars firmly with both hands.
5 Check if the handlebars are able to twist
against the front wheel.
 If the handlebars can move, contact your
specialist dealer.
7.5.6 Checking the saddle
1 Hold saddle firmly.
2 Check whether the saddle twists, tilts or can be
pushed in one direction or other.

If the saddle twists, tilts or can be pushed in
one direction or other, adjust the saddle (see
Section xxx).
 Contact your specialist dealer if the saddle
cannot be fixed into position.
7.5.7 Checking the seat post
1 Take seat post out of the frame.
2 Check seat post for cracks and corrosion.
3 Reinsert seat post.
4 Check pedal.
5 Hold pedal and try to move it sideways toward
the inside or outside. In doing so, observe
whether the crank arm or bearing move
sideways.

If the pedal, crank arm or crank bearing moves
sideways, fasten screw on the pedal crank
rear.
6 Hold pedal and try to move it upwards and
downwards vertically. In doing so, observe
whether the pedal, crank arm or crank bearing
moves vertically.

If the pedal, crank arm or crank bearing moves
vertically, fasten screw.
7.5.8 Checking the chain
 Check chain for rust or warping.

Replace a rusted chain since it will not be able
to withstand the tensile loads from the drive.
Contact your specialist retailer.
7.5.9 Checking the chain and belt tension
7 If a hub gear is fitted, the rear wheel must be
pushed backwards and forwards to tighten the
chain. Contact specialist dealer.
Notice
Excessive chain tension increases wear. If the
chain tension is too low, there is a risk that the
chain will slip off the chain
rings
.
 Check the chain tension once a month.