Screws And Torque Spanners; Chain / Drive - Stromer ST2 Operating Manual

If you install non-original or the incorrect
replacement parts, this can lead to a severe loss of
function! Tires with bad grip or tires that were not
designed for use in S-pedelecs, brake pads with
inappropriate friction coefficient and wrongly
used or badly designed light-weight components
can cause accidents with the most severe of con-
sequences. The same applies for improper assem-
bly!

Screws and torque spanners

When working on the S-pedelec, please en-
sure that all screws are tightened to the correct
torque. The required torque is printed on many
parts with a screwed connection. This amount is
stated in Newton meters (Nm) and this work
should be carried out using a torque wrench. Best
suited are torque wrenches that slip and provide
an acoustic signal when the predefined fastening
torque is reached. Otherwise, screws may snap or
break. If you don't own a torque wrench then you
should always leave this work to a Stromer dealer!
A table with the most important fastening torques
for screw connections is provided in the "Screw
connections" section.
Torque spanners
24 25
• Open live parts should only be maintained and
cleaned at a Stromer dealer!
• Remove the battery before cleaning your
S-pedelec. Ensure that the battery box is again
completely closed.
• Ensure that you do not touch and thus possibly
connect contacts when cleaning the battery.
You risk being hurt and the battery may suffer
damage if the contacts are live.
• Cleaning with a high-pressure cleaner may
damage the electrical system. The high pres-
sure might also push cleaning liquid into
sealed parts and thus damage them.
• Avoid damage to cables and electrical compo-
nents. When this has happened, the S-pedelec
must be deactivated until it has been inspected
by a Stromer dealer!
Switch off the electrical system, remove the
battery and close the battery box before perform-
ing any kind of work on your S-pedelec.

Chain / Drive

The drive chain must be regularly cleaned and
lubricated to ensure appropriate functioning (see
the "Deadlines and inspection work" section). Dirt
can be removed with the normal pedelec wash.
Otherwise you can clean the chain by rubbing
it with an oily cloth. When the chain is clean, it
should be greased at the joints with suitable lubri-
cant. After being left to soak, the excess lubricant
should then be removed.
Chain tension
To ensure that the chain and gears can work safe-
ly, the chain must have a certain level of tension.
Otherwise it can come off and lead to a fall. Chain
gear systems tense the chain automatically.
Dirt and permanent strain wear the chain.
The chain should be replaced as soon as it can be
significantly lifted (approx. 5 mm) from the front
chain ring with your fingers.
Replacement of the chain is to be expected after
approx. 1500 km, depending on the load.
Chain OK
Chain worn
Many modern chains for derailleur gear systems
no longer have chain connectors. Special tools
are required to open/exchange/close them. They
should be exchanged by a Stromer dealer.
Other chains are supplied/mounted with chain
joints. In some cases, these can be opened with-
out the need for tools. These chain connectors can
also be used to repair a damaged chain on a ride,
if they have the correct width for the drive train.