Battery - Charging; Inspection And Maintenance - Yamaha TDM850 User Manual

9*4 Electrical system
3.4a Unscrew the bolt (arrowed) on each side.
unscrew the two bolts securing the battery box
and lift out the box (see illustrations). 5 On
installation, clean the battery terminals and lead
ends with a wire brush or knife and emery paper.
Reconnect the leads, connecting the positive
(+ve) terminal first.
IJfQflfl-l Battery corrosion can be
llUiilSl jcgpf minimum
to g oy
Hi AIT applying a layer of
petroleum jelly to the
terminals after the cables have been
connected.
6 Install the seat(s) (see Chapter 8).

Inspection and maintenance

7 The battery fitted to XTZ models is of the
conventional lead/acid type, requiring regular
checks of the electrolyte level, as described in
Chapter 1, in addition to those detailed below.
8 The battery fitted to TDM and TRX models is
of the maintenance free (sealed) type, therefore
requiring no specific maintenance. However, the
following checks should still
performed.
9 Check the battery terminals and leads for
tightness and corrosion. If corrosion is evident,
unscrew the terminal screws and disconnect the
leads from the battery, disconnecting the
negative (-ve) terminal first, and clean the
terminals and lead ends with a wire brush or
knife and emery paper. Reconnect the leads,
connecting the negative (-ve) terminal last, and
apply a thin coat of petroleum jelly to the
connections to slow further corrosion.
10 The battery case should be kept clean to
prevent current leakage, which can discharge the
battery over a period of time (especially when it
sits unused). Wash the outside of the case with a
solution of baking soda and water. Rinse the
battery thoroughly, then dry it.
11 Look for cracks in the case and renew the
battery if any are found. If acid has been spilled
on the frame or battery box, neutralise it with a
baking soda and water solution, dry it
thoroughly, then touch up any damaged paint.
12 If the motorcycle sits unused for long periods
of time, disconnect the cables from the battery
terminals, negative (-ve) terminal first. Refer to
Section 4 and charge the battery once every
month to six weeks.
13 The condition of the battery can be assessed
by measuring the voltage present at the battery
terminals. Connect the voltmeter positive (+ve)
probe to the battery positive (+ve) terminal, and
the negative (-ve) probe to the battery negative (-
ve) terminal. When fully charged there should be
more than 12.5 volts present. If the voltage falls
below 12.5 volts the battery must be removed,
disconnecting the negative (-ve) terminal first,
and recharged as described in Section 4.
14 On XTZ models, if available, an hydrometer
should be used to measure the specific gravity of
the electrolyte. Remove the battery and its cell
caps, then measure each cell in turn. If the
reading is below the level specified, the battery
should be recharged.
[Ifyflfg!j Refer to 'Fault Finding
be regularly
'"
HINT
Reference
section for more Information on
battery voltage and specific
gravity checks.
Caution: Be extremely careful when handling
or working around the battery. The electrolyte
is very caustic and an explosive gas
(hydrogen) is given off when the battery is
charging. 1 Remove the battery (see
Section 3). Connect the charger to the battery,
making sure that the positive (+ve) lead on the
charger is connected to the positive (+ve)
terminal on the battery, and the negative (-ve)
lead is connected to the negative (-ve) terminal.
3.4b ... and lift out the box
2 If the battery is fully discharged, Yamaha
recommend that the battery should be charged
for a maximum of 6.5 hours (TDM and TRX
models) or at a maximum rate of 0.4 amps for 10
hours (XTZ models). If the battery was partially
charged, the battery should be charged until the
voltage across the terminals reaches 12.8 V, or
on XTZ models until the specific gravity is at its
correct reading (see above). Exceeding this can
cause the battery to overheat, buckling the plates
and rendering it useless. Few owners will have
access to an expensive current controlled
charger, so if a normal domestic charger is used
check that after a possible initial peak, the charge
rate falls to a safe level (see illustration). If the
battery becomes hot during charging stop.
Further charging will cause damage. Note: In
emergencies the battery can be charged at a
higher rate of around 3.0 amps for a period of 1
hour. However, this is not recommended and the
low amp charge is by far the safer method of
charging the battery.
3 If the recharged battery discharges rapidly if
left disconnected it is likely that an internal short
caused by physical damage or sulphation has
* Equipment'in the
occurred. A new battery will be required. A sound
item will tend to lose its charge at about 1 % per
day.
4.2 If the charger doesn't have ammeter
built in, connect one in series as shown.
DO NOT connect the ammeter between the
battery terminals or it will be ruined
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