72
Charge condition
Check the batteries’ charge condition using a hydrom-
eter. The battery electrolytic density should be 1.28 g/
cm
3
.* Charge battery if reading has dropped to 1.24 g/
cm
3
* (approximately 75% charge).
Note. If an aerometer-type hydrometer (see illustra-
tion) is used, the value read off applies at a tempera-
ture of approx. +25°C (77°F). At other temperatures
the reading must be compensated as follows:
at –20°C (–4°F)
compensate by –0.03
at –5°C (23°F)
compensate by –0.02
at +10°C (50°F)
compensate by –0.01
at +40°C (104°F)
compensate by +0.01
Example: A value of 1.24 measured at –5°C (23
°
F)
should be corrected to 1.22 which requires extra
charging.
Note. An optical-type hydrometer is temperature
compensated.
The various battery cells should display relatively
even values. Uneven results may mean that the
battery is more or less ready for replacement.
* Note. For batteries with tropical acid substitute 1.24 g/cm
3
, and
1.20 g/cm
3
.
Aerometer-type
Optical-type
Hydrometers
TAMD71B: Fuel shut-off valve fuse
Checking batteries and electrical
connections
Read the section entitled “Electrical system –
Important” on pages 69–70.
The service life of your batteries depends largely on
how they are maintained. Keep batteries dry and
clean. Dirt on the batteries may cause tracking and
discharge them, particularly in damp weather.
Clean the battery terminals and connections using
suitable wire brushes. Poor contact may cause
unnecessary voltage drops. Tighten the cable termi-
nals well and spray the battery terminals and connec-
tions with anti-corrosive agent or coat them with
Vaseline.
Check that the batteries are connected properly.
Also check that all other electrical connections are dry
and free of oxidation and that there are no loose
connections. If necessary, spray these connections
with a water-repellent spray (Volvo Penta Universal
oil).
Cleaning the battery terminals
Fuel shut-off valve fuse*
1. Stop the engine and break the circuit using the
main switches.
2. Detach the terminal box and pull it out.
3. Dismantle the fuse holder and replace the fuse
with a new one (8A). See illustration.
4. Reinstall the terminal box.
* Note. For TAMD71B engines.
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Summary of Contents for TAMD63L
Page 1: ...INSTRUCTION BOOK TAMD63L P TAMD71B TAMD73P WJ TAMD74C L P ...
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Page 124: ...7740156 0 English 6 2000 AB Volvo Penta SE 405 08 Göteborg Sweden www volvopenta com ...