Tennant 235, Operator'S Manual

Page: 60 / 82

MAINTENANCE
235 MM166 (3--93)
3-24
ELECTRICAL SYSTEM
BATTERY
The battery used in this machine is rated at 12 V,
330 ccA. It is located in the front left of the
machine behind the hopper. When removing
battery cables, remove the negative (--) cable
before the positive (+) cable.
Clean the top surface and the terminals of the
battery periodically. Use a strong solution of
baking soda and water. Brush the solution
sparingly over the battery top, terminals, and
cable clamps. Do not allow any baking soda
solution to enter the battery. Use a wire brush to
clean the terminal posts and the cable
connectors. After cleaning, apply a coating of
clear petroleum jelly to the terminals and the
cable connectors. Keep the top of the battery
clean and dry.
Keep all metallic objects off the top of the battery,
as they may cause a short circuit. Replace worn
or damaged wires.
The electrolyte level in regular nonsealed
batteries can be checked. It must always be
above the battery plates. Add distilled water to
maintain solution at the correct level above the
plates, but do not overfill. Never add acid to
batteries, only water. Keep vent plugs firmly in
place at all times, except when adding water or
taking hydrometer readings.
FOR SAFETY: When Servicing Machine, Avoid
Contact With Battery Acid.
If when checking battery specific gravity, one or
more battery cells tests lower than the other
battery cells, (0.050 or more) the cell is damaged,
shorted, or is about to fail.
NOTE: Do not take readings immediately after
adding water----if the water and acid are not
thoroughly mixed, the readings may not be
accurate. Check the hydrometer readings against
this chart:
SPECIFIC GRAVITY BATTERY
AT 80
_
F (27
_
C) CONDITION
1.265 100% charged
1.225 75% charged
1.190 50% charged
1.155 25% charged
1.120 Discharged
NOTE: If the readings are taken when the battery
electrolyte is any temperature other than 80
_
F
(27
_
C), the reading must be temperature
corrected.
To determine the corrected specific gravity
reading when the temperature of the battery
electrolyte is other than 80
_
F (27
_
C):
Add to the specific gravity reading 0.004
(4 points) for each 10
_
F (6
_
C) above
80
_
F (27
_
C).
Subtract from the specific gravity reading
0.004 (4 points) for each 10
_
F (6
_
C) below
80
_
F (27
_
C).