Toro Groundsmaster 4000-D Service Manual page 211

Battery Charging
To minimize possible damage to the battery and allow
the battery to be fully charged, the slow charging meth-
od is presented here. This charging method can be ac-
complished with a constant current battery charger
which is readily available.
CAUTION
Follow the manufacturer's instructions when us-
ing a battery charger.
NOTE: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1. Determine the battery charge level from either its
specific gravity or open circuit voltage.
Battery Charge Specific
Level Gravity
100% 1.265
75% 1.225
50% 1.190
25% 1.155
0% 1.120
2. Determine the charging time and rate using the
manufacturer's battery charger instructions or the
following table.
Battery Battery Charge Level
Reserve (Percent of Fully Charged)
Capacity Capacity
75% 50%
(Minutes)
80 or less 3.8 hrs 7.5 hrs
@
3 amps 3 amps
81 to 125 5.3 hrs 10.5 hrs
@
4 amps 4 amps
126 to 5.5 hrs 11 hrs
170 @
5 amps 5 amps
171 to 5.8 hrs 11.5 hrs
250 @
6 amps 6 amps
above 6 hrs 12 hrs
250 @
10 amps 10 amps
Groundsmaster 4000--D
Open Circuit
Voltage
12.68
12.45
12.24
12.06
11.89
25% 0%
11.3 hrs 15 hrs
@ @ @
3 amps 3 amps
15.8 hrs 21 hrs
@ @ @
4 amps 4 amps
16.5 hrs 22 hrs
@ @ @
5 amps 5 amps
17.3 hrs 23 hrs
@ @ @
6 amps 6 amps
18 hrs 24 hrs
@ @ @
10 amps 10 amps
Page 5 - - 37
CAUTION
Do not charge a frozen battery because it can ex-
plode and cause injury. Let the battery warm to
o o
60 F (15.5 C) before connecting to a charger.
Charge the battery in a well- -ventilated place to
dissipate gases produced from charging. These
gases are explosive; keep open flame and elec-
trical spark away from the battery. Do not smoke.
Nausea may result if the gases are inhaled. Un-
plug the charger from the electrical outlet before
connecting or disconnecting the charger leads
from the battery posts.
3. Following the battery charger manufacturer's
instructions, connect the charger cables to the battery.
Make sure a good connection is made.
4. Charge the battery following the battery charger
manufacturer's instructions.
5. Occasionally check the temperature of the battery
electrolyte. If the temperature exceeds 125
or the electrolyte is violently gassing or spewing, the
charging rate must be lowered or temporarily stopped.
6. Three (3) hours prior to the end of the charging, mea-
sure the specific gravity of a battery cell once per hour.
The battery is fully charged when the cells are gassing
freely at a low charging rate and there is less than a
0.003 change in specific gravity for three consecutive
readings.
o o
F (51.6 C)
Electrical System