Toro Groundsmaster 3505-D Service Manual page 163

6. Connect a digital multimeter (set to amps) between
the negative (--) battery post and the negative (--)
(ground) cable connector. The reading should be less
than 0.1 amp. If the reading is 0.1 amp or more, the unit's
electrical system should be tested and repaired.
7. Connect negative (--) (ground) cable connector to
the negative (--) battery post. Tighten cap screw and lock
nut with two wrenches.
8. Apply battery terminal protector (Toro Part No.
107--0392) or a light coat of grease on all battery posts
and cable connectors to reduce corrosion after connec-
tions are made.
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 available in most shops.
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:
Groundsmaster 3505--D
Battery
Reserve
Capacity Capacity
(Minutes)
80 or less
81 to 125
126 to
170
171 to
250
above
250
Do not charge a frozen battery because it can ex-
plode and cause injury. Let the battery warm to
o
60
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.
Open Circuit
Voltage
3. Following the manufacturer's instructions, con-
12.68
nect the charger cables to the battery. Make sure a good
12.45
connection is made.
12.24
4. Charge the battery following the manufacturer's
12.06
instructions.
11.89
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 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.
Page 5 - - 25
Battery Charge Level
(Percent of Fully Charged)
75% 50%
3.8 hrs 7.5 hrs
@ @
3 amps 3 amps
5.3 hrs 10.5 hrs
@ @
4 amps 4 amps
5.5 hrs 11 hrs
@ @
5 amps 5 amps
5.8 hrs 11.5 hrs
@ @
6 amps 6 amps
6 hrs 12 hrs
@ @
10 amps 10 amps
CAUTION
o
F (15.5 C) before connecting to a charger.
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
o o
F (51.6 C)
Electrical System