C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cellspecificgravityislessthan1.225,chargethebat-
tery. Charge at the recommended rate and time giv-
en in Charging or until all cells specific gravity is
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
Minimum
Voltage
Battery Electrolyte
Temperature
1.225
orgreater withthedifferenceinspecificgravity
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
21.1oC (and up)
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.
60oF
50oF
15.6oC
10.0oC
3.
Perform a high--discharge test with an adjustable
load tester.
40oF
30oF
4.4oC
--1.1oC
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
20oF
10oF
0oF
--6.7oC
--12.2oC
--17.8oC
CAUTION
I. If the test voltage is below the minimum, replace
the battery. If the test voltage is at or above the mini-
mum, return the battery to service.
Follow the manufacturer’s instructions when us-
ing a battery tester.
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.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4
VDC, recharge the battery.
B. If the battery has been charged, apply a 150 amp
load for 15 seconds to remove the surface charge.
Use a battery load tester following the manufactur-
er’s instructions.
CAUTION
C. Make surebattery terminals arefreeofcorrosion.
D. Measure the temperature of the center cell.
Follow the manufacturer’s instructions when us-
ing a battery charger.
E. Connect a battery load tester to the battery termi-
nals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
NOTE: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1.
specific gravity or open circuit voltage.
Determine the battery charge level from either its
F. Apply a test load of one half the Cranking Perfor-
mance (see Battery Specifications) rating of the bat-
tery for 15 seconds.
Battery Charge
Level
Specific
Gravity
Open Circuit
Voltage
G. Take a voltage reading at 15 seconds, then re-
move the load.
100%
75%
50%
25%
0%
1.265
1.225
1.190
1.155
1.120
12.68
12.45
12.24
12.06
11.89
Groundsmaster 4500--D/4700--D
Page 5 -- 29
Electrical System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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