Toro Greensmaster 3120 - Page 221

Inspecting,Maintaining,andTestingtheBattery(continued)
inspecicgravitybetweenthehighestandlowestcellbeinglessthan
0.050.Ifyoucannotmeetthesechargingconditions,replacethebattery.
3.Doahigh-dischargetestwithanadjustableloadtester.Thisisaveryreliable
meansoftestingabatteryasitsimulatesthebatterycold-crankingcapacity.
Acommercialbatteryloadtesterisrequiredtodothistest.
CAUTION
Followthemanufacturer'sinstructionswhenusingabatteryload
tester.
A.Checkthevoltageacrossthebatteryterminalsbeforetestingthebattery.
Ifthevoltageislessthan12.0VDC,chargethebatterybeforecontinuing
thetest.
B.Ifyouchargethebattery,applya150Aloadfor15secondstoremove
thesurfacecharge.Useabatteryloadtesterfollowingthemanufacturer's
instructions.
C.Ensurethatthebatteryterminalsarefreeofcorrosion.
D.Measuretheelectrolytetemperatureofthecentercell.
E.Connectabatteryloadtestertothebatteryterminalsfollowingthe
manufacturer'sinstructions.Connectadigitalmultimetertothebattery
terminals
F.Applyatestloadof1/2thecoldcrankingamperageratingofthebattery;
refertoBatterySpecications(page5–31).
G.Takeatestvoltagereadingwhilestillunderloadafter15seconds,then
immediatelyremovetheload.
H.UseMinimumVoltage(page5–33)todeterminetheminimumvoltagefor
thecentercellelectrolytetemperaturereading.
I.Ifthetestvoltageisbelowtheminimum,replacethebattery.Ifthetest
voltageisatorabovetheminimum,returnthebatterytoservice.
ChargingtheBattery
BatteryChargeLevel
BatteryChargeLevelSpecicGravityOpenCircuitVoltage
100%
1.26512.68
75%
1.22512.45
50%
1.19012.24
25%
1.15512.06
0%
1.12011.89
BatteryChargeRate
BatteryChargeLevel(PercentofFullyCharged)
Battery
Reserve
Capacity
(Minutes)
75%50%25%0%
80orless
3.8hrs@3A7.5hrs@3A11.3hrs@3A15hrs@3A
81to125
5.3hrs@4A10.5hrs@4A15.8hrs@4A21hrs@4A
Greensmaster3120
Page5–35
ElectricalSystem:ServiceandRepairs
17230SLRevC