Toro Groundsmaster 5900 Series Service Manual page 405

Battery Inspection, Maintenance, and Testing
Groundsmaster ® 5900 & 5910
16227SL Rev B
1. Perform following inspections and maintenance:
A. Check battery case for cracks. Replace battery if cracked or leaking.
B. Check battery terminal posts for corrosion. Use wire brush to clean
corrosion from posts.
Before cleaning the battery, tape or block vent holes.
C. Check for signs of wetness or leakage on the top of the battery which
might indicate overcharging or a loose terminal post. Also, check battery
case for dirt and oil. Clean the battery with a solution of baking soda and
water, then rinse it with clean water.
D. Check that the cover seal is not broken. Replace the battery if the seal
is broken or leaking.
2. Perform a high−discharge test with an adjustable load tester.
This is one of the most reliable means of testing a battery as it simulates the
cold−cranking test. A commercial battery load tester is required to perform
this test.
Follow the load tester manufacturer's instructions when using a
battery load tester.
A. Check the voltage across the battery terminals prior to load testing the
battery. If the voltage is less than 12.4 VDC, charge 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
manufacturer's instructions.
C. Make sure battery terminals are free of corrosion.
D. Connect a battery load tester to the battery terminals following the load
tester manufacturer's instructions. Connect a digital multimeter to the
battery terminals.
E. Apply a test load equal to one half the Cranking Performance rating of
the battery for 15 seconds.
F. Take a battery voltage reading at 15 seconds, then remove the test load.
This reading is the test voltage.
Minimum Voltage
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
IMPORTANT
CAUTION
Battery Temperature
70 ºF (and up)
60 ºF
50 ºF
40 ºF
30 ºF
20 ºF
10 ºF
0 ºF
Page 6–143
21.1 ºC (and up)
15.6 ºC
10.0 ºC
4.4 ºC
−1.1 ºC
−6.7 ºC
−12.2 ºC
−17.8 ºC
Electrical System: Service and Repairs