John Deere stx38 - Manual (Page 147)

3/21/97
4 - 63
ELECTRICAL TESTS AND ADJUSTMENTS
BATTERY TEST
Reason:
To check condition of battery and determine battery
voltage.
Equipment:
• Hydrometer
• Voltmeter or JTO5685 Battery Tester
Procedure:
1. Clean battery terminals and top of battery.
2. Inspect battery terminals and case for breakage or
cracks.
3. Check electrolyte level in each battery cell. Add
clean, soft water as needed. If water was added,
charge battery for 20 minutes at 10 amps.
4. Remove surface charge by placing a small load on
the battery for 15 seconds.
5. Check specific gravity of each cell with a
hydrometer.
6. Check battery voltage with voltmeter or JTO5685
Battery Tester.
Specifications:
Minimum specific gravity
. . . . . . . . . 1.225 with less than 50 point variation
Minimum battery voltage. . . . . . . . . . . . . . 12.4 volts
Results:
• Battery voltage less than 12.4 VDC, charge battery.
• Battery voltage more than 12.4 VDC, test specific
gravity.
• All cells less than 1.175, charge battery at 10 amp
rate.
• All cells less than 1.225 with less than 50 point
variation, charge battery at 10 amp rate.
• All cells more than 1.225 with less than 50 point
variation, load test battery.
• More than 50 point variation: replace battery.
CHARGE BATTERY
Reason:
To increase battery charge after battery has been
discharged.
Equipment:
• Battery charger (variable rate)
Procedure:
NOTE: See BATTERY TEST in this group before
charging battery.
1. Connect variable rate charger to battery.
NOTE: Maximum charge time at boost setting is 10
minutes. Allow additional 5 minutes for each 10
degrees below 70 degrees F.
2. Start charger at slow rate. Increase charge rate one
setting at a time. Check charger ammeter after 1
minute at each setting. Maintain 10 amp charge
rate. Use boost setting as necessary.
Continued on next page
M49596
M49598