John Deere stx38 - Manual (Page 148)

4 - 64
3/21/97
TESTS AND ADJUSTMENTS ELECTRICAL
3. Check if battery is accepting a 10 amp charge after
10 minutes at boost setting.
Battery will not accept 10 amp charge after 10
minutes at boost setting: replace battery.
Battery is accepting 10 amp charge after 10 minutes
at boost setting, and battery did not need water:
go to steps 6 and 7.
Battery is accepting 10 amp charge after 10 minutes
at boost setting, but battery did need water or all
cells were below 1.175: go to steps 4 and 5.
4. Set charger at 15—25 amps.
IMPORTANT: Decrease charge rate if battery
gases or bubbles excessively or becomes too
warm to touch.
5. Check specific gravity after 30 minutes (60 minutes
for maintenance-free battery).
More than 50 point variation between cells: replace
battery.
Less than 50 point variation between cells: go to
steps 6 and 7.
NOTE: If battery was discharged at slow or unknown
rate, charge at 10—15 amps for 6—12 hours.
(Maintenance-free battery: 12—24 hours.) If
battery was discharged at fast rate, charge at
20—25 amps for 2—4 hours. (Maintenance-
free battery: 4—8 hours.)
6. Continue charging battery until specific gravity is
1.230—1.265 points.
7. Load test battery.
BATTERY LOAD TEST
Reason:
To check condition of battery under load.
Equipment:
• JTO5685 Battery Tester
Connections:
1. Turn load knob (C) of tester counter-clockwise to
off.
2. Connect tester positive cable (D) to battery positive
terminal.
3. Connect tester negative cable (E) to battery
negative terminal.
Procedure:
1. Turn load knob of tester clockwise until amperage
reading (A) is equal to:
• Cold cranking amperage rating (use blue scale).
— OR —
• Three times ampere hour rating (use black scale).
2. Hold for 15 seconds and turn load knob of tester off.
3. Repeat procedure steps 1 and 2 from above and
read condition of battery at DC Volts scale (B).
Results:
• If the battery does not pass the test and has not
been charged, charge battery and retest.
• If the battery does not pass the test and has been
charged, replace the battery.
M49597
C
D
E
B
A