John-deere stx38 User Manual download pdf (Page 148)

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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

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John-deere stx38 User Manual Page 148

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