Alternator, tests – John Deere 318 User Manual

Page 345

Advertising
background image

3f

Solenoid Shift
Starter—No Load
Amp Draw Test

M77937 -UN-17JAN95

Mount starter in a vise
and connect to a
battery as instructed in
step

3d

With starter running,
check amperage with
JT05712 Current Gun
(A).

Starter should draw 53
amps or less at 7000
rpm.

AMPERAGE 53 OR
LESS: Starter OK.
Malfunction is in wiring
on machine. Check all
connections and
grounds.

AMPERAGE MORE
THAN 53: Repair or
replace starter. (See
CTM2.)

Å

ALTERNATOR TEST
FOR REGULATED
CURRENT OUTPUT

IMPORTANT: Poor connections and grounds
contribute to a large portion of the problems
associated with the charging system. Verify
that all system connections and grounds are
good before replacing any parts. Make sure
battery cable connections are clean and tight.

M37205 -UN-25JAN90

Disconnect and ground spark plug wires.

Discharge battery by cranking engine for 10—15
seconds.

NOTE: Be sure selector switch on current gun is
set for DC current and current direction arrow on
gun is pointing in the correct direction.

Connect JT05712 Current Gun (A) over white
wire with red stripe, connected to B+ terminal on
regulator.

Connect a voltmeter to battery positive (+) and
negative (—) terminals.

Connect spark plug wires to spark plugs.

NOTE: The maximum current (unregulated)
output for the 316-P218G engine and all 318 and
420 engines is 20 amps.

The maximum current (unregulated) output of the
316-B43E engine is 15 amps.

Start engine and run at full throttle. Observe
meters. Ammeter should start at a high output
until the battery voltage comes up to 13.8—14.7.

After voltage reaches 13.8—14.7, the amp output
should start to decrease.

AMP OUTPUT DOES
NOT DECREASE,
BATTERY VOLTAGE
GOES ABOVE 15:
Replace regulator.

AMP OUTPUT IS HIGH
BUT BATTERY
VOLTAGE DOES NOT
INCREASE: Battery is
bad or connections or
grounds are bad.

AMP OUTPUT IS LOW
BUT BATTERY
VOLTAGE
EVENTUALLY
INCREASES: GO TO

4a

MX,159024030,11-19-16MAY95

MX,159024030,12-19-16MAY95

Electrical System Component Tests and Adjustments/Alternator and Regulator/Rectifier Tests

TM1590 (17MAY95)

240-25-5

316, 318 & 420 Lawn and Garden Tractors

020895

240

25

5

Advertising
This manual is related to the following products:

316, 420