John Deere 318 - Manual (Page 322)

‘
STARTING CIRCUIT
TESTS
Listed at right are
symptoms that may
occur in a
malfunctioning starting
circuit. Locate the
symptom that applies,
then proceed to the
appropriate test.
IMPORTANT: Test
battery and verify
grounds before
testing starting
circuit. (See steps
A
and
B
at the
beginning of this
group.)
STARTING CIRCUIT SYMPTOMS:
—Starter Operates, But Doesn’t
Crank Engine: REPAIR STARTER
(See CTM2.)
—Solenoid Doesn’t Click, Starter
Doesn’t Operate:
For Machines:
316 (S.N. —362983)
318 (S.N. —364137)
420 (S.N. —360009)
GO TO
2a
For Machines:
316 (S.N. 362984— )
318 (S.N. 364138— )
420 (S.N. 360010— )
GO TO
2c
—Solenoid Clicks, Starter
Doesn’t Operate:
For Machines:
316 (S.N. —362983)
318 (S.N. —364137)
420 (S.N. —360009)
GO TO
2b
For Machines:
316 (S.N. 362984— )
318 (S.N. 364138— )
420 (S.N. 360010— )
GO TO
2d
—Starter Cranks Engine Slowly
Or Erratically: GO TO
Æ
,
Group 25.
2a
Starter Test—
For Machines:
316 (SN —362983)
318 (SN —364137)
420 (SN —360009)
Remove battery base to
access solenoid.
Set battery on air
cleaner base, then
reroute negative (—)
battery cable to
connect.
PTO switch OFF.
Key switch OFF.
Hydrostatic lever in
N/STOP position.
Park brake engaged.
M37179 -UN-25JAN90
Disconnect spark plug
wires from spark plugs
and ground to engine
block.
M37165 -UN-25JAN90
Disconnect small purple wire (A) from solenoid.
Connect one end of a jumper wire to the
exposed terminal, then briefly touch other end of
jumper to battery cable terminal (B).
LISTEN: Starter must operate.
STARTER OPERATES:
GO TO
2e
STARTER DOESN’T
OPERATE: GO TO
2b
2b
Starter Solenoid
Test—For
Machines:
316 (SN —362983)
318 (SN —364137)
420 (SN —360009)
PTO switch OFF.
Key switch OFF.
Hydrostatic lever in
N/STOP position.
Park brake engaged.
Spark plug wires
disconnected and
grounded.
M37166 -UN-25JAN90
Briefly jump between
the two large terminals
(A), located on the
starter solenoid.
LISTEN: Starter must
operate.
STARTER OPERATES:
Replace solenoid, then
GO TO
‘
group 05.
STARTER DOESN’T
OPERATE: Check
battery and starter
wiring connections, then
GO TO
Æ , Group 25.
MX,159024025,29-19-16MAY95
MX,159024025,30-19-16MAY95
MX,159024025,31-19-16MAY95
Electrical System Diagnosis/Starting Circuit Tests
TM1590 (17MAY95)
240-20-10
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
10