John Deere 318 - Manual (Page 333)

3m
Main Power Test
for TDC Module
Turn key switch to RUN
position.
M37173 -UN-25JAN90
At both sides of TDC
8-pin connector, check
for voltage at terminal
with pink and purple
wires and terminal with
single purple wire (A). VOLTAGE: Verify good
ground at TDC 2-pin
connector, then GO TO
3n
VOLTAGE AT ONE
TERMINAL: Repair
connector, then GO TO
Æ
, Group 05.
NO VOLTAGE: GO TO
1a
3n
Starter (Interlock)
Circuit Voltage Test
at TDC Module
PTO switch OFF.
Hydrostatic lever in
N/STOP position.
NOTE: Engaged park
brake required on
machines:
316 (S.N. 596121— )
318 (S.N. 600305— )
420 (S.N. 595881— )
Engage park brake.
Turn key switch to RUN
position.
M37173 -UN-25JAN90
Check for voltage at
purple/black leads (A)
at TDC 8-pin connector. VOLTAGE BOTH
LEADS: Verify ground
at 2-pin connector. If
OK; replace TDC
module.
VOLTAGE ONE LEAD:
Repair connector.
NO VOLTAGE:
Purple/black wire to key
switch is open or there
is an opening in the
starter interlock circuit.
GO TO
2e
Å
PTO CLUTCH AND
LAMP TEST
Listed at right are
symptoms that may
occur if the PTO clutch
circuit malfunctions.
Locate the symptom
that applies, then
proceed to the
appropriate test.
PTO CLUTCH CIRCUIT
SYMPTOMS:
—PTO Lamp Does Not Come
On, But Clutch Engages: GO
TO
4a
—PTO Lamp Burns Out
Frequently: GO TO
4b
—PTO Lamp Comes On, But
Clutch Doesn’t Engage: GO TO
4c
—PTO Lamp Does Not Come
On And Clutch Doesn’t Engage:
GO TO
4e
—PTO Does Not Disengage When
Operator Raises From The
Seat For Approximately
1 Second Or More: GO TO
4f
—PTO Clutch Slips: GO TO
Ö
,
Group 25.
MX,159024025,54-19-16MAY95
MX,159024025,55-19-16MAY95
MX,159024025,56-19-16MAY95
Electrical System Diagnosis/PTO Clutch and Lamp Tests
TM1590 (17MAY95)
240-20-21
316, 318 & 420 Lawn and Garden Tractors
020895
240
20
21