JOHN DEERE T-630 Farm Tractor Installation Guide
- June 16, 2024
- John Deere
Table of Contents
JOHN DEERE T-630 Farm Tractor Installation Guide
Troubleshooting
The T-630 is equipped with a digital readout located in the “Gray Box” on the right side of the engine compartment. This diagnostic gauge gives hours, temperature, RPM, and a number of other items of regular information. In the event of a shut down or failure to start, service codes will be displayed. Before turning the key off, read the displays service codes which can be looked up in the John Deere manual received in the T-630 owner’s manual.
The “Gray Box” serves as the junction box between John Deere and the shut down devices external to the John Deere installed on the T-630 as well as the key on/off and engine start signal.
The battery lead to the ECU on the John Deere is fused. Fuses are located in the Deere wiring harness on the right side of the engine down in the engine compartment. Within the Gray Box, terminal B should have 12v power at all times. Check fuses if not.
The fault code received if a T-630 sensor shuts down the engine is: SPN 970 – FMI 31 – Auxiliary Engine Shutdown Switch Active. Three functions on the T-630 will give this code:
- The E-Stop
- Low water (radiator) level sensor
- Low Hydraulic level sensor
All other codes are originated from John Deere and your nearest John Dealer is the best resource for trouble shooting.
In the event of an ECU shut down, re-set the ECU by turning the key off for 20 seconds after recording fault codes or the engine will not re-start.
Frequently asked questions:
| Symptom: | Check: |
|---|---|
| Diagnostic Gauge lights do not come on when switch is turned on | Check in-line |
fuses in John Deere Wiring Harness. (right side of engine, low in compartment)
No power on terminal B ofGray Box| Check in-line fuses in John Deere Wiring
Harness. (right side of engine, low incompartment)
Engine Diagnostic lights, but engine does not even try to start (starter does
notengage at all)| Refer to flow chart
Engine starts and runs forabout 30 seconds, but then quits.| Refer to flow
chart
Engine tries to shut downwhen turning left| Water low in radiator or overflow
bottle is empty. Must be water in overflowbottle.
Engine tries to shut down going straight over bumpy surface| Probably low
Hydraulic level.
Engine start and runs for 30seconds with E-Stop in.| This is normal.
Tuckerbilt T-630 Electronic Engine Controls wiring: Gray junction box to John Deere Harness.
23 Pin Connector (lower of the 2 connectors from the Gray Box to JD harness)
Pin| Circuit No.| Color| Wire Gauge| Description| Comments
A| n/a| | | Not used|
B| n/a| | | Not used|
C| n/a| | | Not used|
D| n/a| | | Not used|
E| n/a| | | Not used|
F| n/a| | | Not used|
G| n/a| | | Not used|
H| n/a| | | Not used|
J| n/a| | | Not used|
K| 941| Brown| 16| External shutdown input| Input from T-630 Auxiliary
functions to the John Deere ECU to shut down. 3 functions on the T-630
complete this circuit.Low Water Level – is water in the overflow bottle? This
can be unplugged to test.
Low Hydraulic Level – disconnect K or Q of the oil sensor leads on the bottom
terminal strip to test.
The E-Stop – disconnect either wire on the E-Stop Contact to test.All T-630
Auxiliary signals can be removed from the circuit temporarily for testing by
disconnecting the 23 pin connector. (it is the lower of the two connectors)
L| n/a| | | Not used|
M| n/a| | | Not used|
N| n/a| | | Not used|
O| n/a| | | Not used|
P| n/a| | | Not used|
Q| 012| Red| 16| Switched Power (12v)| Only active when switch is on. Power
connection for the External Shutdown (Pin K) circuits.
R| n/a| | | Not used|
S| n/a| | | Not used|
T| n/a| | | Not used|
U| n/a| | | Not used|
V| n/a| | | Not used|
W| n/a| | | Not used|
X| 050| Black| 16| SystemGround| General system ground. Not for sensor return.
Tuckerbilt T-630 Electronic Engine Controls wiring: Gray junction box to John Deere Harness.
21 Pin Connector (upper of the 2 connectors from the Gray Box to JD harness)
Pin| Circuit No.| Color| Wire Gauge| Description| Comments
Std.| Ext.
A| n/a| | | Not used|
B| 022| 032| Red| 12| Fused Un-switched Battery Power| To “B” terminal of gray
box. In-Line Fuse in JD harness hanging low.
C| n/a| | | Not used|
D| 422| 422| Red| 12| Starter Relay| To “Start Button”. When start button
pushed, 12v must flow throughterminal 4, through Neutral Start on Pump to
Terminal D into ECU harness.
E| 050| 050| Black| 18| Ground| Grounded on the engine side of the battery.
F| 020| 020| Black| 18| CAN Shield| To any CAN connectors including the
diagnostic gauge.
G| 012| 012| Red| 12| Battery Power to ECU (Switched)| Wired to the “Ignition”
terminal of the Key Switch.
H| n/a| | | Not used|
J| 412| 412| Red| 18| Alternatorignition| Under terminal “G” (Switched Power)
K| n/a| | | Not used|
L| n/a| | | Not used|
M| n/a| | | Not used|
N| n/a| | | Not used|
O| n/a| | | Not used|
P| n/a| | | Not used|
R| 947| 947| Violet| 18| Throttle Switch| Throttle common
S| 914| 914| Yellow| 18| Sensor Return| Throttle Sensor Return
T| Plug| 936| Blue| 18| Bump SpeedDown| Not currently used
U| 905| 905| Green| 18| CAN Low| Diagnostic Gauge
V| 904| 904| Yellow| 18| CAN High| Diagnostic Gauge
W| Plug| 955| Green| 18| Bump Speed Up| Not currently used
X| Plug| 923| Orange| 18| Bump Enable| Not currently used
WAIRENG DIGRAME
| ITEM NO. | PART NUMBER | DESCRIPTION | QTY. |
|---|---|---|---|
| 1 | 8197313 | Wire, T-630 JD4045T 23 Pin ECU | 1 |
| 2 | E122 | Terminal Vi Spade (8-st) 22-16 | 3 |
| 3 | E784 | Loom Wire 13/32 | 1 |
| 4 | 80575-114 | Ladd Strain Relief Shell Size 24 | 1 |
| 5 | 38RH | 3&’ Red Rubber hose | 1 |
| 6 | TY-570 | Tie Wrap | 1 |
| 7 | 80575-101 | Plastic Plug, 23 Pin | 1 |
| 8 | 832-34RHMS | Screw Rh Mach. 8-32x 3/4 | 1 |
| 9 | 832SLN | Nut Self-lock 8-32 | 1 |
| 10 | 80575-104 | Plug, Sealing Size 12-16 | 20 |
| 11 | 80575-103 | Socket, Stamped & Forged # 16-18 | 3 |
PARTS
One Required Per Unit
| ITEM NO. | PART NUMBER | DESCRIPTION | QTY. |
|---|---|---|---|
| 1 | 8197313 | Wire, T-630 JD4045T 23 Pin ECU | 1 |
| 2 | E122 | Terminal Vi Spade (8-st) 22-16 | 3 |
| 3 | E784 | Loom Wire 13/32 | 1 |
| 4 | 80575-114 | Ladd Strain Relief Shell Size 24 | 1 |
| 5 | 38RH | 3&’ Red Rubber hose | 1 |
| 6 | TY-570 | Tie Wrap | 1 |
| 7 | 80575-101 | Plastic Plug, 23 Pin | 1 |
| 8 | 832-34RHMS | Screw Rh Mach. 8-32x 3/4 | 1 |
| 9 | 832SLN | Nut Self-lock 8-32 | 1 |
| 10 | 80575-104 | Plug, Sealing Size 12-16 | 20 |
| 11 | 80575-103 | Socket, Stamped & Forged # 16-18 | 3 |
**PARTS
**
T-630 John Deere Engine with ECU Trouble Shooting
T-630 John Deere Engine with ECU Trouble Shooting
