T-630 Farm Tractor

Product Information

Specifications

• Model: T-630

• Engine: John Deere Electronic Engines

• Diagnostic Gauge: Digital readout located in the Gray Box on
  the right side of the engine compartment

• Information Displayed: Hours, temperature, RPM, and other
  regular information

• Service Codes: Displayed in the event of a shut down or failure
  to start

• Battery Lead to ECU: Fused

• Fuses Location: Deere wiring harness on the right side of the
  engine compartment

• Terminal B: Should have 12v power at all times

• External Shutdown Functions: 3 shutdown functions on the T-630
  connected to John Deere ECU through Pin K (941)

Product Usage Instructions

1. Troubleshooting and Service Codes

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 provides hours, temperature, RPM, and other regular
information. In the event of a shut down or failure to start,
service codes will be displayed. Before turning off the key, read
the displayed service codes which can be looked up in the John
Deere manual received in the T-630 owner’s manual.

2. Gray Box and Junction Box

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.

3. Battery Lead and Fuses

The battery lead to the ECU on the John Deere is fused. The
fuses are located in the Deere wiring harness on the right side of
the engine compartment. Within the Gray Box, terminal B should have
12v power at all times. If not, check the fuses.

4. ECU Reset

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: Diagnostic Gauge lights do not come on when switch is

turned on

Check: Check in-line fuses in John Deere Wiring Harness (right
side of engine, low in compartment)

Symptom: No power on terminal B of Gray Box Engine Diagnostic

lights, but engine does not even try to start (starter does not
engage at all)

Check: Check in-line fuses in John Deere Wiring Harness (right
side of engine, low in compartment)

Symptom: Engine starts and runs for about 30 seconds, but then

quits

Check: Refer to flow chart

Symptom: Engine tries to shut down when turning left

Check: Refer to flow chart

Symptom: Engine tries to shut down going straight over bumpy

surface

Check: Water low in radiator or overflow bottle is empty. Must
be water in overflow bottle. Probably low Hydraulic level.

Symptom: Engine starts and runs for 30 seconds with E-Stop

in

Check: This is normal.

Additional Resources

For more detailed information and support, please refer to the
Tuckerbilt T-630 Electronic
Engine Controls Wiring Manual.

FAQ

1. Symptom: Diagnostic Gauge lights do not come on when switch is

   turned on

Check: Check in-line fuses in John Deere Wiring Harness (right
side of engine, low in compartment)

2. Symptom: No power on terminal B of Gray Box Engine Diagnostic

   lights, but engine does not even try to start (starter does not
   engage at all)

Check: Check in-line fuses in John Deere Wiring Harness (right
side of engine, low in compartment)

3. Symptom: Engine starts and runs for about 30 seconds, but then

   quits

Check: Refer to flow chart

4. Symptom: Engine tries to shut down when turning left

Check: Refer to flow chart

5. Symptom: Engine tries to shut down going straight over bumpy

   surface

Check: Water low in radiator or overflow bottle is empty. Must
be water in overflow bottle. Probably low Hydraulic level.

6. Symptom: Engine starts and runs for 30 seconds with E-Stop

   in

Check: This is normal.

T-630 with John Deere Electronic Engines 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:

1. The E-Stop 2) Low water (radiator) level sensor 3) 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: Diagnostic Gauge lights do not come on when switch is turned on No power on terminal B of Gray Box Engine Diagnostic lights, but engine does not even try to start (starter does not engage at all) Engine starts and runs for about 30 seconds, but then quits. Engine tries to shut down when turning left Engine tries to shut down going straight over bumpy surface Engine start and runs for 30 seconds with E-Stop in.

Check: Check in-line fuses in John Deere Wiring Harness. (right side of engine, low in compartment) Check in-line fuses in John Deere Wiring Harness. (right side of engine, low in compartment) Refer to flow chart
Refer to flow chart
Water low in radiator or overflow bottle is empty. Must be water in overflow bottle. Probably low Hydraulic level.
This is normal.

Tractor Manuals PDF

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

Description Comments

Gauge

A

n/a

B

n/a

C

n/a

D

n/a

E

n/a

F

n/a

G

n/a

H

n/a

J

n/a

Not used Not used Not used Not used Not used Not used Not used Not used Not used

K 941

Brown 16

External

Input from T-630 Auxiliary functions to the John Deere ECU to shut down. 3

shutdown functions on the T-630 complete this circuit.

input

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.

L

n/a

M

n/a

N

n/a

O

n/a

P

n/a

Q 012

R

n/a

S

n/a

T

n/a

U

n/a

V

n/a

W

n/a

X 050

Red 16 Black 16

Not used Not used Not used Not used Not used
Switched Power (12v)
Not used Not used Not used Not used Not used Not used
System Ground

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)
Only active when switch is on. Power connection for the External Shutdown (Pin K) circuits.
General system ground. Not for sensor return.

Tractor Manuals PDF

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 Description

Comments

Std. Ext.

Gauge

A

n/a

Not used

B 022 032 Red 12

Fused Un-

To “B” terminal of gray box. In-Line Fuse in JD harness hanging low.

switched Battery

Power

C

n/a

Not used

D 422 422 Red 12

Starter Relay

To “Start Button”. When start button pushed, 12v must flow through

terminal 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 Wired to the “Ignition” terminal of the Key Switch.

ECU (Switched)

H

n/a

Not used

J 412 412 Red 18

Alternator

Under terminal “G” (Switched Power)

ignition

K

n/a

L

n/a

M

n/a

N

n/a

O

n/a

P

n/a

Not used Not used Not used Not used Not used 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 Speed

Not currently used

Down

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

Tractor Manuals PDF

Tractor Manuals PDF

5

ITEM NO .

PART NUMBER

1

8197313

2

E122

3

E784

4

80575-114

5

38RH

C

6

TY-570

7

80575-101

8

832-34RHMS

9

832SLN

10

80575-104

11

80575-103

2

4

3

DESC RIPTIO N Wire , T-630 JD4045T23 Pin EC U Te rmina l Vi Sp a d e (8-st) 22-16
Lo o m Wire 13/ 32 La d d Stra in Re lie f She ll Size 24
38″ Re d Rub b e r ho se Tie Wra p
Pla stic Plug , 23 Pin Sc re w Rh Ma c h. 8-32x 3/ 4
Nut Se lf-lo c k 8-32 Plug , Se a ling Size 12-16 So c ke t, Sta mp e d & Fo rg e d # 16-18

X- 16 G a Bla c k, Syste m G ro und , 40″ Lo ng , La b e l 3 B
K- 16 G a Bro wn, Exte rna l shud Do wn Inp ut, 37″ Lo ng , La b e l K
Q- 16 G a Re d , Switc he d Po we r, 36″ Lo ng , La b e l Q

Q TY. 1 3 1 1 1 1 1 1 1 20 3

2
23 Pin C o nne c to r

1 C

10 4

7 8

B

3

29 1/ 2″ Lo ng Wire Lo o m

5

6

9

A

O ne Re q uire d Pe r Unit

A

8197313

DR. BY fe w

T-630

DATE 5/ 4/ 2006

MAC HINE & STEEL
SERVIC E INC .

Wire , T-630 JD4045T23 Pin EC U

P.O . BO X 492810 LEESBURG , FLA. 34749-2810

5

4 https://tractormanu3alz.com/

2

SC ALE: HALF
8197313
1

5

4

3

2

ITEM NO .

PART NUMBER

1

8197312

2

E153

3

E122

4

E785

5

80575-114

C

6

TY-570

7

80575-100

8

80575-104

9

832-34RHMS

10

832SLN

11

80575-102

12

80575-103

DESC RIPTIO N Wire , T-630 JD4045T21 Pin EC U Te rmina l Vi Sp a d e 10 Stud 10-12 Te rmina l Vi Sp a d e (8-st) 22-16
Lo o m Wire 3/ 4 La d d Stra in Re lie f She ll Size 24
Tie Wra p Pla stic Plug , 21 Pin Plug , Se a ling Size 12-16 Sc re w Rh Ma c h. 8-32x 3/ 4 Nut Se lf-lo c k 8-32 So c ke t, Sta mp e d & Fo rg e d # 12 So c ke t, Sta mp e d & Fo rg e d # 16-18

Q TY. 1 4 10 1 1 1 1 9 1 1 3 9

1
21 Pin C o nne c to r C

18 G a Re d , to Te rm ina l 2 In Bo x, 3″ Lo ng
B- 12 G a Re d , Fuse d Unswitc he d Ba tte ry Po we r, 40″ Lo ng G – 12 G a Re d , Ba tte ry Po we r to EC U, Switc he d , 40″ Lo ng

B

D- 12 G a Re d , Sta rte r Re la y, 40″ Lo ng

J- 18 G a Re d , Alte rna to r Ig nitio n (Jum p to G ), 40″ lo ng

E- 12 G a Bla c k, G ro und ,39″ Lo ng

V- 18 G a Ye llo w, C a n Hig h, 39″ Lo ng U- 18 G a G re e n, C a n Lo w, 38 1/ 2″ Lo ng

B 9 26″ Lo ng Lo o m 4
10

F-18 G a Bla c k, C a n Shie ld , 37 1/ 2″ Lo ng

R-18 G a Purp le (Vio le t), Thro ttle Switc h, 32″ Lo ng S- 18 G A Ye llo w, Se nso r Re turn, 31 1/ 2″ Lo ng T- 18 G a Blue , Re sume / C o a st/ Bump Sp e e d Do wn, 32 1/ 2″ Lo ng W- 18 G a G re e n, Se t/ Ac c e le ra te / Bump Sp e e d Up , 33 1/ 2″ Lo ng X- 18 G a O ra ng e , Bump Ena b le a nd Bra ke Ena b le , 34″ Lo ng

6

4

5

7

A

3

2

O ne Re q uire d Pe r Unit
8197312
T-630

MAC HINE & STEEL
SERVIC E INC .

Wire , T-630 JD4045T21 Pin EC U

P.O . BO X 492810 LEESBURG , FLA. 34749-2810

5

4 https://tractormanu3alz.com/

2

A DR. BY fe w
DATE 5/ 4/ 2006 SC ALE: HALF 8197312
1

T-630 John Deere Engine with ECU Trouble Shooting

Engine Diagnostic lights, but engine does not even try to start (starter does not
engage at all).

Probably Neutral Start safety on main pump. With key off, confirm
continuity between terminals D & 4 on top strip in Gray Box. Is there
Continuity?

Remove bolt connecting Air Cylinder eye to actuator arm on main pump. Check continuity
again. Is it OK now?

Check encapsulated relay on engine compartment wall, right
side of engine for proper operation. Is it OK?

Move pump lever by hand back and forth
slightly to see if continuity can be
established.

Adjust eye on cylinder rod ½ turn at a time to correct alignment.

Replace Relay
Contact your local Deere Dealer.

Refer to wiring diagram and confirm wiring not broken.
Wiring OK
Refer to Neutral Start adjustment procedure in pump manual. Possible
Switch replacement necessary.

Tractor Manuals PDF

Engine starts and runs for about 30 seconds, but
then quits.

T-630 John Deere Engine with ECU Trouble Shooting

Are fault codes SPN 970 ­ FMI 31 (probably one of the T-630’s external
systems if so)

Disconnect the 23 pin connector from the Gray Box to the John Deere wiring harness. (It is the lower of the two main connectors from the Gray Box). Re- start the
engine.

Contact your local Deere Dealer.

Still shuts down.

There are 3 T-630 Auxiliary functions to instruct the John
Deere ECU to shut down. They need to be tested
independently. Make sure engine is off prior to setting up
for each test.

Unplug water level sensor in top of
radiator. Re-Start.

Remove wire from Hydraulic level Sensor
under Terminal K ­ Lower terminal strip in
Gray Box. Re-Start.

The E-Stop ­ disconnect either wire on the E-Stop Contact. Re-Start.

Solved? Verify Fluid Level or
Replace sensor.

Tractor Manuals PDF

Solved? Replace E-Stop Contact.

References

• Tractor Manuals PDF free download

Read User Manual Online (PDF format)

Download This Manual (PDF format)

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