T-630 With John Deere Electronic Engines
T-630 with John Deere Electronic EnginesTroubleshootingThe T-630 is equipped with a digital readout located in the “Gray Box” on the right side of the enginecompartment. This diagnostic gauge gives hours, temperature, RPM, and a number of other items of regularinformation. In the event of a shut down or failure to start, service codes will be displayed. Before turning thekey off, read the displays service codes which can be looked up in the John Deere manual received in the T-630owner’s manual.The “Gray Box” serves as the junction box between John Deere and the shut down devices external to the JohnDeere 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 theright side of the engine down in the engine compartment. Within the Gray Box, terminal B should have 12vpower 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 EngineShutdown Switch Active. Three functions on the T-630 will give this code:1)2)3)The E-StopLow water (radiator) level sensorLow Hydraulic level sensorAll other codes are originated from John Deere and your nearest John Dealer is the best resource for troubleshooting.In the event of an ECU shut down, re-set the ECU by turning the key off for 20 seconds after recordingfault codes or the engine will not re-start.Frequently asked questions:Symptom:Diagnostic Gauge lights donot come on when switch isturned onNo power on terminal B ofGray BoxEngine Diagnostic lights,but engine does not even tryto start (starter does notengage at all)Engine starts and runs forabout 30 seconds, but thenquits.Engine tries to shut downwhen turning leftEngine tries to shut downgoing straight over bumpysurfaceEngine start and runs for 30seconds with E-Stop in.Check:Check in-line fuses in John Deere Wiring Harness. (right side of engine, low incompartment)Check in-line fuses in John Deere Wiring Harness. (right side of engine, low incompartment)Refer to flow chartRefer to flow chartWater low in radiator or overflow bottle is empty. Must be water in overflowbottle.Probably low Hydraulic level.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)PinCircuit reGaugeDescriptionCommentsNot usedNot usedNot usedNot usedNot usedNot usedNot usedNot usedNot usedBrown16ExternalshutdowninputInput from T-630 Auxiliary functions to the John Deere ECU to shut down. 3functions on the T-630 complete this circuit.Low Water Level – is water in the overflow bottle? This can be unplugged totest.Low Hydraulic Level – disconnect K or Q of the oil sensor leads on the bottomterminal 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 fortesting by disconnecting the 23 pin connector. (it is the lower of the n/an/an/an/aX050Not usedNot usedNot usedNot usedNot usedRed16SwitchedPower (12v)Only active when switch is on. Power connection for the External Shutdown (PinK) circuits.Not usedNot usedNot usedNot usedNot usedNot usedBlack16SystemGroundGeneral 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)PinCircuit ugeDescriptionCommentsNot used032Red12Fused Unswitched BatteryPower422Red12Starter Relay050020012BlackBlackRed181812GroundCAN ShieldBattery place RelayRefer to wiring diagram andconfirm wiring not broken.Wiring OKContact your local Deere Dealer.Refer to Neutral Start adjustmentprocedure in pump manual. PossibleSwitch replacement necessary.
T-630 John Deere Engine with ECU Trouble ShootingEngine starts and runsfor about 30 seconds, butthen quits.Disconnect the 23 pin connectorfrom the Gray Box to the JohnDeere wiring harness. (It is thelower of the two main connectorsfrom the Gray Box). Re-start theengine.Are fault codes SPN 970– FMI 31 (probably oneof the T-630’s externalsystems if so)There are 3 T-630 Auxiliaryfunctions to instruct the JohnDeere ECU to shut down.They need to be testedindependently. Make sureengine is off prior to setting upfor each test.Still shutsdown.Contact your local Deere Dealer.Unplug water levelsensor in top ofradiator. Re-Start.Solved?Verify Fluid Level orReplace sensor.Remove wire fromHydraulic level Sensorunder Terminal K –Lower terminal strip inGray Box. Re-Start.The E-Stop –disconnect eitherwire on the E-StopContact. Re-Start.Solved?Replace E-Stop Contact.
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 .
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