Electric gator will not go: John Deere Gator  -- Utility ATV Discussion Forum and Review Electric gator will not go: John Deere Gator -- Utility ATV Discussion Forum

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 03-10-2016, 17:52 Post: 194703
KAGLJP



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 Electric gator will not go

Chargeed fine. Very snail like forward/reverse. Hear click when pedal pushed. Will go very slooooow!






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 03-10-2016, 19:55 Post: 194704
PaulChristenson



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 Electric gator will not go

FORWARD & THROTTLE CIRCUIT OPERATION
Function:
To cause the vehicle to be propelled in a forward direction under the control of the operator.
Operating Conditions:
To operate the vehicle in forward, the drive/service switch must be in the DRIVE position, the key switch must be ON, the park brake must be OFF, the directional control in the FORWARD (pushed down) position, the throttle pedal PRESSED slowly and smoothly to the desired speed, and the area for the vehicle to be operated must be clear of bystanders.
System Operation:
The input signal power for the forward command is supplied through the S2 drive/service switch and the S3 key switch. See “SECONDARY SWITCHED POWER CIRCUIT OPERATION” on page 30.
When performing a forward command, several switches are activated at the same time. The S4 throttle switch, S5 park brake switch, and the S8 forward switch will all have their contacts closed to supply 48VDC input power to the A1 motor controller. The R1 throttle potentiometer will also be activated to supply an input to the A1 motor controller to signal the motor controller as to how far the throttle pedal has been pressed down (how fast the operator is attempting to travel).
For all of these inputs there are several outputs performed by the A1 motor controller that must happen for the vehicle to operate in forward. The J1-17 terminal must switch to battery negative causing the K1 motor relay to pull in completing the path from the battery positive (B+) terminal to the motor controller (B+) terminal and the M1 drive motor A1 terminal. The F1 terminal of the motor controller must supply output voltage to the motor field windings while the F2 terminal will become the battery negative path for the field winding. The motor controller as a result of the position of the R1 throttle potentiometer, will change the output on the M1 terminal causing the motor to run faster.
If any one or more of these inputs or outputs is not correct, the A1 motor controller will shut down and not allow the vehicle to respond to the forward command.
When performing a forward command 48 volt power is supplied from the S3 key switch to the 382, 372, 362, 322, 332, 342, 312, 302 and 102 Red wires.
With the park brake in the OFF position, the 322 Red wire supplies power to the S5 park brake switch contacts (normally open), 269 Tan wire and the A1 motor controller J1-21 terminal. The A1 motor controller reads the input of full battery voltage on the J1-21 terminal and will power the motor controller to allow output on either the F1 (forward) or F2 (reverse) terminals.
With the directional lever in the forward position, power is supplied from the 332 Red wire to the S8 forward switch contacts (normally open), 222 Pnk wire and the A1 motor controller J1-10 terminal. The A1 motor controller will respond with the F1 terminal having a positive voltage output to the 640 Blk wire, M1 drive motor E1 terminal, through the field windings to the E2 terminal, 659 Wht wire and back to the A1 motor controller F2 terminal which is the battery negative path for the forward function.
When the throttle pedal is pressed the 372 Red wire supplies power to the S4 throttle switch contacts (normally open), 125 Grn wire to the A1 motor controller J1-8 terminal. The A1 motor controller will respond with the J1-17 terminal being switched to battery negative. As a result of this input the A1 motor controller will switch the J1-17 terminal to battery negative. This will then provide a battery negative path for the 264, 404 and 414 Yel/Blk wires, K1 motor relay, and P1 hour meter/battery fuel gauge (optional). This will energize the K1 motor relay closing the relay contacts supplying battery voltage to the 600 Blk wire and the B+ terminal of the motor controller and the A1 terminal of the drive motor. This will also provide the battery negative for the hour meter and begin recording the time that the K1 motor relay is energized.
The R1 throttle potentiometer receives 4.5 volts from the motor controller when the primary switch circuits are activated. The J1-13 terminal of the A1 motor controller supplies approximately 4.5 volts to the 244 Yel wire and the R1 throttle potentiometer. With the R1 throttle potentiometer in the neutral position the resistance of the throttle potentiometer drops the voltage to the 256 Blu and 251 Brn wires to between 0.3 - 0.6 volts. As the throttle pedal is pressed down, the voltage on the 256 Blu wire will raise to 4.0 volts when the pedal is pressed all the way down. If the pedal is only pressed half way down, throttle pot rotated 50%, the voltage on the 256 Blu wire will be approximately 50% or about 2- 2.2 volts. The 251 Brn wire will stay at approximately 0.4 volts. As a result of the throttle pedal being pressed down and changing the voltage on the 256 Blu wire the A1 motor controller will change the voltage of the M- terminal. When the throttle pedal is pressed down to the point that it just activates the S4 throttle switch, the voltage on the M- terminal will be approximately 48 volts. As the pedal is pressed further down, the M- terminal voltage will decrease to approximately 24 volts when the pedal has reached full travel. This then allows the drive motor to run at full rpm, and full speed drive.






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 03-10-2016, 21:31 Post: 194705
kthompson



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 Electric gator will not go

If you press the accelerator pedal with it NOT in gear does the engine speed up to where it sounds like running wide open or not? If it does not maybe a throttle cable issue or clogged fuel filter or carb. If it does then you probably have slipping belt or some other part of the system the allows the belt not to engage while at idle.






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 03-10-2016, 23:04 Post: 194707
PaulChristenson



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 Electric gator will not go

Quote:
Originally Posted by kthompson | view 194705
If you press the accelerator pedal with it NOT in gear does the engine speed up to where it sounds like running wide open or not? If it does not maybe ...


Note...this is an ELECTRIC gator...Smile






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 03-11-2016, 11:02 Post: 194708
Trainpilot



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 Electric gator will not go

The description of the process by which the Gator moves sounds pretty complicated--more so than fuel/air/compression/spark/transmission, but I'm willing to bet that the solution could be simple. I'd verify voltage of the battery bank. Maybe jack up the wheels so you can observe under load. Be very careful of causing any shorts. 48 volts DC is a dangerous voltage. The batteries are connected in series, so they sort of make up one big battery, with a negative lead at one end of the string and a positive lead at the other. Check voltage between these two. It should be more than 48 volts under no load. If it's good there, I'd probably check the throttle potentiometer. The fact that it does move a little makes the safety interlock system less of a suspect. Does the potentiometer move smoothly? Can you watch the output voltage run up to 4V? It sounds like it is only asking the controller for minimum speed. I don't have much experience with electrics, but that's where I'd start. Perhaps someone else will weigh in. Please let us know what resolves this problem.






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 03-13-2016, 21:07 Post: 194714
kthompson



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 Electric gator will not go

Quote:
Originally Posted by PaulChristenson | view 194707
Note...this is an ELECTRIC gator...Smile






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Gator Forum

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