If | Check |
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Engine Will Not Start Or Is Hard To Start | • Park brake unlocked or not adjusted correctly. • Key switch not in proper position. • Stale or improper fuel / fuel level • Plugged fuel filter. • Plugged air intake filter. • Spark plug wire is loose or disconnected. • Spark plug not gapped correctly. • Blown fuse. • Electrical problem - dead battery. • Choke adjusted incorrectly. See your John Deere dealer. |
Engine Will Not Slow Idle | • Carburetion problems. See your John Deere dealer. • Bent or kinked throttle cable. • Bent governor control. • Incorrect governor idle control. |
Engine Runs Rough or Stalls | • Plugged fuel filter. • Plugged air intake system. • Fuel cap vent dirty. • Stale or improper fuel / fuel level. • Spark plug not gapped correctly. • Replace spark plug. • Choke adjusted incorrectly. See your John Deere Dealer. |
Engine Knocks | • Engine oil level low. • Reduce load. (Slower ground speed.) • Fuel is bad. Fill tank with fresh fuel, correct octane. • Idle speed too slow. |
Engine Overheats | • Clean cooling fins. • Low oil level. • Do not operate at slow idle. Operate at fast idle. • Cooling air intake screen is dirty. • Plugged air intake filter. • Operating at too fast ground speed for conditions. |
Engine Lacks Power | • Plugged air intake system. • Plugged fuel filter. • Improper type of fuel. Drain tank and fill with correct fuel. • Clean cooling fins to help prevent overheating. • Replace spark plug. |
Screen shot from mac. Engine Uses Too Much Oil | • Find and correct oil leaks. • Incorrect engine oil. Gopanel 1 5 0 – manage web servers. • Plugged oil filter. • Plugged air intake filter. |
Engine Backfires Through Muffler | • Throttle should be set at 1/2 throttle before turning off machine. |
High Fuel Consumption | • Improper type of fuel. • Plugged air intake system. • Operating at too fast ground speed for conditions. • Improper valve clearance. See your John Deere Dealer. • Restricted air intake system. |
If | Check |
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Starter Will Not Work | • Blown fuse. • Loose or corroded battery or ground connections. • Loose harness or ground connections to starter. • Park brake switch faulty or not adjusted properly. (See your John Deere Dealer) • Key switch or starter faulty. (See your John Deere Dealer) • Park brake pedal not in proper position. • Low battery power - charge battery. |
Battery Will Not Charge | • Loose or corroded battery or ground connections. • Dead cell in battery. |
PTO Switch Does Not Work | • Blown fuse • Bad switch. • Bad clutch. • Failed regulator/rectifier. • Loose PTO clutch or switch connections. • Loose harness or ground connections. |
Starter Turns Slowly | • Loose or corroded battery or ground connections. • Low battery power - charge battery. • Engine oil viscosity too heavy. • Transmission linkage adjustment problem or failure. |
Real-Time Diagnostic Trouble Code Description | Diagnostic Code | Notes | Action Required to Remove Code: |
---|---|---|---|
Brake Not Locked | 1 - 2 | This code can occur under the following conditions: 1. When the engine is trying to be started without the brake pedal locked. NOTE: Machine will automatically shut down if the following occurs. 2. When the engine is running and operator gets out of seat without the brake locked. | • Verify the Park brake pedal is locked. |
PTO/Mow Engaged | 1 - 3 | • This code will occur only when getting out of the seat while operating the machine with the PTO engaged. | NOTE: For Safety, the PTO can not be engaged with the park brake locked or with the operator out of the seat. • Turn key switch to the OFF position. |
Crank Time Exceeded (20 second limit) | 2 - 4 | This code will let the operator know the maximum cranking time of 20 seconds per crank has been exceeded. | • Return the key to the OFF or RUN position. |
Starter Thermal Protect Mode, 60-second Cool-Down Needed | 2 - 5 | This code indicates that the module has started a 60-second cool-down period to prevent the starter from overheating. | • Turn the key switch to the OFF position and let the starter cool down for at least 60 seconds before making another attempt to start the engine. |
Engine Over Temp, (PTO disabled). • 840A machines | 2 - 6 | This code indicates that the engine has exceeded the maximum operating temperature range. The engine will shut down and the PTO will be disabled. | • Turn key switch to OFF position and let the engine cool down before making another attempt to start the engine. • To ensure that the engine does not continue to overheat, determine the cause. Refer to Troubleshooting - Engine section. |
NOTE: For All “Fault” codes it is important to first check battery, starter, and ground connections. | |||
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Electrical System Diagnostic Trouble Code Description | Diagnostic Code | Notes | Action Required to Remove Code: |
Over Voltage | 3 - 1 | This code indicates that the electronic control module has detected a voltage higher than normal in the electrical charging system. | • Inspect the electrical harness for loose connections, specifically the battery positive and negative, starter, and frame ground (on engine block). |
Low Voltage | 3 - 2 | This code will let the operator know that the battery is being depleted. | • Check charging system connections. |
Weak Battery OR Starter System Issue | 3 - 3 | This code indicates that the battery may have become too weak to turn the starter or that the electronic control module has detected an excessive current draw. | • Recharge the battery. • Check starter system connections and harness wiring. |
Starter Output Short to Battery | 3 - 4 | This code indicates that there is a short in the starter circuit to the battery. | • Inspect electrical harness for pinched, chafed, or frayed wires. |
PTO Output Over-Current | 3 - 5 | This code indicates that there is excessive current through the PTO circuit. | • Inspect electrical harness for pinched, chafed, or frayed wires. |
PTO Output Shorted to Battery | 3 - 6 | This code indicates that there is an electrical short in the PTO circuit to the battery | • Inspect harness for pinched or chafed wires. |
Output Fault Detected | 3 - 7 | This code indicates that the electronic control module has detected an electrical problem in the engine wiring harness and the control module’s internal re-settable fuse has tripped to protect the system. | • Inspect engine harness for pinched or chafed wires. |
Diagnostic Test Mode Code | Fault/Input Code Description | Action Needed to Remove Unwanted Codes: |
---|---|---|
3 - 7 | Control Module’s INTERNAL Resettable Fuse Tripped | • Inspect battery, starter, and ground connections. • Inspect engine harness for pinched or chafed wires. |
3 - 1 | Battery Voltage High | • Inspect electrical harness for loose connections, specifically the battery positive and negative, the starter, and frame ground (on engine block). |
3 - 2 | Battery Voltage Low | • Check battery, starter, and ground connections. • Check charging system connections. |
1 - 2 | Key switch to START | Verify key switch is in RUN mode not START. |
1 - 3 | PTO (Knob) Switch Input ON | Turn OFF switch (knob in the down position). |
1 - 4 | Brake Switch Input ON | Unlock the brake pedal, check brake switch for engagement. |
1 - 5 | Seat Switch Input ON | De-activate seat switch (operator not in seat). |
1 - 8 | Deck Lift Switch Input ON | Release the left lever arm button (black) switch. |
1 - 9 | PTO Stop Switch ON | Release the right lever arm button (yellow) switch. |
Actions Required to Verify Electrical Functionality Note: INPUT actions can be performed in any order. | INPUT Description | Diagnostic Test Mode Code |
---|---|---|
Turn the KEYSWITCH to the START position. The 1-2 Code should flash. Return to RUN position. | Key switch to START | 1 - 2 |
Pull the knob to activate the PTO switch. The 1-3 code should flash. Return PTO to OFF position. | PTO (Knob) Switch Input ON | 1 - 3 |
Activate the BRAKE pedal. The 1-4 code should flash. De-activate the pedal. | Brake Switch Input ON | 1 - 4 |
Sit on seat to activate the SEAT switch. The 1-5 code will should flash. Get out of the seat. | Seat Switch Input ON | 1 - 5 |
Push the black button on the left lever arm to activate the DECK LIFT switch. The 1-8 Code should flash. Release the button. | Deck Lift Switch Input ON | 1 - 8 |
Push the yellow button on the right lever arm to activate the PTO STOP switch | PTO Stop Switch ON | 1 - 9 |
If | Check |
---|---|
Excessive Machine Vibration | • Engine speed too slow. |
Machine Will Not Move With Engine Running | • Park brake locked. • Transmission hydraulic oil level low. • Transmission oil cold - allow engine to warm. • Drive belt slipping or broken. • Bypass pump release valves open. • Traction drive belt damaged or worn. • Transmission problems. See your John Deere Dealer. |
Machine Creeps With Engine Running and Motion Control Levers in a Neutral Position | • Check and adjust neutral creep. |
If | Check |
---|---|
Machine levers are adequately locked in neutral when the park brake is engaged, but the machine creeps. | Check and adjust neutral creep. See Park Brake Adjustment. Check and secure cables and hardware. |
Machine levers have excessive fore-aft movement with the park brake engaged. | Check and align motion control levers. Check control levers for loose hardware or excessive wear. |
Machine levers are adequately locked in neutral, and no creep exists, but the brake pedal will not fully release due to binding in the system. | Back out neutral interlock adjustment set screws 1 flat and re-check system for binding. Add grease to neutral interlock cam. Check and align motion control levers. |
Control levers rub/contact slots in the frame when moved to “out” position. | Check and align motion control levers. |
Brake pedal difficult to engage. | Check and align motion control levers. Add grease to neutral interlock cam. |
Brake switch not engaging/disengaging | Check and align motion control levers. |
If | Check |
---|---|
Steering Not Working | • Bypass pump release valves partially open. • Improper tire Inflation. • Hydrostatic transmission oil low. |
If | Check |
---|---|
Discharge Chute Plugged | • Grass is wet - ground speed may need to be adjusted. • Raise cutting height. • Run engine at fast idle. • Ground speed too fast for conditions. • Correct installation of deck drive belt. |
Mower Deck Vibrates | • Run engine at fast throttle. • Loose hardware. • Check/replace deck drive belt. • Blade bolts are loose. • Blades are bent or worn. • Sharpen and balance blades. • Remove belt shields and clean debris from sheaves. • Check sheaves for proper alignment or damage. See a John Deere dealer. |
Mower Blades Do Not Engage | • Deck drive belt slipping or broken, check and adjust belt tension. • Deck belt tension spring not installed or broken. • PTO switch failure. • Fuse is blown. • Loose electrical connections. |
Mower Mows Unevenly | • Mower deck not properly leveled. • Ground speed too fast for conditions. • Run engine at fast throttle. • Reduce ground speed when making turns. • Sharpen or replace blades. • Change mowing pattern. • Check air pressure in all traction unit tires. |
Poor Quality Cut | • Clean debris build-up from underside of deck. • Check blades for sharpness and damage. • Check discharge chute for damage. • Change blades. • Run engine at fast throttle. |