The John Deere 3320 compact utility tractor's instrument cluster provides essential warnings for safe operation. Understanding these indicators helps prevent damage and ensures longevity, especially during heavy PTO or loader work.
John Deere 3320 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | This red stop light signals a critical fault that requires stopping the engine immediately to prevent severe damage to the 3320's drivetrain or engine. | Stop the tractor and check the LCD display for the specific fault code. | |
| Master Caution | AMBER | The amber caution light alerts you to a non-critical issue that needs attention soon, such as a service reminder or low fluid level. | Check the instrument panel messages and address the indicated system. | |
| Check Engine (MIL) | AMBER | This light indicates an engine management or emission system fault, often related to the 3320's Yanmar diesel engine sensors. | Have the engine diagnosed by a John Deere dealer using diagnostic software. | |
| Engine Oil Pressure | RED | Low engine oil pressure light illuminates when pressure drops below safe levels, risking bearing damage in the 3320's engine. | Stop immediately and check engine oil level and pressure sender. | |
| Battery / Charging | RED | The battery light indicates the alternator is not charging or the battery voltage is low on your 3320. | Check alternator belt tension and battery connections. | |
| Coolant Temperature | RED | Engine coolant temperature is too high; risk of overheating the 3320's engine during heavy mowing or tillage. | Stop engine and allow to cool; clean radiator fins if needed. | |
| Transmission Temp | AMBER | Hydrostatic or eHydro transmission oil temperature is elevated; reduce load to avoid overheating the 3320's drive system. | Reduce ground speed or shift to a higher range to let transmission cool. | |
| Parking Brake | AMBER | Parking brake is engaged on your 3320; it will not move until released. | Release the parking brake before operating. | |
| Glow Plug / Preheat | AMBER | Glow plugs are active for cold starting the 3320's diesel engine; wait until the light goes out to start. | Turn key to the preheat position and wait for the indicator to extinguish. | |
| Low Fuel | AMBER | Fuel level is low in the 3320's tank; refuel soon to avoid air in the fuel system. | Add diesel fuel. | |
| High Beam | BLUE | High beam headlights are on for improved visibility during night operation of the 3320. | Dim when approaching other vehicles. | |
| PTO Engaged | GREEN | Rear PTO is engaged on your 3320, powering implements like mowers or tillers. | Disengage PTO when not in use to prevent accidental starts. | |
| Differential Lock | AMBER | Differential lock is engaged to maximize traction on the 3320 in slippery conditions. | Disengage diff lock when turning on hard surfaces to avoid driveline bind. | |
| Water in Fuel | AMBER | Water detected in the fuel/water separator; drain immediately to protect the 3320's injection system. | Drain water from the separator bowl located on the frame. |
14 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Clogged radiator screen
- Low coolant level
- Failed thermostat
What to do
Stop the 3320 immediately, allow engine to cool, then clean the radiator screen and check coolant level in the overflow bottle.
Low Engine Oil Pressure
Common causes
- Low oil level
- Oil filter clogged
- Oil pump failure
What to do
Shut off engine, check oil level with dipstick, and add John Deere Plus-50 oil if low. If light persists, consult dealer.
Transmission Overheating
Common causes
- Continuous heavy load
- Low transmission fluid
- Clogged cooler fins
What to do
Reduce load and shift to a lower range. If light stays on, check transmission fluid level and clean the external cooler fins on the 3320.
Charging System Failure
Common causes
- Loose alternator belt
- Failed alternator
- Corroded battery terminals
What to do
Check alternator belt tension (should deflect 1/2 inch) and clean battery terminals. Replace alternator if necessary.
Fuel System Contamination
Common causes
- Water in fuel
- Clogged fuel filter
- Bad fuel
What to do
Drain water from the fuel filter/water separator (located on left side of engine) and replace the fuel filter if the light remains on.
Frequently Asked Questions
Why does my John Deere 3320's check engine light come on after refueling?
If the fuel cap is not tightened fully, the evaporative system may detect a leak. Also, using low-quality diesel can trigger the light. Tighten the cap and cycle the key; if it persists, have the fuel quality checked.
What does the flashing amber light on the dash mean?
A flashing amber caution light on the 3320 typically indicates a transmission temperature warning or a hydraulic system pressure issue. Check the LCD for specific fault codes and reduce load accordingly.
How long should I wait after the glow plug light goes out before starting?
On the 3320, start the engine immediately after the glow plug light extinguishes. Waiting too long may cause hard starting in cold weather.
Can I continue working if the transmission temp light is on but not flashing?
No, if the transmission temp light is steady amber, reduce load immediately. If it stays on, stop and let the transmission cool. Continuing may cause damage to the eHydro transmission.
What is the service hour meter light on my 3320?
The wrench icon illuminates at 50-hour intervals to remind you of scheduled maintenance, such as engine oil and filter changes. Reset it after service by following the procedure in the owner's manual.
Why does my parking brake light not go off even when released?
This could indicate a faulty parking brake switch on the 3320. Check the lever position; if the light remains, the switch may need adjustment or replacement at a dealer.