The John Deere 5085E tractor features a comprehensive instrument cluster with indicator lights for engine, hydraulic, and electrical systems. Understanding these warnings helps maintain safe and efficient operation in the field.
John Deere 5085E Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | Illuminates red when a critical fault is detected in the 5085E's powertrain, hydraulics, or electrical system, demanding immediate shutdown. | Park tractor safely, turn off engine, and consult the diagnostic code display. | |
| Master Caution | AMBER | Amber light indicates a non-critical fault that should be reviewed soon, such as a minor sensor or fluid issue on the 5085E. | Check the information display for specific warnings; schedule service if light persists. | |
| Check Engine (MIL) | AMBER | Ambers when the ECM detects an engine performance issue, like a faulty sensor or emission component in the 5085E's Tier 3 engine. | Reduce load and have dealer run diagnostics using the Service Advisor system. | |
| Engine Oil Pressure | RED | Red warning when engine oil pressure drops below safe level, risking bearing damage in the 5085E's 3-cylinder diesel. | Stop engine immediately; check oil level and pressure sender. | |
| Battery / Charging | RED | Lights red if alternator output is insufficient or battery voltage is low, common on 5085E machines with high electrical load from lights or PTO. | Check alternator belt tension and battery connections; recharge or replace battery if needed. | |
| Coolant Temperature | RED | Red when engine coolant exceeds safe limit, often due to radiator blockage or coolant loss in the 5085E's cooling system. | Stop engine, let cool, then clean radiator fins and check coolant level. | |
| Glow Plug / Preheat | AMBER | Amber glow plug indicator stays on during cold start preheat cycle for the 5085E's indirect injection engine. | Wait for light to turn off before cranking; if it flashes, check glow plug relay. | |
| Parking Brake | RED | Red indicator when parking brake is engaged; on 5085E also warns if brake is partially applied while driving. | Fully release parking brake before moving; if light stays on, inspect brake linkage. | |
| Seat Belt | RED | Red light with chime if operator is seated but belt unfastened on a 5085E with seat switch option. | Fasten seat belt; if light persists with belt on, check seat switch wiring. | |
| Low Fuel | AMBER | Amber icon when fuel level is low, typically activates with about 5 gallons remaining in the 5085E's 26-gallon tank. | Refuel with diesel ASAP to avoid air in system. | |
| High Beam | BLUE | Blue high beam indicator shows when headlamp high beams are activated on the 5085E for improved field visibility. | Ensure high beams are used only in open areas to avoid blinding oncoming traffic. | |
| PTO Engaged | GREEN | Green light confirms that the rear PTO shaft is engaged; on 5085E, PTO engagement is via a dash switch. | Disengage PTO before stopping engine or working near shaft. | |
| Hydraulic System | AMBER | Amber warning when hydraulic oil temperature or pressure is out of range, affecting loader/backhoe function on 5085E. | Check hydraulic oil level and cooler screens; reduce heavy use until light goes out. |
13 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheat
Common causes
- Low coolant level or leak
- Clogged radiator cores with debris
- Faulty coolant temperature sensor
What to do
On the 5085E, immediately shut down the engine and let it cool. Check coolant recovery tank; add Deere Cool-Gard if low. Clean radiator fins with compressed air.
Low Engine Oil Pressure
Common causes
- Insufficient oil level
- Diluted oil due to fuel leak
- Worn oil pump or blocked pickup screen
What to do
Stop engine at once. Verify oil level on dipstick (should be between marks). If oil is milky or has fuel smell, change oil and filter; consult dealer for pump issue.
Hydraulic System Failure
Common causes
- Low hydraulic oil level
- Contaminated oil from failed seal
- Relief valve stuck open
What to do
Check hydraulic oil sight glass on the right side of 5085E; refill with Deere Hy-Gard. If oil foams, drain and replace; inspect for external leaks.
Electrical Charging Fault
Common causes
- Loose or corroded battery cables
- Failed alternator or voltage regulator
- Loaded electrical system exceeding alternator capacity
What to do
Clean battery terminals and tighten connections. Use voltmeter to check alternator output (should be ~14V at idle). Reduce accessory load if light persists.
Transmission Overheating
Common causes
- Low transmission fluid level
- Clogged transmission cooler
- Continuous heavy PTO use in high ambient temp
What to do
Shift to neutral, run engine at low idle to circulate fluid. Check transmission dipstick under left side of tractor; add Deere Hy-Gard. Clean cooler fins.
Frequently Asked Questions
Why does the master warning light come on occasionally during heavy tillage on my 5085E?
That typically indicates a temporary hydraulic or transmission overheat condition. Reduce ground speed or PTO load; if it stays on, check fluid levels and radiator screen.
How do I reset the amber check engine light after fixing a fault on my 5085E?
The light may auto-reset after three consecutive clean operation cycles (engine warm up, run at load, cool down). If not, a dealer can clear it with Service Advisor.
The glow plug light flashes slowly when I turn the key on my 5085E. What does that mean?
Flashing indicates a fault in the glow plug system—usually a failed glow plug or relay. The engine may still start but expect rough operation in cold weather; replace faulty plugs.
What should I do if both the oil pressure and battery lights come on at the same time on my 5085E?
This often points to a bad engine ground or alternator failure causing low system voltage. Check battery cable connections first; if good, have alternator tested.
Is the PTO light supposed to stay on even after I disengage the switch on my 5085E?
No, if it stays on, the PTO clutch may be stuck or the switch is faulty. Disengage the PTO, then check for binding at the shaft; if light persists, see your dealer.
How do I test the hydraulic light circuit on a 5085E before buying?
With engine running, operate loader and see if the light stays off. Quick movement without load increases temp; if light comes on falsely, temperature sensor could be defective.