The John Deere Excavator 5100E is a powerful mid-size excavator designed for heavy digging and earthmoving tasks. Its instrument cluster features intuitive warning lights to monitor engine, hydraulic, and electrical systems, ensuring safe and efficient operation.
John Deere Excavator 5100E Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | This red stop light indicates a critical failure, such as low engine oil pressure or high coolant temperature, requiring immediate engine shutdown on the 5100E. | Stop the excavator immediately, shut off the engine, and consult the diagnostic code on the display. | |
| Master Caution | AMBER | Illuminates amber to alert the operator of a non-critical issue, like a clogged air filter or low hydraulic oil level, on the 5100E. | Check the message center for details and address the indicated system soon. | |
| Check Engine (MIL) | AMBER | Lights up amber when the engine control unit detects a fault in the emissions or fuel system of the 5100E's diesel engine. | Have the engine diagnostics scanned by a dealer to identify the specific trouble code. | |
| Engine Oil Pressure | RED | Glows red if oil pressure drops below safe levels, risking severe engine damage on the 5100E. | Shut off the engine immediately and check oil level and leaks. | |
| Battery / Charging | RED | Indicates the charging system is not working properly, often due to a failed alternator or loose belt on the 5100E. | Check alternator drive belt and battery connections; if light persists, replace alternator. | |
| Coolant Temperature | RED | Illuminates red when engine coolant exceeds safe operating temperature, which can occur during heavy digging or if the radiator is clogged on the 5100E. | Allow engine to idle and cool, then clean radiator fins and check coolant level. | |
| Hydraulic Oil | AMBER | Warns amber if hydraulic oil level is low or temperature is high, reducing excavator performance on the 5100E. | Check hydraulic oil reservoir and cooler for blockages; add oil if needed. | |
| Low Fuel | AMBER | Shows amber when the fuel level in the tank drops below 10% on the 5100E. | Refuel as soon as possible to avoid running out during operation. | |
| High Beam | BLUE | Blue indicator confirms the high-beam headlights are enabled for better visibility at night on the 5100E. | Dim to low beam when approaching other vehicles or worksites. | |
| Work Lights | GREEN | Green light shows the auxiliary work lights are on, illuminating the digging area on the 5100E. | Use when operating in low-light conditions; turn off when not needed to save battery. | |
| Beacon / Rotating Light | GREEN | Green indicator confirms the safety beacon is active, warning nearby workers of excavator movement on the 5100E. | Ensure beacon is on whenever the machine is in motion or digging. | |
| Swing / Slew Lock | AMBER | Amber light indicates the swing brake is engaged, preventing upper structure rotation on the 5100E. | Release swing lock before operating the upper swing function. | |
| Service / Hour Meter | AMBER | Amber reminder that scheduled maintenance (e.g., oil change or filter replacement) is due based on operating hours on the 5100E. | Perform required service as per the operator's manual interval. | |
| Air Filter | AMBER | Lights amber when the engine air filter is restricted, causing reduced power and fuel efficiency on the 5100E. | Clean or replace the air filter element as instructed in the manual. | |
| Water in Fuel | AMBER | Indicates water has accumulated in the fuel/water separator, which can damage the injection system on the 5100E. | Drain the water separator immediately and check for fuel contamination. | |
| Fuel Filter / Water Separator | AMBER | Warns that the fuel filter requires replacement due to clogging or contamination on the 5100E. | Replace the fuel filter element and prime the system per manual. | |
| Engine Oil Temperature | AMBER | Glows amber when engine oil temperature is elevated, often during sustained heavy load operation on the 5100E. | Reduce engine load and allow the machine to idle until temperature normalizes. | |
| Low Oil Level | AMBER | Indicates the engine oil level is below the safe operating range on the 5100E. | Check oil level with dipstick and add recommended oil to full mark. | |
| Glow Plug / Preheat | AMBER | Amber glow plug light stays on during preheating in cold starts; turns off when the engine is ready on the 5100E. | Wait for the light to extinguish before cranking the engine in cold weather. |
19 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Low coolant level
- Clogged radiator or hydraulic oil cooler
- Faulty cooling fan or thermostat
What to do
Stop the excavator and let the engine idle to cool. Check coolant level and inspect the radiator and cooler for debris; clean as needed. If the problem persists, have the thermostat and fan drive tested by a John Deere dealer.
Hydraulic System Failure
Common causes
- Low hydraulic oil level
- Contaminated hydraulic oil
- Broken hydraulic pump or line
What to do
Immediately stop all hydraulic functions. Check the hydraulic oil reservoir level and add recommended oil. Look for leaks in hoses and fittings. If the light stays on, do not operate; contact a service technician.
Engine Oil Pressure Loss
Common causes
- Low engine oil level
- Faulty oil pressure sender
- Worn oil pump or blocked filter
What to do
Shut off the engine immediately. Check oil level with the dipstick; add oil if low. If level is fine, do not restart—have the oil pressure system diagnosed by a professional to avoid catastrophic engine failure.
Charging System Malfunction
Common causes
- Loose or broken alternator belt
- Failed alternator
- Corroded battery connections
What to do
Check the alternator belt tension and condition. Inspect battery terminals for corrosion and tighten connections. If the light remains on, replace the alternator or have the charging circuit tested.
Fuel System Contamination
Common causes
- Water in fuel from condensation or bad fuel
- Clogged fuel filter
- Air in the fuel lines
What to do
Drain the fuel/water separator. Replace the fuel filter and prime the system. Use clean, high-quality diesel. If the problem recurs, have the fuel tank inspected for water ingress.
Frequently Asked Questions
Why does the master warning light come on and the engine shut down while digging?
This usually indicates a critical condition like low oil pressure or high coolant temperature. On the 5100E, the engine control system automatically shuts down to prevent damage. Check the message center for the specific fault and address it before restarting.
What should I do if the hydraulic oil light flickers intermittently?
Intermittent flickering on the 5100E may indicate a low hydraulic oil level during tilting or a partial blockage in the cooler. Check the reservoir level on level ground and inspect the hydraulic oil cooler for debris. If it persists, have the system inspected for leaks.
How do I reset the hour meter service light after maintenance?
After performing the scheduled service, turn the key to ON without starting the engine, then press and hold the 'Service Reset' button (located on the instrument panel) for 5 seconds until the light turns off. Refer to the operator's manual for exact procedure.
Can I operate the excavator with the air filter light on?
You can operate temporarily, but prolonged running with a restricted air filter reduces power and increases fuel consumption on the 5100E. Clean or replace the air filter as soon as possible to avoid engine damage.
What does the swing lock light mean and how do I disengage it?
The amber swing lock light indicates the upper structure swivel brake is engaged. To disengage, press the swing lock switch (usually located on the right console) to release the brake. The light will turn off when the swing is unlocked.
Why does the glow plug light stay on for a long time in cold weather?
The 5100E's glow plug system preheats the combustion chambers to aid cold starts. In very cold conditions, the light may stay on for up to 30 seconds. Do not crank the engine until the light goes out to ensure reliable starting.