Claas tractors integrate advanced CEMOS technology for optimized performance. The instrument cluster provides clear, color-coded warnings for critical systems. Understanding these indicators ensures safe and efficient operation.
Claas tractor Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault detected; the engine must be stopped to prevent severe damage. | Immediately stop the tractor in a safe location and consult the operator's manual. | |
| Check Engine (MIL) | AMBER | The engine management system has identified a fault affecting performance or emissions. | Contact a Claas dealer for diagnostic service. | |
| Engine Oil Pressure | RED | Engine oil pressure is critically low; continued operation can cause engine failure. | Stop the engine immediately and check oil level and system for leaks. | |
| Battery / Charging | RED | The charging system is not maintaining battery voltage; electrical loads may fail. | Check alternator belt and connections; have the system tested by a technician. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded safe operating limits. | Stop the engine, allow it to cool, and inspect coolant level and radiator. | |
| Transmission Temp | AMBER | The CVT transmission oil temperature is high; reduce load and allow cooling. | Shift to a lower gear and operate at reduced RPM; if persistent, service required. | |
| Brake System | RED | A fault in the brake system has been detected; braking performance may be compromised. | Stop the tractor safely and have the brake system inspected immediately. | |
| Parking Brake | AMBER | The parking brake is engaged or not fully released. | Disengage the parking brake before moving; if light persists, check brake switch. | |
| Glow Plug / Preheat | AMBER | Glow plugs are active during cold start preheat; wait for the indicator to turn off. | Turn the key to preheat position and wait until the light extinguishes before cranking. | |
| DPF / Regeneration | AMBER | The diesel particulate filter requires active regeneration to clear soot buildup. | Drive at highway speed or initiate parked regeneration via the CEMOS system. | |
| DEF / AdBlue | AMBER | AdBlue level is low or the SCR system has a fault; emissions control may be limited. | Top up AdBlue; if light persists, have the system checked by a Claas dealer. | |
| Water in Fuel | AMBER | Water has been detected in the fuel filter/water separator; drain immediately. | Drain water from the filter bowl; if light returns, replace filter and check fuel source. | |
| Low Fuel | AMBER | Fuel level is low; refuel soon to avoid engine stalling. | Add diesel fuel at the earliest opportunity. | |
| High Beam | BLUE | High beam headlights are currently activated. | Dim high beams when approaching oncoming traffic. | |
| Power Steering (EPS) | RED | Electronic power steering has failed; steering effort will increase significantly. | Stop the tractor; do not operate until the system is repaired. | |
| Hydraulic System | RED | Hydraulic system pressure or oil temperature is out of safe range. | Stop all hydraulic functions and check oil level and filters; service as needed. | |
| PTO Engaged | GREEN | The power take-off is engaged and rotating. | Disengage PTO before servicing or standing near the shaft. | |
| Differential Lock | GREEN | The differential lock is engaged for increased traction. | Disengage differential lock when turning on hard surfaces to avoid driveline damage. | |
| Service / Hour Meter | AMBER | Scheduled maintenance interval has been reached; service is due. | Perform the required service per Claas maintenance schedule; reset indicator via CEMOS. | |
| Work Lights | GREEN | Rear or front work lights are switched on for field operations. | Turn off work lights when driving on public roads to avoid blinding others. | |
| Beacon / Rotating Light | GREEN | The warning beacon is active, indicating the tractor is in motion or operating. | Ensure beacon is used when required by local regulations for visibility. |
21 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
DPF Regeneration Issues
Common causes
- Frequent short trips
- Low exhaust temperature
- Faulty DPF sensor
What to do
Perform active regeneration by driving at highway speeds or using the CEMOS parked regen function. If the light persists, a Claas dealer may need to force regenerate or clean the filter.
AdBlue System Failure
Common causes
- Low AdBlue level
- Faulty pump or injector
- Contaminated fluid
What to do
Refill with certified AdBlue; if the warning remains, have the SCR system diagnosed by a Claas technician – continued operation may result in reduced power.
Transmission Overheating
Common causes
- Excessive load
- Low oil level
- Clogged cooler
What to do
Reduce load and allow the transmission to cool; check oil level and cooler cleanliness. For persistent high temps, a Claas dealer should inspect the CVT system.
Hydraulic System Leak
Common causes
- Damaged hoses
- Loose fittings
- Seal failure
What to do
Immediately stop all hydraulic functions and inspect lines for visible leaks. Tighten connections or replace damaged components; top up hydraulic oil with Claas-approved fluid.
Electrical System Fault
Common causes
- Weak battery
- Corroded terminals
- Faulty alternator
What to do
Check battery voltage and clean terminals; if the red battery light stays on, test the alternator output. A Claas dealer can perform a full electrical diagnostic.
Frequently Asked Questions
What does the red stop light mean on my Claas tractor?
The red stop light indicates a critical fault that requires immediate engine shutdown to prevent damage. Check the operator's manual for the specific fault code and contact a Claas dealer.
How do I reset the service indicator on a Claas tractor?
Use the CEMOS touchscreen or the instrument cluster menu: navigate to 'Settings > Service > Reset Service Interval'. Confirm the reset after performing the required maintenance.
Why is the DPF light flashing and what should I do?
A flashing DPF light means regeneration is needed quickly. Drive the tractor at a steady speed above 20 km/h for 20 minutes, or use the parked regeneration function in CEMOS. If it doesn't clear, visit a dealer.
Can I operate the tractor with the AdBlue warning light on?
You can continue for a limited time, but the engine power will gradually be reduced. Top up AdBlue as soon as possible; if the light stays on, have the system inspected to avoid non-compliance.
What does the amber transmission temp light indicate?
It warns that the CVT transmission oil is overheating. Reduce engine load and shift to a lower gear to allow cooling. If the light turns red, stop the tractor immediately.
How often should I replace the fuel filter on a Claas tractor?
Claas recommends replacing the fuel filter every 500 hours or annually, whichever comes first. If the water-in-fuel light appears, drain and replace the filter sooner.