The New Holland C337 skid steer loader uses a straightforward instrument cluster with color-coded indicator lights to quickly inform the operator of machine status. Critical warnings demand immediate action to prevent damage, while cautionary lights indicate service needs or potential issues.
New Holland C337 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault has occurred on your C337, such as low engine oil pressure or high coolant temperature, requiring immediate engine shutdown. | Stop the engine safely and consult the operator's manual for the specific fault code. | |
| Master Caution | AMBER | The C337's electronic controller has detected a non-critical fault that needs attention soon, such as a sensor error or fluid level issue. | Check the display for accompanying messages and schedule service as needed. | |
| Check Engine (MIL) | AMBER | The engine management system on your C337 has detected a fault in the emissions or fuel system, possibly affecting performance or regulatory compliance. | Have the engine diagnostic codes read by a New Holland dealer. | |
| Engine Oil Pressure | RED | Engine oil pressure in the C337 is dangerously low, risking severe engine damage if operation continues. | Stop the engine immediately and check oil level; do not restart until the issue is resolved. | |
| Battery / Charging | RED | The C337's alternator is not charging the battery or the charging voltage is out of range, which may lead to electrical failure. | Check alternator belt and connections; if light stays on, service the charging system. | |
| Coolant Temperature | RED | Engine coolant temperature in the C337 has exceeded the safe limit, risking overheating and engine damage. | Stop the engine and allow it to cool; check coolant level and for leaks. | |
| Hydraulic System | AMBER | The hydraulic system in the C337 has detected a fault, such as low oil level or high temperature, affecting loader and drive functions. | Check hydraulic oil level and temperature; if persistent, have the system inspected. | |
| Parking Brake | RED | The parking brake on the C337 is engaged or a brake system fault is present, preventing normal operation. | Ensure the parking brake is fully released; if light stays on, have the brake system checked. | |
| Seat Belt | AMBER | The operator's seat belt on the C337 is not fastened; the machine may be in a restricted operation mode until it is secured. | Fasten the seat belt to enable full machine functions. | |
| Glow Plug / Preheat | AMBER | The glow plugs are active or the preheat cycle is in progress on the C337's diesel engine; wait until the light turns off before starting. | Wait for the light to extinguish, then crank the engine. | |
| DPF / Regeneration | AMBER | The diesel particulate filter on the C337 requires active regeneration to clear accumulated soot; the engine may run at higher idle. | Operate the machine at a steady load or initiate parked regeneration per the manual. | |
| Water in Fuel | AMBER | Water has been detected in the C337's fuel filter/water separator, which can damage the injection system. | Drain the water separator and replace the fuel filter if necessary. | |
| Low Fuel | AMBER | The C337's fuel level is low; refuel soon to avoid engine stall and air ingress in the fuel system. | Add diesel fuel; do not run the tank completely dry. | |
| High Beam | BLUE | The high-beam headlights on the C337 are activated for increased visibility in dark or dusty conditions. | No action needed; use as appropriate for the work environment. |
14 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 fins
- Faulty cooling fan
What to do
Inspect coolant level and radiator cleanliness on your C337; clean debris from the radiator and ensure the fan belt is intact.
Loss of Hydraulic Power
Common causes
- Low hydraulic oil level
- Contaminated hydraulic fluid
- Failed hydraulic pump
What to do
Check hydraulic oil reservoir and add the correct New Holland spec oil; if contaminated, replace filters and fluid.
Engine Won't Start
Common causes
- Dead battery
- Faulty glow plug system
- Fuel system air or water
What to do
Verify battery voltage and connections; confirm glow plug light goes off before cranking; bleed fuel system if water is present.
Brake System Failure
Common causes
- Low brake fluid
- Worn brake pads
- Air in brake lines
What to do
Check brake fluid reservoir on the C337; if low, inspect for leaks and top up; have brakes bled if pedal feels spongy.
Frequently Asked Questions
Why is the master warning light on and the C337 shutting down?
This indicates a critical fault like low oil pressure or high coolant temperature. Stop the engine, check fluid levels, and consult the operator's manual for the fault code.
The hydraulic light is amber. Can I continue working?
Yes, but proceed with caution. The hydraulic system may be overheating or low on fluid. Check the level and temperature; if the light turns red, stop immediately.
How do I perform a DPF regeneration on the C337?
The machine may initiate regeneration automatically. If not, you can start a parked regeneration by pressing the regeneration button (if equipped) while the engine is at operating temperature and the machine is stationary.
What does the water-in-fuel light mean?
It means water has accumulated in the fuel filter/water separator. Drain the separator by opening the valve at the bottom of the filter bowl until clear fuel flows.
My C337 won't start and the glow plug light is flashing. What's wrong?
A flashing glow plug light indicates a fault in the preheat system, such as a bad glow plug or relay. Have the system diagnosed by a technician.
How often should I check the air filter indicator on my C337?
Check the air filter restriction indicator daily, especially in dusty conditions. Replace the filter when the indicator shows maximum restriction or at regular service intervals.