The Massey Ferguson MF 240 is a robust utility tractor with a simple instrument cluster designed for reliable field work. Its warning lights cover engine, hydraulics, and PTO systems, helping operators avoid costly downtime. Understanding these indicators is key to safe and efficient operation.
Massey Ferguson MF 240 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning | RED | This red beacon on the MF 240 signals a critical fault such as low oil pressure or overheating that requires immediate attention. | Stop the tractor and diagnose the underlying issue before continuing. | |
| Engine Oil Pressure | RED | Illuminates when oil pressure drops dangerously low, often due to low oil level or a failing pump in the Perkins engine. | Shut off the engine and check oil level and filter; if low, add oil and inspect for leaks. | |
| Battery Charging | RED | Comes on when the alternator fails to charge, leaving the MF 240 running on battery power alone. | Check alternator belt tension and battery connections; replace belt if worn. | |
| Coolant Temperature | RED | Warns of engine overheating, common if the radiator is clogged with chaff or coolant is low. | Let the engine cool, then inspect coolant level and clean radiator fins. | |
| Brake System | RED | Indicates low brake fluid or a leak in the MF 240's hydraulic brake system. | Check brake fluid reservoir and inspect lines for leaks; top up fluid. | |
| Parking Brake | AMBER | This amber light reminds the operator that the parking brake is engaged on the MF 240. | Release the parking brake before moving the tractor. | |
| Glow Plug / Preheat | AMBER | Lights during cold start preheating to warm the combustion chambers on the MF 240's diesel engine. | Wait for the light to turn off before turning the key to start. | |
| Water in Fuel | AMBER | Alerts you to water buildup in the fuel filter/water separator, which can cause injector damage. | Drain the water separator bowl located on the fuel filter housing. | |
| Low Fuel | AMBER | Comes on when the fuel level drops below about 1/8 tank, common during long fieldwork. | Refuel with clean diesel to avoid air in the system. | |
| High Beam | BLUE | Blue indicator shows the headlights are set to high beam for better visibility at night. | Dim the headlights when approaching other vehicles. | |
| Hydraulic System | AMBER | Warns of high hydraulic oil temperature or a clogged filter in the MF 240's hydraulic system. | Reduce load and check hydraulic oil level and filter condition. | |
| Air Filter | AMBER | Illuminates when the engine air intake filter is restricted, often due to dust or debris. | Clean or replace the air filter element. | |
| Fuel Filter / Water Separator | AMBER | Indicates a clogged fuel filter or water in the separator, affecting engine performance. | Replace the fuel filter and drain any water from the separator. | |
| Service / Hour Meter | AMBER | This amber service reminder lights up at preset intervals (e.g., every 100 hours) for maintenance. | Perform scheduled oil change and filter replacements as per the manual. | |
| Work Lights | GREEN | Green indicator that the rear work lights are on, aiding nighttime operations. | Turn off work lights when not needed to save battery. | |
| PTO Engaged | GREEN | This green light shows that the power take-off is engaged and rotating. | Disengage PTO when not in use to prevent accidental shaft rotation. | |
| Differential Lock | AMBER | Amber light when the differential lock is engaged to improve traction in slippery conditions. | Disengage differential lock on hard surfaces to avoid driveline damage. |
17 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 with chaff
- Failed thermostat
What to do
Check coolant level and top up with proper mixture; clean radiator fins with compressed air; replace thermostat if stuck closed.
Low Oil Pressure
Common causes
- Low oil level
- Worn oil pump
- Clogged oil filter
What to do
Check oil level and add the recommended 15W-40; replace oil filter; if light persists, inspect oil pump for wear.
Charging System Failure
Common causes
- Loose alternator belt
- Corroded battery terminals
- Faulty alternator
What to do
Tighten or replace the alternator belt; clean battery terminals; test alternator output; replace if below 13.5V.
Brake System Malfunction
Common causes
- Low brake fluid
- Leaking brake line
- Worn brake pads
What to do
Top up brake fluid reservoir using DOT 3 fluid; inspect lines for leaks; replace pads if worn beyond limit.
Water in Fuel
Common causes
- Condensation in tank
- Contaminated diesel
- Damaged fuel cap seal
What to do
Drain water from the filter/separator; if recurring, add fuel additive and replace cap seal.
Frequently Asked Questions
Why does the red oil pressure light come on intermittently?
Intermittent oil pressure light on the MF 240 often indicates low oil level during slopes or a worn oil pump. Check the dipstick and ensure oil is at full mark; if ok, have the pump inspected.
How do I reset the service hour meter light?
Turn the ignition off, press and hold the hour meter reset button (usually near the tachometer), then turn the key to ON while holding. Release when the light flashes or turns off.
What does a flashing glow plug light mean?
A flashing glow plug light on the MF 240 indicates a fault in the preheat circuit, such as a blown fuse or failed relay. Have the system checked by a dealer to avoid hard starting.
Can I continue working with the amber hydraulic light on?
No, the amber hydraulic light warns of high oil temperature or a blocked filter. Continuing can damage the hydraulic pump. Reduce load or stop to let the system cool, then check the oil level and filter.
Where is the fuel water separator located on the MF 240?
The water separator is integrated into the fuel filter housing on the left side of the engine block. It has a clear bowl with a drain valve at the bottom.
What should I do if the battery light stays on after starting?
If the battery light remains on, the alternator isn't charging. Check the alternator belt tension and battery terminal cleanliness. If those are fine, the alternator may need replacement.