The ASV RT-40 compact track loader uses a 2.3L Kubota diesel engine and hydraulic drive. Its warning indicators help you monitor machine health and avoid downtime. This guide explains each light's specific meaning for the RT-40 and the immediate steps to take.
ASV RT-40 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Check Engine (MIL) | AMBER | The engine control module detected a fault in the RT-40's emissions or fuel system, often related to the DPF or sensors. | Operate at reduced load and check for engine codes using a diagnostic tool; if flashing, stop immediately. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe level, risking severe engine damage on the RT-40. | Stop engine immediately, check oil level, and inspect for leaks or blocked filter. | |
| Battery / Charging | RED | The alternator is not charging the battery, or voltage is too low for the RT-40's electrical system. | Check alternator belt tension and battery connections; have charging system tested. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded the safe limit, risking overheating in the RT-40's compact engine bay. | Stop engine, let it cool, check coolant level and radiator for debris. | |
| Hydraulic System | AMBER | Hydraulic oil temperature is high or fluid level is low, reducing performance of the RT-40's lift and drive. | Reduce load and let hydraulics cool; check fluid level and condition. | |
| Parking Brake | RED | Parking brake is engaged or a circuit fault is present; the RT-40 will not move unless disengaged. | Release parking brake fully; if light stays on, inspect brake switch and wiring. | |
| Seat Belt | RED | Operator seat belt is not fastened; the RT-40 may disable lift/tilt functions as a safety precaution. | Fasten the seat belt to resume full machine operation. | |
| Glow Plug / Preheat | AMBER | Glow plugs are heating for cold start; on the RT-40 this typically stays on for 3-6 seconds below 15°C. | Wait until the light goes out before cranking the engine. | |
| Low Fuel | AMBER | Fuel level is low; the RT-40's tank holds about 40 liters, so refuel soon to avoid air in the system. | Refuel as soon as possible to prevent engine stalling. | |
| High Beam | BLUE | High beam headlights are on; they provide extra visibility but can blind other operators. | Switch to low beam when other equipment is nearby. | |
| Work Lights | GREEN | The front or rear work lights are illuminated, aiding visibility during night operation. | Turn off when not needed to conserve battery. | |
| DPF / Regeneration | AMBER | The diesel particulate filter is clogged and active regeneration is needed to clear it on the RT-40. | Drive at high load or initiate parked regeneration per operator manual. |
12 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
- Radiator blocked by debris
- Faulty thermostat or water pump
What to do
On the RT-40, stop the engine immediately and allow it to cool. Clean the radiator core with compressed air, check coolant level, and inspect hoses for leaks.
Low Hydraulic Oil
Common causes
- Leak in hydraulic lines or fittings
- Damaged hydraulic cylinder seal
- Contaminated or old oil
What to do
Park the RT-40 on level ground, check the sight glass, and top up with ASV approved hydraulic fluid. Inspect all hoses for leaks before resuming work.
High Hydraulic Temperature
Common causes
- Prolonged heavy use in hot conditions
- Clogged hydraulic cooler
- Low oil level
What to do
Reduce load and run engine at idle to cool down. Clean the cooler fins and ensure the cooling fan is operational.
DPF Clogged
Common causes
- Excessive idling
- Short duty cycles preventing regen
- Poor fuel quality
What to do
Drive the RT-40 at high engine speed (above 2200 RPM) for 20 minutes to initiate active regeneration. If light persists, perform a parked regeneration as per the manual.
Electrical System Failure
Common causes
- Loose battery terminals
- Failed alternator
- Corroded ground connections
What to do
Check battery cables for tightness and corrosion. If voltage remains low, test the alternator output (should be 13.5-14.5V at idle).
Frequently Asked Questions
What does the amber 'check engine' light mean on my RT-40?
It indicates a fault in the engine management or exhaust aftertreatment system. Common causes are DPF pressure sensor issues or oxygen sensor readings. Have the codes read by a dealer.
How do I perform a DPF regeneration on the ASV RT-40?
First, ensure the machine is in a well-ventilated area. Press and hold the regeneration button (if equipped) for 3 seconds while engine is at low idle. The process takes about 20 minutes.
What hydraulic fluid does the RT-40 use?
ASV recommends 10W-30 or 15W-40 engine oil meeting API CF or higher for the hydraulic system. Do not use automatic transmission fluid.
Why does my RT-40's parking brake light stay on even when disengaged?
The parking brake switch may be faulty or the brake linkage needs adjustment. Check the switch at the pedal and inspect the cable for binding.
What is the normal operating temperature for the RT-40?
The coolant temperature gauge should stay between 80-95°C (175-203°F). If it exceeds 100°C, stop and investigate.
How often should I check the engine oil level on the RT-40?
Check the dipstick daily before starting the engine. The RT-40 holds about 5.5 liters of oil (with filter). Top up if below the low mark.