The Manitou MT 1840 is a rugged telehandler designed for heavy lifting and precise placement on construction sites. Its instrument cluster provides critical feedback to ensure safe operation and prevent equipment damage. Understanding these indicators is key to maximizing uptime and avoiding costly repairs.
Manitou MT 1840 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | On the MT 1840, a steady red stop light means a critical system failure has occurred, such as engine shut-down or hydraulic pressure loss. | Stop the machine safely, engage parking brake, and consult the operator's manual for the specific fault code. | |
| Master Caution | AMBER | This amber light on the MT 1840 illuminates when any secondary system requires attention, like low hydraulic oil or a dirty air filter. | Check the multifunction display for the specific warning message and address the indicated system. | |
| Check Engine (MIL) | AMBER | On the MT 1840, this light indicates an engine management fault, often related to emissions or sensor readings unique to its Deutz engine. | Reduce load and have the engine diagnosed by a qualified technician using Manitou diagnostic tools. | |
| Engine Oil Pressure | RED | If this light stays on while the MT 1840 is running, oil pressure is dangerously low, risking engine seizure. | Stop engine immediately, check oil level, and inspect for leaks before restarting. | |
| Battery / Charging | RED | On the MT 1840, this light indicates the alternator is not charging or battery voltage is too low for starting. | Check battery connections and alternator belt; if persists, service charging system. | |
| Coolant Temperature | RED | When illuminated on the MT 1840, the engine coolant has exceeded safe operating temperature, often due to heavy load or clogged radiator. | Idle engine, check coolant level, and clean radiator fins; if red, stop and let cool. | |
| Parking Brake | RED | On the MT 1840, this light remains on when the parking brake is engaged and flashes if there's a brake system fault. | Ensure parking brake is fully released before driving; if flashing, have brake system inspected. | |
| Seat Belt | RED | On the MT 1840, this light warns that the operator's seat belt is not fastened, which is required for machine movement. | Fasten seat belt before operating; the light will turn off once buckled. | |
| Glow Plug / Preheat | AMBER | On the MT 1840, this light comes on when the glow plugs are heating the intake air for cold starts, typical for its diesel engine. | Wait for the light to turn off before starting the engine in cold weather. | |
| High Beam | BLUE | On the MT 1840, this blue indicator confirms the high-beam headlamps are active for better visibility in dark worksites. | Use only when appropriate to avoid blinding other operators. | |
| Hydraulic System | AMBER | On the MT 1840, this light signals a problem with the hydraulic system, such as low fluid level or filter blockage. | Check hydraulic oil level and condition; if light remains, inspect for leaks or restricted filters. | |
| Fasten Seat Belt | RED | This light on the MT 1840 reminds the operator to buckle up for safety, and may be accompanied by a audible warning. | Fasten seat belt immediately; machine operation may be restricted if unbuckled. | |
| Work Lights | GREEN | On the MT 1840, this green light indicates that the auxiliary work lights (front or rear) are turned on. | Turn off when not needed to conserve battery and avoid glare. | |
| Overload / Capacity | RED | On the MT 1840, this light illuminates when the load exceeds the rated capacity, activating stability and lift limits. | Reduce load immediately to prevent tipping or structural damage. | |
| Low Oil Level | AMBER | On the MT 1840, this light warns that engine oil level is below the minimum threshold, risking wear. | Park on level ground, check oil dipstick, and add oil if needed. |
15 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheat
Common causes
- Radiator blockage from dust or debris
- Low coolant level due to leaks
- Faulty cooling fan or thermostat
What to do
On the MT 1840, stop engine immediately, let it cool, clean radiator fins, and top off coolant. If recurring, inspect water pump and hoses.
Hydraulic System Failure
Common causes
- Hydraulic oil level low
- Contaminated or broken hydraulic line
- Faulty pump or relief valve
What to do
Check sight glass for oil level; if low, add correct grade (e.g., ISO VG 46). Inspect hoses for leaks. Do not operate until system is serviced to avoid pump damage.
Transmission Malfunction
Common causes
- Low transmission fluid
- Clogged transmission filter
- Faulty solenoid or wiring
What to do
Check transmission fluid level with engine running and warm; add if low. Replace filter per MT 1840 maintenance schedule. Contact dealer if error persists.
Brake System Warning
Common causes
- Low brake fluid level
- Worn brake pads or shoes
- Air in hydraulic brake lines
What to do
Check brake fluid reservoir; if low, fill with DOT 4 fluid. Bleed brakes if pedal feels spongy. Inspect pads for wear; replace if below 5 mm.
Engine Starting Failure
Common causes
- Battery discharged or connections loose
- Glow plug circuit fault in cold weather
- Fuel system air or water contamination
What to do
On the MT 1840, check battery voltage (min 12.4V) and clean terminals. In cold, wait for glow plug light to go out. Drain water separator if water-in-fuel light is on.
Frequently Asked Questions
Why does my MT 1840 show a red stop light with no other warning?
This indicates a critical system fault. Use the onboard diagnostic display to retrieve the fault code, or contact your Manitou dealer, as it may relate to engine or hydraulic safety interlocks.
How do I clear the service hour meter on the MT 1840?
The service interval reset requires a specific sequence: turn key to ON, press and hold the 'Service' button on the cluster for 5 seconds until the wrench icon flashes, then release and press again.
What should I do if the transmission temperature light comes on?
Reduce engine speed and shift to a lower gear to increase torque converter efficiency. If light stays on, park and let the transmission cool; check fluid level when cold.
Can I operate the MT 1840 with the amber master caution light on?
You can continue operation but check the display for the specific warning. Common issues like low DEF or a clogged air filter can be addressed without immediate shutdown.
Why does the work light indicator stay on even after turning them off?
This may be a stuck relay or a faulty switch. On the MT 1840, the work light circuit has a timer; wait 30 seconds. If still on, check the fuse box for relay issues.
How often should I check the hydraulic oil level on the MT 1840?
Daily before operation. With the boom fully lowered and engine off, check the sight glass on the reservoir. Maintain level between the marks; use only Manitou-approved hydraulic oil to avoid seal damage.