The JLG 860SJ is a 86-foot telescopic boom lift with a 500 lb capacity. Its instrument cluster provides essential warnings for engine, hydraulic, and safety systems. Understanding these indicators is crucial for safe operation.
JLG 860SJ Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault has occurred on your JLG 860SJ, requiring immediate engine shutdown and safe parking of the boom. | Safely lower the boom to ground, shut down engine, and consult the service manual or call JLG support. | |
| Master Caution | AMBER | A non-critical fault has been detected in the machine's systems, such as a sensor reading outside normal range. | Check the display for additional warning symbols and schedule service soon; operation may continue with caution. | |
| Check Engine / MIL | AMBER | The engine control unit has detected an emissions or performance issue in the JLG 860SJ's diesel engine. | Have the engine diagnostics read by a qualified technician; continued operation may reduce performance. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below safe operating level in your JLG 860SJ, risking engine damage. | Immediately shut down the engine, check oil level, and inspect for leaks before restarting. | |
| Battery / Charging | RED | The JLG 860SJ's alternator is not charging the battery or the battery voltage is critically low. | Check alternator belt and battery connections; if persistent, replace battery or alternator. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded safe limits, potentially causing overheating on the JLG 860SJ. | Stop the engine, allow it to cool, then check coolant level and radiator for obstructions. | |
| Hydraulic System | AMBER | The hydraulic oil temperature or pressure is outside normal range, affecting boom and drive functions. | Check hydraulic oil level and look for leaks; reduce load and allow system to cool if overheated. | |
| Low Fuel | AMBER | Fuel level in the JLG 860SJ's tank is low; approximately 10% or less remains. | Refuel with diesel fuel to avoid air ingress and engine stalling. | |
| Fasten Seat Belt | RED | The operator's seat belt is not fastened; the JLG 860SJ may disable certain functions until buckled. | Fasten your seat belt immediately before operating. | |
| Overload / Capacity | RED | The platform load exceeds the JLG 860SJ's rated capacity of 500 lbs, triggering an overload condition. | Remove excess load immediately; the boom will not raise until load is reduced. | |
| Mast / Lift Limit | AMBER | The boom is approaching its maximum extension or angle limit to prevent instability. | Retract or lower the boom slightly to avoid activation of the limit switch. | |
| Swing / Slew Lock | GREEN | The turntable swing lock is engaged, preventing rotation of the upper structure. | Disengage the swing lock before attempting to rotate the boom. | |
| Work Lights | GREEN | The work lights on the JLG 860SJ are turned on for improved visibility. | No action needed; turn off when not required to conserve battery. | |
| Beacon / Rotating Light | BLUE | The rotating beacon is active, indicating the machine is in operation. | Ensure the beacon is visible to surrounding personnel; leave on while operating. | |
| Service / Hour Meter | AMBER | Scheduled maintenance is due based on engine hours (e.g., oil change at 250 hours). | Perform the required service per the JLG 860SJ maintenance schedule. | |
| Glow Plug / Preheat | AMBER | The glow plugs are heating the engine cylinders for cold start on the JLG 860SJ's diesel engine. | Wait for the light to turn off before cranking the engine. | |
| Parking Brake | RED | The parking brake is engaged; the machine will not drive until released. | Release the parking brake before moving the JLG 860SJ. | |
| Brake System | RED | A fault in the braking system has been detected, potentially reducing braking performance. | Stop operation immediately and have brakes inspected by a technician. |
18 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Master Warning (Stop)
Common causes
- Engine overheating
- Low oil pressure
- Hydraulic system failure
What to do
Immediately stop and park the JLG 860SJ safely. Check for associated warning lights and consult the service manual. If unable to resolve, contact JLG support.
Engine Overheat
Common causes
- Low coolant level
- Radiator blockage
- Faulty cooling fan
What to do
Allow engine to cool, then inspect coolant level and radiator fins. Clean debris and top off coolant as needed. If recurring, replace thermostat or fan clutch.
Hydraulic System Overheat
Common causes
- Low hydraulic oil
- Excessive continuous operation
- Clogged oil cooler
What to do
Check hydraulic oil level and condition. Clean the oil cooler core and ensure proper airflow. Allow system to idle to cool down before resuming work.
Overload Condition
Common causes
- Platform load exceeds 500 lbs
- Uneven load distribution
- Carrying long materials extending beyond platform
What to do
Remove excess weight from the platform. Do not attempt to move or raise the boom until load is within rated capacity. Re-distribute load evenly.
Low Engine Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
Shut down engine immediately. Check dipstick and add oil if low. If oil level is fine, inspect for leaks or have the oil pump tested by a mechanic.
Frequently Asked Questions
What should I do if the Master Warning light comes on while operating the JLG 860SJ?
Stop all operations immediately and lower the boom to ground safely. Turn off the engine and check for additional warning lights. Refer to the operator's manual for specific fault codes or contact JLG service.
Why does the hydraulic system warning light blink intermittently on my JLG 860SJ?
This often indicates hydraulic oil temperature is near the limit. Reduce workload and allow the system to cool. Check oil level and ensure the hydraulic oil cooler is clean and unobstructed.
Can I drive the JLG 860SJ with the Check Engine light on?
You may continue short-term operation, but the engine power may be reduced. Have the fault diagnosed as soon as possible to prevent emissions system damage or engine failure.
How do I reset the service hour meter light on my JLG 860SJ?
The hour meter light resets automatically after the scheduled maintenance is performed. Some models require a dealer tool to clear the code after service completion.
What does the swing lock indicator mean?
It means the turntable is locked in position. To rotate the boom, you must disengage the swing lock using the control switch. Never attempt to slew with the lock engaged.
Why is the overload light staying on even after removing weight from the platform?
Check for any load cells or sensors that may be stuck or damaged. Also ensure no tools or materials are caught on the platform rails. If the light persists, a sensor recalibration may be needed.