The JLG 1350SJP instrument cluster provides critical warnings and indicators for safe operation of this 135-foot telescopic boom lift. Understanding these lights helps prevent downtime and ensures operator safety.
JLG 1350SJP Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical system fault has occurred that requires immediate engine shutdown or operator action to prevent damage or personal injury on the JLG 1350SJP. | Stop the machine immediately, note any additional warning lights, and consult the operator manual before resuming operation. | |
| Master Caution | AMBER | A non-critical system issue is present that may require attention soon, such as a hydraulic filter restriction or a minor electrical fault on the JLG 1350SJP. | Reduce operation and inspect the machine; check the corresponding subsystem warning for details. | |
| Check Engine (MIL) | AMBER | The engine control module has detected an emissions or performance-related fault in the diesel engine of your JLG 1350SJP. | Have the engine diagnosed by a certified technician; continued operation may lead to derate or shutdown. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped below the safe threshold, risking engine damage on the JLG 1350SJP. | Shut down the engine immediately and check oil level; do not restart until the issue is resolved. | |
| Battery / Charging | RED | The charging system is not functioning properly, and the battery voltage is too low to sustain normal operation of the JLG 1350SJP. | Stop the machine and inspect battery connections and alternator belt; recharge or replace battery as needed. | |
| Coolant Temperature | RED | Engine coolant temperature has exceeded the safe limit, which can cause engine overheating and damage on the JLG 1350SJP. | Immediately idle the engine or shut down; check coolant level and radiator for blockages. | |
| Hydraulic System | AMBER | A general hydraulic system fault has been detected, such as low pressure or high temperature, affecting boom or drive functions on the JLG 1350SJP. | Reduce hydraulic load and inspect fluid level and filters; call for service if the light remains on. | |
| Overload / Capacity | RED | The platform or boom has exceeded the rated load capacity, posing a tip-over risk on the JLG 1350SJP. | Remove excess weight immediately; do not operate until the load is reduced to safe limits. | |
| Mast / Lift Limit | AMBER | The boom is approaching or has reached its maximum extension or angle limit for safe operation on the JLG 1350SJP. | Retract or lower the boom slightly to stay within the working envelope. | |
| Swing / Slew Lock | GREEN | The turntable swing lock is engaged, preventing rotation of the upper structure on the JLG 1350SJP. | Release the swing lock before rotating, or keep engaged for transport. | |
| Seat Belt | RED | The operator's seat belt is not fastened; this is a critical safety requirement for the JLG 1350SJP. | Fasten your seat belt immediately before operating the machine. | |
| Glow Plug / Preheat | AMBER | The glow plugs are heating the engine cylinders for cold start assistance on the JLG 1350SJP. | Wait for the light to turn off before starting the engine. | |
| DPF / Regeneration | AMBER | The diesel particulate filter requires active regeneration to clear soot buildup, which may affect engine performance on the JLG 1350SJP. | Allow regeneration to complete by keeping the engine running; if blinking, contact service. | |
| Low Fuel | AMBER | The fuel level is low, and you should refuel soon to avoid engine starvation on the JLG 1350SJP. | Refill the diesel tank at the next opportunity. | |
| Beacon / Rotating Light | GREEN | The amber rotating beacon is active, indicating the machine is operational in the work area. | Ensure beacon is on when operating in low visibility or near traffic. | |
| Service / Hour Meter | AMBER | The hour meter indicates that scheduled maintenance is due based on engine or system hours on the JLG 1350SJP. | Perform the required service as specified in the operator manual. |
16 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
- Blocked radiator fins
- Faulty cooling fan
What to do
Stop the JLG 1350SJP and let the engine cool. Check coolant reservoir and add if low; clean radiator debris. If persistent, have the thermostat and fan clutch inspected.
Hydraulic System Failure
Common causes
- Low hydraulic oil level
- Clogged return filter
- Internal pump wear
What to do
Shut down and check hydraulic oil level; top up with recommended oil. Replace hydraulic filter if service interval is due. If light remains, contact a JLG service center for pump diagnosis.
Overload Condition
Common causes
- Platform capacity exceeded
- Load shift during operation
- Outriggers improperly set
What to do
Immediately offload excess weight from the platform. Ensure the load is evenly distributed and within the rated capacity. Retract and lower boom to a safe position. Verify outrigger deployment if equipped.
Engine Derate Due to Emissions
Common causes
- DPF soot load high
- DEF fluid low or contaminated
- EGR valve stuck
What to do
Operate the JLG 1350SJP at high engine speed to initiate passive regeneration. If DPF light stays on, perform a parked regeneration per manual. Fill DEF tank with approved fluid. If EGR fault persists, service required.
Battery/Charging System Fault
Common causes
- Loose or corroded battery cables
- Failed alternator
- Bad battery cell
What to do
Check battery terminals for tightness and corrosion (clean if needed). Test battery voltage with engine running; if below 13.5V, alternator may be faulty. Replace battery if it cannot hold charge.
Frequently Asked Questions
What should I do if the Master Warning (Stop) light comes on while operating the JLG 1350SJP?
Immediately stop all machine functions and shut down the engine. Note any other warning lights and refer to the operator manual before restarting. If the issue is unclear, contact JLG technical support.
Why does the amber Master Caution light stay on, but no other lights are lit?
A minor system fault is stored in the controller. This could be a sensor reading out of range or a pending diagnostic code. Have the machine scanned with JLG's diagnostic tool during the next service interval.
How often should the hydraulic oil filter be replaced on the 1350SJP?
JLG recommends replacing the hydraulic return filter every 500 hours of operation, or annually, whichever comes first. The filter is located near the hydraulic tank; always use genuine JLG filters.
Can I operate the JLG 1350SJP with the DPF regeneration light on?
Yes, but the engine will automatically initiate regeneration to clean the filter. If the light flashes, it indicates a fault preventing regeneration, and you should contact service to avoid engine derate or shutdown.
The swing lock light is green; does that mean it's safe to rotate the turntable?
No, a green swing lock light indicates the lock is engaged. To rotate, you must disengage the lock first. The light will turn off when the lock is released. Always ensure the area is clear before swinging.
What does the 'Lift Limit' warning mean and how do I clear it?
It means the boom has reached its maximum safe extension or angle. Gently retract or lower the boom until the light goes out. This protects the machine from structural overload.