The Hyster S50FT is a rugged LPG-powered forklift designed for demanding warehouse and industrial operations. Its instrument cluster provides operators with clear warnings and system status to maximize safety and uptime. Familiarity with these indicators is essential for efficient and safe forklift operation.
Hyster S50FT Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A serious fault has been detected in a critical system of the S50FT, such as engine or hydraulics. | Safely stop the forklift and investigate the fault immediately. | |
| Master Caution | AMBER | A non-critical issue or warning has been logged that requires attention on the S50FT. | Check the display for further information and address the issue soon. | |
| Check Engine (MIL) | AMBER | The engine management system has detected a malfunction specific to the S50FT’s LPG engine. | Schedule a diagnostic check; avoid heavy loads until resolved. | |
| Engine Oil Pressure | RED | Engine oil pressure has dropped dangerously low, risking severe engine damage. | Shut down the engine immediately and check oil level and leaks. | |
| Battery / Charging | RED | The alternator is not charging the battery, risking forklift shutdown. | Inspect the charging system and battery connections before resuming use. | |
| Coolant Temperature | RED | Engine coolant temperature is excessively high, risking engine overheating. | Stop the forklift, allow it to cool, and check coolant levels. | |
| Transmission Temp | RED | The transmission fluid temperature is above safe limits in the S50FT. | Pause operation to let the transmission cool and inspect fluid levels. | |
| Brake System | RED | A fault has been detected in the primary braking system. | Do not operate the forklift until brakes are inspected and repaired. | |
| Parking Brake | AMBER | The parking brake is engaged or there is a fault with the parking brake circuit. | Release the brake before driving, or check the system if the light stays on. | |
| Seat Belt | AMBER | The operator’s seat belt is not fastened, which is a safety requirement. | Fasten the seat belt before operating the S50FT. | |
| DPF / Regeneration | AMBER | The diesel particulate filter requires regeneration to clear soot buildup. | Perform a parked regeneration as outlined in the operator’s manual. | |
| DEF / AdBlue | AMBER | The DEF (AdBlue) tank level is low, risking engine derate if ignored. | Refill the DEF tank promptly to avoid reduced performance. | |
| Low Fuel | AMBER | The LPG fuel level is low and needs to be refilled soon. | Schedule refueling to prevent unplanned shutdown. | |
| Hydraulic System | AMBER | A hydraulic fault or low fluid level has been detected in the S50FT system. | Inspect hydraulic fluid levels and look for leaks before continuing. | |
| Hydraulic Oil | AMBER | Hydraulic oil temperature is high or oil level is low. | Let the system cool and check oil levels. | |
| Engine Oil Temperature | RED | Engine oil temperature is above the safe range, risking engine damage. | Stop the engine, allow it to cool, and check oil level and condition. | |
| Air Filter | AMBER | The air filter is clogged or restricted, reducing engine performance. | Inspect and clean or replace the air filter. | |
| Fuel Filter / Water Separator | AMBER | The fuel filter is clogged or water is present in the separator. | Drain water and replace the fuel filter as needed. | |
| Service / Hour Meter | AMBER | Scheduled maintenance is due based on the S50FT’s engine hours. | Arrange for scheduled service to maintain reliability. | |
| Work Lights | BLUE | Work lights are switched on for better visibility. | No action needed; turn off when not required to save battery. | |
| Beacon / Rotating Light | AMBER | The beacon is active to alert others of forklift operation. | Ensure the beacon is functioning in high-traffic areas. | |
| Overload / Capacity | RED | The forklift is overloaded or load exceeds rated capacity. | Reduce the load to within the S50FT’s rated capacity. | |
| Low Oil Level | AMBER | Engine oil level is below the minimum safe mark. | Add oil to the correct level before use. | |
| Brake Fluid Level | AMBER | Brake fluid level is low, which can affect braking performance. | Top up brake fluid and check for leaks. |
24 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure
Common causes
- Oil level too low
- Oil pump failure
- Severe oil leak
What to do
Immediately turn off the S50FT engine, check for visible leaks, and top up oil if needed. If the warning persists, have a technician inspect the oil pump and related components before restarting.
Overload / Capacity
Common causes
- Load exceeds forklift rating
- Incorrect load distribution
- Faulty load sensor
What to do
Remove excess weight to ensure the load is within the S50FT’s rated limit. Check the load sensor for faults if the warning stays on after unloading.
Coolant Temperature
Common causes
- Low coolant level
- Radiator blockage
- Faulty thermostat
What to do
Stop the forklift and let it cool down, then check coolant level and inspect for leaks or blockages. If overheating continues, have the cooling system checked by a qualified technician.
Brake System
Common causes
- Worn brake pads
- Low brake fluid
- Hydraulic brake fault
What to do
Do not operate the S50FT until the brake system is inspected. Replenish brake fluid and replace worn components as necessary.
Battery / Charging
Common causes
- Alternator failure
- Loose battery terminals
- Damaged wiring
What to do
Inspect and tighten battery connections and check for damaged cables. If the light remains on, test the alternator output and replace if faulty.
Frequently Asked Questions
What should I do if the DPF regeneration light comes on during operation?
Follow the operator’s manual to perform a parked regeneration; avoid shutting off the S50FT mid-process to prevent filter blockage.
Can I keep operating if the check engine light is on but the forklift seems fine?
While the S50FT may still run, continued use could worsen the issue; schedule diagnostics promptly to avoid damage.
Why does the seat belt light stay on even when buckled?
Check that the seat belt latch is fully engaged and inspect the buckle switch for dirt or damage.
What causes the hydraulic warning light to activate?
Low hydraulic fluid, leaks, or a system fault can trigger this warning; check fluid levels and inspect hoses and cylinders.
How often should I check the fluid levels on the S50FT?
It’s best practice to check engine oil, coolant, brake, and hydraulic fluids daily before starting shifts.