Bobcat Warning Light Symbols: What Each Indicator Means
Every warning light on a Bobcat skid steer or compact track loader decoded, with the correct action for each.
Bobcat Warning and Indicator Lights
Modern Bobcat machines group their indicators into three categories by color. Red lights are stop-now warnings: engine oil pressure, coolant temperature, and hydraulic charge pressure require you to shut down immediately and investigate before restarting. Amber lights are service-soon cautions: clogged air filter, water in the fuel separator, and high hydraulic oil temperature mean address the issue before the next shift or, in some cases, within the current hour of work. Green and blue status lights confirm that a system is active - parking brake engaged, seat bar down, glow plugs preheating, work lights on.
The table below covers 16 of the most common lights found across current Bobcat skid steer and compact track loader models. Symbols are consistent across the S- and T-series; the exact dashboard position varies by cab generation.
Engine Oil Pressure
Engine oil pressure has dropped below the minimum safe operating level. Continuing to run the engine risks bearing and crankshaft damage within seconds. Shut the engine down immediately. Check the oil level with the dipstick. If the level is correct and the light returns on restart, do not run the machine - have it inspected for a failed oil pump or blocked pickup.
Engine Coolant Temperature
Coolant temperature has exceeded the safe limit. The engine is at risk of head gasket failure or warped cylinder head if operation continues. Stop work, move to a safe area, and shut down. Let the engine cool before opening the coolant reservoir. Check coolant level, inspect for leaks, and verify the radiator and oil cooler screens are clear of debris.
Hydraulic Charge Pressure
Hydraulic system charge pressure is critically low. This can indicate a failed charge pump, blocked filter, or low hydraulic fluid level - any of which will damage the drive system rapidly. Stop travel and loader movement immediately. Check the hydraulic fluid level and inspect for visible leaks. If fluid level is correct, the charge pump or a filter may need service.
Hydraulic Oil Temperature
Hydraulic fluid is running hotter than the recommended operating range. Hot oil thins out, reducing lubrication and damaging seals and pump components. Reduce the workload, lower the boom, and allow the machine to idle for several minutes. Check that the hydraulic oil cooler screen is clean. If the temperature does not drop, stop work for the day and identify the root cause.
Battery / Charging System
The alternator is not producing sufficient charge to maintain battery voltage, or battery voltage has dropped below the minimum threshold. Finish the current cycle safely and shut down. Check the alternator belt for wear or slipping, inspect battery terminals for corrosion, and test charging output. Running the machine with a failed charging system will eventually result in a complete electrical shutdown.
Glow Plug Preheat
The diesel glow plugs are warming the pre-combustion chambers before startup. This is a normal part of the cold-start sequence on all Bobcat diesel engines. Wait for the light to turn off before engaging the starter. In cold weather this can take 10-15 seconds. Do not crank the engine while the light is on - doing so can damage the glow plugs and increase white smoke at startup.
Low Fuel
Fuel level in the tank has dropped to the reserve threshold. Bobcat machines can experience fuel system air ingestion if run completely dry, requiring bleeding of the injector lines to restart. Refuel at the earliest safe opportunity. Do not run the tank to empty. If the machine dies from fuel starvation, the fuel system will need to be primed and bled before restart.
Air Filter Restriction
The intake air filter is clogged or restricted beyond the safe operating limit. A restricted filter starves the engine of air, reducing power and increasing fuel consumption and exhaust smoke. Inspect the primary air filter element. Clean with compressed air (blow from the inside out) or replace the element. Also check that the pre-cleaner and air inlet are free of debris.
Water in Fuel
The fuel/water separator has detected water in the fuel system. Water in diesel can damage injectors and cause rough running or hard starting. Drain the water separator as soon as possible - there is typically a drain screw at the bottom of the filter bowl. Investigate where the water is entering: a cracked fuel cap seal or contaminated fuel supply are the most common causes.
Fuel Filter Restriction
The primary fuel filter is restricted, limiting fuel flow to the injection system. This can cause power loss, rough running, or hard starting. Replace the fuel filter element. Bobcat diesel machines use a spin-on or cartridge filter depending on the model year. Check the service interval in the operator manual and replace on schedule to prevent recurrence.
DPF / Diesel Particulate Filter
The exhaust after-treatment system on Tier 4 Final models needs to regenerate - burning accumulated soot out of the diesel particulate filter. A steady amber light means passive regen is occurring. A flashing light or red DPF indicator means a parked (forced) regen is required. For a steady amber light, continue normal operation - passive regen happens automatically. For a flashing amber or red DPF light, park the machine in a clear area away from flammable material, engage the parking brake, and initiate a parked regen from the instrument panel as described in the operator manual.
Parking Brake Engaged
The parking brake is set. On newer Bobcat models with electronic parking brake systems, this light confirms the brake is locked. The machine will not allow travel movement while this light is on. Release the parking brake before attempting to move the machine. If the light stays on after releasing the brake control, inspect the brake system for a mechanical or sensor fault.
Seat Bar / Operator Restraint
The seat bar (lap bar) is lowered and the operator restraint interlock is active. This green light confirms the safety interlock circuit is closed - a prerequisite for loader and travel controls to function. No action needed - this light is a normal operational status indicator. If the seat bar is down but the light does not appear, the interlock switch may be faulty and should be inspected before operating the machine.
Service / Engine Fault
The engine management system has detected a fault that has been logged as a diagnostic trouble code. The machine may continue to run, but performance could be degraded. Note any changes in machine behavior. Connect a Bobcat service tool or compatible diagnostic scanner to read the active fault code. Common causes include sensor faults in the fuel, air, or emissions systems.
High Exhaust Temperature
Exhaust gas temperature downstream of the DPF has reached a high threshold, typically during an active parked regen cycle or under sustained heavy load. During a parked regen, this is expected - keep the area around the exhaust outlet clear. During normal operation, reduce engine load. If the light appears repeatedly without a regen event, have the after-treatment system inspected.
Work Lights Active
The auxiliary work lights are switched on. This is a simple status indicator confirming the lights are energized. No action needed. Switch the work lights off when not required to reduce electrical load on the charging system.
Your questions answered
What does it mean when the Bobcat engine oil pressure light comes on while working?
Stop the machine immediately and shut the engine off. Low oil pressure during operation usually means the oil level is critically low, the oil pump has failed, or there is a blockage in the oil circuit. Running the engine even briefly with low oil pressure can destroy the main bearings. Check the dipstick once the engine cools, top up if needed, and restart to see if the light clears. If it returns, do not operate the machine until it has been inspected by a technician.
Is it safe to keep working when the Bobcat hydraulic oil temperature light comes on?
Not without reducing the workload first. The amber hydraulic temperature light means fluid is overheating - a condition that degrades lubrication and accelerates wear on pumps, motors, and seals. Lower the boom, reduce cycle speed, and idle the machine for five to ten minutes. Make sure the hydraulic cooler screen is clear of debris. If the temperature does not drop, stop for the day and investigate before the next use.
My Bobcat DPF light is flashing - what do I do?
A flashing DPF light means the diesel particulate filter has accumulated too much soot for passive regeneration to clear on its own, and a forced parked regen is required. Park the machine on a flat, clear surface away from anything flammable - the exhaust outlet gets very hot during the process. Engage the parking brake, keep the engine running, and follow the parked regen procedure in your operator manual (typically a button hold or menu selection on the instrument panel). The cycle takes 20 to 40 minutes. Do not shut the engine off during an active regen.
Why does the glow plug light stay on for so long in cold weather?
Bobcat diesel engines use glow plugs to heat the pre-combustion chamber before the starter engages, and preheat time increases as ambient temperature drops. In temperatures near or below freezing, the preheat cycle can run for 15 to 20 seconds before the light goes out. This is normal. Cranking the engine before the light turns off risks hard starting and can shorten glow plug life. Wait for the light to extinguish, then start the engine normally.
What should I check first if multiple warning lights come on at once on my Bobcat?
Multiple lights activating simultaneously often points to a shared cause - most commonly a charging system failure (battery light plus other electrical warnings), a sudden loss of hydraulic fluid, or a low battery at startup causing erratic instrument panel readings. Start by checking the most critical red-light condition first. If the machine just started and all the lights appear briefly then clear, that is a normal bulb-check sequence. If they stay on, begin with oil pressure and battery, as both affect the entire machine.