As temperatures rise during the summer months, diesel forklifts face unique challenges, including overheating, increased wear, and potential fuel system issues. Proper maintenance is crucial to ensure optimal performance, prevent breakdowns, and extend the lifespan of your equipment. Here are essential summer maintenance tips for internal combustion diesel forklifts:

1. Monitor Cooling System & Prevent Overheating

Diesel engines generate significant heat, and summer temperatures can push cooling systems to their limits. To avoid overheating:

• Check coolant levels regularly and top up if necessary.

• Inspect hoses and radiator fins for leaks or blockages.

• Clean the radiator to remove dust, debris, and insects that can restrict airflow.

• Ensure the cooling fan is functioning properly.

2. Maintain Proper Engine Oil Levels

High temperatures can cause engine oil to break down faster, reducing lubrication efficiency.

• Use high-quality diesel engine oil with the correct viscosity (check manufacturer recommendations).

• Change oil and filters at recommended intervals to prevent sludge buildup.

3. Fuel System Care

Diesel fuel can degrade in hot weather, leading to clogged filters and injector problems.

• Use summer-grade diesel to prevent fuel gelling (less critical than winter but still important).

• Drain water separators regularly to avoid moisture buildup.

• Replace fuel filters as scheduled to maintain smooth engine performance.

4. Battery Maintenance

Heat accelerates battery fluid evaporation and corrosion.

• Check electrolyte levels (for non-sealed batteries) and top up with distilled water if needed.

• Clean terminals to prevent corrosion buildup.

• Ensure proper charging—overcharging in heat can damage batteries.

5. Tire Inspection

Hot surfaces increase tire wear and the risk of blowouts.

• Check tire pressure regularly—underinflated tires generate excess heat.

• Inspect for cracks or uneven wear, especially in solid tires.

• Avoid overloading, which puts additional strain on tires.

6. Hydraulic System Check

Hydraulic fluid thins in high heat, affecting lifting performance.

• Monitor hydraulic fluid levels and top up if low.

• Look for leaks in hoses and seals.

• Change hydraulic filters as recommended.

7. Operator Awareness & Safe Usage

• Train operators to recognize early signs of overheating (e.g., warning lights, unusual noises).

• Schedule breaks during extreme heat to prevent engine strain.

• Keep the forklift in shaded areas when not in use to reduce heat exposure.

Conclusion:

Summer heat can take a toll on diesel forklifts, but proactive maintenance helps avoid costly downtime and repairs. By following these tips—focusing on cooling, lubrication, fuel quality, and tire care—you can keep your forklifts running efficiently all season long.