The diesel forklift sitting in your yard has years of life left in its frame, its mast, its hydraulics. But its engine is a problem. It emits fumes that force you to ventilate the warehouse. It burns fuel that gets more expensive every year. It rattles and roars and makes everyone near it a little more tired at the end of the day. The obvious solution is to buy a new electric forklift. But there is another way, one that costs less, wastes less, and keeps a perfectly good machine out of the scrap yard. You can convert your existing internal combustion forklift to electric power.
Converting a forklift from diesel, propane, or gasoline to electric is exactly what it sounds like. A skilled technician removes the internal combustion engine, the fuel tank, the exhaust system, and all the components that burn fossil fuels. In their place, the technician installs an electric motor, a battery pack, a controller, and a charger. The rest of the forklift stays the same. The mast, the forks, the hydraulic system, the chassis, the wheels. These components do not care whether they are being pushed by an engine or a motor. They just work.
The result is a machine that looks like your old forklift but behaves like a brand new electric one. It produces zero emissions, so you can run it indoors without ventilation. It runs almost silently, cutting noise by more than half. It costs pennies per hour to operate instead of dollars. And it keeps a heavy piece of machinery out of the landfill, which is a win for the environment that no new forklift can match.
The cost of conversion is surprisingly reasonable. A professional conversion typically runs between twelve thousand and twenty five thousand dollars, depending on the size of the forklift and the capacity of the battery pack you choose. That sounds like a lot of money until you compare it to the price of a new electric forklift, which starts around twenty five thousand dollars and can easily exceed forty thousand dollars for a comparable machine. Conversion saves you thirty to fifty percent off the price of buying new .
The savings do not stop at the purchase price. An electric forklift costs about eight to twelve cents per hour to run, compared to thirty to fifty cents per hour for diesel or propane . Over a year of daily use, that difference adds up to thousands of dollars. Maintenance costs drop just as dramatically. An internal combustion engine needs oil changes, air filters, fuel filters, spark plugs, cooling system service, and exhaust system repairs. An electric motor has one moving part. It needs nothing. Annual maintenance on a diesel forklift might run twelve hundred dollars or more. On a converted electric, you might spend four hundred dollars, mostly on hydraulic fluid and tire rotations . Over five years, the combined fuel and maintenance savings from a conversion can reach eighteen thousand dollars or more per forklift .
The battery is the heart of any conversion, and the choice of battery chemistry matters enormously. Lead acid batteries are cheaper upfront but heavy, slow to charge, and short lived. They need regular watering and equalizing, and they only last three to five years in daily use. Lithium iron phosphate batteries, often called LFP or LiFePO4, cost more initially but last eight to ten years, charge in one to two hours instead of eight, and require no maintenance at all . For a forklift that works every day, lithium is almost always the better choice. The higher upfront cost pays back quickly in reduced downtime and eliminated battery maintenance.
A typical conversion uses a forty eight volt or eighty volt lithium battery pack with a capacity of two hundred to four hundred ampere hours. That size battery will power a three ton forklift for a full eight hour shift under normal use . If your operation runs multiple shifts, lithium batteries offer an advantage that lead acid cannot match. They can be opportunity charged during lunch breaks and other downtime without damaging the battery. A thirty minute charge during the operator's lunch break adds enough power to finish the shift. With lead acid, opportunity charging shortens battery life dramatically, forcing you to swap batteries or buy spares.
The conversion process itself takes a professional team about three to five days per forklift . The old engine comes out first, along with the fuel tank, exhaust, radiator, and all associated plumbing and wiring. The technician then installs a battery tray, usually in the same compartment where the engine used to sit. The electric motor bolts to the existing transmission or directly to the drive axle, depending on the forklift's design. The controller, which manages power flow from the battery to the motor, mounts somewhere accessible for service. The charger gets mounted on the forklift itself or left as a stationary unit on the wall, depending on your preference for onboard versus offboard charging.
The hydraulic system needs attention during the conversion. On a diesel forklift, a belt driven hydraulic pump runs off the engine to power the lift and tilt functions. On the electric conversion, that pump gets replaced with an electric hydraulic power unit, a compact assembly that combines a motor, pump, and reservoir into one package . This unit runs independently of the traction motor, drawing power from the same battery pack. It only runs when the operator lifts or tilts, saving energy when the forklift is just driving.
Weight distribution changes during a conversion, and this requires careful engineering. A diesel forklift carries a heavy cast iron counterweight at the rear to balance loads on the forks. The engine itself also contributes to that balance. When you remove the engine and replace it with a battery pack, the total weight shifts. A lithium battery pack typically weighs less than the engine it replaces, which means the forklift may become too light in the rear . The solution is either to add ballast to the counterweight or to choose a larger battery pack that brings the weight back up. A professional conversion shop will calculate the exact weight distribution before cutting any metal.
Not every forklift is a good candidate for conversion. The machine should have a structurally sound frame, a working hydraulic system, and a mast that lifts smoothly. Worn out forklifts with cracked frames or leaking hydraulic pumps are better sent to the scrap yard. But a forklift with a tired engine and everything else in good shape is an ideal candidate. The conversion essentially gives that machine a new lease on life, replacing its most failure prone component with something far more reliable.
Some manufacturers have noticed the demand for conversions and started offering factory supported options. EP Equipment's EFXZ series takes used internal combustion forklifts, completely remanufactures them, and installs a lithium ion electric drivetrain. The result is a forklift that looks and performs like new but costs significantly less and carries a much lower environmental footprint . The company estimates that replacing a three ton diesel forklift with one of its remanufactured electric models reduces annual carbon emissions by nearly seven thousand kilograms, the equivalent of planting four hundred trees .
Other companies offer conversion kits that allow you to do the work in house or with a local mechanic. These kits include the motor, battery, controller, charger, and all necessary wiring and brackets. The installation requires mechanical and electrical skills but is within reach of a well equipped shop. The patent literature shows that interchangeable power system kits are being developed, allowing the same chassis to accept either an internal combustion engine or a battery pack depending on the user's needs . This approach allows a single forklift design to serve both markets, simplifying manufacturing and parts inventory.
The regulatory landscape is pushing more companies toward conversion. In many regions, older diesel forklifts face restrictions on where they can operate. Some cities ban them entirely from indoor use. Emissions standards for non road equipment are tightening, and older engines that were legal when new are now effectively prohibited from many job sites . Converting these machines to electric not only makes them legal again but often makes them more valuable than they were when new.
The environmental case for conversion is compelling even without regulations. Manufacturing a new forklift requires mining raw materials, refining them into components, assembling those components into a machine, and shipping that machine across the world. That process produces many tons of carbon dioxide before the new forklift ever lifts its first pallet. Converting an existing forklift avoids most of that embedded carbon. The old machine stays in service. The new machine never gets built. The environment wins twice, once from the emissions saved during operation and again from the emissions never created during manufacturing.
The practical realities of conversion deserve honest attention. Not every mechanic knows how to work on high voltage systems. You will need training or a service contract with a shop that has the necessary expertise. The charging infrastructure for a converted forklift is the same as for any electric forklift, a dedicated circuit with a matching charger plug. But if you are converting multiple forklifts, you may need to upgrade your facility's electrical service to handle the additional load. A ten forklift depot with fast chargers can draw three hundred kilowatts or more, triple what a diesel fleet requires . That is not an impossible hurdle, but it is a real cost that belongs in your planning.
The lifespan of a converted electric forklift is impressive. The lithium battery will last eight to ten years in normal use, cycling thousands of times before its capacity degrades noticeably. The electric motor will outlast the rest of the machine. The mechanical components, the mast, the axles, the steering, are the same ones that have been proven for decades. A well converted forklift will easily outlive a new internal combustion engine because it has no engine to wear out .
Some companies worry that converting a forklift is a compromise, that a converted machine will never perform as well as a purpose built electric. That fear is understandable but outdated. The electric motors used in conversions produce instant torque that exceeds what the original diesel engine could deliver. The forklift accelerates faster and responds more crisply to the controls. The lifting speed is the same or better because the electric hydraulic pump provides consistent pressure regardless of engine speed. In many ways, a converted forklift outperforms the original .
The decision to convert or replace comes down to the condition of the forklift and your long term plans. If your diesel forklift has a solid frame, good hydraulics, and a mast that lifts straight, conversion is likely the smarter financial choice. If the forklift is beaten up, with worn out steering, leaking wheel cylinders, and a bent mast, let it go. Buy a new electric forklift or find a better candidate for conversion. The key is honesty about the machine's condition. Conversion fixes the engine problem. It does not fix everything else.
The future of forklift power is clearly electric. Battery prices continue to fall. Charging infrastructure continues to spread. Emissions regulations continue to tighten. The only question for most fleet owners is how to get from where they are to where they need to be without spending a fortune. Conversion answers that question. It takes the forklift you already own, the one your operators already know, the one that fits your racks and your aisles, and it makes that machine electric. No re engineering of your workflow. No retraining of your operators on unfamiliar controls. Just a quieter, cleaner, cheaper version of the forklift you have trusted for years.
That is the quiet genius of conversion. It does not ask you to change your operation. It only asks you to change your power source. And in a world where every business is being asked to do more with less, that is an offer worth taking. The diesel forklift in your yard is not a problem to be replaced. It is a platform waiting to be upgraded. Give it an electric heart, and it will work for another decade. Quietly. Cleanly. Profitably.