Propane Forklift Guide: Practical Tips for Using and Buying One
A propane forklift is an internal combustion forklift that runs on a removable propane cylinder mounted at the back of the truck. It’s popular for its steady power, fast refueling by simply swapping the cylinder, and its ability to move between the warehouse and the yard. On the other hand, it needs good ventilation indoors, careful cylinder handling and regular engine maintenance. Browse our pneumatic propane forklifts for examples of configurations.
How does a propane forklift work?
Liquid propane stored in the cylinder goes through a regulator that turns it into gas and controls its pressure, then feeds the engine the way gasoline would. The engine drives the transmission and the hydraulic pump that operates the mast. The principle is close to a vehicle engine, with a fuel system adapted for gas.
Some models are dual-fuel, meaning they can run on gasoline or propane. At Toyota, for example, the 8FGU series covers pneumatic gasoline/propane forklifts. On most propane forklifts, the cylinder sits horizontally at the back, on a swing-down or fixed bracket behind the operator’s seat.
Cushion or pneumatic propane forklift: which one should you choose?
Choose a cushion-tire propane forklift if you work mostly indoors on smooth concrete, and a pneumatic model if the truck spends a good part of its time in the yard. These aren’t two tire options on the same truck, but two different designs, often called Class 4 (cushion) and Class 5 (pneumatic) in the industry.
| Criterion | Propane on cushion tires | Propane on pneumatic tires |
|---|---|---|
| Main surface | Smooth concrete, warehouse floors, docks | Asphalt, gravel, yards, job sites |
| Footprint | More compact, tighter turning radius | Wider and taller |
| Ground clearance | Low | Higher, handles uneven ground better |
| Winter and snow | Poorly suited | Suited, with cleared paths |
| Typical use | Ventilated warehouse, dock loading, heavy indoor use | Lumber yards, building materials, back and forth between yard and warehouse |
Our article on pneumatic vs cushion forklift tires explains why you can’t switch from one version to the other just by changing the tires.
When is propane a good choice?
Propane works well for businesses that work both indoors and outdoors, run multiple shifts, or don’t want to manage a battery charging room. Refueling means swapping the cylinder, so the truck isn’t parked while it recharges.
- Indoor and outdoor work: a pneumatic propane forklift goes from the yard to the dock without changing machines, as long as the building is well ventilated.
- Multiple shifts: a full cylinder puts the truck back in service in a few minutes.
- Medium to heavy loads: the combustion engine delivers steady power until the cylinder is almost empty.
- Sites without suitable electrical infrastructure: no charger or charging area to plan for.
Propane is less suited to closed, poorly ventilated spaces, enclosed cold rooms, or settings where you want zero emissions, such as some food warehouses. In those cases, an electric forklift is usually the better fit. For small loads indoors, an electric pallet stacker may also be enough.
How do you change and store a forklift propane cylinder?
The cylinder must be changed by a trained person, with the engine off, in a ventilated area, following the instructions of the forklift manufacturer and the propane supplier. It’s a simple job when done right, but propane is a flammable gas that’s heavier than air: treat it with care.
- Turn off the engine and close the cylinder valve. Let the engine burn off the gas left in the line if the manufacturer recommends it.
- Wear the required protective equipment. Liquid propane can cause cold burns on contact with skin; gloves and safety glasses are generally recommended.
- Disconnect the fitting and remove the empty cylinder using safe lifting techniques: a full cylinder is heavy.
- Install the full cylinder in the intended orientation. Most brackets have a locating pin or mark that positions the valve correctly.
- Reconnect, open the valve and check for leaks using the method recommended by the supplier. A lingering gas smell means you don’t start the truck.
Storing cylinders, full or empty, is governed by specific rules on location, protection and distance from exits and heat sources. In Quebec, propane handling and storage fall under the CSA B149.2 standard and the Régie du bâtiment du Québec, among others. Your propane supplier can tell you which requirements apply to your site.
Can you use a propane forklift indoors?
Yes, propane forklifts are commonly used indoors, as long as ventilation is adequate and the engine is properly maintained and tuned. Like any combustion engine, it produces carbon monoxide, a colorless and odorless gas. A poorly tuned engine produces more of it.
- Ventilation: air exchange must match the size of the building and the number of combustion units running.
- Engine maintenance: regular tune-ups on the manufacturer’s schedule keep emissions down.
- Monitoring: some businesses measure air quality, especially in winter when doors stay closed.
- Symptoms to take seriously: headaches, dizziness or nausea among employees should lead to an immediate check.
The exact air quality and ventilation requirements in Quebec come from the CNESST. Check with them, and with your forklift’s manual, for the rules that apply to your situation.
What maintenance does a propane forklift need?
Maintaining a propane forklift combines combustion engine care with care of the gas fuel system, on top of the usual checks on the mast, hydraulics and brakes. The exact schedule is set by the manufacturer, usually based on operating hours.
- Engine: oil changes, air filter, spark plugs, belts and coolant.
- Fuel system: condition of the regulator, lines and fittings, and no leaks.
- Cylinders: damaged or rusted cylinders, or cylinders past their requalification date, must be taken out of service by the supplier.
- Daily inspection: a check before every shift, including sniffing for gas, is good practice.
What should you check before buying a used propane forklift?
Besides the usual items like the mast, forks and hydraulics, focus on the engine and fuel system: starting, smoke, leaks and the condition of the regulator. The table below groups the checks specific to a propane forklift.
| Item | What to check | Warning sign |
|---|---|---|
| Starting | Clean cold start, steady idle | Hard starting, rough idle, stalling |
| Fuel system | Regulator, lines, cylinder fitting | Gas smell, frost on a line, damaged fitting |
| Cylinder bracket | Mounting, locating pin, straps | Bent bracket, missing strap |
| Engine | Noise, smoke, temperature | Knocking, blue or black smoke, overheating |
| Fluids | Engine oil, coolant, transmission oil | Black oil, or oil mixed with coolant |
| Exhaust | Muffler and mounts | Exhaust leak, unusual noise |
| History | Hours, oil changes, engine tune-ups | No engine maintenance history |
For the full list, which also covers the mast, chains, forks and the load test, see our used forklift inspection checklist.
Frequently asked questions about propane forklifts
How long does a forklift propane cylinder last?
It depends on the cylinder size, the engine, the loads you handle and the pace of work. A truck lifting heavy loads all day uses more than one used on and off. The most reliable approach is to track your actual consumption for a few weeks and keep a full spare cylinder on hand.
Does a propane forklift work well in winter?
Yes, it’s a common choice for outdoor work in Quebec. In extreme cold, the propane pressure in the cylinder drops, which can make starting harder. Store cylinders according to the applicable rules and follow the manufacturer’s recommendations for cold-weather use.
Who can change a forklift propane cylinder?
Only a person trained in handling propane cylinders should do it. Training covers shutting off the engine, closing the valve, positioning the cylinder correctly and checking for leaks. Your propane supplier and your operator trainer can tell you which requirements apply.
Can you convert a gasoline forklift to propane?
Many forklifts are designed from the factory to run on gasoline and propane. Converting a truck that isn’t must be assessed with the manufacturer or a qualified technician, because it affects the fuel system and safety. It’s often simpler to choose a truck already set up for propane.
Is a used propane forklift a good buy?
Yes, if it has been inspected and maintained. The engine and fuel system are the key items to check. At A1 Machinery, every unit is inspected and certified by our mechanics and sold with a parts and labor warranty. See our return and warranty policy for the details.
Where do you start?
Figure out where the forklift will spend most of its time, indoors, in the yard or both, and whether your building is well ventilated. Those two answers tell you whether propane is the right choice, and whether you need a cushion or pneumatic version.
- Pneumatic propane and diesel forklifts: for yards and outdoor work
- Electric forklifts: for enclosed spaces or zero emissions
- A1 Machinery’s full forklift inventory
Since 1991, A1 Machinery has sold new and used forklifts, with over 700 units inspected and certified by our mechanics. Lease financing is available. To find the right propane forklift for your site, contact an A1 Machinery advisor or call (450) 467-2224. We’re located at 3225 rue de l’Industrie in Saint-Mathieu-de-Beloeil, Quebec.