Electric, LPG, or diesel: how to choose a used forklift

Fuel is not a preference. It is the building, the air, the shift pattern, and a line on the invoice that people forget until the battery quote arrives. Pick the fuel that can legally and practically live where the truck will work. Then read the band for that class on the price book. Then tell us the week.

OSHA sorts powered industrial trucks into designations, not marketing names. The list in 29 CFR 1910.178(b) includes D and DS for diesel, LP and LPS for liquefied petroleum gas, and E, ES, EE, and EX for electric. The designation is about fire safeguards for the location, not about which truck is "more modern." If your building has a hazardous location, the designation on the truck has to match the classification of the room. OSHA's eTool on enclosed and hazardous areas is the short version, and the standard is the long one.

Where each fuel earns its keep

Use the jobs already on the book. They are how this desk sorts requests, and they keep the conversation honest.

• LP cushion, 5,000 lb ($11,500 to $22,000): the volume indoor warehouse truck. Fast to refuel. It still makes exhaust.
• LP pneumatic, 5,000 lb ($14,000 to $24,000): yards, lumber, mixed indoor and outdoor. Pneumatic trucks sit a step above the same-year cushion unit.
• Electric sit-down, 5,000 lb ($12,000 to $28,000): food, clean plants, multi-shift floors. Quote the battery and charger as their own line.
• Three-wheel electric, 3,000 lb ($7,500 to $14,500): trailers, tight docks, light picks. A tired battery can erase the whole discount.
• Reach and order picker: electric by class. Mast height, guidance, and the battery dominate the price. Bands are $9,000 to $22,000 for reach and $8,000 to $18,000 for a picker.
• Rough terrain ($18,000 to $55,000): diesel, jobsites and unimproved ground. The band is wide because the machines are not the same.
• 8,000 to 12,000 lb ($22,000 to $48,000): mixed fuel. Name the fuel. Do not let a dealer average it away.

Exhaust, carbon monoxide, and indoor LP

Internal combustion trucks get refueled quickly and they need leak checks. OSHA's eTool on internal combustion power says they are used indoors, and that indoor use can increase exposure to exhaust and noise. The same page says not to operate where vapors can concentrate, and it treats a poorly combusting engine as a carbon monoxide problem.

The rule itself is short. 29 CFR 1910.178(i) says concentration levels of carbon monoxide gas created by powered industrial truck operations shall not exceed the levels specified in 1910.1000. Training has to cover closed environments where poor ventilation or poor maintenance could cause a buildup of carbon monoxide or diesel exhaust. That topic is listed in 1910.178(l)(3). The eTool's practical line is the one buyers should remember: do not run a gasoline, propane, or diesel engine for long periods in a confined space such as a trailer, do not run a combustion engine in a warehouse or plant without adequate ventilation, and consider a battery truck where the work is in poorly ventilated spaces.

One OSHA accident summary, number 14354013, describes five employees overexposed to carbon monoxide in a refrigerated warehouse where LP forklifts were operating. The summary says the employer measured two of those trucks over 1,400 ppm, and that measurements were 0 ppm after the employer put battery trucks on the indoor work. That is one report, not a national average. It is enough to refuse "we always run LP inside with the doors shut."

LP fuel handling, without the folklore

OSHA's internal-combustion eTool is plain about LP. Vapor is heavier than air and collects low. It is extremely flammable. Liquid on skin can freeze tissue. Do not refuel in a confined area where vapor could collect. Do not park an LP truck for a long period beside heat, stairs, or an exit. Turn the service valve off when it will sit. Only trained, authorized people replace containers. Storage and handling sit in 29 CFR 1910.110.

Read the charging rule narrowly. Section 1910.110 says industrial trucks equipped with permanently mounted fuel containers shall be charged outdoors. Many forklifts use removable cylinders that are exchanged, not filled on the truck. Exchanging a cylinder is still a trained job. It is not "anyone on the dock." A truck with hard lines, a rusted bracket, or a valve the seller does not want photographed is not a complete LP truck. Put that in the grade.

Electric: the second machine

An electric truck without a known battery is a chassis. The book says to quote the battery and charger as their own line, and that a new battery can cost as much as a rough truck. Ask for battery year, voltage, amp-hour rating if the label has it, and a recent load test or discharge record. "It lasts a shift" is not a test. Connector condition, cable heat, and whether the charger is the one that belongs to that battery matter as much as the paint on the hood.

Charging needs a place, ventilation for the battery room you actually have, and time. A three-shift floor that buys one charger and one tired battery has not bought a three-shift truck. Watering, eyewash, and the ban on open flames around electrolyte are in the OSHA standard. If your people have never run electric, the training topics in 1910.178(l) include charging. Budget the training with the truck. The OSHA primer is the list.

Diesel and rough ground

Diesel earns its place on unimproved ground and on heavy outdoor loads. It does not earn a free pass indoors. The same carbon monoxide rule applies, and diesel exhaust is called out by name in the training topics. Rough terrain is class VII. OSHA's class page says the term does not mean the truck can be operated safely on every surface. Tell the desk the lift height and the ground. Otherwise the $18,000 to $55,000 band is noise, which is what the book already says.

On a purchase walk, cold start the diesel if the seller will allow it. Smoke, a knock, or a radiator that only holds with stop-leak is grade C until the repair is written. Do not let a fresh coat of yellow paint move the truck up the band.

A way to choose without a spreadsheet

1. If the work is mostly inside a closed building, start with electric unless you already ventilate for combustion trucks and can show the air stays inside the 1910.1000 limits.
2. If the work is a normal warehouse dock and you already run LP safely, a 5,000 lb cushion LP is the liquid used market. Band: $11,500 to $22,000.
3. If the truck lives outside or on a mixed yard, look at pneumatic LP before you look at a cushion truck with "it will be fine" tires.
4. If the ground is dirt, broken pavement, or a jobsite, shop rough terrain and name the height.
5. Write the fuel on the request. A request that says "either" usually means the buyer has not walked the building.

Whichever you pick, the inspection still applies. Fuel does not excuse a bent rail. The method grades the iron before anyone is introduced. You pay the yard. Asking the desk is free.