Telehandler load charts: how to read capacity at height without fooling yourself

If you only remember one thing: telehandlers derate as you extend and as you lift. The sticker capacity at the hitch is not the capacity at full boom extension with a pallet three feet forward of center. Job-site near-misses happen when someone treats the machine like a forklift with a fancy stick.

This is one of the most important safety topics in our business, and it is one that does not get enough attention in the used market. When you buy a used telehandler—whether it is a JLG, Genie, CAT, JCB, or Manitou—the load chart is your legal operating envelope. Exceeding it is not just dangerous; it is a liability event that can void your insurance, trigger OSHA citations, and end careers. We take this seriously, and we want our buyers to understand it before they take delivery.

How we walk buyers through a chart

Start from the attachment weight (forks + load), add rigging, then find your operating point: boom angle, reach, and whether you are on tires or stabilizers if equipped. Compare that point to the chart zone—if you are near a line, you are already too close. Wind and off-level operation bite harder than new operators expect.

Let me walk through a concrete example. Say you have a JLG 943 with a maximum capacity of approximately 9,000 lb. At full forward reach (about 30 feet horizontal at ground level), that capacity drops to roughly 2,500–3,000 lb depending on stabilizer deployment. At maximum height (approximately 43 feet) with the boom vertical, the capacity is somewhere in the 4,000–5,000 lb range. But at maximum height AND maximum forward reach simultaneously—which is the position that generates the highest tip-over moment—the capacity might be as low as 1,500–2,000 lb.

That is a 4:1 reduction from the sticker number to the worst-case operating point. If your operator loads 5,000 lb at the hitch and then extends the boom to place it on a third-story scaffold, they may be operating well outside the chart without realizing it. This is especially dangerous with non-palletized loads (pipe bundles, lumber packs, steel beams) where the load center is not always where you expect it.

Load center: the spec everyone forgets

Telehandler load charts are published at a specific load center distance—typically 24 inches from the fork face for North American machines. If your load's center of gravity is farther forward than the chart's assumed load center, the effective capacity is reduced. A 48-inch-deep pallet loaded to 3,000 lb has its center of gravity at approximately 24 inches—right at the chart assumption. A 72-inch-deep lumber pack loaded to 3,000 lb has its CG at approximately 36 inches—50% farther forward than the chart assumes, and the chart capacity no longer applies without a correction.

Some operators "know" this intuitively from years of experience. But new operators, rental customers, and crews that just transitioned from forklifts to telehandlers often do not account for load center. We include load chart documentation with every telehandler we sell through https://equipmentsupplyservice.com, and we encourage buyers to make the chart available to every operator who will run the machine—not filed in the glovebox where it does nobody any good.

Tires vs. stabilizers: two different machines

Some applications keep you on rubber; others require deployed stabilizers for chart credit. Mix those modes and you are outside the manual—meaning insurance and OEM support walk away. We would rather lose a sale than help someone rationalize a half-safe lift plan.

On rubber (free-on-tires operation), the machine is less stable because the tires provide a narrower and more compliant support base. The load chart reflects this with lower capacities across all reach and height combinations. On stabilizers (when equipped and deployed), the support base widens and becomes rigid, allowing higher capacities—sometimes 30–50% higher at equivalent reach and height.

The critical rule is: if you set up on stabilizers, all four must be fully deployed and on firm, level ground. Partially deployed stabilizers—or stabilizers on soft fill that sink under load—create an asymmetric support condition that is worse than being on tires because the machine can tip in an unexpected direction. We have seen machines go over because one stabilizer was on a manhole cover that shifted under load. Level, firm, fully deployed—no exceptions.

Wind loading: the invisible derating factor

Load charts are published for calm conditions. Wind creates a lateral force on the load and the boom that the chart does not account for. A 4-foot by 8-foot sheet of plywood at 40 feet of height in a 20 mph crosswind generates a significant lateral moment that reduces the machine's effective stability. Most OEMs recommend ceasing telehandler operations when sustained winds exceed 20–25 mph, but that guidance is often ignored on job sites with schedule pressure.

In Florida, afternoon thunderstorm buildups can bring sudden wind gusts that go from calm to 40+ mph in minutes. If your crew is working with a telehandler and sees buildups on the horizon, the time to boom down and stow is before the gust front arrives—not during it. We mention this in our buyer orientation for every telehandler sold through https://equipmentsupplyservice.combecause it is the kind of real-world risk that load charts alone do not communicate.

Used telehandler inspection priorities

When we intake a used telehandler for resale, the load chart and safety systems get as much attention as the engine and hydraulics. We verify that the LMI (Load Moment Indicator) is functional on machines so equipped, that the boom limit switches work, that the stabilizer interlocks function properly, and that the load chart placards are present and legible. A machine with a missing or defaced load chart placard is a liability we will not put on the lot without correction.

Boom condition is the big-ticket inspection item. We check for straightness (a bent boom section from an overload event is a structural compromise that cannot be ignored), pin wear in the extension sections, and hydraulic cylinder condition including rod scoring and seal leakage. A boom cylinder reseal on a JLG 943-class machine runs $1,500 to $3,000; a cylinder replacement can be $5,000 to $8,000. Boom section replacement for structural damage can exceed $15,000. These are the numbers that make a careful inspection worthwhile.

For used purchases, we verify fork ratings and carriage class, because a heavy block handler on the wrong carriage is a bad week waiting to happen. We mirror those details on https://equipmentsupplyservice.comwhen we know them; when we do not, we say "verify with serial-specific chart."

Our IRON+ telehandler process

Every telehandler that comes through our IRON+ inspection program gets a documented load chart verification, safety system function test, boom inspection, and stabilizer test in addition to the standard mechanical inspection. We photograph the load chart placard, record the LMI readings at multiple operating points, and note any discrepancies. This documentation travels with the machine to the buyer so you have a baseline for your own safety program.

If you are in the market for a used telehandler, check our current inventory at https://equipmentsupplyservice.com. We stock JLG, CAT, and JCB units in the 6,000 to 12,000 lb class, priced from $35,000 to $85,000 depending on hours, capacity, and condition. Every unit includes the spec documentation you need to evaluate it against your application requirements. Call us if you want to walk through a load chart for a specific unit—we would rather spend the time than have you learn the hard way.