Note · 1 September 2026
Reading a load chart
A document that states load limits, and four mistakes that defeat those limits.
A telehandler load chart is a document that specifies how equipment limits change with load position: rather than offering a single flattering capacity figure, it admits that capability collapses as the load moves away from the machine and publishes exactly how. That candour is why the four habits that defeat its stated limits are worth naming: reading the headline instead of the chart position, using the chart for the wrong attachment, treating frame levelling as though it added capacity, and assuming ground conditions match what the chart assumed. None of them requires bad faith.
All four are failures of reading, and all four produce a number the machine cannot honour at the position being attempted.
A telehandler load chart is a document that specifies how equipment limits change with load position. Rather than offering a single flattering capacity figure, it admits that the machine's capability collapses as the load moves away from it, and it publishes exactly how. That candour is unusual, and it is precisely why the habits that defeat the chart's stated limits are worth naming individually.
Four mistakes that defeat a load chart's stated limits
Each of these is common, and none requires anybody to act in bad faith. They are failures of reading rather than of intent.
Reading the headline instead of the position
The largest number on a chart applies at the least demanding position: boom retracted, load low, close to the machine. Quoting that number as "the machine's capacity" is technically true and operationally meaningless, because almost no real lift happens there. The number that governs is the one at the height and reach the proposed lift requires at its working position.
Using the chart for the wrong attachment
Each attachment has its own chart, because each changes the load's weight and centre of gravity. Plain forks, a carriage with side shift, a truss boom and a bucket are four different charts on the same machine. Reading one for another produces a number the machine cannot honour at the position being attempted, and the error is invisible until the machine tells you.
Treating frame levelling as capacity
Frame levelling tilts the machine so the boom is plumb on sloping ground, which keeps the geometry as the chart assumed. It does not widen the support base and it adds nothing to capacity. Using it to compensate for a load that is too heavy is a misunderstanding with an obvious failure mode.
Stabilisers, where fitted, change the machine's support geometry, and machines with them publish a separate chart.
Assuming the ground matches the chart
A chart assumes a firm, level surface. Soft ground under one side, a slope, or a machine that settles during a lift all move the machine out of the condition the chart describes. The chart cannot warn you about this and it does not try to; it is a document about the machine, and the surface is the operator's problem.
| Where you meet it | How it is presented | What it is underneath |
|---|---|---|
| Telehandler | A two-dimensional chart of height against reach | A moment limit: load multiplied by distance from the tipping line |
| Pallet forks | A capacity quoted at a stated load centre | The same moment limit, expressed as one weight at one distance |
| Tractor loader | Capacity quoted at the pins and 500 mm forward of them | The same moment, sampled at two positions instead of charted |
| Wheel loader | Static tipping load at full articulation | The same moment, at the machine’s least favourable geometry |
The underlying physics, in one sentence
Tipping moment is the load multiplied by its distance from the tipping line, so a telehandler chart is really a moment limit shown as a two-dimensional diagram. That is the same quantity governing a Pallet forks: fork rating at a load centre, a loader tipping forward and a wheel loader's full-turn tipping load. Four documents, four presentations, one physical fact.
Recognising that they are the same calculation is what makes the chart intuitive rather than a lookup table. Once the mechanism is clear, the chart's shape is predictable: it has to fall away as reach increases, because the moment arm is growing, and it has to be specific to the attachment because the attachment sets where the carried load sits relative to the machine.
What the chart is not
It is not a permission slip, and it is not a target. It describes where the machine reaches its stability limit under the conditions assumed, which means operating at the chart value is operating at a limit rather than within one. The margin between the chart value and the actual tipping point exists to absorb the things the chart cannot know: ground that is not quite level, a load that is not quite where it was measured, a gust, a movement that is not quite smooth.
Treating the chart as an accurate description of a boundary rather than a recommended working point is the reading that keeps machines upright. The document is telling you where the edge is; it is not suggesting that you stand on it.
Straight answers
Reading a load chart: Questions and answers
Why does a telehandler have a chart instead of a capacity figure?
Because its capacity changes with the working geometry with the position of the load. Tipping moment is the load multiplied by its distance from the tipping line, so extending or raising the boom reduces what can safely be carried. A single headline figure would describe only the most favourable position, boom retracted and low, and would be misleading at every other point, which is exactly what the chart exists to prevent.
Does frame levelling let a telehandler lift more?
No. Frame levelling tilts the machine body relative to its axles so the boom is plumb on sloping ground, keeping the geometry as the chart assumed. It does not widen the support base and adds no capacity. Stabilisers, where fitted, do change the geometry by extending the support base forward, and machines with them publish a separate and higher chart for use with them deployed.
Is it safe to work at the chart value?
The chart describes where the machine reaches its stability limit under the conditions assumed, so working at the chart value is working at a limit rather than within one. The margin between the chart value and the actual tipping point absorbs what the chart cannot know: ground that is not quite level, a load not quite where it was measured, a movement that is not quite smooth. The chart says where the edge is; it does not suggest standing on it.
Do I need a different chart for each attachment?
Yes, and reading the wrong one is among the most common serious errors on site. Each attachment changes the load's weight and its centre of gravity, so plain forks, a carriage with side shift, a truss boom and a bucket are four different charts on the same machine. The resulting error is invisible until the machine demonstrates it.
Why does this note say a load chart is "unusually honest" compared with other equipment specifications?
Because most specifications reduce a machine's capability to a single flattering headline number, while a load chart openly publishes every position where capability is lower, including the least favourable ones. It is the same underlying moment limit other specifications hide behind one convenient measurement point, made fully visible instead.
Does wind affect how much margin I should leave below a load chart's stated capacity?
Wind is one of the real-world factors the chart's stated margin exists to absorb, per this note's own point about the chart describing a limit rather than a safe working recommendation: a gusty day is exactly the situation where staying meaningfully under the chart value, not at it, is the sound practice.
Is the tipping line the same as the edge of the machine's tires or tracks?
Approximately, though the precise tipping line depends on the specific machine's geometry and is defined by the manufacturer's own testing rather than simply the visible edge of the tires or tracks: the chart's figures already account for the actual tipping line, so a user does not need to separately estimate it.
Can a load chart become outdated if the machine is modified after purchase (added counterweight, different tires)?
Yes: a chart is only valid for the machine configuration it was calculated for, so a genuine modification affecting weight distribution or stability (added counterweight, a different tire or track type) can invalidate the published chart, and the manufacturer or a qualified engineer should be consulted before relying on the original chart for a modified machine.
Do all telehandlers use the same shape of load chart, or does it vary by manufacturer?
The underlying physics (height against reach, falling capacity with distance) is universal, but the specific chart layout, units and presentation format vary by manufacturer, so a chart from one brand cannot be read against a different brand's machine: always use the chart published for the specific model and attachment in hand.
Why does a bucket attachment typically have a simpler capacity relationship than a fork or boom attachment?
Because a bucket's load sits in a relatively fixed position close to the attachment rather than at a variable, operator-controlled distance the way forks or a jib can be positioned, so its chart or rating tends to need fewer variables to describe fully compared with attachments where load position varies more.
Is a load chart ever presented as a table of numbers instead of a two-dimensional graphic?
Yes: some manufacturers present the same height-against-reach capacity relationship as a table of figures at discrete height and reach increments rather than a continuous chart, which is the same underlying moment limit in a different format and is read the same way: find your actual height and reach, not the most favourable ones.
Who is responsible for confirming an operator understands how to read a load chart correctly?
Ultimately the employer or the machine's owner, as part of the operator-training obligations covered on the operator training page: a load chart only informs the lift when the person using it understands the stated configuration and load position, which is exactly the skill formal training programmes are built to cover.