Free Load Chart Practice
NCCCO Load Chart Practice
The current CCO Mobile Crane Operator outline assigns about 27% of the Core exam and 35% of each specialty exam to load-chart domains. This page provides worked arithmetic practice; the exact manufacturer chart and its notes govern every real configuration.
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How to Read a Crane Load Chart
A crane load chart is a manufacturer-published table showing the maximum gross load a crane can handle at every combination of boom length, load radius, and operating configuration. Understanding each variable is essential before attempting NCCCO load chart problems.
Boom Length (feet)
Boom length is the distance along the boom structure from the boom foot pin to the boom tip. Load charts are organized by boom length — typically in 10- or 20-foot increments. Longer boom lengths generally reduce rated capacity at the same radius because the boom is heavier and less structurally efficient at extended lengths.
Load Radius (horizontal distance from center pin to load)
Load radius is the horizontal distance — measured on a level plane — from the crane's center of rotation (the slewing ring or center pin) to the centerline of the suspended load. This is NOT the boom length. A crane with a 100-foot boom raised to a steep angle may have only a 20-foot load radius. As radius increases, the lever arm grows and tipping moment increases dramatically.
Rated Capacity — What the Chart Shows
The value in each cell of the load chart is the rated capacity: the maximum gross load the crane may lift at that boom length and radius combination, under the specified conditions (outrigger configuration, on level ground, on firm surface). Use the chart's definitions and notes to determine which suspended weights are included and which must be deducted; do not substitute a universal percentage or generic chart rule.
As Radius Increases — Capacity Decreases Dramatically
The relationship between radius and capacity is non-linear. Moving a load from 25-foot radius to 40-foot radius might cut rated capacity nearly in half. This is the most critical concept for NCCCO exam problems: a lift that is safe at a 25-foot radius can easily exceed rated capacity if the load swings outward even slightly. Always re-check the chart whenever radius changes.
Deductions: Hook Block, Headache Ball, Slings, Shackles
Rated capacity is a gross limit. To find how heavy your actual load can be, you must subtract the weight of all rigging equipment hanging below the hook:
- Hook block (also called overhaul ball assembly) — typically 300–1,500 lbs
- Headache ball — if used instead of a full block
- Wire rope slings, chain slings, or synthetic slings
- Shackles, hooks, swivels, and other hardware
- Spreader bars or lifting beams (if not part of the load itself)
Net Capacity Formula
Net Capacity = Rated Capacity − Total Rigging Deductions
Net capacity is the maximum weight of the actual load you can lift. Never report rated capacity as your answer when the exam asks for maximum load weight — you must always subtract deductions first.
What OSHA's 75% Provision Means
OSHA 29 CFR 1926.1417(o)(3) requires the load to be verified within rated capacity. If an operator begins hoisting to determine weight and an indicator shows more than 75% of maximum rated capacity at the longest radius, work cannot proceed until the load weight is verified by a recognized source or calculation. That rule is not a universal definition of a critical lift and does not replace stricter manufacturer, employer, site, or other applicable requirements.
Sample NCCCO Load Chart Practice Problems
Work through these three problems the same way you will on the NCCCO exam: identify the configuration, look up rated capacity, calculate deductions, and solve for net capacity. All chart values are illustrative inputs, not field load-chart data.
Problem 1
Basic Net Capacity Calculation
A 120-ton mobile crane is set up on fully extended outriggers with a 100-foot boom. The load radius is 30 feet. The rated capacity at this configuration is 42,000 lbs. The rigging consists of a hook block weighing 650 lbs and two wire rope slings weighing 200 lbs total. What is the maximum net load you can lift?
Step-by-Step Solution
- 1.Identify rated capacity from the load chart: 42,000 lbs
- 2.Calculate total rigging deductions: hook block (650 lbs) + slings (200 lbs) = 850 lbs
- 3.Apply the deduction formula: Net Capacity = Rated Capacity − Deductions
- 4.Net Capacity = 42,000 − 850 = 41,150 lbs
Maximum net load = 41,150 lbs
Exam note: The rated capacity is the gross capacity — it includes the hook block, rigging, and load. You must subtract all rigging hardware to find the maximum weight of the actual load.
Problem 2
Radius Change — Capacity Drop
A telescopic boom crane is configured with a 120-foot boom. At 25-foot radius, the rated capacity is 58,000 lbs. The operator needs to swing the load to a position that increases the radius to 40 feet. At 40-foot radius, the rated capacity drops to 31,000 lbs. The hook block weighs 800 lbs and the slings and shackles weigh 420 lbs. The load weighs 29,500 lbs. Can this lift be made at 40-foot radius?
Step-by-Step Solution
- 1.Calculate net capacity at 40-foot radius: 31,000 − (800 + 420) = 31,000 − 1,220 = 29,780 lbs
- 2.Compare net capacity to load weight: 29,780 lbs net capacity vs. 29,500 lbs load
- 3.Load (29,500 lbs) is less than net capacity (29,780 lbs) — the lift is within rated capacity
- 4.Calculate load-to-capacity ratio: 29,500 ÷ 29,780 = 99.1% — this is extremely close to 100%
In this arithmetic example, the load is 280 lbs below the entered net capacity.
Exam note: This result is arithmetic practice, not lift approval. OSHA's 75% provision in 29 CFR 1926.1417(o)(3) is a load-weight verification trigger when the operator begins hoisting to determine weight; it is not a universal critical-lift-plan rule. Real work must follow the exact manufacturer chart, procedures, and applicable employer or site plan.
Problem 3
Outrigger Configuration — On Rubber vs. Full Extension
A worked example provides a 50%-outrigger table value of 22,000 lbs at a 35-foot radius with a 90-foot boom. A separate full-extension table shows 38,500 lbs for the same radius and boom length. The stated rigging weight is 1,100 lbs and the load is 20,000 lbs. Using only the stated 50%-outrigger table value, is the load within the example net capacity?
Step-by-Step Solution
- 1.Identify the correct table: 50% outrigger extension table applies — NOT the full extension table
- 2.Rated capacity at 50% extension, 90-ft boom, 35-ft radius: 22,000 lbs
- 3.Calculate net capacity: 22,000 − 1,100 = 20,900 lbs
- 4.Compare: load (20,000 lbs) vs. net capacity (20,900 lbs)
- 5.Load-to-capacity ratio: 20,000 ÷ 20,900 = 95.7% — extremely close to rated limit
The example net capacity is 20,900 lbs, so the stated load is 900 lbs below it.
Exam note: The full-extension value does not apply to the stated 50%-outrigger setup. For real work, use the exact manufacturer chart and notes for the machine and configuration; this worked example does not determine whether a lift is safe or permitted.
Try It Yourself — Crane Load Ratio Calculator
Enter a rated capacity, load weight, rigging weight, and deductions to see net capacity and the load-to-capacity ratio instantly — the exact math the NCCCO exam tests. Free, no signup.
Crane Load Ratio Calculator
From the exact chart for this crane, configuration, and radius
All below-the-hook gear not already included in load weight
Other deductions required by the selected chart; do not double-count rigging
Entered Capacity Utilization
38.8%
Within the entered net chart capacity — not a lift approval.
Total Load
15,500 lbs
Net Capacity
40,000 lbs
Entered Capacity Remaining
24,500 lbs
Calculation boundary
Gross load = object weight + below-the-hook rigging weight
Entered net capacity = chart capacity − other chart-required deductions
Utilization = gross load ÷ entered net capacity × 100
No universal 75%, 85%, or 90% safe zone is applied.
For exam practice and estimation only — not a substitute for engineered design, manufacturer data, current codes, or a licensed professional's judgment. Verify all values before relying on them.
Common Load Chart Mistakes on the NCCCO Exam
These are five chart-reading errors worth checking during practice. The current CCO source does not publish a failure-cause ranking.
Forgetting rigging deductions entirely
Do not assume that a displayed capacity is the allowable object weight. Read the exact chart definitions and notes, identify the suspended weights the scenario supplies, and apply only the deductions that chart requires to determine net capacity.
Confusing load radius with boom length
Boom length and load radius are different values on the load chart. Load radius is the horizontal distance from the center pin to the load — not the length of the boom. A 100-foot boom at a steep angle may produce a 20-foot radius. Always measure radius horizontally.
Reading the wrong outrigger configuration table
A manufacturer chart may separate full extension, partial extension, on-rubber, or other configurations. Use only the table and notes that match the problem's stated machine and setup; never borrow a value from a different configuration.
Ignoring the 'On/Off' or 360° vs. restricted swing notation
Some load charts show different capacities depending on swing zone — for example, over the front vs. over the side. Lattice boom crawler cranes typically have separate front and side capacity tables. Using the higher front-of-machine value when lifting over the side can exceed actual tipping capacity.
Not accounting for jib or fly section deductions
Attachments can change capacity and required deductions. Check the exact manufacturer's load-chart notes for the installed jib, fly section, rope, hook block, and other equipment instead of assuming one treatment applies to every chart.
NCCCO Load Chart Exam — Frequently Asked Questions
How many load chart questions are on the NCCCO exam?Show
The current CCO Mobile Crane Operator Candidate Handbook lists Load Charts as approximately 27% of the 95-question Core exam and Manufacturers' Load Charts as approximately 35% of each 28-question specialty exam. Those are outline percentages, not a promise of an exact item count on a particular test form.
What deductions must I subtract from rated capacity on the NCCCO exam?Show
Use the exact manufacturer load chart, notes, and problem facts. The current CCO outline expects candidates to determine gross and net capacity, while OSHA requires the operator to verify load and rigging weight before a lift. Include each deduction the governing chart and scenario require; do not apply one memorized list to every crane configuration.
What does 'load radius' mean on a crane load chart?Show
Load radius (also called operating radius or working radius) is the horizontal distance from the crane's center of rotation (the center pin or slewing ring) to the center of the suspended load. It is NOT the boom length. As radius increases, the crane's rated capacity decreases dramatically because the longer moment arm places greater tipping stress on the machine. On load charts, you cross-reference boom length (vertical axis or columns) with load radius (horizontal axis or rows) to find the rated capacity for your specific configuration. Always measure radius horizontally, not along the boom angle.
Do outriggers affect load chart capacity on the NCCCO exam?Show
Yes. The current CCO specialty outline requires candidates to apply manufacturer load charts across configurations, including on rubber, on outriggers, or on crawlers where applicable. Use only the table and notes that match the stated machine and setup; this page does not supply a field load chart or authorize a lift.
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1,000+ NCCCO crane practice questions — load charts, rigging math, OSHA 1926, hand signals, and crane safety. Includes a load-to-capacity ratio calculator with step-by-step deduction walkthroughs.
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