Study Use Only
This is an annotated study version for exam preparation. Never use it to plan a real lift — always use the manufacturer's load chart and operator's manual supplied with the specific crane, matched to its serial number and configuration.
Full TSS/TLL exam prep course →The Parts of This Load Chart
The labels A1–A9 match the annotations in the study chart. Learn what each one controls before you answer a single question.
A1 — Lifting notes
The operating requirements and safety rules that make the chart valid. Read every note first; they define the conditions the rated capacities assume.
A2 — Load radius
The horizontal distance from the center of rotation to the center of the load, shown in the left column. As radius goes up, capacity comes down.
A3 — Boom lengths
The top row. Longer booms reach farther but generally carry less at the same radius.
A4 — Rated capacities
The figures in the body of the table: the maximum allowable load, in pounds, for that radius and boom length. A blank (—) means the combination isn't possible.
A5 — Deductions
Weights of lifting equipment such as hook blocks, headache balls and slings that must be subtracted from rated capacity to find what you can actually pick.
A6 — Load hoist rope
Wire rope specifications, used to work out how many parts of line a load requires.
A8 — Outrigger configuration
Charts may give separate capacities for fully extended outriggers, intermediate positions or on rubber. Always use the column that matches the actual setup.
A9 — Work area
Some charts list capacities for 360° rotation separately from over-front or over-side. The 360° figures are the most restrictive and apply in every direction.
A1 Lifting Notes and Operating Requirements
If any of these conditions isn't met — outriggers not fully extended, for example — the chart capacities don't apply. That's a favorite exam trap.
All rated loads have been tested to and meet minimum requirements of SAE J1063.
Capacities shown do not exceed 85% of the tipping load.
The weight of the hook block, slings, and all other load handling devices must be considered part of the load.
Outrigger beams must be fully extended and jacks set on a firm supporting surface.
Crane must be level.
Grove TMS750B Capacity Chart
Find the radius in the left column (A2), the boom length across the top (A3), and read the rated capacity where they meet (A4).
| Load radius (ft) | 29 ft | 38 ft | 50 ft | 62 ft | 74 ft | 86 ft | 95 ft |
|---|---|---|---|---|---|---|---|
| 10 | 60,000 | — | — | — | — | — | — |
| 12 | 49,600 | 49,600 | — | — | — | — | — |
| 15 | 36,000 | 36,000 | 36,000 | — | — | — | — |
| 20 | 22,800 | 23,400 | 23,400 | 23,400 | — | — | — |
| 25 | 15,800 | 16,600 | 17,200 | 17,200 | 17,200 | — | — |
| 30 | — | 12,200 | 13,000 | 13,400 | 13,400 | 13,400 | — |
| 35 | — | 9,600 | 10,400 | 11,000 | 11,200 | 11,200 | 11,200 |
| 40 | — | — | 8,400 | 9,200 | 9,600 | 9,600 | 9,600 |
| 50 | — | — | 5,400 | 6,400 | 6,800 | 7,200 | 7,200 |
| 60 | — | — | — | 4,400 | 4,800 | 5,200 | 5,400 |
| 70 | — | — | — | 2,800 | 3,400 | 3,800 | 4,000 |
| 80 | — | — | — | — | 2,200 | 2,600 | 2,800 |
| 90 | — | — | — | — | — | 1,800 | 2,000 |
| 95 | — | — | — | — | — | — | 1,600 |
A5 Deductions for Lifting Devices
Subtract every item that applies from the rated capacity. A stowed jib counts even if you aren't using it.
| Item | Weight to deduct |
|---|---|
| Headache Ball | 195 lbs |
| Hook Block | 510 lbs |
| Jib Stowed | 1,100 lbs |
| Jib Erected | 2,200 lbs |
Reading the Chart: Five Steps and a Worked Example
Find the radius
Locate your load radius in the left column (A2). If your exact radius isn't listed, standard practice is to use the next longer radius shown — the more conservative figure.
Find the boom length
Locate your boom length in the top row (A3).
Read the rated capacity
Where the row and column meet is the rated capacity (A4). Example: 40 ft radius with 62 ft of boom gives 9,200 lbs.
Subtract the deductions
Take off everything in the load path and anything stowed on the boom (A5). Example: 9,200 − 510 (hook block) − 1,100 (jib stowed) = 7,590 lbs.
Compare to the load
The result is your net capacity. The load, including slings and any other rigging not already deducted, must not exceed it.
A6 Load Hoist Rope
This chart specifies 5/8" 6x19 IWRC hoist rope (IWRC means independent wire rope core) with a breaking strength of 41,200 lbs. On the exam, know the rope's diameter, type and breaking strength, because together with the number of parts of line they determine how much each line can carry.
The allowable load on a single part of line equals the breaking strength divided by the required safety factor. Reeving more parts of line multiplies hoisting capacity — four parts can handle roughly four times the single-part figure — but the crane can never lift more than the chart's rated capacity allows.
Want more chart practice? Try the sample questions on our CCO practice test page, or build the full skill set in our mobile crane certification prep.