Every skid-steer spec sheet lists two numbers that sound alike: tipping load and rated operating capacity. Mixing them up is one of the fastest ways to put a machine on its nose. Here’s what each one means and how to use them on the job.
Tipping load: the point of failure
Tipping load is the weight in the bucket that lifts the rear wheels or tracks off level ground. It’s measured under ideal test conditions: firm, level surface, standard machine, load in a set position. It is not a working limit. At the tipping load, you’ve already lost control of the machine.
Rated operating capacity: the working limit
Rated operating capacity (ROC) is the load you can handle safely under normal working conditions. Manufacturers rate compact loaders using an international (ISO) method that builds in a safety margin:
- Wheeled skid-steers: ROC is no more than 50% of the tipping load.
- Compact track loaders: ROC is no more than 35% of the tipping load.
Track loaders get a smaller percentage because tracks behave differently over uneven ground and can drop suddenly over curbs, bumps or the end of a ramp.
A quick example
Say a wheeled skid-steer’s spec sheet lists a tipping load of 2,000 kg. Its ROC is 1,000 kg. A track loader with a 3,000 kg tipping load has an ROC of 1,050 kg. (These are example numbers. Always use the figures for your machine, found in the operator’s manual, on the spec sheet and on a decal.)
The gap between ROC and tipping load is your safety margin. Every time you carry more than the ROC, you’re spending that margin, and a pothole, a sharp turn or a slope can spend the rest.
What lowers your real capacity
- Pallet forks and long attachments. They carry the load further from the machine, so the ROC with forks is lower than with a bucket. Check the capacity decal on the fork frame.
- The wrong tire pressure. Over- or under-inflated tires change how the machine sits and reduce stability.
- Dense material in a big bucket. Wet clay, gravel or snow-melt slush in an oversized bucket can easily put you over capacity. Match the bucket to the material.
- Unapproved counterweights or attachments. They change the rating in ways you can’t see. Use only what the manufacturer approves for your machine.
- Slopes, ruts and soft ground. The rating assumes firm, level ground. Anything else eats into your margin.
Carry it low
Capacity is only half the story. A load at the ROC is stable when it’s carried low. Raise it high, turn quickly or drive across a slope and the same load can tip you. Keep the bucket low when you travel, and only raise it when the machine is stopped where you mean to dump.
Try it yourself
Our Skid-Steer Loader Safety course includes an interactive calculator where operators set the tipping load and the load in the bucket and see when they cross the line. You can try the first lesson free, no sign-up needed.