Attaching weights to the front of the machine can help with the performance of certain attachments. "As long as the counter balance is within the recommendation limits of the manufacturer, you can generally put as much weight on the front of the machine as needed because the limiting factors will be the hydraulic system breakout forces and the tipping load of the machine," says Zupancic. "Constant heavier loads will accelerate wear over the life of the machine. For example, constantly lifting 4,000 lbs. vs. lifting 100 lbs. will increase wear on the pivot points of the boom linkage over time."

Wheelbase further impacts capacity

The wheelbase also affects the rated operating capacity. "For example, Bobcat has three wheelbase options to choose from," says Fitzgerald. "The small-frame loaders' wheelbase is approximately 36 in.; the medium-frame loaders are 40 in.; while the large-frame loaders are 48 in. The large-frame skid-steer loaders' wheelbase allows for higher tipping loads and rated operating capacities."

In addition, the extended wheelbases enhance stability. "By extending the wheelbase on New Holland skid steers, we can better distribute the weight over a desired footprint and use the laws of physics to our advantage," says DeHoyos. This allows the skid steers to lift more with less vehicle weight. "The wider wheelbase gives the additional benefit of stability and gives the skid-steer operator more confidence."

Of course, there is more to rated operating capacity than the stance of the machine. "Extended wheelbases contribute to additional lift capacity, but there are other factors that also contribute," says Zupancic. "For example, total machine weight and the geometry of the boom design can also contribute to increased lifting capacities."

Check compatibility

Not all skid-steer attachments are compatible with every make of skid steer. One example is the recent introduction of undercarriage kits that convert skid steers to compact track loaders. Before installing a tracked undercarriage conversion kit, be sure to check whether the manufacturer of your particular skid steer approves their use so not to void the machine warranty.