Many Factors Keep Lifts Upright

Staff | September 28, 2010

This is the position of least backward stability for this boom. The machine could tip if operated on a slope with the counterweight downhill, if the upright is extended, or if a combination of other stability factors shifts the center of gravity back.

The combined affect of several stability-related issues — even if no single one of them is severe enough to upset a telehandler or aerial-work platform — can result in tipping the machine. For example, if one tire's pressure is low and it comes to a stop on uncompacted ground on the downhill side of a slightly sloping surface, the machine may well be stable enough that not even the operator notices.

But booming down over that low tire, an overloaded platform or forks, a strong gust of wind, and/or an abrupt control movement could send the machine over.

Don't use the tilt alarm as a level indicator. The tilt alarm, on machines so equipped, typically only sound when the machine is on a severe slope.

  • Always inspect the site for hazardous conditions and the machine for maintenance needs before operating.
  • Remember that booming down usually reduces stability.
  • Know your load, and never overload a boom or telehandler's rating.