|
|
Test results on one inspection of 1,520 tractor and trailer combinations revealed that 46% hydrokraft of these vehicles had hydraulic brakes that were out of adjustment. The remaining OOS vehicles were cited for such defects as pump audible air leaks, cracked brake drums, loose hydrokraft brake components, brake linings not firmly attached to the shoe, brake lining less than one-quarter-inch thick, brake lining saturated with oil or grease, and damaged or frayed air line hoses or tubing.Interpreting brake termsBefore attempting to specify an air brake system for articulated vehicles, let''s define certain brake terminology so that the vehicle manufacturer, equipment dealer and truck fleet manager are all on the same frequency of communication:Balanced hydraulic Braking. This would occur on a tractor trailer combination when the brakes'' forces are divided evenly between the tractor and the trailer, or trailers. The trailer brakes would apply just before the tractor brakes and the tractor brakes would release just before the trailer brakes. In other words, every pump brake in the vehicle combination would be contributing to its designed share of the total braking effort. Also, balanced braking prevents trailer sluing (when the trailer wheels lock and go into an uncontrollable skid), as well as tractor jackknifing. Wildfire perimetersGPS is also a hydrokraft new asset for mapping the perimeters of hydraulic wildfires, pump but there are problems. Walking the fire hydrokraft line with a GPS unit hydraulic is too dangerous, and pump flying the perimeter in a helicopter equipped hydrokraft with GPS or mapping by hand from the air at a safe distance aren''t often feasible. During the initial stages of a hydraulic wildland fire, helicopters are pump usually busy with hydrokraft the more critical task of hydraulic dropping water.The Los Angeles County Fire Department has found a third alternative. pump and hydrokraft It has equipped bulldozers hydraulic with built-in GPS units, a scheme that''s proved to be valuable pump because it takes the guesswork out of where a bulldozer hydrokraft line exists. The GPS receivers hydraulic in these bulldozers pump have removable PC Type II cards that can be processed with associated mapping software. However, this bulldozer line typically makes up only a part of the fire line, hydrokraft the rest of which must hydraulic still be mapped by other means. Light towers can be roof mounted or recessed for a lower profile if necessary. Light towers will help light all hazards and call attention to overhead power lines, holes and unsound structures. They light major access/escape routes and ensure safer, more efficient movement. Make sure your generator is sized to simultaneously pump operate light tower and any other devices, and allow for at least 20% more than anticipated load.Warning light requirements for your light rescue will probably be the same as your pumper or aerial unless it''s hydrokraft under 25 feet in overall length. hydraulic This puts the truck into the "Small Apparatus" portion of NFPA 1901, which requires less lighting. While most pump would agree that more lighting is better, you could save some money and amperage in this area.
|