13.07.2015 Views

View Full August PDF Issue - Utility Contractor Online

View Full August PDF Issue - Utility Contractor Online

View Full August PDF Issue - Utility Contractor Online

SHOW MORE
SHOW LESS
  • No tags were found...

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

steers, but provide extra traction and stability, a smootherride, more pushing power and a lighter footprint. Theirdisadvantages include a higher purchasing price, higheroperating costs and the inability to roll over hard surfaceslike concrete and asphalt without major wear.The other variation takes the versatility and maneuverabilityto a new level. Referred to as a mini skid steer orcompact utility loader, the miniaturized versions of theconstruction site standby works are also becoming popular— especially for rental uses.The little loaders are fitted with tracks or wheels andequipped with little arms that could run a variety of differenthydraulic work tools (buckets, breakers, augers,trenchers, pallet forks and any other implement).Designed to work in very cramped residential or constructionworksites where only wheelbarrows could fitbefore, the loaders can adapt to almost any work application— boring holes, loading material, trenching and simplycutting down on manual labor that’s usually donewhere a machine won’t fit.<strong>Full</strong>y LoadedTraditional skid steers still come in a variety of sizes,but there are also a few fundamental differences in skidsteers that potential buyers (and even renters) need toknow about. For example, skid steer loaders can eitheruse lift-arms with radial lift or vertical lift designs. Radiallift arms are connected to the machine with a single pinon each side, which allow the bucket to follow an arc asit rises.“On a radial lift, the bucket sits close to the machinewhen it is in the down position to make the machinemore stable and compact whenmoving loads around,” says GreggZupancic, product marketingmanager for skid steers and compacttrack loaders at John DeereConstruction & Forestry. “As thebucket is raised, it moves awayfrom the machine and thenstraight up. This gives themachine extra reach, making iteasier to dump a load into themiddle of a pickup or place a palletinto a deep shelf.”According to manufacturers,radial lift machines are typicallybest-suited for digging in hardsoil and are more conducive torough and abusive conditions. Onthe other hand, vertical liftmachines are better suited forhandling, loading and palletwork. While both types can beutilized for any application, lifecycle and productivity determinewhich unit is a better match forthe job and the contractor.Variation in operator controls is another important factorto consider. Most skid steers are controlled by eithersingle- or two-lever steering. The single lever system isbest suited for pilot control systems and allows the operatorto “split” the control of the machine into their rightand left hands. All travel is accomplished by the left leverwhile the right lever controls the lift and tilt. With twoleversteering, the left travel and lift is accomplished bythe left lever and right travel and bucket are controlled bythe right lever.“Komatsu uses pilot-proportional controls as standardon its models and offers a pattern change valve as anoption that allows the operator to choose between singleand two lever steering,” says Beesely. “Pilot controlsappear to be the latest change to sweep the market. Whilesome have had pilot controls from the beginning, all othersare now introducing or planning introduction of thissystem. They allow very fine control with little operatoreffort. All in all, control systems are mainly based onoperator preference and operators simply prefer controlswith which they are familiar.”In the last few years, joystick controls have been integratedinto the operator controls, providing more intuitiveoperation. Caterpillar used joystick controls in itsfirst loaders back in 1999, and other manufacturers havetaken similar approaches. Bobcat currently offers threetypes of operator controls, including traditional (footpedals and steering levers), advanced controls(advanced hand and foot controls) and selectable joystickcontrols (ISO-pattern or H-pattern controls). Theyare also designed with what is referred to as Bobcat’s“selectable joystick controls” or the SJC System, whichThe skid steer market has expanded on its original theme, with many manufacturersadding dedicated track machines called compact track loaders. They are built to thesame specifications as skid steers, but provide extra traction, stability and pushing power.<strong>August</strong> 2007 | <strong>Utility</strong> <strong>Contractor</strong> 19

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!