336 Excavator

  • Specs Summary

579C Knuckleboom Loader

Cat knuckleboom loaders are known for superior multifunction capability, excellent visibility and heavy-duty booms and structures. Now the Cat C Series knuckleboom loaders feature a new more fuel efficient power system, an upgraded hydraulic system for greater reliability and significantly more lift at full reach than previous models. Like the smaller model, the Cat 579C, now has a right-side operator's cab with a walk-up platform and enlarged doorway for safe access to the cab.

Standard Equipment


  • 24V system
  • Master disconnect
  • Circuit breaker protection
  • 95 Amp alternator
  • Two (2) 12V maintenance free batteries
  • Standard lighting package: - Two (2) cab mounted halogen light fixtures
  • Electronic engine/machine monitoring system
  • Two (2) 12V power points
  • 20 circuit electric swivel


  • Cab with swing out front window guard (meets SAE J2267)
  • Isolation mountings
  • Dual joystick control (pilot hydraulic actuation) with foot pedal swing
  • Electric stabilizer controls
  • Integrated trailer landing gear control
  • Pilot shut-off button
  • Push button throttle control
  • Reverse slope windshield
  • Skylight
  • Tinted safety glass
  • Sunshade - dual position for front window/skylight
  • High back suspension seat with lumbar support
  • High capacity AC/heater system with outside air intake
  • Defroster fan
  • Windshield wiper/washer
  • Dome light
  • Horn
  • Radio ready - includes speakers and AM/FM antennas
  • CB Radio ready - includes mounting bracket, power and ground wires, antenna cable and antenna mount bracket
  • Product Link ready
  • Cup holder
  • Fire extinguisher mounting bracket
  • Diagnostic port
  • Cell phone storage tray


  • Cat C6.6 ACERT engine meets U.S. EPA Tier 4 Interim/EU Stage IIIB emission standards
  • Electric fuel priming pump
  • Air precleaner
  • 2-stage air cleaner
  • Enlarged cooling package with isolated cores
  • 378 L (100 U.S. gal) fuel tank
  • Fuel water separator
  • Variable speed fan


  • Twin 140 cm3 (8.54 in3) variable displacement pumps
  • Excavator style “Negacon” system
  • Bar slasher/delimber hydraulic package
  • 302 L (80 U.S. gal) hydraulic tank
  • Electric hydraulic oil fill pump


  • 653 kg (1,440 lb) counterweight
  • Fabricated heavy-duty, extended length center mount subframe
  • Flat top subframe deck with bolt-on skid resistant fenders
  • Bolt-on subframe ladder


  • 9.8 m (32 ft) reach knuckleboom
  • 229 mm (9 in) grapple mounting knuckle


  • 50% concentration extended life coolant

Optional Equipment


  • Suspension trailer with hydraulic landing gear
  • CTR 320 three-knife delimber
  • CTR 426 four-knife delimber


  • Cat Product Link
  • AM/FM/CD/Satellite radio receiver
  • Long-range front lights on cab
  • Engine compartment lights
  • Additional subframe ladders
  • Auxiliary light package
  • Slasher port adapter fittings
  • Single “V” and double “VV” bolt on heels
  • Single “V” extended and double “VV” extended bolt on heels
  • 305 mm (12 in) grapple mounting knuckle
  • Grapples