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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.


Gross Power 174.0 HP 129.5 kW Less
Engine Model Cat® C6.6 ACERT™ Tier 4 Interim Cat® C6.6 ACERT™ Tier 4 Interim Less
Gross Power - 1,800 rpm 174.0 HP 129.5 kW Less


Operating Weight 34100.0 lb 15500.0 kg Less
Operating Weight - Less Grapple 34100.0 lb 15500.0 kg Less
Operating Weight - Without Grapple 34100.0 lb 15500.0 kg Less

Operating Specifications

Knuckleboom Length 32.0 ft 9.8 m Less
Swing Speed 11.0 r/min 11.0 r/min Less
Maximum Reach - Standard Boom 32.0 ft 9.8 m Less
Standard Knuckleboom Reach to Pin 32.0 ft 9.8 m Less
Swing Bearing - Diameter - Ball Path 43.5 in 1105.0 mm Less
Swing Torque 49173.0 ft-lb 66870.0 N·m Less
Tail Swing 106.0 in 2692.0 mm Less

Service Refill Capacities

Hydraulic Tank 80.0 gal (US) 302.0 l Less
Fuel Tank 100.0 gal (US) 378.0 l Less
Cooling System 7.5 gal (US) 29.0 l Less
Engine Oil 4.0 gal (US) 15.0 l Less
Swing Drive 1.0 gal (US) 4.0 l Less

Hydraulic System

Cylinders - Main two two Less
Cylinders - Stick one one Less
Hydraulic Pressure - Swing 3500.0 psi 24131.0 kPa Less
Hydraulic Pressure - System 3500.0 psi 24131.0 kPa Less
Cylinders - Stabilizers four four Less
Hydraulic Oil Flow at 1,800 rpm 230/174 L (60/46 gal) 230/174 L (60/46 gal) Less


Stabilizer Pad Size 508 × 711 mm (20 × 28 in) 508 × 711 mm (20 × 28 in) Less
Stabilizer Reach Below Grade 17.0 in 433.0 mm Less
Stabilizer Spread - Maximum Down Reach 166.8 in 4237.0 mm Less
Stabilizer Spread - Grade 187.3 in 4758.0 mm Less
Height - Top of Cab 157.6 in 4002.0 mm Less


OFPS cab meets SAE J2267 cab meets SAE J2267 Less

Shipping Dimensions - Mounted Trailer

Height 157.6 in 4002.0 mm Less
Width 101.3 in 2573.0 mm Less


Power Train

Operator Station


Structure and Subframe

Boom and Stick


Delimber/Slasher Package

Owning and Operating Costs


Customer Support


559C 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

  • 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

559C Optional Equipment

  • Non-suspension trailer with hydraulic landing gear
  • 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

Swear by Equipment Management

Fuel costs. Labor costs. Maintenance costs. They can all tax your patience. But with timely, accurate data, you can better manage your equipment to keep operating expenses in line. Cat® EMSolutions offers everything you need to control costs, help your guys work better, reduce risks and get more done every day.

See How