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579D Knuckleboom Loader

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SPECIFICATION SUMMARY
  • Gross Power 173 hp
  • Knuckleboom Length 32 ft
  • Operating Weight 36500 lb
  • Engine Model Cat C4.4 ACERT

PRICE (USD)
Call 800-637-5000 for rate information

Engine

  • Gross Power
    173 hp
  • Engine Model
    Cat C4.4 ACERT
  • Gross Power at 1,800 rpm
    173 hp
  • Gross Power
    173 HP
  • Engine Model
    Cat C4.4 ACERT
  • Gross Power - 1,800 rpm
    173 HP

Operating Specifications

  • Knuckleboom Length
    32 ft
  • Swing Speed
    9.5 rpm
  • Note
    *Theoretical
  • Maximum Reach - Standard Boom
    32 ft
  • Swing Bearing - Diameter - Ball Path
    43.5 in
  • Swing Torque*
    73800 ft·lbf
  • Tail Swing
    108.2 in
  • Knuckleboom Length
    32 ft
  • Swing Speed
    9.5 r/min
  • Note
    *Theoretical

Weights

  • Operating Weight
    36500 lb
  • Counterweight
    1440 lb
  • Operating Weight without Grapple
    36500 lb
  • Operating Weight
    36500 lb
  • Counterweight
    1440 lb
  • Operating Weight - Without Grapple
    36500 lb

Hydraulic System

  • Cylinders – Main
    one
  • Cylinders – Stick
    one
  • Hydraulic Pressure – System
    3625 psi
  • Hydraulic Pressure – Swing
    3625 psi
  • Cylinders - Stabilizers
    four
  • Hydraulic Oil Flow at 1,800 rpm
    230/230 L/min (60/60 gal/min)
  • Cylinders - Main
    one
  • Cylinders - Stick
    one
  • Hydraulic Pressure - Swing
    3625 psi
  • Hydraulic Pressure - System
    3625 psi

Service Refill Capacities

  • Hydraulic Tank
    80 gal
  • Fuel Tank
    100 gal
  • Engine Oil
    2.1 gal
  • Cooling System
    7.5 gal
  • Swing Drive
    2.6 gal
  • DEF Tank
    5 gal
  • Hydraulic Tank
    80 gal (US)
  • Fuel Tank
    100 gal (US)
  • Cooling System
    7.5 gal (US)
  • Engine Oil
    2.1 gal (US)
  • Swing Drive
    2.6 gal (US)
  • DEF Tank
    5 gal (US)

Dimensions

  • Height to Top of Cab
    159.1 in
  • Stabilizer Pad Size
    508 × 711 mm (20 × 28 in)
  • Stabilizer Reach Below Grade
    15.5 in
  • Stabilizer Spread - Maximum Down Reach
    166.8 in
  • Stabilizer Spread - Grade
    183.8 in
  • Note
    579D dimensions are on suspension trailer.
  • Height - Top of Cab
    159.1 in
  • Note
    579D dimensions are on suspension trailer.

Standards

  • OFPS
    OFPS cab meets SAE J2267

Shipping Dimensions - Mounted Trailer

  • Width
    101.3 in
  • Height
    159.1 in

GLK Series Grapples – GLK55

  • Height (open/excluding rotation)
    46.7 in
  • Height (open/including rotation)
    68 in
  • Weight (excluding rotation)
    1411 lb
  • Weight (including rotation)
    1911 lb
  • Area (tip to tip)
    3.8 ft2
  • Open
    54 in
  • Close
    5 in
  • Note
    All specifications are approximate.

GLK Series Grapples – GLK48

  • Height (open/excluding rotation)
    45.1 in
  • Height (open/including rotation)
    66 in
  • Weight (excluding rotation)
    1407 lb
  • Weight (including rotation)
    1907 lb
  • Area (tip to tip)
    3.0 ft2
  • Open
    48 in
  • Close
    4.5 in
  • Note
    All specifications are approximate.

GLK Series Grapples - GLK48

  • Area (tip to tip)
    3 ft²
  • Close
    4.5 in
  • Height - Open - Excluding Rotation
    45.1 in
  • Height - Open - Including Rotation
    66 in
  • Note
    All specifications are approximate.
  • Open
    48 in
  • Weight - Excluding Rotation
    1407 lb
  • Weight - Including Rotation
    1907 lb

GLK Series Grapples - GLK55

  • Area (tip to tip)
    3.8 ft²
  • Close
    5 in
  • Height - Open - Excluding Rotation
    46.7 in
  • Height - Open - Including Rotation
    68 in
  • Note
    All specifications are approximate.
  • Open
    54 in
  • Weight - Excluding Rotation
    1411 lb
  • Weight - Including Rotation
    1911 lb

Performance

  • The Cat® C4.4 ACERT™ U.S. EPA Tier 4 Final engine provides equivalent power (129.3 kW/173 hp) and optimized performance compared to C Series while minimizing overall fluid consumption
  • Advanced controls manage pump and engine interface to optimize performance and fuel efficiency
  • Leading hydraulic multi-functioning capability enables operator to lift, swing, and rotate grapple simultaneously without impairing performance

Efficiency

  • Auto idle minimizes fuel consumption when machine is on and not actively working
  • High capacity cooling system only pulls in cool external air to maximize efficiency
  • Electrically controlled variable speed fan is modulated to provide cooling only as required, reducing fluid consumption

Comfort

  • Smooth hydraulic controls and superior balance provide market leading comfort and controllability
  • High capacity HVAC system provides dependable cooling and heating for maximum comfort
  • Improved stabilizer controls to equalize stabilizer actuation resulting in optimized uniformity of footing in varying ground conditions

Safety

  • Stabilizer movement alarm alerts bystanders of stabilizer movement
  • Pilot enable alarm alerts bystanders when pilot function is engaged
  • Ground level access of engine, fuel, pilot, and case drain filters as well as electrical service box

Durability

  • Reinforced fabricated booms with optimized cross sections designed to withstand heavy side-to-side delimbing applications and maximize lift capability
  • Field proven cooling system keeps engine and robust hydraulic system cool, extending component life
  • Larger diameter pins feature heavy-duty plating for improved durability and excluder seals to retain grease and keep free of SP contaminant

Serviceability

  • Single cylinder main boom has fewer parts to service than traditional dual cylinder lift system
  • Standard electric fill pump for hydraulic oil is at ground level for safe, easy service
  • Hinged doors provide industry-leading access to core components, daily check points, and service locations

Cat Work Tools

  • Optimized Cat XT™-6 ToughGuard™ hose routings on GLK Series grapple designed to minimize loosening of fittings and improve hose life
  • Larger GLK Series cylinder pins and bushings reduce bearing stress by 25 percent
  • Available now in both a TW “Tapered Wide” and SN “Straight Narrow,” the GLK Series grapple is suitable for additional applications
  • Standard hold valves on GLK Series log grapples improve log retention
  • GLK Series grapples feature optional three port swivel which allows mounting of grapple saw
  • DLK426 delimber knives now have larger diameter pins that reduce bearing stress by 12 percent
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