579D Knuckleboom Loader

Overview
Gross Power
173 hp
Knuckleboom Length
32 ft
Operating Weight
36,500 lb

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
10 rpm
Note
*Theoretical
Maximum Reach - Standard Boom
32 ft
Swing Bearing - Diameter - Ball Path
44 in
Swing Torque*
73,800 ft·lbf
Tail Swing
108 in
Knuckleboom Length
32 ft
Swing Speed
10 r/min
Note
*Theoretical

Weights

Operating Weight
36,500 lb
Counterweight
1,440 lb
Operating Weight without Grapple
36,500 lb
Operating Weight
36,500 lb
Counterweight
1,440 lb
Operating Weight - Without Grapple
36,500 lb

Hydraulic System

Cylinders – Main
one
Cylinders – Stick
one
Hydraulic Pressure – System
3,625 psi
Hydraulic Pressure – Swing
3,625 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
3,625 psi
Hydraulic Pressure - System
3,625 psi

Service Refill Capacities

Hydraulic Tank
80 gal
Fuel Tank
100 gal
Engine Oil
2 gal
Cooling System
8 gal
Swing Drive
3 gal
DEF Tank
5 gal
Hydraulic Tank
80 gal (US)
Fuel Tank
100 gal (US)
Cooling System
8 gal (US)
Engine Oil
2 gal (US)
Swing Drive
3 gal (US)
DEF Tank
5 gal (US)

Dimensions

Height to Top of Cab
159 in
Stabilizer Pad Size
508 × 711 mm (20 × 28 in)
Stabilizer Reach Below Grade
16 in
Stabilizer Spread - Maximum Down Reach
167 in
Stabilizer Spread - Grade
184 in
Note
579D dimensions are on suspension trailer.
Height - Top of Cab
159 in
Note
579D dimensions are on suspension trailer.

Standards

OFPS
OFPS cab meets SAE J2267

Shipping Dimensions - Mounted Trailer

Width
101 in
Height
159 in

GLK Series Grapples – GLK55

Height (open/excluding rotation)
47 in
Height (open/including rotation)
68 in
Weight (excluding rotation)
1,411 lb
Weight (including rotation)
1,911 lb
Area (tip to tip)
4 ft2
Open
54 in
Close
5 in
Note
All specifications are approximate.

GLK Series Grapples – GLK48

Height (open/excluding rotation)
45 in
Height (open/including rotation)
66 in
Weight (excluding rotation)
1,407 lb
Weight (including rotation)
1,907 lb
Area (tip to tip)
3 ft2
Open
48 in
Close
5 in
Note
All specifications are approximate.

GLK Series Grapples - GLK48

Area (tip to tip)
3 ft²
Close
5 in
Height - Open - Excluding Rotation
45 in
Height - Open - Including Rotation
66 in
Note
All specifications are approximate.
Open
48 in
Weight - Excluding Rotation
1,407 lb
Weight - Including Rotation
1,907 lb

GLK Series Grapples - GLK55

Area (tip to tip)
4 ft²
Close
5 in
Height - Open - Excluding Rotation
47 in
Height - Open - Including Rotation
68 in
Note
All specifications are approximate.
Open
54 in
Weight - Excluding Rotation
1,411 lb
Weight - Including Rotation
1,911 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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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