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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. 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.

Cat Specs


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


Operating Weight
36480 lb
Operating Weight - Without Grapple
36480 lb
Operating Weight - Less Grapple
36480 lb

Operating Specifications

Knuckleboom Length
32 ft
Swing Speed
9.5 r/min
Swing Bearing - Diameter - Ball Path
43.5 in
Maximum Reach - Standard Boom
32 ft
Swing Torque
73800 ft-lb
Standard Knuckleboom Reach to Pin
32 ft
Tail Swing
108.2 in

Hydraulic System

Cylinders - Main
Cylinders - Stick
Hydraulic Pressure - Swing
3500 psi
Hydraulic Pressure - System
3500 psi
Hydraulic Oil Flow at 1,800 rpm
230/230 L (60/60 gal)
Cylinders - Stabilizers


Stabilizer Spread - Maximum Down Reach
166.8 in
Stabilizer Pad Size
508 × 711 mm (20 × 28 in)
Stabilizer Reach Below Grade
12.8 in
Stabilizer Spread - Grade
183.8 in
Height - Top of Cab
161.9 in

Service Refill Capacities

Cooling System
7.5 gal (US)
Hydraulic Tank
80 gal (US)
Engine Oil
4 gal (US)
Fuel Tank
100 gal (US)
Swing Drive
2.6 gal (US)

Shipping Dimensions - Mounted Trailer

101.3 in
161.9 in


cab meets SAE J2267