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Trailer Mount Knuckleboom Loaders(Non Current)

A benchmark for the industry, Caterpillar knuckleboom loaders set new standards in performance, controllability and safety.

519 Knuckleboom Loader

Cat® trailer-mount knuckleboom loaders feature hydraulic systems that provides smooth performance and fuel efficiency. High swing torque, swing speed and lift capacity reduce cycle times and lower cost per ton. The heavy-duty booms and structures provide reliable operation and reduce service costs. Spacious work stations, excellent visibility, and ergonomic controls reduce operator fatigue, resulting in a more productive shift. A wide range of machine sizes with optional factory installed hydraulic packages are available to increase loader utilization. Options include bar slasher, circle saw slasher, delimber, carrier and grapple saw.

Product Details


Gross Power 116.3 kW
Cat® Diesel Engines C6.6 Tier 3
Engine RPM (Rated) 2200 RPM

Operating Specifications

Knuckleboom Length 8.2 m
Stabilizers (4) - Pad Size 55.8 cm × 66 cm (22 in × 26 in)
Swing Bearing - Diameter - OD 109.2 cm


Operating Weight 8663 kg
Counterweight 498.9 kg
Operating Weight* 8663 kg

Hydraulic System

Flows @ Rated Speed 166, 124, 83 L/min (44, 33, 22 gal/min)
Swing Speed 8 RPM
System Pressure 15513 kPa

Service Refill Capacities

Fuel 268.8 L
Hydraulic 132.5 L

Operator Station

Unprecedented visibility and comfort

The operator station is designed with comfort in mind. The spacious cab features a large, fully adjustable suspension seat with lumbar support. Fold-up armrests are fully adjustable to allow adjustment of the joystick controls to match the operator for ease of operation and increased performance.Excellent visibility of the work area is provided through large tinted cab windows. Overhead visibility is maximized through the large, tinted Lexan skylight. Operator protection is afforded through the front guard. This swing-out guard is designed for quick and simple access to allow cleaning of the front window.

Hydraulic Packages

Factory installed hydraulic packages increase job site performance and versatility

Cat knuckleboom loader hydraulic systems are designed to satisfy the productivity demands of loggers.The 519 is equipped with a simple open-center hydraulic system with a triple section gear pump supplying the flow. This system is time tested and provides good performance and provides many different types of option packages, such as carrier hydraulics for millyard mobility and slasher hydraulics for cutting trees into log lengths.

Complete Customer Care

Service you can count on

Product Support

Cat dealers utilize a worldwide parts network to minimize machine downtime. Plus you can save money with Cat remanufactured components.

Machine Selection

Make detailed comparisons of machines you are considering. What are the job requirements and machine attachments? What production is needed? Your Cat dealer can provide recommendations.


Consider financing options and day-to-day operating costs. Look at dealer services that can be included in the machine’s cost to yield lower owning and operating costs over time.

Customer Support Agreements

Cat dealers offer a variety of customer support agreements and work with you to develop a plan to meet specific needs. These plans can cover the entire machine, including attachments, to help protect your investment.


Improving operating techniques can boost your profits. Your Cat dealer has videos, literature, and other ideas to help you increase productivity. Caterpillar also offers simulators and certified operator training to help maximize the return on your investment.


Repair, rebuild, or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.
    •  Cat® C6.6 116.3 kW (156 hp) Tier 3 Compliant
    •  Electrical
    •  Pump Drive
  • Cat® C6.6 116.3 kW (156 hp) Tier 3 Compliant
    • Electrical
      • Pump Drive
          •  97.8 cm × 142.2 cm (38.5 in × 56 in) Right Side Mounted with Isolation Pads
          •  Tinted Safety Glass Windows, Lexan Skylight, Sun Visor
          •  Fully Adjustable Seat with Fold-up Armrest
          •  Operator Protection Guard
          •  Pressurized Cab with Heat/Air Conditioning
          •  Integral Heat/AC Ductwork
          •  Analog Gauges
          •  Windshield Wiper/Washer
          •  Horn
          •  Defroster Fan
          •  12V Power Point
          •  Dome Light
          •  Fire Extinguisher
          •  Sliding Cab Window
          •  Radio Ready (Speakers, AM/FM Antenna)
          •  3 In-line Gear Pumps, Pilot Pump
          •  Swing Motor
          •  Controls
          •  Filtration
          •  Swivel
          •  Serviceability
        • STRUCTURAL
          •  Boom
          •  Grapple Mounting Knuckle
          •  Lower Frame
          •  Turntable Mounting
        • Boom
          • Grapple Mounting Knuckle
            • Lower Frame
              • Turntable Mounting
                • ENGINES AND DRIVE LINE
                  •  Electrical
                • Electrical
                  • OPERATORS STATION
                    •  AM/FM/CD Radio
                  • AM/FM/CD Radio
                    • HYDRAULIC SYSTEM
                      •  Auxiliary Hydraulics
                    • Auxiliary Hydraulics
                      • STRUCTURAL
                        •  Booms
                        •  Heels
                        •  Turntable Mounting
                      Built for it