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.
Engine
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 |
Weights
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.
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.
Operation
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.
Replacement
Repair, rebuild, or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.
ENGINES AND DRIVE LINE
Cat® C6.6 116.3 kW (156 hp) Tier 3 Compliant
Electrical
Pump Drive
OPERATORS STATION
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)
HYDRAULIC SYSTEM
3 In-line Gear Pumps, Pilot Pump
Swing Motor
Controls
Filtration
Swivel
Serviceability
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