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Built for power, reliability, low maintenance, excellent fuel economy and low emissions.

Hydraulic Packages

Powerful hydraulic system combined with a powerful boom and stick maximize productivity in any felling or harvesting job.

Operator Comfort

The interior layout maximizes operator space, provides exceptional comfort and reduces operator fatigue.

Leveling System

Tilting mechanism provides stability and comfort in steep slope conditions.


High quality custom engineered, heavy duty forestry undercarriage.

Boom and Stick

Designed for maximum reach and lift capacity.


Caterpillar® disc saw attachments are available to meet felling needs.

Owning and Operating Costs

Cat® 500 Series Track Feller Bunchers and Track Harvesters provide the best value for your operation.


Extended Service intervals and easy access reduce operating costs.

Customer Focus

Cat® dealer services help you operate longer with lower costs.

521 Standard Equipment

  • 24-volt electrical system
  • 2-12 volt maintenance free batteries with 950 CCA
  • 95 Amp alternator
  • IQAN programmable controls
  • MDL large display screen

  • Hydraulically actuated hinged engine enclosure with warning alarm
  • Engine fan guard
  • Bottom guards
  • Isolation mounted cab and engine
  • Heavy duty radiator guard door

Operator Environment
  • Dual joystick control
  • Reverse slope windshield
  • Air ride seat
  • Skylight - alternate escape hatch
  • Top escape hatch
  • 3 inch retractable seat belt
  • Heater/air conditioner w/climate control
  • DIN mount radio ready
  • Operator sound suppression to standards
  • Travel alarm
  • Cup holders (2)
  • 2-l2volt and 1-24 volt power outlets
  • Front Window, 1.25 in Thick Margard

  • C9 ACERT engine meets Tier 2 emissions requirements
  • Infinitely variable travel speed
  • Under hood centrifugal precleaner and primary air filter
  • 43C degree ambient temperature cooling package
  • Electric fuel priming pump
  • Fuel water separator

  • Track roller guards with access holes
  • Hydraulic track adjusters
  • Double flange track rollers
  • GFT80 Lohmann final drives
  • Caterpillar D6H HD grease lubricated and swaged undercarriage components
  • Welded, non-leveling carbody

Other Standard Equipment
  • Vandalism protection
  • Spare hose storage area
  • Grease gun bracket and storage area
  • 140 US gallon fuel tank

  • Dedicated pilot pump
  • Two dedicated variable displacement track pump and implement pump
  • 30 gpm dedicated saw pump
  • Cat® 325C swing drive and swing motor
  • Electric hydraulic oil fill pump
  • 70 US gal hydraulic tank

  • 50% concentration extended life coolant

521 Optional Equipment

Track Systems
  • 24" SG pads, clipped corners, with mud/snow reliefs
  • 24" DG pads, clipped corners, with mud/snow reliefs
  • 28" SG pads, clipped corners, with mud/snow reliefs
  • 28" DG pads, clipped corners, with mud/snow reliefs
  • 36" Tri-track, clipped corners, with mud/snow reliefs
  • Star Carrier Rollers

Other Equipment
  • Starting Aid, Cold Weather
  • Starting Aid, Arctic
  • Pony Tank, additional 90 US gal (341 L) fuel capacity
  • Flexxaire™ Fan

Field Installed Attachments
  • CD Player with AM/FM Stereo - remote capable
  • Skylight, peaked, removable
  • Loose Linkage Arrangements


A robust undercarriage utilizes proven components, customized for demanding forestry conditions. The unique boom design provides industry leading lift capacity throughout full reach range, a benefit in large timber. Four models are available with just the right horsepower, track size and hydraulic configurations to fit your application needs.


Gross Power 284.0 hp 211.8 kW Less
Engine Model Cat® C9 ACERT™ Cat® C9 ACERT™ Less
Rated Power 263.0 hp 196.1 kW Less
Displacement 537.0 in3 8.8 L Less

Hydraulic System

Pump Size - Boom, Implements 10.4 in3 170.0 cm3 Less
Pump Size - Saw Motor 3.4 in3 55.0 cm3 Less
Pump Size - Travel Circuit 11.0 in3 180.0 cm3 Less

Operating Specifications

Max Reach w/ Head 32.0 ft 9.8 m Less
Bare Pin Lift at Max Reach w/o Head 4100 kg (9,100 lb) @ 9.0 m (29.5 ft) 4100 kg (9,100 lb) @ 9.0 m (29.5 ft) Less
Ground Clearance 33.0 in 838.0 mm Less
Maximum Drawbar Pull 66400.0 lb 30118.5 kg Less

Service Refill Capacities

Cooling System 16.1 gal 61.0 L Less
Engine Oil 10.3 gal 39.0 L Less
Hydraulic System 79.3 gal 300.0 L Less
Hydraulic Tank 69.2 gal 262.0 L Less
Pony Fuel Tank (Optional) 90.0 gal 341.0 L Less
Swing Drive 2.6 gal 10.0 L Less
Fuel Tank 140.0 gal 530.0 L Less


Operating Weight w/o Head 57440.0 lb 26050.0 kg Less
Est Operating Weight 57440.0 lb 26054.4 kg Less


Number of Rollers 9 per side 9 per side Less
Track Gauge 2591 mm to 2870 mm (102 in to 113 in) 2591 mm to 2870 mm (102 in to 113 in) Less
Track Length 189.0 in 4801.0 mm Less
Undercarriage (size/pitch) D6H HD/203.2 mm (8 in) D6H HD/203.2 mm (8 in) Less
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