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


Gross Power 305.0 hp 227.4 kW Less
Engine Model Cat® C9 ACERT™ Cat® C9 ACERT™ Less
Rated Power 282.0 hp 210.3 kW Less
Displacement 537.0 in3 8.8 L Less

Operating Specifications

Max Reach w/ Attachment 28.2 ft 8.6 m Less
Max Reach w/ Attachment (track harvester configuration) 37.0 ft 11.3 m Less
Maximum Drawbar Pull 101540.0 lb 46058.0 kg Less
Bare Pin Lift at Max Reach w/o Attachment 9400 kg (21,800 lb) @ 6.6 m (21.5 ft) 9400 kg (21,800 lb) @ 6.6 m (21.5 ft) Less
Bare Pin Lift at Max Reach w/o Attachment (track harvester configuration) 5000 kg (11,000 lb) @ 10.7 m (35 ft) 5000 kg (11,000 lb) @ 10.7 m (35 ft) Less
Bare Pin Lift at Max Reach (w/o attachment - long felling linkage) 7400 kg (16,300 lb) @ 8.2 m (27 ft) 7400 kg (16,300 lb) @ 8.2 m (27 ft) Less


Undercarriage Size 345 HEX 345 HEX Less
Undercarriage Pitch 8.5 in 215.9 mm Less
Track Gauge 2591-2870 mm (102-113 in) 2591-2870 mm (102-113 in) Less
Track Length 193.0 in 4903.0 mm Less
Ground Clearance 35.0 in 889.0 mm Less
Number of Rollers 9 per side 9 per side Less
Tractive Effort 104000.0 lb 47174.0 kg Less

Hydraulic System

Pump Size - Travel Circuit 110.0 gal/min 416.4 L/min Less
Pump Size - Boom, Implements 110.0 gal/min 416.4 L/min Less
Pump Size - Saw Motor 30.0 gal/min 113.6 L/min Less

Service Refill Capacities

Fuel Tank 312.0 gal 1181.0 L Less
Cooling System 16.1 gal 61.0 L Less
Engine Oil 10.3 gal 39.0 L Less
Hydraulic Tank 85.3 gal 323.0 L Less
Hydraulic System 97.7 gal 370.0 L Less
Swing Drive 2.64 gal 10.0 L Less


Operating Weight w/o Attachment 68468.0 lb 31057.0 kg Less
Operating Weight w/o Attachment (track harvester configuration) 69175.0 lb 31377.0 kg Less
Operating Weight w/o Attachment (track harvester configuration - long felling linkage) 79339.0 lb 35988.0 kg Less


Shipping length with attachment 461.0 in 11709.0 mm Less
Shipping length w/o attachment 371.0 in 9423.0 mm Less
Height 144.0 in 3658.0 mm Less
Width 1 131.0 in 3327.0 mm Less
Width 2 142.0 in 3607.0 mm Less

Dimensions - Track Harvester Configuration

Shipping length w/o attachment 536.0 in 13614.0 mm Less
Height w/o attachment 144.0 in 3658.0 mm Less
Width 1 w/o attachment 131.0 in 3327.0 mm Less
Width 2 w/o attachment 142.0 in 3607.0 mm Less


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.

551 Standard Equipment

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

  • Twin 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 with speakers
  • Operator sound suppression to standards
  • Travel alarm
  • Cup holders (2)
  • 2-12 volt 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
  • Heavy-duty cooling package
  • Electric fuel priming pump

  • Track roller guards with access holes
  • Hydraulic track adjusters
  • Double flange bottom rollers
  • Caterpillar® 330 HEX bolted, non-leveling carbody, variable gauge
  • Caterpillar 345 undercarriage bolted, variable gauge non-leveling carbody, GFT 110 final drives

Other Standard Equipment
  • Vandalism protection
  • Spare hose storage area
  • Storage area
  • Flexxaire™ Fan
  • Fuel water separator
  • 312 US gallon fuel tank

  • Dedicated fixed displacement pilot pump
  • Dedicated variable displacement pumps for track and implement functions
  • 30 gpm variable displacement saw pump
  • Cat® 325C swing drive and swing motor
  • Electric hydraulic oil fill pump
  • 84 US gal hydraulic tank

  • 50% concentration extended life coolant

551 Optional Equipment

Track Systems
  • 24" SG pads, clipped corners, with mud/snow reliefs
  • 28" SG pads, clipped corners, with mud/snow reliefs
  • Star carrier Rollers
  • Standard Single Flange carrier Rollers

Other Equipment
  • Starting Aid, Cold Weather
  • Starting Aid, Arctic - Includes engine and hydraulic heaters

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

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