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521B Track Harvester

The new B Series track feller bunchers feature smoother hydraulic performance, increased engine HP, a more comfortable operator station and better right side operator visibility. The Cat 521B Series are zero tail swing machines designed for medium to high production clear cut and or select cut on rough terrain. These machines perform in a variety of small through larger tree size applications. 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.

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SPECIFICATION SUMMARY
  • Gross Power 303.0 hp
  • Cooling System 10.8 gal
  • Engine Oil 10.3 gal
  • Hydraulic System 118.0 gal

PRICE (USD)
Call 800-637-5000 for rate information

Engine

  • Gross Power
    303.0 hp
  • Gross Power
    303 HP

Service Refill Capacities

  • Cooling System
    10.8 gal
  • Engine Oil
    10.3 gal
  • Hydraulic System
    118.0 gal
  • Swing Drive
    2.6 gal
  • Fuel Capacity
    226.0 gal
  • Cooling System
    10.8 gal (US)
  • Engine Oil
    10.3 gal (US)
  • Hydraulic System
    118 gal (US)
  • Swing Drive
    2.6 gal (US)
  • Fuel Capacity
    226 gal (US)

Undercarriage

  • Pitch
    8.5 in
  • Size
    330 EX (D7)
  • Pitch
    8.5 in
  • Size
    330 EX (D7)

Hydraulic System

  • Pumps
    Dedicated variable displacement pump for travel circuit - 200 cc
  • Pumps
    Dedicated variable displacement pump for boom and implement functions - 200 cc
  • Pumps
    Electric hydraulic oil fill pump
  • Pumps (1)
    Dedicated variable displacement pump for travel circuit - 200 cc
  • Pumps (2)
    Dedicated variable displacement pump for boom and implement functions - 200 cc
  • Pumps (3)
    Electric hydraulic oil fill pump

Track Gauge

  • 521B
    102.0 in
  • 521B
    102 in

Standards

  • Cab
    Cab meets FOPS/OPS/ROPS/WCB/OR-OSHA requirements
  • Cab
    Cab meets FOPS/OPS/ROPS/WCB/OR-OSHA requirements

Power Train

  • Displacement
    537.0 in3
  • Engine Model
    Cat® C9 ACERT™
  • Gross Power
    303.0 hp
  • Gross Power @ 1,800 rpm
    303.0 hp
  • Rated Power @ 2,100 rpm
    282.0 hp
  • Displacement
    537 in³
  • Engine Model
    Cat® C9 ACERT™
  • Gross Power
    303 HP
  • Gross Power - 1,800 rpm
    303 HP
  • Rated Power - 2,100 rpm
    282 HP

Ground Clearance

  • Ground Clearance
    35.0 in
  • Ground Clearance
    35 in

Track Length

  • Track Length
    191.1 in
  • Track Length
    191.1 in

Tractive Effort

  • 521B
    70500.0 lb
  • 521B
    70500 lb

Operating Specifications

  • Maximum Reach - With Head
    32.5 ft

Weights

  • Operating Weight - Without Head
    59450 lb

Boom System

  • Track Harvester Configuration - Lift Over Front of Tracks: Bare Pin Lift at Maximum Reach - Without Head
    4000 kg @ 9.8 m (8,800 lb @ 32 ft 5 in)
  • Track Harvester Configuration - Lift Over Front of Tracks: Maximum Reach - With head
    32.5 ft

Operating Weights - Without Heads, Standard Counterweight

  • Track Harvester Configuration - 521B
    59450 lb

Power Train

Hydraulic Packages

Operator Station

Undercarriage

Boom and Stick

Sustainability

Serviceability

Customer Support

Standard Equipment:

  • Electrical
    • 24 volt electrical system
    • Two 12 volt maintenance free batteries with 950 CCA
    • 95 Amp alternator
    • IQAN programmable controls
    • MD3 monitor display screen
  • Guards
    • 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
    • OPS/FOPS/ROPS/WCB/OR-OSHA certified cab
    • Dual joystick control
    • Reverse slope windshield
    • Air ride seat
    • Skylight - alternate escape hatch
    • Top escape hatch
    • 76.2 mm (3 in) retractable seat belt
    • DIN mount radio ready with speakers
    • Operator sound suppression to standards
    • Travel alarm
    • Cup holders (2)
    • Two 12 volt and one 24 volt power outlets
    • Front window, 32 mm (1.25 in) thick Margard
    • Positive filtered ventilation, pressurized cab with bi-level air conditioner, heater and defroster with manual control
    • Left side fresh air window with screen
    • Forced air fan
    • Washable floor mat
    • Neutral lever (lockout) for all controls
  • Power Train
    • C9 ACERT engine meets U.S. EPA emission standards
    • Variable travel speed (3 ranges)
    • Under hood primary air filter
    • 43° C (109° F) degree ambient temperature cooling package: - Aluminum core ATAAC and side-by-side radiator and oil cooler - Removable debris screen - Swing out A/C condenser
    • Electric fuel priming pump
    • Fuel water separator
  • Undercarriage
    • Track roller guards with access holes
    • Hydraulic track adjusters
    • Double flange track rollers
    • GFT80 Lohmann final drives
    • Cat 330 size undercarriage components
    • Nine (9) track rollers and two (2) carrier rollers per side
    • Welded, non-leveling carbody
  • Hydraulics
    • Dedicated fixed displacement pilot pump
    • Dedicated variable displacement pumps for track and implement functions
    • 325 EX swing drive and swing motor
    • Electric hydraulic oil fill pump
    • 265 L (70 gal) hydraulic tank
  • Antifreeze
    • 50% concentration extended life coolant
  • Other Standard Equipment
    • Heavy duty hood enclosure
    • Flexxaire fan
    • Vandalism protection
    • Spare hose storage area
    • Grease gun bracket and storage area
    • 856 L (226 gal) fuel tank

Optional Equipment:

  • Linkages
    • Harvester Long
    • Omission - Linkage
  • Hydraulics
    • Harvester
  • Track Systems
    • 610 mm (24 in) SG pads, clipped corners, with mud/snow reliefs
    • 711 mm (28 in) SG pads, clipped corners, with mud/snow reliefs
    • 711 mm (28 in) DG pads, clipped corners, with mud/snow reliefs
    • 914 mm (36 in) Tri-track, clipped corners, with mud/snow reliefs
    • Star Carrier Rollers
    • Standard Carrier Rollers
  • Other Equipment
    • Lighting Gp-HID, replaces certain standard lights
    • Heavy Counterweight
    • Starting Aid, Cold Weather - includes two additional batteries
    • Starting Aid, Arctic - includes engine and hydraulic oil Arctic heater
  • Field Installed Attachments
    • Skylight, peaked, removable
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