521B

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.


SPECIFICATIONS
Engine
Gross Power 303 HP


Hydraulic System
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


Operating Specifications
Maximum Reach - With Head 32.5 ft


Service Refill Capacities
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)


Weights
Operating Weight - Without Head 59450 lb


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


Undercarriage
Pitch 8.5 in
Size 330 EX (D7)


Power Train
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


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


Track Gauge
521B 102 in


Track Length
Track Length 191.1 in


Ground Clearance
Ground Clearance 35 in


Tractive Effort
521B 70500 lb


BENEFITS & FEATURES
Power Train



Hydraulic Packages



Operator Station



Undercarriage



Boom and Stick



Sustainability



Serviceability



Customer Support



EQUIPMENT
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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