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521B Track Harvester

521B Track Harvester

At a Glance

Gross Power
303 HP
Maximum Reach - With Head
32.5 ft
Operating Weight - Without Head
59450 lb
Cooling System
10.8 gal (US)
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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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Gross Power 303HP

Operating Specifications

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Maximum Reach - With Head 32.5ft


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Operating Weight - Without Head 59450lb

Service Refill Capacities

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

Boom System

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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 32.5ft

Operating Weights - Without Heads, Standard Counterweight

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Track Harvester Configuration - 521B 59450lb

Hydraulic System

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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


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


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Pitch 8.5in
Size 330 EX (D7)

Power Train

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Displacement 537in³
Engine Model Cat® C9 ACERT™
Gross Power 303HP
Gross Power - 1,800 rpm 303HP
Rated Power - 2,100 rpm 282HP

Track Gauge

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521B 102in

Track Length

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Track Length 191.1in

Ground Clearance

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Ground Clearance 35in

Tractive Effort

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521B 70500lb