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521 Track Feller Buncher
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.
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Benefits & Features
Specifications
Standard Equipment
Optional Equipment
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Operator Comfort
The interior layout maximizes operator space, provides exceptional comfort and reduces operator fatigue.
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Leveling System
Tilting mechanism provides stability and comfort in steep slope conditions.
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Undercarriage
High quality custom engineered, heavy duty forestry undercarriage.
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Boom and Stick
Designed for maximum reach and lift capacity.
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Versatility
Caterpillar® disc saw attachments are available to meet felling needs.
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Owning and Operating Costs
Cat® 500 Series Track Feller Bunchers and Track Harvesters provide the best value for your operation.
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Customer Focus
Cat® dealer services help you operate longer with lower costs.
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Hydraulic Packages
Powerful hydraulic system combined with a powerful boom and stick maximize productivity in any felling or harvesting job.
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Serviceability
Extended Service intervals and easy access reduce operating costs.
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Powertrain
Built for power, reliability, low maintenance, excellent fuel economy and low emissions.
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| | | Engine | |
| Gross Power | 284 hp |
| | | Operating Specifications | |
| Max Reach w/ Attachment | 26.6 ft |
| | | Weights | |
| Operating Weight w/o Attachment | 59710 lb |
| | | Engine | |
| Engine Model | Cat® C9 ACERT™ |
| Rated Power | 263 hp |
| Displacement | 537 in3 |
| | | Weights | |
| Operating Weight w/o Attachment (track harvester configuration) | 57440 lb |
| | | Operating Specifications | |
| Max Reach w/ Attachment (track harvester configuration) | 32 ft |
| Bare Pin Lift at Max Reach w/o Attachment | 7100 kg (15600 lb) @ 6.1 m (20 ft) |
| Bare Pin Lift at Max Reach w/o Attachment (track harvester configuration) | 4100 kg (9100 lb) @ 9 m (29.5 ft) |
| | | Hydraulic System | |
| Pump Size - Travel Circuit | 12.2 in3 |
| Pump Size - Boom, Implements | 11.59 in3 |
| Pump Size - Saw Motor | 3.36 in3 |
| | | Track | |
| Undercarriage Size | D6H HD |
| Undercarriage Pitch | 8 in |
| Track Gauge | 102 in |
| Track Length | 189 in |
| Ground Clearance | 33 in |
| Tractive Effort | 70500 lb |
| | | Service Refill Capacities | |
| Fuel Tank | 140 gal |
| Pony Fuel Tank (Optional) | 90 gal |
| Cooling System | 16.1 gal |
| Engine Oil | 10.3 gal |
| Hydraulic Tank | 69.2 gal |
| Hydraulic System | 79.3 gal |
| Swing Drive | 2.6 gal |
| | | Dimensions | |
| Shipping length with attachment | 431 in |
| Shipping length w/o attachment | 340 in |
| Height | 140 in |
| Width (minimum) | 126 in |
| | | Dimensions - Track Harvester Configuration | |
| Shipping length w/o attachment | 453 in |
| Height w/o attachment | 140 in |
| Width (minimum) w/o attachment | 126 in |
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Standard Equipment
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| Electrical | |
| 24-volt electrical system | |
| Hydraulically actuated hinged engine enclosure with warning alarm | |
| OPS/FOPS/ROPS cab | |
| C9 ACERT engine meets Tier 2 emissions requirements | |
| Aluminum core ATAAC and side-by-side radiator and oil cooler | |
| Track roller guards with access holes | |
| Vandalism protection | |
| Dedicated pilot pump | |
| 50% concentration extended life coolant | |
| Guards | |
| 2-12 volt maintenance free batteries with 950 CCA | |
| Engine fan guard | |
| Dual joystick control | |
| Infinitely variable travel speed | |
| Removable debris screen | |
| Hydraulic track adjusters | |
| Spare hose storage area | |
| Two dedicated variable displacement track pump and implement pump | |
| Operator Environment | |
| 95 Amp alternator | |
| Bottom guards | |
| Reverse slope windshield | |
| Under hood centrifugal precleaner and primary air filter | |
| Swing out A/C condenser | |
| Double flange track rollers | |
| Grease gun bracket and storage area | |
| 30 gpm dedicated saw pump | |
| Powertrain | |
| IQAN programmable controls | |
| Isolation mounted cab and engine | |
| Air ride seat | |
| 43C degree ambient temperature cooling package | |
| GFT80 Lohmann final drives | |
| 140 US gallon fuel tank | |
| Cat® 325C swing drive and swing motor | |
| Undercariage | |
| MDL large display screen | |
| Heavy duty radiator guard door | |
| Skylight - alternate escape hatch | |
| Electric fuel priming pump | |
| Caterpillar D6H HD grease lubricated and swaged undercarriage components | |
| Electric hydraulic oil fill pump | |
| Other Standard Equipment | |
| Top escape hatch | |
| Fuel water separator | |
| Welded, non-leveling carbody | |
| 70 US gal hydraulic tank | |
| Hydraulics | |
| 3 inch retractable seat belt | |
| Antifreeze | |
| 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 | |
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Optional Equipment
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| Track Systems | |
| 24" SG pads, clipped corners, with mud/snow reliefs | |
| Starting Aid, Cold Weather | |
| CD Player with AM/FM Stereo – remote capable | |
| Other Equipment | |
| 24" DG pads, clipped corners, with mud/snow reliefs | |
| Starting Aid, Arctic | |
| Skylight, peaked, removable | |
| Field Installed Attachments | |
| 28" SG pads, clipped corners, with mud/snow reliefs | |
| Pony Tank, additional 90 US gal (341 L) fuel capacity | |
| Loose Linkage Arrangements | |
| 28" DG pads, clipped corners, with mud/snow reliefs | |
| Flexxaire™ Fan | |
| 36" Tri-track, clipped corners, with mud/snow reliefs | |
| Star Carrier Rollers | |
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