521B Track Felller Buncher

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.

Engine

Gross Power: 303.0 hp

Operating Specifications

Max Reach w/ Attachment: 26.5 ft

Hydraulic System

Pumps: Dedicated variable displacement pump for saw motor - 55 cc
Pumps: Electric hydraulic oil fill pump
Pumps: Dedicated variable displacement pump for travel circuit - 200 cc
Pumps: Dedicated variable displacement pump for boom and implement functions - 200 cc

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

Weights

Operating Weight w/o Attachment: 60629.0 lb

Power Train

Displacement: 537.0 in3
Engine Model: CatÂ® C9 ACERTâ„¢
Gross Power: 303.0 hp
Gross Power @ 1,800 rpm: 303.0 hp
Rated Power @ 2,100 rpm: 282.0 hp

Boom System

Track Feller Buncher - Lift over front of tracks: Bare Pin Lift @ Maximum Reach (without head): 6100 kg @ 6.2 m (13,500 lb @ 20 ft 6 in)
Track Feller Buncher - Lift over front of tracks: Maximum Reach (with head): 26.5 ft

Undercarriage

Pitch: 8.5 in
Size: 330 EX (D7)

Standards

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

Operating Weights (without heads, standard counterweight)

Track Feller Buncher - 521B: 60629.0 lb

Track Gauge

521B: 102.0 in

Track Length

Track Length: 191.1 in

Ground Clearance

Ground Clearance: 35.0 in

Tractive Effort

521B: 70500.0 lb

LINKAGES
- Intermittent
- Feller Buncher
- Omission - Linkage
HYDRAULICS
- Intermittent
- Feller Buncher - Low Flow
- Feller Buncher - High Flow
FELLING HEADS
- HF201B*
- *Heads available with Full Tilt 330 degree, or Partial Tilt 40 degree
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