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.

Gross Power 284 HP
Engine Model Cat® C9 ACERT™
Rated Power 263 HP
Displacement 537 in³

Operating Specifications
Maximum Reach - With Attachment 26.6 ft
Maximum Reach - With Attachment - Track Harvester Configuration 32 ft
Bare Pin Lift at Maximum Reach - Without Attachment 7100 kg (15600 lb) @ 6.1 m (20 ft)
Bare Pin Lift at Maximum Reach - Without Attachment - Track Harvester Configuration 4100 kg (9100 lb) @ 9 m (29.5 ft)

Undercarriage Size D6H HD
Undercarriage Pitch 8 in
Track Gauge 102 in
Track Length 189 in
Ground Clearance 33 in
Tractive Effort 70500 lb

Hydraulic System
Pump Size - Travel Circuit 12.2 in³
Pump Size - Boom, Implements 11.59 in³
Pump Size - Saw Motor 3.36 in³

Service Refill Capacities
Fuel Tank 140 gal (US)
Pony Fuel Tank - Optional 90 gal (US)
Cooling System 16.1 gal (US)
Engine Oil 10.3 gal (US)
Hydraulic Tank 69.2 gal (US)
Hydraulic System 79.3 gal (US)
Swing Drive 2.6 gal (US)

Operating Weight - Without Attachment 59710 lb
Operating Weight - Without Attachment - Track Harvester Configuration 57440 lb

Shipping Length - With Attachment 431 in
Shipping Length - Without Attachment 340 in
Height 140 in
Width - Minimum 126 in

Dimensions - Track Harvester Configuration
Height - Without Attachment 140 in
Shipping Length - Without Attachment 453 in
Width - Minimum - Without Attachment 126 in


Powerful Performance
The Cat® C9 electronically controlled ACERT delivers power while meeting all current Tier 2 emission standards. All models contain a fuel/water separator, engine air intake heater and a dual-stage combination air cleaner with pre-cleaner.

High Capacity Cooling System
The side-by-side radiator/oil cooler gives excellent cooling capacity for high production bunching and harvesting. The optional on-demand Flexxaire™ fan activates only when required and allows the cooling fan to purge debris from the radiator area, keeping a cleaner cooling system. The IQAN control system infinitely controls blade pitch angle to reduce horsepower demand from the cooling package, and lower operating costs.

Engine Oil
Caterpillar® engine oil is formulated to optimize engine life and performance and is recommended for use in Cat diesel engines. The engine oil change interval has been increased to 500 hours.

The clamshell engine compartment provides easy access to oil filters, oil dipstick, hydraulic fill pump and hoses reducing maintenance time.

Low Exhaust Emissions
The Cat C9 ACERT engine is a low emission engine designed to meet US EPA off-road Tier 2 emission regulations.

Pony Tank
An optional add on fuel tank is available for all 500 ZTS track feller buncher and track harvester models. The additional 90 gallon fuel capacity allows for increased work hours and productivity by reducing work stoppages needed for refueling machines.

An optional starting aid for colder climates is available for all 500 ZTS track feller buncher and harvester models. This option provides two (2) additional batteries, a HD starter, and HD battery cables.

Hydraulic Packages

Electric Hydraulic Oil fill Pump
The hydraulic oil site gauge provides easy visibility to know when hydraulic oil needs to be added. An easy accessible service wand allows hydraulic oil to be pumped through the hydraulic filtering system and into the tank. This reduces maintenance time and helps to maintain oil cleanliness requirements.

Variable Displacement Pump
Cat® 511 ZTS Track Feller Bunchers and Harvesters contain a dedicated variable displacement pump for travel circuit and implement functions, and a dedicated variable displacement pump for felling attachments. Cat 521/522/532 ZTS Track Feller Bunchers and Harvesters contain a dedicated 200 cc variable displacement pump for travel circuit, a 190 cc variable displacement pump for boom and implement functions, and a dedicated 55 cc variable displacement pump for felling and processing attachments. Optional hydraulic configurations for dangle harvesting heads and intermittent saw heads are available for all ZTS models.

Caterpillar® Hydraulic Oil
Provides maximum protection against mechanical and corrosive wear in all hydraulic systems. Its high zinc content reduces wear, and extends pump life. Provided certain requirements are met (e.g. S•O•SSM analysis every 500 hours), the hydraulic oil change interval is extended from 2,000 hours to 4,000 hours.

Biodegradable Hydraulic Oil
The optional biodegradable hydraulic oil (HEES) is formulated to provide excellent high-pressure and high-temperature characteristics and is fully compatible with the all hydraulic components. HEES is fully decomposed by soil or water microorganisms, providing a more environmentally-sound alternative to mineral-based oils.

ToughGuard Hoses™
Abrasion resistant hoses along the boom and stick provide strength and flexibility, increasing hydraulic hose service life. The ToughGuard cover consists of a thin layer of UHMW polyethylene bonded to the rubber cover, providing exceptional abrasion resistance. In many applications, it eliminates the need for external guarding.

Operator Comfort

Cab design optimizes post structures and window placement to provide excellent operator visibility to front, sides and rear. Standard 1.25" thick “Margard” front window maximizes operator protection. All purpose built forestry cabs are designed with heavy-duty guarding, meeting FOPS/ROPS/OPS requirements.

Fresh Air
Large sliding side window with screen to allow fresh air into cab.

Interior Operator Station
The operator station is quiet with conveniently placed controls, joysticks and an ergonomically designed seat reducing operator fatigue.

Quiet Operation
Isolation mounted cab and engine reduces sound levels and vibration for quiet and comfortable operation.

Large Storage Compartment
A large storage space behind the seat, provides sufficient room for a lunch box, hard hats and work tools.

IQAN display allows the operator to continuously monitor the operating systems of the machine. This provides early warning for potential problems, and allows the operator to adjust control parameters maximizing performance and productivity.

Control Convenience
Each control is placed within easy reach of the operator. Joysticks control the implement and attachment functions, providing easy operation.

Foot Pedals
Ergonomically located pedals with side-by-side foot rests provide for maximum operator comfort while operating machine travel.

A unique large polycarbonate skylight provides excellent upward visibility, and acts as an alternate escape hatch.

Electrical System
24-volt electrical system with in-cab 24-12 volt converter, dual in-cab 12 volt power points and one 24 volt power point. Power is provided by two 12 volt maintenance free batteries and 95 amp alternator. An optional cold weather starting attachment may be selected to provide two additional batteries, a HD starter, and HD cables.

Leveling System

Tilt Mechanism
With the most robust tilt mechanism in the industry, the ZTS tilting models (522 and 532) have a patented 3-cylinder tilt mechanism with simultaneous tilting forward and side-to-side. Trunion cylinders are mounted on 2” (51 mm) steel plates and transfer vertical loads down to the interface of the track frames and carbody, putting the load into the track and ground.

Three-cylinder tilt mechanism with simultaneously 20 degree forward tilt and 11 degree side-to-side tilt.

Ground Clearance
ZTS machines have excellent ground clearance and open carbody design. This provides increased mobility by eliminating debris interference and other obstacles encountered in rugged working conditions.


Precision welded, high-wide carbody has strong frames that reduce flexing and increase reliability of rollers and track links throughout the life of the machine. Nine bottom rollers per side.

Travel Motor
Proven final drives and travel motors provide up to 85,000 lbs (38 555 kg) of tractive effort on the 532 giving excellent traction and power to the ground.

Track Guards
Integrated welded track guards provided on the 511 and 521, with bolt-on track guards provided on the 522 and 532 leveling machines.

Leveling 522 and 532 models feature a bolted track frame to carbody design. This provides a standard gauge width, or allows adjustment to a wide gauge width to improve machine stability, and increase productivity on steep slope applications.

Boom and Stick

With up to 15,600 lb (7100 kg) of bare pin lift capacity at 20' (6.1 m) on the 532 track feller buncher, the 500 series machines are dominant over competitors in their size classes. With market leading lift capacity, 26.6' (8.1 m) of maximum reach, and tight stick tuck-in capabilities, these machines deliver high performance felling in all applications. The 532 track harvester delivers the same high performance with 9,100 lbs (4100 kg) of bare pin lift capacity and 32' (9.8 m) of maximum reach.


From plantation thinning to select cut of large diameter wood, Cat® felling attachments provide reliable productive felling solutions. These range in cut capacity from 22" to 24". Designed to allow maximum visibility of the cutting area, all saws utilize high pressure hydraulics for fast saw recovery and quick arm speed. This provides a positive impact on production and better tree control.

All models are available with a standard 40 degree partial lateral tilt, or an optional 220 degree full lateral tilt.

Owning and Operating Costs

ACERT Technology Fuel Economy
Based on Caterpillar® testing, the fuel economy of Cat® engines with ACERT technology is 3 to 5 percent better than current competing technologies. This fuel economy is directly related to the complete combustion of fuel due to the integration between the electronic control that monitors conditions, the air management system that controls air volume and the fuel injection system that delivers just the right amount of fuel as needed.

Clam-Shell Service Doors
The hydraulically actuated clam-shell service doors provide easy and quick access reducing machine maintenance time. Less service time means less down time, more work time and greater productivity.


Extended Service Intervals
Caterpillar® service and maintenance intervals have been extended to reduce machine service time, increase machine availability and reduce operating costs. Hydraulic oil change intervals can be extended from 2,000 hours to 4,000 hours. Engine coolant change intervals are 12,000 hour with Cat® Extended Life Coolant/Anti-freeze. Regularly scheduled maintenance extends machine service life and lowers overall operating costs. 500-hour oil change interval reduces overall maintenance costs.

Flexxaire™ Fan
Optional Flexxaire™ fan operates only when required and allows the fan blades to reverse, purging debris from the radiator area, reducing maintenance time, and fuel consumption.

Clam-Shell Service Door
The hydraulically actuated clam-shell service door provides easy and quick access reducing machine maintenance time.

Customer Focus

Product Support
Your Cat® dealer will help provide you with parts quickly and efficiently by utilizing the Cat worldwide dealer network parts system, minimizing downtime.

Machine Selections
Make detailed comparisons of the machines you are considering before you buy. What are job requirements, machine attachments and operating hours? What production is needed? Your Cat dealer can provide recommendations.

Look past the initial price. Consider the financing options available as well as day-to-day operating costs. This is also the time to look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run.

Customer Support Agreements
Cat dealers offer a wide variety of product support agreements, and work with customers to develop a plan that best meets specific needs. These plans can help protect your investment.

Improving operating techniques can boost your profits. The Cat Forest Products Consulting Services Group offers certified operator training classes to help maximize the return on your machine investment.

Maintenance Services
Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as S•O•SSM Analysis and Coolant Sampling and Technical Analysis help avoid unscheduled repairs.

Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

Standard Equipment

  • 24-volt electrical system
  • 2-12 volt maintenance free batteries with 950 CCA
  • 95 Amp alternator
  • IQAN programmable controls
  • MDL large display screen
  • 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
  • Dual joystick control
  • Reverse slope windshield
  • Air ride seat
  • Skylight - alternate escape hatch
  • Top escape hatch
  • 3 inch retractable seat belt
  • 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
  • C9 ACERT engine meets Tier 2 emissions requirements
  • Infinitely variable travel speed
  • Under hood centrifugal precleaner and primary air filter
  • 43C degree ambient temperature cooling package
  • Electric fuel priming pump
  • Fuel water separator
  • Track roller guards with access holes
  • Hydraulic track adjusters
  • Double flange track rollers
  • GFT80 Lohmann final drives
  • Caterpillar D6H HD grease lubricated and swaged undercarriage components
  • Welded, non-leveling carbody
Other Standard Equipment
  • Vandalism protection
  • Spare hose storage area
  • Grease gun bracket and storage area
  • 140 US gallon fuel tank
  • Dedicated pilot pump
  • Two dedicated variable displacement track pump and implement pump
  • 30 gpm dedicated saw pump
  • Cat® 325C swing drive and swing motor
  • Electric hydraulic oil fill pump
  • 70 US gal hydraulic tank
  • 50% concentration extended life coolant

Optional Equipment

Track Systems
  • 24" SG pads, clipped corners, with mud/snow reliefs
  • 24" DG pads, clipped corners, with mud/snow reliefs
  • 28" SG pads, clipped corners, with mud/snow reliefs
  • 28" DG pads, clipped corners, with mud/snow reliefs
  • 36" Tri-track, clipped corners, with mud/snow reliefs
  • Star Carrier Rollers
Other Equipment
  • Starting Aid, Cold Weather
  • Starting Aid, Arctic
  • Pony Tank, additional 90 US gal (341 L) fuel capacity
  • Flexxaire™ Fan
Field Installed Attachments
  • CD Player with AM/FM Stereo - remote capable
  • Skylight, peaked, removable
  • Loose Linkage Arrangements