Engine Model Cat® C6.4 ACERT™
Net Flywheel Power 157 HP
ISO 9249 147 HP
J1349 147 HP
EEC 80/1269 147 HP
Bore 4.02 in
Stroke 5.12 in
Displacement 390 in³
General Forestry - HW 59315 lb
General Forestry - HD/LC 56228 lb
Log Loader (U/U) 66812 lb
Service Refill Capacities
Fuel Tank 108.3 gal (US)
Fuel Tank - Optional Auxiliary Right Front 108.3 gal (US)
Maximum Fuel with All Optional Tanks 216.6 gal (US)
Cooling System 6.6 gal (US)
Engine Oil 7.9 gal (US)
Swing Drive 2.1 gal (US)
Final Drive - Each - HW 3.4 gal (US)
Final Drive - Each - HD/LC 2.6 gal (US)
Hydraulic System - Including Tank 68 gal (US)
Hydraulic Tank 33 gal (US)
Brakes SAE J1026 APR90
Cab/FOGS/OPS/TOPS/FOPS SAE J1356 FEB88 ISO 10262/SAE J1084/ISO 8084/OR-OSHA 437-007-0775/WCB G602, G603, G604, G608
Main Implement System - Maximum Flow (2x) 54.2 gal/min
Maximum Pressure - Implements 5075 psi
Maximum Pressure - Travel 5075 psi
Maximum Pressure - Swing 3625 psi
Pilot System - Maximum Flow 11 gal/min
Pilot System - Maximum Pressure 600 psi
Boom Cylinder - Bore 4.7 in
Boom Cylinder - Stroke 49.6 in
Stick Cylinder - Bore 5.5 in
Stick Cylinder - Stroke 59.3 in
Boom Cylinder - Bore 4.7 in
Boom Cylinder - Stroke 49.6 in
Stick Cylinder - Bore 5.5 in
Stick Cylinder - Stroke 59.3 in
B1 Family Bucket Cylinder - Bore 4.7 in
B1 Family Bucket Cylinder - Stroke 43.3 in
Log Loader Linkage
Boom Cylinder - Bore 5.5 in
Boom Cylinder - Stroke 45.7 in
Stick Cylinder - Bore 5.9 in
Stick Cylinder - Stroke 57.9 in
Under/Under Heel Cylinder - Bore 5.1 in
Under/Under Heel Cylinder - Stroke 45.5 in
Maximum Travel Speed - HD/LC 3.3 mile/h
Maximum Drawbar Pull - HD/LC 42264 lb
Maximum Travel Speed - HW 2.6 mile/h
Maximum Drawbar Pull - HW 55700 lb
Swing Torque - General Forestry 45611 lb/ft
Swing Speed - General Forestry 11.5 r/min
Cat C6.4 ACERT™
The Cat® C6.4 with ACERT™ Technology gives the 320D FM exceptional power and fuel efficiency unmatched in the industry. The C6.4 meets U.S. EPA Tier 3 emissions requirements. The forestry designed hydraulics give the 320D FM exceptional power, efficiency and controllability unequaled in the industry for consistently high performance in all forestry applications.Performance
The 320D FM is equipped with the C6.4 ACERT engine, which provides 7% more horsepower as compared to the Cat 3066 T engine.Automatic Engine Speed Control
The two-stage, one-touch control maximizes fuel efficiency and reduces sound levels.ADEM™ A4 Engine Controller
The ADEM A4 electronic control module manages fuel delivery to get the best performance per liter of fuel used. The engine management system provides flexible fuel mapping, allowing the engine to respond quickly to varying application needs. It tracks engine and machine conditions while keeping the engine operating at peak efficiency.Electronic Control Module
The Electronic Control Module (ECM) works as the “brain” of the engine's control system, responding quickly to operating variables to maximize engine efficiency. Fully integrated with sensors in the engine's fuel, air, coolant, and exhaust systems, the ECM stores and relays information on conditions such as RPM, fuel consumption, and diagnostic information.Fuel Delivery
The Cat C6.4 ACERT™ features electronic controls that govern the fuel injection system. Multiple injection fuel delivery involves a high degree of precision. Precisely shaping the combustion cycle lowers combustion chamber temperatures, generating fewer emissions and optimizing fuel combustion. This translates into more work output for your fuel cost.Cooling System
The cooling fan is directly driven from the engine. An optional programmable reversible fan allows for radiator blowout, to increase service intervals and to maintain engine operational temperatures. The optimum fan speed is calculated based on the target engine speed, coolant temperature, hydraulic oil temperature and actual fan speed. The Cat C6.4 ACERT delivered a completely new layout that separates the cooling system from the engine compartment.Air Cleaner
The radial seal air filter features a double-layered filter core for more efficient filtration and is located in a compartment behind the cab. A warning is displayed on the monitor when dust accumulates above a preset level.Noise Reduction Technologies
The engine mounts are rubber-isolating mounts matched with the engine package. Further noise reduction has been achieved through design changes to the isolated top cover, oil pan, multiple injection strategy, insulated timing cover, sculpted crankcase and gear train refinements.
The 320D FM hydraulic system and component locations have been designed to provide a high level of system efficiency. The main pumps, control valves and hydraulic tank are located close together to allow for shorter tubes and lines between components that reduce friction loss and pressure drops in the lines. The layout further provides greater operator comfort by placing the radiator on the cab side of the upper structure. This allows incoming air to enter the engine compartment from the operator side and hot air and corresponding engine sound to exit on the opposite side away from the operator. This reduces engine compartment heat and sound being transmitted to the operator.Pilot System
The pilot pump is independent from the main pumps and controls the front linkage, swing and travel operations.Hydraulic Cross Sensing System
The hydraulic cross sensing system improves productivity with faster implement speeds and quicker, stronger pivot turns.Boom and Stick Regeneration Circuit
Boom and stick regeneration circuit saves energy during boom-down and stick-in operation which increases efficiency, reduces cycle times and pressure loss for higher productivity, lower operating costs and increased fuel efficiency.Fine Swing Control
Standard fine swing control cushions start and stop for better implement control.Controllability
The hydraulic system offers precise control to the 320D FM reducing operator fatigue, improving operator effectiveness and efficiency, which ultimately translates into enhanced performance.Auxiliary hydraulic Valve
The auxiliary valve is standard on the 320D FM. Control Circuits are available as attachments, allowing for operation of high and medium pressure tools such as grapples.Hydraulic Cylinder Snubbers
Snubbers are located at the rod-end of the boom cylinders and both ends of the stick cylinders to cushion shocks, reduce sound and increase cylinder life, increasing uptime and productivity.
The workstation is spacious, quiet and comfortable, assuring high productivity during a long work day. Controls, joysticks and an ergonomically designed seat reduces operator fatigue.Monitor
The monitor is a full color 400 X 234 pixels Liquid Crystal Display (LCD) graphic display. The monitor angle can be adjusted to minimize sun glare and has the capability of displaying information 27 different languages.Pre-Start Check
Prior to starting the machine, the system will check for low fluid levels for the engine oil, hydraulic oil and engine coolant and warn the operator through the monitor in the event display area.Gage Display
Three analog gauges, fuel level, hydraulic oil temperature and coolant temperature, are displayed in this area.Event Display
Machine information is displayed in this area with the icon and language.Multi-Information Display
This area is reserved for displaying various information which is convenient for the operator. The “Cat” logo is displayed when no information is available to be displayed.Seat
Seat provides a variety of adjustments to suit the operator's size and weight including fore/aft, height and weight. Wide adjustable armrests and a retractable seat belt are also included.Joystick Control
Joystick controls have low lever effort and are designed to match the operator's natural wrist and arm position. The operator can operate joystick controls with an arm on the armrest and the horizontal and vertical strokes have been designed to reduce operator fatigue. Exclusive proportional control and push buttons are programmable to operator personal preferences, allowing maximum productivity.Hydraulic Activation Control Lever
For added safety, this lever must be in the operate position to activate the machine control functions.Console
Redesigned consoles feature a simple, functional design to reduce operator fatigue, ease of switch operation and excellent visibility.Skylight
An enlarged skylight with sunshade provides excellent upwards visibility.Viewing
Cab design optimizes post structures, and scratch-resistant polycarbonate window placement to provide excellent operator visibility to front, sides and rear. Forestry cab is designed with heavy-duty guarding, meeting FOPS/OPS/FOGS/TOPS and CB requirements.
Rugged main frame design maximises durability Carbody Design
- Outer frame utilizes curved side rails, which are di-formed for excellent uniformity and strength.
- Box-section channels improve upper frame rigidity under the cab.
- Inverted U-channels span the width of the main frame and are formed,rather than fabricated, for superior strength and reduced weight.
- Boom tower and main rails are constructed of solid, high-tensile strength, steel plates.
- Boom foot and engine mount areas are reinforced for additional strength.
- Sheet metal supporting structure is improved by integrating the mounting into the upper frame structure.
Advanced, reinforced, purpose-built carbody design stands up in the toughest forest applications.Carbody Structure
Wide, tall, and thick carbody structure provides operating stability and durability while improving operation's effectiveness.
- Upper structure weight and stresses are distributed evenly across the full length of the track roller frame.
- Smooth transitions and long welds help reduce stresses at the carbodyto-roller frame junctions for excellent durability.
- Robot welding helps ensure consistent, high-quality welds throughout the manufacturing process.
Shoe Support Guards
Standard fulllength track shoe support guards help protect rollers and provide increased rigidity to track links in rough underfoot conditions.Factory Forestry Cab
Caterpillar factory forestry designed and built FOPS cab has options for windshield guard and window guards to meet local guarding requirements. The right side and rear windows are made from impactresistant polycarbonate.Heavy-Duty Access Doors
Heavy-duty access doors are standard on the 320D FM and are made from 6 mm (0.24 in), high-strength, low alloy steel. Positive locking latch stays closed in forestry applications. Hinges have larger diameter pins over standard doors. The smooth door profile enhances machine appearance.
Heavy-Duty Top Rollers
Track rollers with dual supports replace carrier rollers to assure superior endurance.Heavy-Duty Track Rollers
Heavy-duty track rollers stand up to the toughest forest applications. Features include greater sealability, higher resistance to deformation and greater load carrying capacity.Heavy-Duty Grease Lubricated Track
The 325 HD Track Link with 8 inch pitch and 8 bottom rollers is standard on the 320D FM.1) Grease Lubricated Track
2) 10% Larger Bushing Diameter
- Extends internal bushing wear life
- Reduces noise
- Provides more usable horsepower because of decreased internal friction
- Reduces chance for frozen track
• Extends external bushing wear life3) Greased Pin and Larger Bushing Combined
4) 15% Increase in Link Height
- Extends system life
- Reduces sprocket wear because the system stays matched longer
- Improves balance in component
• Increases link wear life5) 36% Wider Bushing Strap
• Improves bushing-to-link retention6) Unique Pin Retention System
• Locks the pin to the link
The Caterpillar Log Loader is Purpose
The Caterpillar log loader is purpose built for forest applications. Completely assembled, heel-type log loaders (including grapple) are available from the factory.The Caterpillar Heel-Type Loader Arrangements
The Caterpillar heeltype loader arrangements fit a wide variety of log handling and loading applications in the woods and millyards. Heel booms are especially well-suited for use with large diameter sawlogs and tree length loads.Caterpillar Roadbuilders
Caterpillar Roadbuilders can be equipped with buckets, thumbs, clamshells and clearing grapples to fit a wide range of forest road jobs.Applications Include
Moving right-of-way logs, stumping, pioneering, stripping organic material, excavating shot rock, truck loading, back sloping, ditching, finish grading and slash piling.The Caterpillar 320D FM Delimber Carrier
The Caterpillar delimber carrier can be fit with a variety of AEM delimbers.
Cat 360 Degree Continuous Rotating Log Loader Grapples
Cat 360 Degree Continuous Rotating Log Loading Grapples for Forestry Machines are high capacity tools, built for endurance in high-volume logging applications. GLL grapple legs are made of high-strength alloy steel with unique leg profiles for maximum performance in picking/sorting, bunching/loading or shoveling applications. Large bunches of stems or single large logs are easily handled by the wide grapple opening (60"/1524 mm), while interlocking legs close down to 5"/127 mm for picking and sorting. Cat grapples have bolt-on access panels allowing for easy serviceability and are backed by the world-class Caterpillar Dealer Network.360-Degree Continous Rotation
High torque hydraulic motor positions the grapple precisely for rapid sorting and loading.Hydraulic Cylinders
Heavy-duty wall construction delivers durability and maximum closing power move the maximum amount of wood per pass.Legs
Built with high-strength alloy steel for maximum durability. Optimized profile performs equally well whether sorting, bunching or shoveling.Pin
Induction-hardened alloy pins float, decreasing wear.Serviceability
Bolt-on access panels protect the grapples internal components, while providing easy access. Long service intervals and infield servicing result in more uptime and lower operating costs.
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.Radiator Compartment
The radial air filter has a double layered filter core for more efficient filtration and is located in a compartment behind the cab. Easy access doors allows for easy, faster cleanout minimizing down time. Heavy-duty screen filters assembled on the door keep debris away from the radiator compartment, extending service intervals.
Ground Level Service
The design and layout of the 320D FM was made with the service technician in mind. Many service locations are easily accessible at ground level allowing critical maintenance to get done quickly and efficiently.Air Filter Compartment
The air filter features a double-element construction for superior cleaning efficiency. When the air cleaner plugs, a warning is displayed on the monitor screen inside the cab. Pump Compartment. A service door on the right side of the upper structure allows ground-level access to the pump and pilot filter.Radiator Compartment
The left rear service door allows easy access to the engine radiator, oil cooler and air-to airaftercooler. A reserve tank and drain cock are attached to the radiator for simplified maintenance.Grease Lubricated Track
Grease lubricated seals protect the track link and deliver long track pin and bushing inner wear life.Capsule Filter
The hydraulic return filter, a capsule filter, is situated outside the hydraulic tank. This filter prevents contaminants from entering the system when hydraulic oil is changed and keeps the operation clean.Fan Guard
Engine radiator fan is completely enclosed by fine wire mesh, reducing the risk of an accident.Anti-Skid Plate
Anti-skid plate covers top of storage box and upper structure to prevent slipping during maintenance.Diagnostics and Montoring
The 320D FM is equipped with S•O•SSM sampling ports and hydraulic test ports for the hydraulic system, engine oil, and for coolant. A test connection for the Cat Electronic Technician (Cat ET) service tool is located in the cab.Extended Service Interval
320D FM service and maintenance intervals have been extended to reduce machine service time and increase machine availability.
You will find nearly all parts at our dealer parts counter. Cat dealers utilize a worldwide computer network to find in-stock parts to minimize machine down time. Save money with remanufactured components.Machine Selection
Make detailed comparisons of the machines you are considering before you buy. What are the job requirements, machine attachments and operating hours? What production is needed? Your Cat dealer can provide recommendations.Customer Support Agreements
Cat dealers offer a variety of product support agreements, and work with customers to develop a plan the best meets specific needs. These plans can cover the entire machine, including attachments, to help protect the customer's investment.Operation
Improving operating techniques can boost your profits. Your Cat dealer has videotapes, literature and other ideas to help you increase productivity, and Caterpillar offers certified operator training classes to help maximize the return on your investment.Maintenance Services
Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling, Coolant Sampling and Technical Analysis help you avoid unscheduled repairs. Replacement. Repair, rebuild, or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.