325D FM Forest Machine

325D FM Forest Machine

The D Series incorporates innovations for improved performance, rugged durability and maximum productivity.

Download Product Documents

Click a link to download the document:

Power Train

The Cat® C7 has exceptional power and fuel efficiency unmatched in the industry for consistently high performance in both forestry and millyard applications.


The Cat® C7 with ACERT™ Technology gives the 325D FM exceptional power and fuel efficiency unmatched in the industry, and provides high performance in all forestry applications. The C7 meets U.S. EPA emissions requirements.


The 325D FM provides 12% more horsepower as compared to the previous 3126B ATAAC HEUI 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 C7 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. A standard programmable reversible fan allows for radiator blowout, to increase service intervals and to maintain engine operational temperatures. The optimum fan blade pitch is calculated based on the target engine speed, coolant temperature and hydraulic oil temperature. The Cat C7 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.


An optional air cleaner Prefilter is available for the 325D FM. This Prefilter reduces debris ingestion into air cleaner filters, reducing plugging and extending air filter service intervals.

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.


Cat® hydraulics provide the power and control needed for a variety of applications.

Component Layout

The 325D 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 provides pilot oil to control all the front linkage, swing and travel valve functions.

Hydraulic Cross Sensing System

The hydraulic cross sensing system improves productivity with faster implement speeds and quicker, stronger pump response.

Boom and Stick Regeneration Circuit

Boom and stick regeneration circuits save 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.


The hydraulic system offers precise control to the 325D 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 325D 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.

Operator Comfort

The purpose built forestry cab interior layout maximizes operator space, provides exceptional comfort, provides excellent sightlines and reduces operator fatigue.

Operator Station

The workstation is spacious, quiet and comfortable, assuring high productivity during a long work day. Controls, joysticks and an ergonomically designed seat are strategically placed to reduce operator fatigue.

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.

Climate Control

Positive filtered ventilation, a pressurized cab with bi-level air conditioner, heater and defroster keep operator comfortable in all types of weather conditions. The cab also features a forced air fan and a large fresh air window.


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 in 27 different languages.

Gauge 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 both 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.


An air ride 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 use 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.


Consoles feature a simple, functional design to reduce operator fatigue, ease of switch operation and excellent visibility.


An enlarged skylight with sunshade provides excellent upwards visibility.

Escape Hatch

Escape hatch in cab roof allows exit from the cab, or access from outside the cab in case of an emergency.


Cab design optimizes post structures, and scratchresistant polycarbonate window placement to provide excellent operator visibility to front, sides and rear. Windshield wipers are standard equipment on the FM cab.

Rear Entry Cab

Upper frame design accommodates a variety of AEM rear entry cab installations where a larger cab and rear entry access are required.


Purpose-built forest applications with reinforced carbody, rugged swing bearing, heavy doors and extra guarding.

Rugged main frame design maximizes durability

  • Outer frame utilizes curved side rails, which are di-formed for excellent uniformity and strength.
  • ROPS certified 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 heavy-duty, high-tensile strength plate.
  • Swing drive area is reinforced into the main frame rails supporting high stress loads such as those encountered in shovel logging applications.
  • Boom foot and engine mount areas have multiple reinforcements for additional strength.
  • Sheet metal supporting structure is improved by integrating the mounting into the upper frame structure.

Carbody Design

Advanced, reinforced, purpose-built carbody design stands up in the toughest forest applications. High Wide design provides maximum ground clearance for maneuvering large obstacles.

Carbody Structure

Heavy-duty purpose built 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 carbody-to-roller frame junctions for excellent durability.
  • Robot welding helps ensure consistent, high-quality welds throughout the manufacturing process.


Cat guarding protects your forestry machine investment.

Shoe Support Guards

Standard full length track shoe support guards help protect rollers and provide increased rigidity to track links in rough underfoot conditions.

Stick Cylinder Guard

Optional HD stick cylinder guard provides protection from trees and debris for hydraulic lines, fittings and cylinder components.

Factory Forestry Cab

Caterpillar designed cabs use certified ROPS/FOPS structures, impact resistant polycarbonate windows and HD window guards.

Right Front Corner Guard

New improved right front corner guard has added tree deflector arm providing increased protection to machine from debris and falling trees or limbs. Arm is rotatable to allow transport position.

Heavy-Duty Access Doors

Heavy-duty access doors are standard on the 325D 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.


Heavy-duty track roller, final drive and hydraulic swivel guarding keep debris out, and protect components for increased uptime.


Durable undercarriage absorbs stresses and provides strong travel power and excellent stability.

Heavy-Duty Top Rollers

Track rollers with dual supports replace standard single post mounted carrier rollers to assure superior endurance.

Heavy-Duty Track Rollers

Nine heavy-duty track rollers per side 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 325D FM undercarriage has been up sized to 349 HE, GLT4 Track Link with 216 mm (8.5 inch) pitch components as standard equipment. Larger undercarriage components provide extended service life and reduced operating costs.

1) Grease Lubricated Track

  • Extends internal bushing wear life
  • Reduces noise
  • Provides more usable horsepower because of decreased internal friction
  • Reduces chance for frozen track joints

2) Greased Pin and Larger Bushing Combined

  • Extends system life
  • Reduces sprocket wear because the system stays matched longer
  • Improves balance in component wear life

Final Drives

New larger GFT80 final drives provide a 19% increase in drawbar improving machine climbing ability and increasing productivity even in the toughest logging applications.


A wide selection of Forest Machine configurations meet diverse forestry applications and improve your productivity.

The Cat Log Loader is “Purpose Built” for Forest Applications

Completely assembled, heel-type log loader linkage (including grapple) are available from the factory. These are well suited to loading, shovel logging and millyard applications.

Cat Roadbuilders

The General Forestry model can be equipped with buckets, thumbs, clamshells and clearing grapples to fit a wide range of forest road building 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 325D FM can be shipped from the factory with an optional hydraulic arrangement and controls for AEM Butt-N-Top grapple installation, and an 11.3 m (37 ft) front.

Less-Off Cab

A version of the 325D FM Log Loader is available less-off the cab to allow various AEM cabs to be installed by the dealer to meet regional customer needs.

Cat Grapples, SATCO Heads

Cat Forest Machines combined with Cat Log Loading Grapples mean optimal performance, reliability and on-the-job productivity.

Cat GLL 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 1524 mm (60 inch) GLL60B, while int erlocking legs close down to 127 mm (5 inch) for picking and sorting. Cat grapples have bolt -on access panels allowing for easy serviceability and are backed by the world-class Cat dealer network.

SATCO Harvester Heads

SATCO heads are field proven in roadside processing or in-the-woods harvesting applications around the world. Design utilizes large pins, bearings and structures for long life and lower mainte nance costs. These heads, matched with strong Forest Machine HP and hydraulics provide optimum harvesting or processing performance, and maximum uptime.

Owning and Operating Costs

Cat Forest Machines provide the best value for your forestry and millyard applications.

ACERT™ Technology Fuel Economy

Based on Caterpillar testing, the fuel economy of Cat engines with ACERT technology is up to 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.

Air Filter

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 screens assembled on the door keep debris away from the radiator compartment, extending service intervals.

Product Link™

Product Link is standard equipment and factory installed. Product Link helps you keep track of hours worked, fuel consumption, location, fault codes, product health, and managing operating costs and productivity.


Easy to access, easy to maintain.

Ground Level Service

The design and layout of the 325D 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 pumps and pilot filter.

Radiator Compartment

The left rear service door allows easy access to the engine radiator, oil cooler and air-to-air aftercooler. 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. The use of next size larger undercarriage components maximizes service 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

New improved anti-skid material increases grip in wet, icy or muddy conditions. Anti-skid plate covers top of storage box and upper structure to prevent slipping during maintenance.

Cab Tilt

A hydraulic tilting cab and riser provide easy service access beneath cab. Cab can be left in tilted position to make transport easier.

Customer Focus

Cat dealer services help you operate longer with lower costs.

Product Support

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.


Improving operating techniques can boost your profits. Your Cat dealer has videotapes, literature and other ideas to help you increase productivity, and Caterpillar offers 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.


Engine Model
Cat® C7 ACERT™
Net Flywheel Power
ISO 9249
SAE J1349


General Forestry (HW)
Log Loader (U/U)
Log Loader (O/U)

Swing Mechanism

Swing Torque - General Forestry
63664.0lb ft
Swing Speed - General Forestry

Service Refill Capacities

Fuel Tank
Fuel Tank - Optional Auxiliary Right Front
Optional Counterweight with Fuel Tank
Maximum Fuel with all Optional Tanks
Cooling System
Engine Oil
Swing Drive
Hydraulic System (including tank)
Hydraulic Tank
Final Drive (each)


SAE J1026 APR90
SAE J1356 FEB88 SAE J1084/ISO 8084/ROPS: ISO 8082-2 OR-OSHA 437-007-0775/WCB G602, G603, G604, G608
ISO 3449:2005 (LEVEL II), ISO 8083:2006

Hydraulic System

Main Implement System - Maximum Flow (2x)
Max. pressure - Travel
Max. pressure - Swing
Pilot System - Maximum Flow
Pilot System - Maximum Pressure
Boom Cylinder - Bore
Boom Cylinder - Stroke
Stick Cylinder - Bore
Stick Cylinder - Stroke
Max. pressure - Implements

Excavator Linkage

CB2 Family Bucket Cylinder - Bore
CB2 Family Bucket Cylinder - Stroke

Log Loader Linkage

Boom Cylinder - Bore
Boom Cylinder - Stroke
Stick Cylinder - Bore
Stick Cylinder - Stroke
Under/Under Heel Cylinder - Bore
Under/Under Heel Cylinder - Stroke
Over/Under Heel Cylinder - Bore
Over/Under Heel Cylinder - Stroke


Maximum Drawbar Pull
Rabbit Travel Speed
Turtle Travel Speed

Standard Equipment

  • Electrical
    • 80 Ampere alternator
    • 4 Front working lights, cab top mounted
    • 2 Front working lights, RF corner guard
    • 2 Front working lights, riser mounted
    • 2 Front working lights, stick/boom mounted
    • 1 Left side working light, cab mounted
    • 1 Rear working light, cab mounted
    • Horn
    • Product Link (PL 321 SR)
  • Operator Environment
    • Purpose built forestry cab with 8 lights and all scratch resistant polycarbonate windows
    • Air suspension seat with adjustable armrest, retractable seatbelt, headrest and lumbar support
    • Integrated seat, console and joystick type controls
    • Language display monitor with gauges
    • Warning information Filter/fluid change information Working hour information Machine condition Error code and tool mode setting information Start up level check for hydraulic oil, engine oil and engine coolant
    • Full time clock on monitor (2 weeks)
    • Seat mounted joystick with extra functions for grapple
    • Fixed polycarbonate skylight with retractable sun shade
    • Interior lighting
    • Lower and upper windshield wipers and washer
    • Positive filtered ventilation, pressurized cab with bi-level air conditioner, heater and defroster with manual control
    • Forced air fan
    • Left side fresh air window with screen
    • Behind seat storage tray with tie down points
    • 1 Fire extinguisher mount
    • Secondary roof exit openable from inside and outside
    • 2 Coat hooks
    • Literature holder
    • Cup holder
    • Neutral lever for all controls
    • Travel control pedals with removable hand levers
    • Washable floor mat
    • Radio/CD player (12V)
    • 1 Converter/2 sockets - 12V-10A power supply
  • Power Train
    • Cat C7 with ACERT Technology U.S. EPA emissions compliant with 24-volt electric starting and air intake heater
    • Automatic engine speed control with one touch low idle
    • Two speed auto-shift travel
    • Water separator in fuel line
    • Easy clean swing out radiator door screen
    • Muffler
  • Undercarriage
    • Hydraulic track adjusters
    • 349 HE GLT4 undercarriage with grease lubricated seals
    • Idler and full-length track shoe support
  • Other Standard Equipment
    • Heavy-duty upper frame with catwalks, bottom guards, heavy duty side doors
    • Core hydraulic lines and controls with standard main valves on upper structures
    • Door locks, cap locks and Cat one key security system
    • Automatic swing parking brake
    • Travel alarm
    • Counterweight with lifting eye
    • Right front corner guard with tree deflector
  • 325d Fm General Forestry Arrangement Also Includes:
    • Forestry cab, hydraulic tilt 0.46 m (18 inch) riser
    • High-wide undercarriage
    • High drawbar
    • Heavy-Duty recoil springs
    • Heavy-Duty track roller frame
    • Heavy-Duty travel motor covers
    • Heavy-Duty swivel guard
    • Forestry Heavy-Duty upper frame with catwalk
    • Heavy-Duty bottom guard
    • Heavy-Duty side doors
    • Right front corner guard
    • Travel alarm and full length shoe support
  • 325d Fm Log Loader Arrangement Also Includes:
    • Forestry cab, side entry
    • Hydraulic tilt 1.2 m (48 inch) riser
    • High-wide undercarriage
    • High drawbar
    • Heavy-Duty recoil springs
    • Heavy-Duty track roller frame
    • Heavy-Duty travel motor covers
    • Grapple/rotator hydraulic arrangement
    • Heavy-Duty swivel guard
    • Forestry Heavy-Duty upper frame with catwalk
    • Heavy-Duty bottom guard
    • Heavy-Duty side doors
    • Right front corner guard with tree deflector
    • Travel alarm and full length shoe support
    • Auxiliary hydraulic pump
  • 325d Fm Log Loader Arrangement For Aem Cab Also Includes:
    • AEM cab platform (no cab)
    • High-wide undercarriage
    • High drawbar
    • Heavy-Duty recoil springs
    • Heavy-Duty track roller frame
    • Heavy-Duty travel motor covers
    • Grapple/rotator hydraulic arrangement
    • Heavy-Duty swivel guard
    • Forestry Heavy-Duty upper frame with catwalk
    • Heavy-Duty bottom guard
    • Heavy-Duty side doors
    • Right front corner guard with tree deflector
    • Travel alarm
    • Full length shoe support
    • Counterweight with fuel tank
    • Right front corner fuel tank
    • Auxiliary hydraulic pump

Optional Equipment

  • Front Linkage: For General Forestry
    • Reach Boom 6.2 m (20 ft 2 in)
    • Reach Stick 3.2 m (10 ft 6 in)
    • Mass Boom 5.5 m (18 ft 2 in)
    • Mass Stick 3.2 m (10 ft 6 in)
    • Bucket Linkage CB2 Family
  • Front Linkage: For Log Loader
    • Over/Under Boom/Stick/Heel Linkage 12.8 m (42 ft 0 in)
    • Under/Under Boom/Stick/Heel Linkage 12.2 m (40 ft 0 in)
    • Butt-n-Top Boom/Stick Linkage 11.3 m (37 ft 0 in)
    • Stick Cylinder Guard
  • Hydraulic Arrangements: For General Forestry
    • Rotating Grapple
    • Butt-n-Top Grapple (also available on Log Loader)
    • Thumb
  • Auxiliary Hydraulic Lines: For General Forestry
    • Auxiliary Lines High Pressure (HP) and Medium Pressure (MP), Reach and Mass Boom
    • Auxiliary Lines High Pressure (HP) and Medium Pressure (MP) Reach and Mass Stick
  • Engine/power Train
    • Prefilter, air
    • Cold Weather Starting Aid
    • Extended Life Cooling with 50% concentration of protection -34° C (-30º F)
  • Undercarriage (track Shoes)
    • 700 mm (28 in) Double Grouser Shoes with Trap Holes
    • 850 mm (34 in) Heavy-Duty Triple Grouser Shoes with Trap Holes
  • General Optional Equipment
    • Auxiliary Pump Driver (for additional pump) for General Forestry (standard on log loader)
    • Right Front Corner Fuel Tank (additional 409 L - 108 gal)
    • Counterweight with Fuel Tank Adds (492 L - 130 gal)
    • Heavy Counterweight (additional 2960 kg - 4,620 lb). For General Forestry (Standard on Log Loader).
    • GLL Family Grapples for Log Loader
    • AEM Cab Installation Kit for Log Loader AEM Cab