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| Four-plate loader tower | Four-plate loader tower resists shocks and loading stresses. |
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| 3046T Engine | Smooth, responsive power, excellent fuel economy and lasting reliability. | 
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| Overview | Offering rugged construction and outstanding reliability to allow you to maximize productivity. | 
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| Outmaneuver Every Job You Tackle | A single lever joystick control is all that is needed to control speed, direction and steering on Cat 939C Hystat Track-type Loaders. |
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| Power Train | Quick response and acceleration plus better maneuverability decrease cycle times
and increase productivity. |
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| Hystat Power Train System | Quick response and acceleration plus better maneuverability decrease cycle times and increase productivity.
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| Hystat Power Train System | |
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| Hystat Power Train System | |
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| Caterpillar 3046 Diesel Engine | Smooth, responsive power, excellent fuel economy and lasting reliability.
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| Turbocharger | The turbocharger, used on the 3046T versions, is a small, low inertia design for improved response and improved performance at lower engine speeds.
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| Fuel Capacity | Fuel capacity on the 939C fuel tank remains the same. |
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| Implement System | The 939C Hystat machines use a manually controlled open-center system. The
implement system shares a common oil sump and filtration system with the
Hystat power train. |
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| Hydraulic Tank | The hydraulic tank is a welded design. The tank supplies oil to both the
Hystat drive and the implement system.
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| Hydraulic System | Improved for increased productivity |
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| Hystat Control | Steering, machine direction and speed are combined into one control for enhanced operator controllability, comfort and increased productivity.
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| Track Motors | The high pressure motors are 2-speed type (turtle/rabbit). The Hystat motors convert hydraulic power to mechanical
power.
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| Hydraulic Lines | Hydraulic Lines XT-6 hose is used to connect pumps and motors. O-ring face
seals ensure tight and reliable connections throughout the Hystat
system.
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| Power Train Oil | One filter is located in the charge pump outlet from each of the hystat pumps.
This location assures that all oil is filtered before entering the piston rotating group portion of the hystat
circuit. |
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| Final Drives | The Hystat final drive is a double-reduction unit, similar in design to that of the current hydrostatic
track loaders. |
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| Cooling System | The cooling package is a stacked configuration, with the configuration of fan - oil cooler - radiator. The blower fan forces cooling air first through the oil cooler then through the radiator.
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| Drive Pumps | The pumps are over-center style, providing forward and reverse directions by changing the direction of flow from the pumps, and are controlled by a
hydraulic pilot control system (joystick). |
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| Parking Brakes | The parking brakes are a multi-disc design. These parking brakes are spring
applied and hydraulically released.
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| Hydraulic System | - 50 percent increased pump flow provides faster cycle times, resulting in more work done per hour
- Larger lift cylinders deliver 26 percent more lift force for tough loading applications
- Improved bucket control provides multi-function capabilities for fast truck loading and spreading applications
- Reduced bucket control lever efforts provide lower operator fatigue
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| Joystick Control | The joystick control is simple and easy to understand. With it, you will control the direction, speed, and steering of your 939C Hystat track loader. The joystick is ergonomically designed to fit comfortably in the palm of your hand. Control effort is minimal, so much so that you might find yourself using your fingertips. |
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| Direction/speed | Machine direction and speed are easy to handle with the four easy movements on the joystick.
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| Steering | With the machine moving in forward or reverse, moving the joystick to the
right results in the machine turning to the right; moving the joystick to the left causes the machine to move to the left. | 
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| Operator Station | Ergonomically designed for your maximum comfort and productivity. | 
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| Canopy | Take the opportunity to work comfort-ably and productively, day-in and day-out. Whether you equip your loader with an open canopy or an optional cab, you’ll find thoughtfully positioned controls and a variety of other convenience features. |
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| Track shoes | Track shoes are made from heat-treated steel for strength and durability. |
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| Idlers | Heat treated idlers are sealed and lubricated to provide long life. |
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| Ground level sight gauge | Ground level sight gauge allows easy check of hydraulic oil level. |
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| Ease of Operation | All major machine work functions can be
accomplished with just two hands. | 
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| Reduced Operator Fatigue | Low control lever efforts help increase operator productivity each day. Day after day.
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| Hystat joystick control | Hystat joystick control gives you the power to control steering, direction and speed all with your left hand. Easily switch from turtle/rabbit mode with the toggle switch located on top of the joystick. Activate the horn by pressing the button beneath the turtle/rabbit toggle switch. |
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| Joystick hold control | Joystick hold control holds the joystick in any forward/reverse position, freeing the operator’s left hand. |
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| Hystat center pedal | Hystat center pedal may be used to either slow down or stop the machine. Adjustable foot rests provide a great place for your feet to relax while working. |
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| Single lever lift and tilt control | Single lever lift and tilt control improves efficiency. Needle bearings on all major pivot points and valve spools with precision metering help ensure precise, lasting control. |
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| Governor control | High to low setting allows you to set engine speed at the desired RPM. Hystat loaders can be operated at any RPM. |
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| Dash panel | Dash panel has five individual, analog gauges, providing fluid level and temperature information at a glance. All gauges are back-lighted. |
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| A suspension seat | A suspension seat is standard on all 939C track loaders and is equipped with a seat belt and an adjustable backrest. |
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| Bolt-on Corner Guard System | Bolt-on Corner Guard System protects the edges for long term wear. |
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| Backdrag edge | Backdrag edge adds grading capability to extend machine versatility. |
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| Replaceable bottom plates | Replaceable bottom plates increase the buckets’ service life. |
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| High bucket rackback angle | High bucket rackback angle retains material for increased efficiency. |
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| Armrests are adjustable | Armrests are adjustable fore and aft, as well as up and down to best suit your preferred operating position. |
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| Vandalism protection guarding | Vandalism protection guarding on canopy models folds down under the dash for storage, and is raised over the dash and padlocked when needed. |
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| Cab | The pressurized cab is sealed to keep dust out and sound to a minimum, resulting in a quiet working environment. Nine adjustable vents keep air circulating and improve the cab’s heating, optional air conditioning, and defrost/defog capabilities. |
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| Tinted windows | Tinted windows. A continuous, three-piece glass windshield and a large, single-piece door glass provide excellent visibility to the work site. Large, sliding right and rear side windows provide excellent flow-through ventilation. |
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| Control Console | Control console is back-lighted and contains controls for cab temperature, fan speed, the front/rear window
washers, and two-speed wipers. A cigarette lighter and ashtray are also
included.
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| Other cab conveniences include: | - Radio ready factory installed components, including speakers, an antenna, and all wiring/brackets
- Tie-downs for secure lunch box storage
- Sunvisor
- Rearview mirror
- Dome light
- Coat hook
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| Center Brake Pedal | The center brake pedal is located towards the floor of the operator's
compartment (cab and OROPS) and can be used to stop the machine by pressing the pedal all the way down.
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| An optional Caterpillar Contour Series Seat | An optional Caterpillar Contour Series seat, with a retractable seat belt, is the premium seat option and is designed for maximum comfort and fully-adjustable support. Ergonomically shaped seat cushions reduce pressure on the lower back and thighs, while allowing unrestricted arm and leg movement. Contour Series seats are available in cloth for use in cab, or vinyl when used in open canopy. | 
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| Footrests | Since Hystat track loaders are not steered with foot pedals, two footrests, one on each side of the center brake pedal, are provided for enhanced operator comfort. Footrests are also
adjustable.
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| Bucket Control | A single lever control handle is used to control the bucket. The control lever operates on two axis: fore/aft for bucket lift, side to side for bucket tilt. |
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| Bucket and Lift Arms | Designed and built for unmatched versatility, durability, and strength. | 
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| Buckets | Rugged construction along with powerful, matched hydraulics provide excellent breakout force and lift capacities for maximum production capabilities and load handling. | 
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| General-purpose bucket | Designed for excavating, loading and general purpose work. Wide, large capacity means excellent track coverage and increased production potential. |
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| Multi-purpose bucket | Designed for excavating, loading, stripping and cleaning up debris. Provides maximum versatility and strength to handle the toughest jobs. |
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| Bolt-on cutting edge | Bolt-on cutting edge segments are reversible and extend the wear life of the bucket. |
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| Solid-plate lift arms | Solid-plate lift arms provide strength and durability for excellent lift and breakout capacities. |
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| Sealed loader linkage | Sealed loader linkage increases all linkage lube points to 50 Service Meter Hours. |
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| XT-3™ hoses | XT-3™ hoses meet critical strength and flexibility demands for increased reliability. |
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| Cylinders | Large diameter hydraulic cylinders provide powerful force. Precision finished rods for minimal seal wear. |
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| Arms | Solid-plate lift arms provide strength and durability for excellent lift and breakout capacities.
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| Undercarriage | Components designed to provide you with maximum performance and wear life. | 
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| Undercarriage is designed and built by Caterpillar for long wear life and low owning and operating costs. |
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| Standard undercarriage | - A general purpose undercarriage that performs well in applications with firm underfoot conditions.
- Standard shoe width: 406 mm (16 in) double grouser.
Optional shoe width: 460 mm (18 in) double grouser. |
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| Full length recoil guarding | Full length recoil guarding with sprocket guards and wipers assists in reducing material buildup and helps prevent material from entering the undercarriage system for maximum component wear life. |
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| Front and rear track guiding guards | Front and rear track guiding guards provide additional protection from abrasive material. Rear guards are a bolt-on design making installation and removal easy. |
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| Segmented sprocket | Segmented sprocket allows replace-ment of sprocket teeth without splitting the track, reducing downtime and lowering maintenance costs. |
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| Split master link | Split master link features strong, serrated two half links for easy track removal. No driving pin is needed. |
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| Sealed and Lubricated Track | Sealed and Lubricated Track eliminates internal pin and bushing wear for longer wear life. Strong, strutted links provide increased strength and service life. |
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| Box-section track roller frame | Box-section track roller frame provides maximum structural integrity for increased roller frame alignment, and reduces relative motion. |
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| Track rollers | Sealed and lubricated rollers eliminate internal wear for longer service life. Sequenced single and double flange rollers provide superior track link alignment. |
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| Removable engine enclosure | Removable engine enclosure has a built-in grip handle and provides access to vertically mounted, spin-on engine oil and fuel filters, S•O•SSM valve, and fuel priming pump. |
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| Engine oil dipstick, oil fill and radiator fill is | Engine oil dipstick, oil fill and radiator fill is easily accessed through a hinged and lockable panel on top of the hood. |
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| Updated Rear Track | The new guarding prevents material ingestion into the sprocket and rear roller area. The result is the
introduction of bolt-on rear guiding guards which enhance rear guiding due to increased length over current rear guiding guards.
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| Updated Recoil Guards | The recoil guards protect the recoil mechanism from impact damage and reduce
the amount of abrasives entering critical wear areas.
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| Double Flange Bottom Rollers | The double flange bottom roller group serves the same function as the single flange group, but it is designed with an
additional outboard flange to increase its guiding ability.
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| Track | The track group serves to transfer power from the final drive to the ground through the use of links, bushings, pins, and shoes.
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| Optional Full Length Track Roller Guards | In order to increase the protection of the roller wear surfaces from abrasives
and rocks, full length track roller guards are offered as an attachment for all undercarriage configurations.
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| Serviceability | More access and fewer maintenance requirements add up to unparalleled
ease of service.
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| Zerk lube fitting | Zerk lube fittings allow easy lubrication of the loader linkage pivot pins to provide long life and maintain tight linkage. |
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| Combined power train and hydraulic oil | Combined power train and hydraulic oil filters are vertically mounted for cleaner changes and are easily accessible by removing the rear panel. An S•O•S valve is conveniently installed on the filter base for sampling power train oil. |
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| Fuel/water separator | Fuel/water separator is accessed easily through a hinged door located at the rear of the machine. |
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| New Engine Enclosure Panel | The 939C loaders are built with an updated enclosure panel which incorporates a built-in grip handle for easy removal and access to the vertically mounted, spin-on engine and oil fuel filters, SOS valve, and fuel
priming pump.
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| Filters & Change Intervals | The combined power train and implement hydraulic system uses two 7 micron
spin-on type filters located inside the rear access door for easy accessibility.
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| Fluid Check Points | The engine oil dipstick, engine oil fill cap, and radiator cap are located
inside the access door on top of the hood. |
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| Fluid Drain Locations | The engine crankcase drain plug and the radiator drain valve are accessible
underneath the machine by removing the access covers from the bottom guards.
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| Grease Points | The loader lift, tilt cylinders contain grease zerks on both ends of the cylinder pivot pins.
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| Total Customer Support | When you purchase Cat equipment, you also get Caterpillar and your Cat dealer’s total commitment to customer support. | 
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| Your Cat dealer offers a wide range of services that can be set up under a customer support agreement when you acquire a 939C Hystat loader or any other Caterpillar equipment. The dealer will help you choose a plan that can cover everything from machine and attachment selection to replacement intervals. The bottom line is you get the best return on your machine investment. |
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| Selection | Your Cat dealer can help you make detailed comparisons of machines you are considering before you buy. You can compare things like expected component life, the cost of preventive maintenance and the true cost of lost production. You can get precise answers to these questions from your Cat dealer. |
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| Easy financing | Consider all the flexible financing options your Cat dealer offers as well as day-to-day operating costs. Whether it’s rental, leasing, or purchase, your Cat dealer can meet your needs. |
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| Maintenance | Choose from your Cat dealer’s wide range of maintenance services at the time you acquire your 939C Hystat loader. Repair option programs guarantee the cost of repairs up-front. Diagnostic programs such as S•O•SSM Oil Analysis and Technical Analysis help you avoid unscheduled repairs that can cost you unnecessary time and money. |
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| A Customer Support Agreement | A Customer Support Agreement can enhance the value of your 939C Hystat loader by lowering your costs per unit of production and puts your Cat dealer’s superior support capabilities to work for you. They are flexible and customized to your individual needs, whether for a single machine or a whole fleet. Ask your Cat dealer for details. |
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| Product support | Nearly all the parts needed to support the 939C Hystat loader are already available at your dealer’s parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize downtime. |
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| Replacement | Throughout the life of your 939C Hystat, your Cat dealer can help you evaluate the cost involved with repairing, rebuilding or replacing. You can be assured that the choice you make will be the right one. |
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| Complete Versatility | From the beginning of a job to the finish grading, the 939C Hystat Track-Type Loader is a versatile tool. | 
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| One machine for all jobs! | Some of the first steps on any job can be accomplished easily with the help of the 939C, beginning with clearing the job site by loading and carrying debris, as shown above. Excavating and carrying/spreading material, above right, are also crucial elements to any job. The 939C is the perfect tool to perform them. Rounding out the job, below right, the 939C greatly facilitates trash cleanup, loading, and finish grading work. |
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| Your Cat Dealer | There is one very important component included with every Caterpillar 939C Hystat Track-Type Loader that no one else can offer: your Cat dealer.
Whether you have questions about performance, service or financing, your Cat dealer has the answers. He is dedicated to helping you make the right equipment choice for your requirements.
Plus, your Cat dealer has most parts you will ever need for your Cat equipment right on the shelf. If not, the dealer’s worldwide computerized network will immediatel | 
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