844 Wheel Dozer



Technical Specifications
Benefits and Features
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Cat Wheel Dozers are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to move more material efficiently and safely at a lower cost per ton. Engineered for your demanding work in large dozing applications, the 844 Wheel Dozer is the largest in the Cat Wheel Dozer line and is an ideal match for large mining operations, power generating utilities, the general contracting industry and wherever mobility, versatility and compaction is needed.

Engine Model C27 Cat®
Rated Speed 1800 r/min
Gross Power - ISO 14396 752 HP
Gross Power - SAE J1995 766 HP
Net Power - SAE J1349 - Standard Ambient 699 HP
Net Power - SAE J1349 - High Ambient 648 HP
Bore 5.4 in
Stroke 6 in
Displacement 1649.5 in³
Peak Torque - Speed 2624 lb/ft
Torque Rise 18 %
Emissions U.S. EPA Tier 4 Final and EU Stage V or China Nonroad Stage III Emissions standards, equivalent to U.S. EPA Tier 2
Operating Specifications
Operating Weight 165089 lb
Blade Capacities 15.9 - 30.7 m3 (20.7 - 40.2 yd3)
Transmission Type Cat Planetary Power Shift
Converter Drive - Forward 1 4.5 mile/h
Converter Drive - Forward 2 8.3 mile/h
Converter Drive - Forward 3 14.2 mile/h
Converter Drive - Reverse 1 4.9 mile/h
Converter Drive - Reverse 2 9.1 mile/h
Converter Drive - Reverse 3 15.5 mile/h
Direct Drive - Forward 1 Lock-up disabled
Direct Drive - Forward 2 8.5 mile/h
Direct Drive - Forward 3 15.2 mile/h
Direct Drive - Reverse 1 5.4 mile/h
Direct Drive - Reverse 2 9.6 mile/h
Direct Drive - Reverse 3 16.4 mile/h
Hydraulic System - Lift/Tilt
Output at 2,000 rpm and 6900 kPa (1,000 psi) 82 gal/min
Cylinders, Double Acting - Lift, Bore and Stroke 133 mm × 1535 mm (5.25 in × 60.4 in)
Cylinder, Double Acting - Tilt and Tip, Bore and Stroke 210 mm × 188 mm (8.25 in × 7.4 in)
Relief Valve Setting - Bulldozer (Large Pump) 2700 psi
Relief Valve Setting - Tilt Cylinders (Small Pump) 2920 psi
Hydraulic System - Steering
Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement
Minimum Turning Radius - Over Blade 34 ft
Total Steering Angle 35 °
Maximum Flow 94.3 gal/min
Relief Valve Setting 4500 psi
Service Refill Capacities
Fuel Tank - Standard 286.6 gal (US)
Cooling System 54.9 gal (US)
Crankcase 20 gal (US)
Transmission 29.1 gal (US)
Differential - Final Drives - Front 71.6 gal (US)
Differential - Final Drives - Rear 68.9 gal (US)
Hydraulic System - Implement and Hydraulic Fan 68.9 gal (US)
Hydraulic System - Steering and Braking 34.9 gal (US)
Air Conditioning System
Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.
Front Fixed
Rear Trunnion
Oscillation Angle 8.5 °
Brakes Meets ISO 3540:2011
Sound Performance - Standard
Operator Sound Level (ISO 6396:2008) 69 dB(A)
Machine Sound Level (ISO 6395:2008) 115 dB(A)
Sound Performance - Suppression
Operator Sound Level (ISO 6396:2008) 69 dB(A)
Machine Sound Level (ISO 6395:2008) 113 dB(A)
ROPS/FOPS ISO 3471:2008 and ISO 3449:2005 Level II Standards
Dimensions (Approximate)
Height - Top of ROPS 17.2 ft
Height - Top of Exhaust Pipe 16.6 ft
Height - Top of Hood 12.7 ft
Ground Clearance 2 ft
Centerline of Front Axle to Hitch 7.5 ft
Centerline of Rear Axle to Edge of Bumper 12.5 ft
Wheel Base 15.1 ft
Length - With Blade on Ground 36.5 ft

Long Term Value and Durability

Unmatched Durability


  • The full box-section rear frame resists torsional shock and twisting forces.

  • Solid through-width push beams transfer and absorb stresses through a larger portion of the frame.

  • Robust structures withstand the toughest conditions and multiple lifecycles to improve your bottom line.

  • Resilient, durable blades are designed with excellent dozing and rolling characteristics.

  • Optimized axle mounting results in increased structural integrity.

  • Castings in the engine and frame are used in high stress areas to spread high loads.

  • One-piece castings enhance strength in key pin areas.

Move More with Less Fuel

Optimum Efficiency


  • Experience reliable efficiency with complete control over injection timing, duration, and pressure with Mechanically Actuated Electronic Unit Injection (MEUI™).

  • Best-in-class Cat planetary powershift transmission features consistent, smooth shifting and efficiency through integrated electronic controls.

  • Extended engine life and improved fuel efficiency with reduced rated speed.

  • Impeller Clutch Torque Converter (ICTC) and Rimpull Control System (RCS) provide precise rimpull control.

  • Load sensing hydraulic steering system enables precise machine control for easier loading.

  • Lock-up torque converter with advanced control of lock-up speed.

  • On demand cooling fan protects investment and lengthens lifecycle.

Safety First

Increased Safety


  • Battery disconnect, emergency engine shutdown, and stairway light switch are accessed through the ground level power service center.

  • Optional Cat Detect with Object Detection System (rearview camera and radar) or Vision (rearview camera) increase operator awareness around the machine.

  • Cab-mounted LED strobes provide warning for others near the machine.

  • Wider stairs with reduced stair angles increase safety for operators.

  • Access stairs via a powered platform from cab or ground level and have emergency egress access.

Technology that Gets Work Done

Innovative Technology


  • Integrated technologies allow you to monitor, manage, and enhance your jobsite operations.

  • Product Link™ remote monitoring provides valuable insight into machine or fleet performance through the VisionLink® interface, so you can make decisions that boost jobsite efficiency and lower operating costs.

  • Vital Information Management System (VIMS™) 3G touchscreen monitor gives access to a wide range of sensor information and enhanced machine data to resolve problems before machine failure.

  • Optional Cat Detect technologies enhance awareness of the environment around the machine for increased safety.

Work In Comfort

Enhanced Operator Comfort


  • Steering and Transmission Integrated Control System (STIC™) combines directional selection, gear selection, and steering into a single lever, maximizing responsiveness and control while reducing operator fatigue.

  • Operators can easily enter and exit the cab with fold-up STIC steer/armrest, reduced access stairway angles, and standard stairway lighting.

  • Experience reduced vibrations with isolated cab mounts and seat-mounted implement and steering controls.

  • Reduced interior sound levels keep operators comfortable throughout their entire shift.

Reduce Environmental Impact

Improved Sustainability


  • Meets U.S. EPA Tier 4 Final emissions standards.

  • Emits up to 18% less Co2 /hr.*

  • Automatic Engine Idle Shutdown conserves fuel when machine is not in use.

  • Generate less waste with maintenance-free batteries.

  • Maximize machine life and lower operating costs with Caterpillar Reman and Certified Rebuild programs, which utilize reused or remanufactured components for 40 to 70 percent cost savings.

  • Retrofit packages from Caterpillar deliver new features to older machines to get the most from your investment.

Save on Service and Maintenance

Simplified Maintenance


  • Swing-out fuel, hydraulic oil coolers, and condenser allow for easy access cleanout.

  • Machine features ground level or platform access to easily reach daily service points.

  • Swing-out doors on either side of the engine compartment provide easy access to critical daily service checks.

  • Optional tire pressure monitoring system provides real-time information to the operator in the cab for optimized tire life.

  • Electronics bay is conveniently located inside the cab.

  • Sight gauges offer quick visual inspection to minimize fluid contamination.

  • Lighting inside the engine compartment improves visibility to service points.

  • Ecology drains prevent spills and allow for easier service.

  • 500-hour engine oil and filter change interval with S•O•S oil sampling analysis.

  • Service center includes drain and fill, electronic technician connection, and fluid level status.

  • Axle oil cooler and Automatic Retarder Control prevents unnecessary wear from accelerating down declines.

Purpose-Built Cat Attachments

Built for Your Operation


  • Dependable blades are designed for mining with press rib construction and optimized widths and capacities for excellent dozing and rolling.

  • Available Cat coal blades retain load control and a large capacity for lighter materials.

  • Semi-U Blade features the increased capacity and spreading capabilities of a straight blade.

  • Heavy-Duty Semi-U blade includes a Hardox 400 Liner plate, side plates, and additional reinforcements at the bottom of the blade.

  • Equipped with the Cat MineStar System, a suite of integrated mine operations and mobile equipment technologies.

  • Cat MineStar’s capabilities help manage all aspects of operation.

  • Fleet provides remote machine tracking capabilities.

  • Terrain for Loading enables high precision management of load management.

  • Detect assists the operator with areas of limited visibility.

  • Health delivers machine condition and operating data and diagnostic tools for longer machine lifecycle.

Standard Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Operator Environment
    • Air conditioner and heater with automatic temperature control
    • Cab, sound-suppressed pressurized, protective structure (ROPS/FOPS), radio ready for (entertainment) includes antenna, speakers and converter (12V, 10-15 amp)
    • 12V power port for mobile phone or laptop connection
    • Cigar lighter and ashtray
    • Coat hook
    • Electro-hydraulic blade controls (joystick)
    • Flip-up armrest
    • Heater and defroster
    • Horn, electric
    • Instrumentation, gauges: - Engine coolant temperature - Fuel level - Ground speed - Gear - Hydraulic oil temperature - Speedometer/tachometer - Torque converter temperature
    • Instrumentation, warning indicators: - Action alert system, three category - Automatic transmission model enable status - Brake malfunction - Bucket float status - Delayed engine shutdown status - Engine idle shutdown status - Engine malfunction - Fuel economy mode enable status - Hydraulic lockout - Lockup clutch enable status - Low fuel level - Parking brake status - Rimpull control enable status - Seatbelt warning - Secondary steering (if equipped) - Throttle lock status - Transmission gear
    • Keypad, control with indicator lights: - Auto trans mode speed range - Auto/manual transmission mode - Lockup clutch - Reduced rimpull - Throttle lock
    • Light, dome (cab)
    • Lunchbox and beverage holders
    • Mirrors, rearview (externally mounted)
    • Seat, premium with heated and actively cooled leather, adjustable lumbar support, air adjustable bolsters on the seat and backrest, seat cushion tilt adjustment, and adjustable-length seat cushion
    • STIC control system with steering lock
    • Tinted glass
    • Wet-arm wipers/washers (front, rear and corner) intermittent front wiper
    • Converter (12V, 10/15 amp) and power port
  • Power Train
    • Brakes, oil cooled, multi-disc, service/secondary
    • Axle-shaft oil-disc service brake
    • Electro hydraulic parking brake
    • Cat clean emission module (Tier 4 only)
    • Demand fan
    • Engine Cat C27
    • Fuel priming pump (electric)
    • Ground level engine shutoff
    • Mufflers (under hood) (Tier 2 only)
    • Precleaner, engine air intake
    • Radiator, Aluminum Modular (AMR)
    • Separated cooling system
    • Starting aid, (ether) automatic
    • Throttle Lock electronic
    • Torque Converter, Impeller Clutch with lock-up clutch feature and rimpull control system
    • Transmission, 534 mm (21 in) planetary power shift (electronic) (3F/3R)
  • Electrical
    • Alternator, 150 amp
    • Batteries, maintenance free (4 - 1,400 CCA)
    • Deutsch terminal connectors
    • Electrical system, 24V
    • Electronic transmission control
    • Lighting system, halogen (front and rear) lighting, access stairway, engine compartment
    • Starting and charging system, 24V
    • Starter lockout in bumper
    • Starting receptacle for emergency start
    • Transmission lockout in bumper
  • Service
    • Vital Information Management System (VIMS) 3G with graphical information display: external data port, customizable operator profiles
    • Case drain filters
    • Coupling, Caterpillar O-ring face seals
    • Guards, crankcase and power train
    • Hitch, drawbar with pin
    • Hoses, Cat XT
    • Oil sampling valves
    • Product Link
  • Safety
    • Camera, rear vision
    • Implement lockout switch
    • Seat belt, retractable, 76 mm (3 in) wide
    • Trainer seat with lap belt
    • Alarm, back-up
    • Emergency platform egress
    • Stairway, left and right rear access
    • Steering, secondary
    • Toe kicks
  • Tramming
    • Fenders, steel (front)
  • Other
    • Axle temperature sensor
    • Battery disconnect and jump start receptacle, bumper
    • Economy mode with on demand throttle
    • Engine, crankcase, 500 hour interval with CH4
    • Engine idle management features: - Auto idle kickdown - Delayed engine shutdown - Engine idle shutdown
    • Grouped/labeled lube points
    • Positive flow control hydraulic system
    • Sight Gauges: hydraulic tanks, steering/fan and implement/brake, and transmission
    • Steering, load sensing
    • Vandalism protection caplocks
    • Premixed 50% concentration of extended life coolant with freeze protection to -34° C (-29° F)

Optional Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Power Train
    • 50° C (-58° F) antifreeze
    • Engine oil change system, high speed, Wiggins
    • Engine block heater 120V or 240V
    • High ambient cooling - software
  • Blades
    • Semi-U - 17.8 m3 (23.3 yd3)
    • HD Semi-U - 16.1 m3 (21.1 yd3)
    • Coal - 30.7 m3 (40.2 yd3)
  • Operator Environment
    • Cab precleaner
    • AM/FM/MP3 radio
    • Satellite Sirius radio with Bluetooth
    • LED warning strobe
    • CB radio ready
    • Window sun shade
  • Tramming
    • Front and rear roading fenders
  • Miscellaneous Attachments
    • Fast fill fuel system (Shaw-Aero)
    • Axle oscillation stop
    • Paint, black blade rear
  • Other
    • Venturi stack

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