844 Wheel Dozer
Maximize productivity in mining applications with the Cat® 844 Wheel Dozer, designed with efficiency in mind. Enhanced maintenance capabilities and simplified serviceability make for a long lifecycle, low owning and ...
Engine
- Engine Model
- Cat® C27
- Net Power - SAE J1349:2011 - Standard Ambient
- 732hp
- Rated Speed
- 1800r/min
- Emissions
- Option 1 - U.S. EPA Tier 4 Final / EU Stage V
- Engine Power - ISO 14396:2002
- 786hp
- Gross Power - SAE J1995:2014
- 801hp
- Net Power - SAE J1349:2011 - High Ambient
- 681hp
- Emissions
- Option 2 - China Nonroad Stage III emissions standards, equivalent to U.S. EPA Tier 2
- Engine Power - ISO 14396: 2002
- 752hp
- Gross Power - SAE J1995:2014
- 766hp
- Net Power - SAE J1349:2011 - Standard Ambient
- 699hp
- Net Power - SAE J1349:2011 - High Ambient
- 648hp
- Bore
- 5.4in
- Stroke
- 6in
- Displacement
- 1649.5in³
- Peak Torque - Speed
- 2624lb/ft
- Torque Rise
- 18%
- Note
- Net power advertised is the power available at the flywheel when the engine is equipped with fan at minimum speed, air intake system, exhaust system, and alternator.
Operating Specifications
- Operating Weight
- 165089lb
- Blade Capacity Range
- 20.8yd³
Transmission
- Transmission Type
- Cat Planetary Power Shift
- Converter Drive - Forward 1
- 4.5mile/h
- Converter Drive - Forward 2
- 8.3mile/h
- Converter Drive - Forward 3
- 14.2mile/h
- Converter Drive - Reverse 1
- 4.9mile/h
- Converter Drive - Reverse 2
- 9.1mile/h
- Converter Drive - Reverse 3
- 15.5mile/h
- Direct Drive - Forward 1
- Lock-up disabled
- Direct Drive - Forward 2
- 8.5mile/h
- Direct Drive - Forward 3
- 15.2mile/h
- Direct Drive - Reverse 1
- 5.4mile/h
- Direct Drive - Reverse 2
- 9.6mile/h
- Direct Drive - Reverse 3
- 16.4mile/h
- Note
- Travel speeds based on 45/65-45 L-5 46 ply tires.
Hydraulic System - Lift/Tilt
- Output at 2,000 rpm and 6900 kPa (1,000 psi)
- 82gal/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)
- 2700psi
- Relief Valve Setting - Tilt Cylinders (Small Pump)
- 2920psi
Hydraulic System - Steering
- Steering System - Circuit
- Pilot, load sensing
- Steering System - Pump
- Piston, variable displacement
- Minimum Turning Radius - Over Blade
- 34ft
- Total Steering Angle
- 35°
- Maximum Flow
- 94.3gal/min
- Relief Valve Setting
- 4500psi
Service Refill Capacities
- Fuel Tank - Standard
- 286.6gal (US)
- Cooling System
- 54.9gal (US)
- Crankcase
- 20gal (US)
- Transmission
- 29.1gal (US)
- Differential - Final Drives - Front
- 71.6gal (US)
- Differential - Final Drives - Rear
- 68.9gal (US)
- Hydraulic System - Implement and Hydraulic Fan
- 68.9gal (US)
- Hydraulic System - Steering and Braking
- 34.9gal (US)
Air Conditioning System
- Air Conditioning
- The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. - If equipped with R134a (Global Warming Potential = 1430), the system co
Axles
- Front
- Fixed
- Rear
- Trunnion
- Oscillation Angle
- 8.5°
Brakes
- Brakes
- Meets ISO 3540:2011
Sound Performance - Tier 4 Final / Stage V
- Operator Sound Pressure Level (ISO 6396:2008)
- 72dB(A)
- Machine Sound Power Level (ISO 6395:2008)
- 116dB(A)
- Operator Sound Pressure Level (ISO 6396:2008)*
- 72dB(A)
- Machine Sound Power Level (ISO 6395:2008)*
- 114dB(A)
- Note (1)
- *Sound suppression equipped
- Note (2)
- The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (3)
- The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (4)
- Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment.
Sound Performance - Tier 2
- Operator Sound Pressure Level (ISO 6396:2008)
- 72dB(A)
- Machine Sound Power Level (ISO 6395:2008)
- 116dB(A)
- Operator Sound Pressure Level (ISO 6396:2008)*
- 72dB(A)
- Machine Sound Power Level (ISO 6395:2008)*
- 114dB(A)
- Note (1)
- *Sound suppression equipped
- Note (2)
- The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (3)
- The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (4)
- Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment.
Cab
- ROPS/FOPS
- ISO 3471:2008 and ISO 3449:2005 Level II Standards
Dimensions (Approximate)
- Height - Top of ROPS
- 17.2ft
- Height - Top of Exhaust Pipe
- 16.6ft
- Height - Top of Hood
- 12.7ft
- Ground Clearance
- 2ft
- Centerline of Front Axle to Hitch
- 7.5ft
- Centerline of Rear Axle to Edge of Bumper
- 12.5ft
- Wheel Base
- 15.1ft
- Length - With Blade on Ground
- 36.5ft
Long Term Value and 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 help improve your bottom line.
- Resilient, durable blades are designed with excellent dozing and rolling characteristics.
- Optimized axle mounting helps result in increased structural integrity.
- Castings in the engine and frame are used in high stress areas to spread high loads.
- One-piece castings help enhance strength in key pin areas.
Move More with Less Fuel
- Experience reliable efficiency with complete control over injection timing, duration, and pressure with Mechanically Actuated Electronic Unit Injection (MEUI™).
- World-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) help 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 helps protect investment and helps lengthen lifecycle.
Safety First
- 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) help increase operator awareness around the machine.
- Cab-mounted LED strobes provide warning for others near the machine.
- Wider stairs with reduced stair angles help increase safety for operators.
- Access stairs via a powered platform from cab or ground level and have emergency exit access.
Technology that Gets Work Done
- Integrated technologies assist with monitoring, managing, and enhancing your jobsite operations.
- Product Link™ remote monitoring helps provide 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™) 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 help enhance awareness of the environment around the machine for increased safety.
Work In Comfort
- Steering and Transmission Integrated Control System (STIC™) combines directional selection, gear selection, and steering into a single lever, helping to maximize 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 help keep operators comfortable throughout their entire shift.
Reduce Environmental Impact
- Meets U.S. EPA Tier 4 Final emissions standards or equivalent to U.S. EPA Tier 2.
- Automatic Engine Idle Shutdown helps conserve 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
- 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 help 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 help minimize fluid contamination.
- Lighting inside the engine compartment helps improve visibility to service points.
- Ecology drains help 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 helps prevent unnecessary wear from accelerating down declines.
Purpose-Built Cat Attachments
- Dependable blades are designed for mining with press rib construction and optimized widths and capacities for excellent dozing and rolling.
- 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 helps enable 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 a long machine lifecycle.