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 operating costs, and more uptime. Move more material with a machine built for the toughest conditions.
Caterpillar
844 Wheel Dozer
Overview
Photos
-
844 Wheel Dozer -
844 Wheel Dozer -
844 Wheel Dozer -
844 Wheel Dozer -
844 Wheel Dozer -
844 Wheel Dozer
360° View
Exterior
360° Exterior view. Double click on the image to zoom in on any area of the product.
Interior
360° interior view. Double click on the image to zoom in on any area of the product.
Specifications
-
Engine
Spec Value Engine Model Cat® C27 Net Power - SAE J1349:2011 - Standard Ambient 732 hp Rated Speed 1800 r/min Emissions Option 1 - U.S. EPA Tier 4 Final / EU Stage V Engine Power - ISO 14396:2002 786 hp Gross Power - SAE J1995:2014 801 hp Net Power - SAE J1349:2011 - High Ambient 681 hp Emissions Option 2 - China Nonroad Stage III emissions standards, equivalent to U.S. EPA Tier 2 Engine Power - ISO 14396: 2002 752 hp Gross Power - SAE J1995:2014 766 hp Net Power - SAE J1349:2011 - Standard Ambient 699 hp Net Power - SAE J1349:2011 - High Ambient 648 hp Bore 5.4 in Stroke 6 in Displacement 1649.5 in³ Peak Torque - Speed 2624 lb/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
Spec Value Operating Weight 165089 lb Blade Capacity Range 20.8 yd³ -
Transmission
Spec Value 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 Note Travel speeds based on 45/65-45 L-5 46 ply tires. -
Hydraulic System - Lift/Tilt
Spec Value 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
Spec Value 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
Spec Value 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
Spec Value 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 contains 1.8 kg (3.9 lb) of refrigerant, which has a CO2 equivalent of 2.574 metric tonnes (2.837 tons). -
Axles
Spec Value Front Fixed Rear Trunnion Oscillation Angle 8.5 ° -
Brakes
Spec Value Brakes Meets ISO 3540:2011 -
Sound Performance - Tier 4 Final / Stage V
Spec Value Operator Sound Pressure Level (ISO 6396:2008) 72 dB(A) Machine Sound Power Level (ISO 6395:2008) 116 dB(A) Operator Sound Pressure Level (ISO 6396:2008)* 72 dB(A) Machine Sound Power Level (ISO 6395:2008)* 114 dB(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
Spec Value Operator Sound Pressure Level (ISO 6396:2008) 72 dB(A) Machine Sound Power Level (ISO 6395:2008) 116 dB(A) Operator Sound Pressure Level (ISO 6396:2008)* 72 dB(A) Machine Sound Power Level (ISO 6395:2008)* 114 dB(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
Spec Value ROPS/FOPS ISO 3471:2008 and ISO 3449:2005 Level II Standards -
Dimensions (Approximate)
Spec Value 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
Standard Equipment
NOTE
- Standard and optional equipment may vary. Consult your Cat dealer for details.
ELECTRICAL AND LIGHTING
- Alternator, 150 amp
- Batteries, maintenance free (4 - 1,400 CCA)
- Battery disconnect and jump start receptacle, bumper
- Deutsch terminal connectors
- Electrical system, 24V
- Electronic transmission control
- Lighting system, halogen (front and rear) lighting, access stairway, engine compartment
- Starter lockout in bumper
- Starting and charging system, 24V
- Transmission lockout in bumper
POWERTRAIN
- Brakes, oil cooled, multi-disc, service/secondary
- Driveline parking brake
- Engine Cat C27
- Fuel priming pump (electric)
- Ground level engine shutdown switch
- Precleaner, engine air intake (above hood)
- Radiator, Aluminum Modular (AMR)
- Starting aid, (ether) automatic
- Throttle Lock electronic
- Torque Converter, Impeller clutch with lock-up clutch (ICTC) and rimpull control system
- Transmission, 534 mm (21 in) planetary power shift (electronic) (3F/3R)
OPERATOR ENVIRONMENT
- Advisor display, displays real time operating information, performs calibrations and customizes operator setting
- Air conditioner and heater with automatic temperature control
- Air precleaner, powered
- Cab, sound-suppressed pressurized, separate external rolloever protective structure/falling objects protective structure (ROPS/FOPS)
- Cigar lighter and ashtray
- Coat hook
- Converter (12V, 10/15 amp) and power port
- Electro-hydraulic blade controls (joystick)
- Heater and defroster
- Horn, electric
- Instrumentation, gauges: - engine coolant temperature, fuel level, hydraulic oil temperature, powertrain oil temperature, tachometer
- 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
- Light, dome (cab)
- Lunchbox and beverage holders
- 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
- Radio, AM/FM with Bluetooth®, USB Port, 3.5 mm AUX input
- Tinted glass
- Wet-arm wipers/washers (front, rear and corner) intermittent front wiper
SAFETY
- Alarm, back-up
- Camera, rear vision
- Emergency platform exit
- Implement lockout switch
- Mirrors, rearview (externally mounted)
- Seat belt, retractable, 76 mm (3 in) wide
- Stairway, left and right rear access
- Steering and transmission lock lever, cab
- Steering, secondary
- Seat, trainer with lap belt, 76 mm (3in) wide
- Toe kicks
SERVICE
- Axle ecology drains
- Case drain filters
- Coupling, Caterpillar O-ring face seals
- Engine, crankcase, 500 hour interval with CH4
- Front walkway around cab
- Guards, crankcase and powertrain
- Grouped/labeled lube points
- Battery disconnect and jump start receptacle, bumper
- Hitch, drawbar with pin
- Hoses, Cat XT™
- Oil sampling valves
- Sight guages for steering, implement and transmission oil
- Vital Information Management System (VIMS) 3G with graphical information display: external data port, customizable operator profiles
COOLING
- Standard ambient package (recommended for site conditions that do not exceed 43°C (110°F)
COLD WEATHER
- Heated seat
EFFICIENCY
- Economy mode with on demand throttle
- Positive flow control hydraulic system
- Impeller Clutch Torque Converter (ICTC) with lock-up clutch
- Steering, load sensing
- Soft detent controls
- Engine idle management features: - Auto idle kickdown - Delayed engine shutdown - Engine idle shutdown
TRAMMING
- Front fenders
Optional Equipment
NOTE
- Standard and optional equipment may vary. Consult your Cat dealer for details.
ELECTRICAL AND LIGHTING
- Lights, LED
- Product Link (Cellular)
- Product Link (Satellite)
POWERTRAIN
- Engine brake
- No-spin rear axle
- No-spin rear axle and oil cooler
- Precleaner, raised
OPERATOR ENVIRONMENT
- Radio, Sirius XM/AM/FM radio with Bluetooth technology, USB port, 3.5 mm AUX input
- Rubber mounted cab glass
- Window sun screen
SAFETY
- LED warning strobe
SERVICE
- Product Link™
BLADES
- HD Semi-U - 16.1 m3 (21.1 yd3)
- Paint, black blade rear
COOLING
- High ambient cooling - software (recommended for site conditions that do not exceed 49°C [121°F]
COLD WEATHER
- 50° C (-58° F) antifreeze
- 120V or 240V coolant heating elements (recommended in conditions from -18°C to -30°C [0°F to -22°F]
- -40°C (-40°F) Hydraulic Oil, Arctic
TRAMMING
- Fender extensions, roading, front and rear