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.
Features
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Long Term Value and Durability
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Move More with Less Fuel
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Safety First
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Technology that Gets Work Done
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Work In Comfort
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Reduce Environmental Impact
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Save on Service and Maintenance
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Purpose-Built Cat Attachments
Specifications
Units for specifications
Engine
| Engine Model | Cat® C27 |
|---|---|
| Net Power - SAE J1349:2011 - Standard Ambient | 732 hp 546 kW |
| Rated Speed | 1800 r/min 1800 r/min |
| Emissions | Option 1 - U.S. EPA Tier 4 Final / EU Stage V |
| Engine Power - ISO 14396:2002 | 786 hp 586 kW |
| Gross Power - SAE J1995:2014 | 801 hp 597 kW |
| Net Power - SAE J1349:2011 - High Ambient | 681 hp 508 kW |
| Emissions | Option 2 - China Nonroad Stage III emissions standards, equivalent to U.S. EPA Tier 2 |
| Engine Power - ISO 14396: 2002 | 752 hp 561 kW |
| Gross Power - SAE J1995:2014 | 766 hp 571 kW |
| Net Power - SAE J1349:2011 - Standard Ambient | 699 hp 521 kW |
| Net Power - SAE J1349:2011 - High Ambient | 648 hp 483 kW |
| Bore | 5.4 in 137.2 mm |
| Stroke | 6.0 in 152.4 mm |
| Displacement | 1649.5 in³ 27.03 l |
| Peak Torque - Speed | 2624 lb/ft 3557 N·m |
| Torque Rise | 18 % 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 | 165089 lb 74883 kg |
|---|---|
| Blade Capacity Range | 20.8 yd³ 15.9 m³ |
Transmission
| Transmission Type | Cat Planetary Power Shift |
|---|---|
| Converter Drive - Forward 1 | 4.5 mile/h 7.3 km/h |
| Converter Drive - Forward 2 | 8.3 mile/h 13.3 km/h |
| Converter Drive - Forward 3 | 14.2 mile/h 22.9 km/h |
| Converter Drive - Reverse 1 | 4.9 mile/h 7.9 km/h |
| Converter Drive - Reverse 2 | 9.1 mile/h 14.7 km/h |
| Converter Drive - Reverse 3 | 15.5 mile/h 24.9 km/h |
| Direct Drive - Forward 1 | Lock-up disabled |
| Direct Drive - Forward 2 | 8.5 mile/h 13.7 km/h |
| Direct Drive - Forward 3 | 15.2 mile/h 24.5 km/h |
| Direct Drive - Reverse 1 | 5.4 mile/h 8.7 km/h |
| Direct Drive - Reverse 2 | 9.6 mile/h 15.4 km/h |
| Direct Drive - Reverse 3 | 16.4 mile/h 26.4 km/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) | 82 gal/min 311 l/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 18650 kPa |
| Relief Valve Setting - Tilt Cylinders (Small Pump) | 2920 psi 20150 kPa |
Hydraulic System - Steering
| Steering System - Circuit | Pilot, load sensing |
|---|---|
| Steering System - Pump | Piston, variable displacement |
| Minimum Turning Radius - Over Blade | 34.0 ft 10369 mm |
| Total Steering Angle | 35 ° 35 ° |
| Maximum Flow | 94.3 gal/min 357 l/min |
| Relief Valve Setting | 4500 psi 31000 kPa |
Service Refill Capacities
| Fuel Tank - Standard | 286.6 gal (US) 1085 l |
|---|---|
| Cooling System | 54.9 gal (US) 208 l |
| Crankcase | 20 gal (US) 76 l |
| Transmission | 29.1 gal (US) 110 l |
| Differential - Final Drives - Front | 71.6 gal (US) 271 l |
| Differential - Final Drives - Rear | 68.9 gal (US) 261 l |
| Hydraulic System - Implement and Hydraulic Fan | 68.9 gal (US) 261 l |
| Hydraulic System - Steering and Braking | 34.9 gal (US) 132 l |
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 contains 1.8 kg (3.9 lb) of refrigerant, which has a CO2 equivalent of 2.574 metric tonnes (2.837 tons). |
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Axles
| Front | Fixed |
|---|---|
| Rear | Trunnion |
| Oscillation Angle | 8.5 ° 8.5 ° |
Brakes
| Brakes | Meets ISO 3540:2011 |
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Sound Performance - Tier 4 Final / Stage V
| Operator Sound Pressure Level (ISO 6396:2008) | 72 dB(A) 72 dB(A) |
|---|---|
| Machine Sound Power Level (ISO 6395:2008) | 116 dB(A) 116 dB(A) |
| Operator Sound Pressure Level (ISO 6396:2008)* | 72 dB(A) 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008)* | 114 dB(A) 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
| Operator Sound Pressure Level (ISO 6396:2008) | 72 dB(A) 72 dB(A) |
|---|---|
| Machine Sound Power Level (ISO 6395:2008) | 116 dB(A) 116 dB(A) |
| Operator Sound Pressure Level (ISO 6396:2008)* | 72 dB(A) 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008)* | 114 dB(A) 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
| ROPS/FOPS | ISO 3471:2008 and ISO 3449:2005 Level II Standards |
|---|
Dimensions (Approximate)
| Height - Top of ROPS | 17.2 ft 5240 mm |
|---|---|
| Height - Top of Exhaust Pipe | 16.6 ft 5049 mm |
| Height - Top of Hood | 12.7 ft 3862 mm |
| Ground Clearance | 2.0 ft 596 mm |
| Centerline of Front Axle to Hitch | 7.5 ft 2300 mm |
| Centerline of Rear Axle to Edge of Bumper | 12.5 ft 3795 mm |
| Wheel Base | 15.1 ft 4600 mm |
| Length - With Blade on Ground | 36.5 ft 11120 mm |
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