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Caterpillar
844 Wheel Dozer
Engine Model
Cat® C27
Cat® C27
Operating Weight
165089 lb
74883 kg
Net Power – SAE J1349:2011 – Standard Ambient
732 hp
546 kW
Overview
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.
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Exterior
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Interior
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Details
Specifications
Engine
| Spec | Value |
|---|---|
| Engine Model | Cat® C27 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 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 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 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. 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 74883 kg |
| Blade Capacity Range | 20.8 yd³ 15.9 m³ |
Transmission
| Spec | Value |
|---|---|
| Transmission Type | Cat Planetary Power Shift 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 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. 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 311 l/min |
| Cylinders, Double Acting – Lift, Bore and Stroke | 133 mm × 1535 mm (5.25 in × 60.4 in) 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) 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
| Spec | Value |
|---|---|
| Steering System – Circuit | Pilot, load sensing Pilot, load sensing |
| Steering System – Pump | Piston, variable displacement Piston, variable displacement |
| Minimum Turning Radius – Over Blade | 34 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
| Spec | Value |
|---|---|
| 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
| 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). 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 Fixed |
| Rear | Trunnion Trunnion |
| Oscillation Angle | 8.5 ° 8.5 ° |
Brakes
| Spec | Value |
|---|---|
| Brakes | Meets ISO 3540:2011 Meets ISO 3540:2011 |
Sound Performance - Tier 4 Final / Stage V
| Spec | Value |
|---|---|
| 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 *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. 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. 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. 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) 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 *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. 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. 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. 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 ISO 3471:2008 and ISO 3449:2005 Level II Standards |
Dimensions (Approximate)
| Spec | Value |
|---|---|
| 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 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