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844 Wheel Dozer
Engine Model
Cat® C27
Operating Weight
165,089 lb
74,883 kg
Net Power - SAE J1349:2011 - Standard Ambient
732 hp
546 kW
SPECIFICATIONS
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.
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).
Axles
Front
Fixed
Rear
Trunnion
Oscillation Angle
8.5 °
8.5 °
Brakes
Brakes
Meets ISO 3540:2011
Cab
ROPS/FOPS
ISO 3471:2008 and ISO 3449:2005 Level II Standards
Dimensions (Approximate)
Height - Top of ROPS
17.2 ft
5,240 mm
Height - Top of Exhaust Pipe
16.6 ft
5,049 mm
Height - Top of Hood
12.7 ft
3,862 mm
Ground Clearance
2 ft
596 mm
Centerline of Front Axle to Hitch
7.5 ft
2,300 mm
Centerline of Rear Axle to Edge of Bumper
12.5 ft
3,795 mm
Wheel Base
15.1 ft
4,600 mm
Length - With Blade on Ground
36.5 ft
11,120 mm
Engine
Engine Model
Cat® C27
Net Power - SAE J1349:2011 - Standard Ambient
732 hp
546 kW
Rated Speed
1,800 r/min
1,800 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 in
152.4 mm
Displacement
1,649.5 in³
27.03 l
Peak Torque - Speed
2,624 lb/ft
3,557 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.
Hydraulic System - Lift/Tilt
Output at 2,000 rpm and 6900 kPa (1,000 psi)
82 gpm
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)
2,700 psi
18,650 kPa
Relief Valve Setting - Tilt Cylinders (Small Pump)
2,920 psi
20,150 kPa
Hydraulic System - Steering
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Minimum Turning Radius - Over Blade
34 ft
10,369 mm
Total Steering Angle
35 °
35 °
Maximum Flow
94.3 gpm
357 L/min
Relief Valve Setting
4,500 psi
31,000 kPa
Operating Specifications
Operating Weight
165,089 lb
74,883 kg
Blade Capacity Range
20.8 yd³
15.9 m³
Service Refill Capacities
Fuel Tank - Standard
286.6 gal (US)
1,085 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
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.
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.
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.
- 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
- 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
WHY CHOOSE EMPIRE
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